CN105891015B - Box-type sampling shear strength testing device - Google Patents
Box-type sampling shear strength testing device Download PDFInfo
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- CN105891015B CN105891015B CN201610399250.6A CN201610399250A CN105891015B CN 105891015 B CN105891015 B CN 105891015B CN 201610399250 A CN201610399250 A CN 201610399250A CN 105891015 B CN105891015 B CN 105891015B
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- 238000012360 testing method Methods 0.000 title claims abstract description 126
- 238000005070 sampling Methods 0.000 title claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 82
- 239000004927 clay Substances 0.000 claims abstract description 48
- 238000010008 shearing Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 25
- 239000002689 soil Substances 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 6
- 238000013100 final test Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
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- 238000011065 in-situ storage Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The utility model discloses a box-type sampling shear strength testing device, which is provided with an equipment bracket, a driving mechanism, a positioning mechanism and a control mechanism; the equipment support is provided with a cavity for accommodating a box type sampler to be tested, and the upper surface of the equipment support is provided with a positioning mechanism; the driving mechanism is arranged on the positioning mechanism and provided with a cross plate testing component, and the cross plate testing component is arranged to be inserted into the clay to be tested and measure the shearing strength of the clay; the control mechanism is provided with a control circuit and is set to output a starting test instruction to the driving mechanism and read the rotation angle value and the corresponding torque value of the cross plate test assembly in real time; the invention relates to but is not limited to clay test equipment, the defects in the prior art can be effectively overcome by applying the invention, the shear strength test of the weak clay with high water content can be realized, and the precision of the final test result can be effectively ensured.
Description
Technical Field
The application relates to but is not limited to clay test equipment, in particular to a box type sampling shear strength test device.
Background
In the prior art, a cross plate shear test is a test for measuring the non-drainage shear strength and sensitivity of saturated soft cohesive soil by using a cross plate, and belongs to one of undisturbed strength tests; specifically, the cross plate head is pressed into soft soil at the bottom of a hole from a drill hole, rotates at a uniform speed, and measures torque required by rotation of the cross plate head through a certain measuring system until a soil body is damaged, so that the shearing strength of unearthed soil is calculated. In the above-mentioned specific test process, the cohesive soil to be tested needs to provide sufficient supporting counter-force to ensure that the test is carried out smoothly.
At present, in the deep sea environment, shallow soil layers are all soft clay with high water content, and the shear strength of the clay is an important mechanical index needing to be determined in deep geotechnical engineering investigation. However, during the above-mentioned specific test of shear strength, the shear strength of the shallow weak clay is not sufficient to provide a sufficient supporting counter force for the test equipment of the conventional in-situ cross-plate shear test; therefore, the cross plate shearing experimental equipment in the prior art cannot realize the shear strength measurement of the shallow soil layer.
Based on this, the person skilled in the art also tries to measure the above-mentioned high-water content weak clay by other means; specifically, a certain pipe column of clay to be measured is sleeved from a box-type sampler through a plastic pipe, the clay is limited through the pipe wall of the plastic pipe so as to avoid large-scale flow, and the shear strength of the clay to be measured is measured in the plastic pipe; the above test procedure has the following disadvantages: the test is a manual point-by-point test, and only the peak value of the shear strength can be recorded, and the continuous tracking test cannot be realized; the test is a vertical directional test, horizontal positioning cannot be realized, multi-point test on the same plane cannot be realized, and the error of the test result is large; the tubular column sampling operation of the plastic pipe relates to secondary sampling operation, has large disturbance on the clay to be tested, and influences the accuracy of a final test result.
Disclosure of Invention
The technical problem that this application was solved provides a box sample shear strength testing arrangement, can effectively overcome the defect that exists among the prior art, can realize the shear strength test of the weak clay of high water content, can effectively guarantee the precision of final test result.
In order to solve the technical problem, the application provides a box-type sampling shear strength testing device which is provided with an equipment bracket, a driving mechanism, a positioning mechanism and a control mechanism; wherein,
the equipment support is provided with a cavity for accommodating a box type sampler to be tested, and the upper surface of the equipment support is provided with a positioning mechanism;
the driving mechanism is arranged on the positioning mechanism and provided with a cross plate testing component, and the cross plate testing component is arranged to be inserted into the clay to be tested and measure the shearing strength of the clay;
the positioning mechanism is provided with a horizontal positioning structure and a vertical positioning structure, and the horizontal positioning structure is arranged to realize the horizontal positioning of the cross plate testing component in the box type sampler to be tested; the vertical positioning structure is arranged to realize vertical positioning of the cross plate testing component in the box type sampler to be tested;
the control mechanism is provided with a control circuit and is set to output a starting test instruction to the driving mechanism and read the rotation angle value and the corresponding torque value of the cross plate test assembly in real time.
The box-type sampling shear strength testing device also has the following characteristics,
the equipment support is arranged into a steel frame structure, the positioning mechanism is arranged on the upper surface of the steel frame structure, and a middle cavity of the steel frame structure is arranged to accommodate a box type sampler to be tested; in the testing process, the driving mechanism is set to enter the box type sampler to be tested placed in the middle cavity along the upper surface of the steel frame structure through the positioning mechanism.
The box-type sampling shear strength testing device also has the following characteristics,
the equipment support is provided with a leveling structure, the leveling structure is set to be a leveling bolt, and the leveling structure is arranged at the bottom of the steel frame structure.
The box-type sampling shear strength testing device also has the following characteristics,
the driving mechanism is provided with a driving motor, and the cross plate testing assembly is provided with a connecting rod and a cross plate; the top end of the connecting rod is connected with the output shaft end of the driving motor, and the bottom end of the connecting rod is connected with the cross plate; the positive rotation of the driving motor is set to test the undisturbed shear strength and the disturbance strength of the clay, and the positive rotation and the negative rotation of the driving motor are set to disturb the clay to be tested and obtain a disturbed soil sample.
The box-type sampling shear strength testing device also has the following characteristics,
the driving motor is arranged to be installed in a vertical positioning structure of the positioning mechanism and is arranged to drive the cross plate testing assembly to perform positioning operation along with the positioning mechanism.
The box-type sampling shear strength testing device also has the following characteristics,
the cross plate testing assembly is provided with a sensor which is arranged to detect a torque value borne by the cross plate in real time and transmit the torque value to the control circuit; the control circuit is configured to receive and store the detected torque value of the sensor and display the detected torque value on a display connected to the control circuit.
The box-type sampling shear strength testing device also has the following characteristics,
the horizontal positioning structure is provided with a first guide rail group and a second guide rail group which are perpendicular to each other, the first guide rail group is arranged on the upper surface of the equipment support, the second guide rail group is arranged above the first guide rail group, and the first guide rail group and the second guide rail group are both provided with two monorail arranged in parallel;
the lower surface of the second guide rail group is provided with a first sliding groove which is arranged for sleeving and installing the first guide rail group and guiding the second guide rail group to slide along the first guide rail group;
a support plate is arranged on the upper surface of the second guide rail group and is used for connecting and supporting the vertical positioning structure; the lower surface of the supporting plate is provided with a second sliding groove, and the second sliding groove is provided with the second guide rail group in a sleeved mode, is used for guiding the supporting plate and slides along the second guide rail group;
the side surfaces of the first sliding groove and the second sliding groove are provided with locking nuts, and the locking nuts are screwed up to fix the second guide rail group and the horizontal position of the supporting plate.
The box-type sampling shear strength testing device also has the following characteristics,
the vertical positioning structure is provided with a third guide rail group and a positioning disc, a gear structure is arranged at a rotating shaft of the positioning disc, and the third guide rail group is correspondingly provided with a rack structure; the rotating action of the positioning disc is set to be matched with the rack and pinion to realize the vertical sliding action along the third guide rail group;
a sliding sleeve is arranged between the positioning disc and the third guide rail group; the sliding sleeve is arranged to be sleeved outside the third guide rail group, is connected with the positioning disc, limits the positioning disc to be separated from the third guide rail group, and vertically slides along with the positioning disc;
the outer side of the sliding sleeve is also connected with a motor supporting plate which is set as a driving motor for mounting the driving mechanism; the third guide rail group is further provided with a numerical scale, the vertical scale is arranged on one side of the driving motor, and the vertical scale is arranged for observing the descending distance of the driving mechanism.
The above technical scheme of this application has following beneficial effect:
the technical scheme provided by the invention can effectively overcome the defect that the non-drainage shear strength of deep-water shallow-layer weak clay cannot be directly tested by a land conventional cross plate shearing device; the box-type sampler is directly arranged at the bottom of the device, so that the soft clay to be tested in the box can be directly tested, the step of 'secondary sampling' by using a sampling tube in the conventional cross plate shear strength testing method can be effectively avoided, the disturbance of a soil sample is reduced, and the mechanical state of the soft clay in the seabed can be reflected more truly by the testing result; the change process of the strength of the weak clay along with the corner is displayed in real time through a corner-strength curve graph, so that the test result is more visual, a continuous change process can be obtained, and comprehensive data are provided for later monitoring and analysis.
In addition, besides the shear strength test of ocean deep water, the method can also be used for carrying out the sensitivity and thixotropy test of weak clay, and can effectively improve the application universality of the method: after the undisturbed strength test is completed, the motor is controlled to rotate at a constant speed to completely disturb the soft clay, and the corresponding disturbing strength is carried out, so that the defects of large discreteness of test data and unobtrusive test results caused by manual disturbance of the soil sample can be effectively overcome.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the embodiments of the invention. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a first schematic structural diagram according to an embodiment of the present invention;
FIG. 2 is a second schematic structural diagram according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram according to an embodiment of the present invention;
FIG. 4 is a graph illustrating the variation of shear stress with rotation angle according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in connection with figures 1, 2 and 3,
the embodiment of the invention provides a box-type sampling shear strength testing device which can be provided with an equipment bracket 1, a driving mechanism, a positioning mechanism and a control mechanism; wherein, the equipment bracket 1 is provided with a cavity for accommodating the box-type sampler 3 to be tested, and the upper surface of the equipment bracket 1 is provided with a positioning mechanism; the driving mechanism is arranged on the positioning mechanism and is provided with a cross plate testing component, and the cross plate testing component is arranged to be inserted into the clay to be tested and measure the shearing strength of the clay; the positioning mechanism is provided with a horizontal positioning structure and a vertical positioning structure, and the horizontal positioning structure is arranged to realize the horizontal positioning of the cross plate testing component in the box type sampler 3 to be tested; the vertical positioning structure is arranged to realize the vertical positioning of the cross plate testing component in the box type sampler 3 to be tested; the control mechanism is provided with a control circuit and is set to output a starting test instruction to the driving mechanism and read the rotation angle value and the corresponding torque value of the cross plate test assembly in real time.
In the specific operation, the control mechanism can control the driving mechanism arranged on the positioning mechanism to start and carry out the shear strength test of the corresponding clay; in the testing process of the cross plate testing assembly, the control circuit uploads a torque value and simultaneously acquires corresponding rotation angles of a control driving mechanism of the cross plate testing assembly; the rotation angle value and the torque value are obtained through a control circuit, a corresponding curve is generated, and the shear strength test is finally completed; the test curve finally obtained by the technical scheme is a continuous curve, so that the continuous change value of the clay performance from the initial test stage to the peak test stage can be effectively reflected, and fully perfect data can be provided for the later clay performance processing analysis; according to the technical scheme, the final test operation can be completed only by once sampling, namely the sampling operation of the box-type sampler; disturbance caused by secondary sampling in the prior art can be effectively avoided; the method is well suitable for the soft clay with high water content, and can realize final accurate test operation.
In order to optimize the corresponding equipment support 1, the equipment support 1 in the above scheme of the invention can be set to be a steel frame structure, the upper surface of the steel frame structure is set to be a placing and positioning mechanism, and the middle cavity of the steel frame structure is set to accommodate the box-type sampler 3 to be tested; in the test process, the driving mechanism is arranged to enter the box-type sampler 3 to be tested, which is placed in the middle cavity, along the upper surface of the steel frame structure through the positioning mechanism. Preferably, the equipment support 1 can be further provided with a leveling structure 2, the leveling structure 2 is provided as a leveling bolt, and the leveling structure 2 is provided at the bottom of the steel frame structure.
In the specific operation, a box-type sampler 3 to be tested can be placed through a middle cavity preset in the steel frame structure, and then a driving mechanism enters the box-type sampler 3 to be tested through the upper part of the cavity so as to carry out corresponding test operation; after the test is finished, the driving mechanism is returned to the initial position, and the box-type sampler is withdrawn to the outer side of the middle cavity; in addition, the position of the equipment support 1 can be adjusted through the leveling bolt, the driving mechanism arranged above the equipment support can be effectively ensured to be in a vertical state, and the accuracy of final testing can be effectively ensured.
In order to optimize the corresponding driving mechanism, the driving mechanism in the scheme of the invention is provided with a driving motor 9, and a cross plate testing component is provided with a connecting rod and a cross plate 11; wherein, the top end of the connecting rod is arranged to be connected with the output shaft end of the driving motor 9, and the bottom end of the connecting rod is arranged to be connected with the cross plate; the positive rotation of the driving motor 9 is set to test the undisturbed shear strength and disturbance strength of the clay, and the positive rotation and the negative rotation of the driving motor 9 are set to disturb the clay to be tested and obtain a disturbed soil sample. Preferably, the driving motor 9 is arranged to be mounted in a vertical positioning structure of the positioning mechanism and arranged to drive the cross plate testing assembly to perform positioning operation along with the positioning mechanism. Preferably, the cross plate testing component is provided with a sensor, and the sensor is set to detect the torque value borne by the cross plate in real time and transmit the torque value to the control circuit; the control circuit is configured to receive the detected torque value of the storage sensor and display the detected torque value on a display connected to the control circuit. Wherein, the sensor can be arranged at the top end of the connecting rod, as shown at 10; correspondingly, the cross plate can also be arranged at the bottom end of the connecting rod, and the specific arrangement position is based on the detection of the received torque of the cross plate.
In the specific operation, the control circuit can control the driving motor 9 to rotate forward and start, and the connecting rod drives the cross plate to rotate together; and in the rotation process of the cross plate in the clay, completing corresponding shearing strength test operation. When the disturbance intensity of the disturbed soil sample of the clay needs to be tested, the control circuit controls the driving motor 9 to rotate forward and start and disturb the soil sample, and after the disturbance in the direction is completed; controlling the driving motor 9 to rotate reversely, and disturbing the soil sample in the other direction, wherein after the disturbance in the direction is completed, the disturbed soil sample has the condition of measuring disturbance intensity; the subsequent measurement operation is the same as the step of measuring the shear strength, and finally the disturbance strength of the soil sample can be obtained.
In order to optimize the corresponding positioning mechanism, the horizontal positioning structure in the above-mentioned scheme of the present invention may be provided with a first guide rail group and a second guide rail group 4 perpendicular to each other, the first guide rail group is disposed on the upper surface of the equipment support 1, the second guide rail group 4 is disposed above the first guide rail group, and both the first guide rail group and the second guide rail group 4 are provided with two monorail arranged in parallel; the lower surface of the second guide rail group 4 is provided with a first sliding chute which is arranged to be sleeved with the first guide rail group and is arranged to guide the second guide rail group 4 to slide along the first guide rail group; a support plate 5 is arranged on the upper surface of the second guide rail group 4, and the support plate 5 is arranged to be connected with and support a vertical positioning structure; the lower surface of the supporting plate 5 is provided with a second sliding groove, the second sliding groove is provided with a second guide rail group 4 in a sleeved mode, the second sliding groove is provided with a guide supporting plate 5, and the guide supporting plate slides along the second guide rail group 4.
In the specific operation, the positioning of any point of the horizontal plane of the clay to be detected can be realized through the matched sliding of the first guide rail group and the second guide rail group 4; simultaneously, above-mentioned guide rail is preferred to be set up to SBR guide rail structure, can effectively avoid sinking into the positioning error or the slope etc. that arouse in getting into the slide rail among the test procedure. The positioning in the sliding direction can be realized by the sliding of the support plate 5 on the second guide rail group 4; the positioning in the sliding direction can be realized by the sliding of the second guide rail group 4 on the first guide rail group; based on the above, the arbitrary point positioning of the horizontal plane can be realized.
Preferably, the side surfaces of the first sliding chute and the second sliding chute may be provided with a locking nut, and the locking nut is tightened to fix the horizontal positions of the second guide rail set 4 and the support plate 5. In the specific operation, after the horizontal position of the horizontal positioning structure is determined by the first guide rail group and the second guide rail group 4, the locking nuts at the two positions can be locked, so that the locking of the current horizontal position is realized, and the deviation error of the horizontal positioning result is limited in the test process; the stability of test process can effectively be guaranteed in above-mentioned lock nut's setting.
Correspondingly, the vertical positioning structure can also be provided with a third guide rail group 6 and a positioning disc 7, a gear structure is arranged at the rotating shaft of the positioning disc 7, and the third guide rail group 6 is correspondingly provided with a rack structure; the positioning disc 7 rotates and is matched with the rack and pinion to realize vertical sliding motion along the third guide rail group 6; a sliding sleeve 13 is arranged between the positioning disc 7 and the third guide rail group 6; the sliding sleeve 13 is arranged to be sleeved outside the third guide rail group 6, is connected with the positioning disc 7, limits the positioning disc 7 to be separated from the third guide rail group 6, and vertically slides along with the positioning disc 7; the outside of sliding sleeve still is connected with the motor layer board, and the motor layer board sets up to installation actuating mechanism's driving motor 9.
In the specific operation, the positioning disc 7 can rotate, and the descending operation of the positioning disc 7 along the third guide rail group 6 is realized through the matching of the sliding sleeve and the gear rack structure; it should be noted that the vertical positioning structure may also select a structural form of the ball screw pair, and the positioning operation in the vertical direction can also be achieved, and the specific principle is not described herein again. Preferably, the positioning disk 7 is provided with indexing holes 12 at equal intervals along the circumferential direction for controlling the number of revolutions of the positioning disk 7. According to the technical scheme, the vertical positioning structure is meshed with the toothed structure through the gear, so that the lifting operation of the vertical positioning structure is controlled; and the three-dimensional positioning system is formed together with the horizontal positioning structure, so that the three-dimensional positioning of the measuring position is realized.
Preferably, in the above vertical positioning structure, the third guide rail set 6 is further provided with a numerical scale, the vertical scale is arranged on one side of the driving motor 9, and the vertical scale is arranged to observe the descending distance of the driving mechanism; the edge of the positioning disc 7 is provided with 25 openings which are matched with the number of teeth of the gear, and the purpose is to intuitively embody the rotation operation of the gear at the rotating shaft through the rotation of the openings; wherein the vertical positioning distance between two adjacent holes is 3 mm; that is, the drive mechanism is raised or lowered 3mm as the pilot disc 7 rotates the pilot hole to the adjacent hole position. The numerical scale can facilitate experimental operation of experimenters, can realize quick reading of positioning numerical values, and can effectively improve the overall efficiency of testing.
Preferably, the positioning disc 7 can be further connected with a rotating handle 8, the end part of the rotating handle 8 is provided with a clamping head, and the clamping head can be embedded in a hole in the edge of the positioning disc 7; after the vertical positioning operation is completed, the chuck is set to be embedded into a hole at the edge of the positioning disk 7 so as to fix the positioning disk 7 to prevent the positioning disk 7 from rotating. When the vertical positioning is carried out, an operator holds and rotates a handle connected with the positioning disc 7, rotates clockwise and moves upwards, and rotates anticlockwise and moves downwards. The numerical scale on the left side of the motor tray determines the vertical measuring position by observing the scale indicated by the pointer during operation, and after the pointer indicates the scale reaching a preset target, the chuck at the end part of the rotary rocking handle is embedded into the positioning hole of the faceplate.
In order to optimize the corresponding control mechanism, the control mechanism in the above scheme of the present application can be realized by the following scheme:
the control mechanism is used for providing an input control signal for the driving motor, and adjusting the rotating speed and the rotating direction of the driving motor by adjusting the input rate and the sign of the signal of the control signal, and the rotating speed of the driving motor is controlled by the control machine at a terminal and is continuously adjustable within a range of (0.01-3600) DEG/sec;
the control circuit is connected with a control signal generating device which is set to provide a control signal and control the frequency and the form of the control signal generated by the generating device through the control circuit;
the control circuit is connected with a sensor signal adjusting device which is set to carry out necessary filtering and amplification on the electric signals output by the measuring sensor and is matched with the cross plate measuring heads of different types for use so as to ensure the precision of the measuring results of different measuring ranges; wherein the range of the sensor is 0-3 N.m, the precision is 0.3%, and the sensitivity is 2 mv/V;
the control circuit is connected with a measuring signal acquisition device which is arranged to acquire the sensor electrical signal processed by the sensor signal conditioning device and transmit the sensor electrical signal to the controller in a digital quantity form;
and the controller connected with the control circuit is used for converting and storing the test result in the digital quantity form, and displaying the continuous change process of the shear strength of the soft clay along with time in the whole shear test on a screen in a graphical mode in real time.
Preferably, the sensor signal adjusting device, the control signal generating device and the measurement signal collecting device are all integrated in a chassis with strong anti-interference capability.
FIG. 4 is a schematic diagram illustrating the variation of shear stress with rotation angle according to an embodiment of the present invention; for reference only by those skilled in the art. As shown in FIG. 4, S on the right side of the windowuThe ordinate value shown in the text box below the/kPa is the shear strength measured by the cross plate test, and is specifically 11.6 KPa. The related parameter is set as test time150 seconds, the testing speed is 0.1 degree/second, and the measuring range of the cross plate head is 0-40 KPa.
It should be noted that, in the present application, the sensor disposed at the cross plate detects the torque applied to the cross plate, and finally converts the torque into the shearing strength value displayed in fig. 4 through operations such as corresponding signal conversion and amplification; the above signal detection conversion is a common signal detection operation in the art, and therefore, the detailed signal detection conversion is not described again. According to the above-mentioned suggestion of the technical solution, in the specific implementation process, a person skilled in the art may select any type of sensor, so as to implement the function of torque detection; wherein, what kind of sensor is selected specifically is not protected by this patent. The operations such as the detection of the signals can be realized by a control circuit, and the components of the control circuit belong to common electrical elements in the field; in addition, the control circuit structure does not involve the improvement of a software program.
The embodiment of the invention also provides a testing method applied to the box-type sampling shear strength testing device, which specifically comprises the following steps:
step a: positioning operation;
performing horizontal positioning operation, namely positioning the cross plate testing component arranged on the driving mechanism right above a point to be tested in the box type sampler to be tested through a horizontal positioning structure; after the horizontal positioning operation is finished, locking the horizontal positioning structure; further, the cross plate testing component arranged on the driving mechanism is positioned at the depth to be tested in the box type sampler to be tested through the vertical positioning mechanism; after the vertical positioning operation is finished, locking the vertical positioning structure;
step b: measuring the shearing strength;
the control circuit controls a driving motor arranged on the driving mechanism to rotate forward and start, and drives the cross plate testing assembly to rotate by a preset angle value; in the rotating process, the torque value borne by the cross plate is collected in real time through the control circuit, and a curve graph showing the change of the shear stress along with the rotating angle is output by combining the corresponding rotating angle value; when the peak value appears in the graph for 1 minute, the experiment is stopped and the peak value is determined as the shearing strength value of the clay to be tested.
Preferably, the operations further comprise the operation of measuring the shear strength of the same point to be measured at different depths;
after the shear strength measurement at the first depth to be measured of the point to be measured is completed, unlocking the vertical positioning structure, and descending and positioning the cross plate testing assembly arranged on the driving mechanism to a second depth to be measured through the vertical positioning structure; after the vertical positioning operation is finished, locking the vertical positioning mechanism; repeating the step b, and measuring the shearing strength value at the second depth to be measured; the first depth to be measured is located above the second depth to be measured.
It should be noted that, when a plurality of depths to be measured of the same point to be measured need to be measured, the above steps are repeated, and different depths to be measured need to be repositioned; in the measurement process, the corresponding depth to be measured needs to be measured from the depth to be measured at the highest position, and the measurement is gradually reduced, so that the disturbance condition of subsequent measurement caused by the current measurement operation can be effectively avoided.
Preferably, the operation further comprises the operation of measuring the shear strength of a plurality of points to be measured at the same depth to be measured; the method specifically comprises the following steps:
after the shear strength measurement of the first point to be measured is completed, unlocking the vertical positioning structure, and returning to the initial position; further unlocking the horizontal positioning structure, and positioning the cross plate testing component arranged on the driving mechanism to be right above the second point to be tested through the horizontal positioning structure; after the horizontal positioning operation is finished, locking the horizontal positioning structure; repeating the vertical positioning operation in the step a to finish the vertical positioning operation; and c, repeating the step b, and measuring the shearing strength value of the second point to be measured. It should be noted that, the third point to be measured, the fourth point to be measured …, and so on, may be measured by referring to the above positioning operation, and details are not described here.
Preferably, the method further comprises the step c: disturbance intensity measurement operation;
the control circuit controls a driving motor arranged on the driving mechanism to rotate forwards and start, and drives the cross plate testing assembly to rotate for a preset number of turns so as to complete soil sample disturbance in the forward rotation direction; when the soil sample disturbance in the forward rotation direction is completed, controlling the driving motor to stop rotating; furthermore, a driving motor arranged on the driving mechanism is controlled by the control circuit to rotate reversely and start, and the cross plate testing assembly is driven to rotate for a preset number of turns so as to complete soil sample disturbance in the reverse direction; when the disturbance of the soil sample in the reverse direction is completed, controlling the driving motor to stop rotating;
the control circuit controls a driving motor arranged on the driving mechanism to rotate forward and start, and drives the cross plate testing assembly to rotate by a preset angle value; in the rotating process, the torque value borne by the cross plate is collected in real time through the control circuit, and a curve graph showing the change of the shear stress along with the rotating angle is output by combining the corresponding rotating angle value; and when the peak value appears in the graph for 1 minute, stopping the experiment and determining the peak value as the disturbance intensity value of the clay to be detected.
It should be noted that the present application relates to in situ strength, in particular shear strength measured directly on the seabed (for example, below 1000 m and under water pressure), and does not relate to the sampling operation of a box sampler; the related undisturbed shear strength is measured in a box-type sampler after sampling from the seabed by the box-type sampler; the disturbance intensity is measured in the box-type sampler after sampling from the seabed by the box-type sampler.
The technical scheme provided by the invention can effectively overcome the defect that the non-drainage shear strength of deep-water shallow-layer weak clay cannot be directly tested by a land conventional cross plate shearing device; the box-type sampler is directly arranged at the bottom of the device, so that the soft clay to be tested in the box can be directly tested, the step of 'secondary sampling' by using a sampling tube in the conventional cross plate shear strength testing method can be effectively avoided, the disturbance of a soil sample is reduced, and the mechanical state of the soft clay in the seabed can be reflected more truly by the testing result; the change process of the strength of the weak clay along with the corner is displayed in real time through a corner-strength curve graph, so that the test result is more visual, a continuous change process can be obtained, and comprehensive data are provided for later monitoring and analysis; the horizontal positioning structure is provided with the sliding groove, so that the horizontal positioning structure has the characteristics of low resistance, high rigidity, high precision and stable operation, effectively solves the problem of difficult positioning caused by dust entering the positioning system in the test process, and can be suitable for severe offshore operation environments with high acidity, alkalinity and humidity; by adopting a positioning disc structure in the vertical positioning device and arranging the equally-spaced indexing holes along the annular direction, vertical positioning with different precisions can be realized by controlling the number of the indexing holes; during vertical positioning, the vertical convenient positioning and accurate positioning can be realized by controlling the number of rotation turns of the positioning disc; the sensor signal amplifying device, the control signal generating device and the measurement signal collecting device are integrated in the case with strong anti-interference capability, and the controller and the driver are arranged in an isolated manner, so that the interference of a strong electric system of the driver on various signals in the test process is effectively reduced, and the truth and the integrity of test data are further ensured; besides the shear strength test of ocean deep water, the method can also be used for carrying out the sensitivity and thixotropy test of weak clay, and can effectively improve the application universality: after the undisturbed strength test is completed, the motor is controlled to rotate at a constant speed to completely disturb the soft clay, and the corresponding disturbing strength is carried out, so that the defects of large discreteness of test data and unobtrusive test results caused by manual disturbance of the soil sample can be effectively overcome.
It should be understood by those skilled in the art that the embodiments of the present invention are described above, but the descriptions are only for the purpose of facilitating understanding of the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (8)
1. A box-type sampling shear strength testing device is characterized by comprising an equipment bracket, a driving mechanism, a positioning mechanism and a control mechanism; wherein,
the equipment support is provided with a cavity for accommodating a box type sampler to be tested, and the upper surface of the equipment support is provided with a positioning mechanism;
the driving mechanism is arranged on the positioning mechanism and provided with a cross plate testing component, and the cross plate testing component is arranged to be inserted into the clay to be tested and measure the shearing strength of the clay;
the positioning mechanism is provided with a horizontal positioning structure and a vertical positioning structure, and the horizontal positioning structure is arranged to realize the horizontal positioning of the cross plate testing component in the box type sampler to be tested; the vertical positioning structure is arranged to realize vertical positioning of the cross plate testing component in the box type sampler to be tested;
the control mechanism is provided with a control circuit and is set to output a starting test instruction to the driving mechanism and read the rotation angle value and the corresponding torque value of the cross plate test assembly in real time;
the equipment support is provided with a leveling structure, and the leveling structure is arranged at the bottom of the equipment support.
2. The box-type sampling shear strength testing apparatus according to claim 1,
the equipment support is arranged into a steel frame structure, the positioning mechanism is arranged on the upper surface of the steel frame structure, and a middle cavity of the steel frame structure is arranged to accommodate a box type sampler to be tested; in the testing process, the driving mechanism is set to enter the box type sampler to be tested placed in the middle cavity along the upper surface of the steel frame structure through the positioning mechanism.
3. The box-type sampling shear strength testing apparatus according to claim 1,
the leveling structure is provided with leveling bolts.
4. The box-type sampling shear strength testing apparatus according to claim 1,
the driving mechanism is provided with a driving motor, and the cross plate testing assembly is provided with a connecting rod and a cross plate; the top end of the connecting rod is connected with the output shaft end of the driving motor, and the bottom end of the connecting rod is connected with the cross plate; the positive rotation of the driving motor is set to test the undisturbed shear strength and the disturbance strength of the clay, and the positive rotation and the negative rotation of the driving motor are set to disturb the clay to be tested and obtain a disturbed soil sample.
5. The box-type sampling shear strength testing apparatus according to claim 4,
the driving motor is arranged to be installed in a vertical positioning structure of the positioning mechanism and is arranged to drive the cross plate testing assembly to perform positioning operation along with the positioning mechanism.
6. The box-type sampling shear strength testing apparatus according to claim 4,
the cross plate testing assembly is provided with a sensor which is arranged to detect a torque value borne by the cross plate in real time and transmit the torque value to the control circuit; the control circuit is configured to receive and store the detected torque value of the sensor and display the detected torque value on a display connected to the control circuit.
7. The box-type sampling shear strength testing apparatus according to claim 1,
the horizontal positioning structure is provided with a first guide rail group and a second guide rail group which are perpendicular to each other, the first guide rail group is arranged on the upper surface of the equipment support, the second guide rail group is arranged above the first guide rail group, and the first guide rail group and the second guide rail group are both provided with two monorail arranged in parallel;
the lower surface of the second guide rail group is provided with a first sliding groove which is arranged for sleeving and installing the first guide rail group and guiding the second guide rail group to slide along the first guide rail group;
a support plate is arranged on the upper surface of the second guide rail group and is used for connecting and supporting the vertical positioning structure; the lower surface of the supporting plate is provided with a second sliding groove, and the second sliding groove is provided with the second guide rail group in a sleeved mode, is used for guiding the supporting plate and slides along the second guide rail group;
the side surfaces of the first sliding groove and the second sliding groove are provided with locking nuts, and the locking nuts are screwed up to fix the second guide rail group and the horizontal position of the supporting plate.
8. The box-type sampling shear strength testing apparatus according to claim 1,
the vertical positioning structure is provided with a third guide rail group and a positioning disc, a gear structure is arranged at a rotating shaft of the positioning disc, positioning holes are formed in the positioning disc at equal intervals along the shape of a ring, and the third guide rail group is correspondingly provided with a rack structure; the rotating action of the positioning disc is set to be matched with the rack and pinion to realize the vertical sliding action along the third guide rail group;
a sliding sleeve is arranged between the positioning disc and the third guide rail group; the sliding sleeve is arranged to be sleeved outside the third guide rail group, is connected with the positioning disc, limits the positioning disc to be separated from the third guide rail group, and vertically slides along with the positioning disc;
the outer side of the sliding sleeve is also connected with a motor supporting plate which is set as a driving motor for mounting the driving mechanism; the third guide rail group is further provided with a vertical scale, the vertical scale is arranged on one side of the driving motor, and the vertical scale is used for observing the descending distance of the driving mechanism.
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| CN110595914B (en) * | 2019-09-19 | 2022-02-11 | 长沙理工大学 | Method for detecting compaction and shearing characteristics of asphalt mixture in construction compaction process |
| CN110593064B (en) * | 2019-09-19 | 2021-07-30 | 长沙理工大学 | Detection device for compaction and shearing characteristics of asphalt mixture in construction compaction process |
| CN111549745B (en) * | 2020-05-27 | 2021-12-17 | 重庆建设工程质量监督检测中心有限公司 | High-precision measurement measuring equipment for geotechnical engineering investigation |
| CN113702151B (en) * | 2021-07-14 | 2024-04-09 | 长沙理工大学 | Mobile portable automatic shearing instrument |
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