CN112082875B - In-situ soil body parameter measuring device based on pressure penetration - Google Patents
In-situ soil body parameter measuring device based on pressure penetration Download PDFInfo
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- CN112082875B CN112082875B CN202010977372.5A CN202010977372A CN112082875B CN 112082875 B CN112082875 B CN 112082875B CN 202010977372 A CN202010977372 A CN 202010977372A CN 112082875 B CN112082875 B CN 112082875B
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- 239000002689 soil Substances 0.000 title claims abstract description 109
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 51
- 230000035515 penetration Effects 0.000 title claims abstract description 37
- 239000000523 sample Substances 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 39
- 238000007596 consolidation process Methods 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 5
- 239000002775 capsule Substances 0.000 description 9
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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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
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an in-situ soil body parameter measuring device based on pressure penetration, which comprises a working barrel, a loading and data acquisition system, a probe rod, a probe, a pressurizing bag body and a pressurizing part, wherein in the test, the working barrel is inserted into a soil body, the loading and data acquisition system controls the probe rod to be slowly loaded until the probe head contacts the surface of the soil body, a pressurizing medium is input into the pressurizing bag body by using the pressurizing part, water in the working barrel is extruded out along with the expansion of the pressurizing bag body, the accuracy of the test result is improved, the pressure in the pressurizing bag body is controlled by the pressurizing part until the surface of the soil body which is in contact with the working barrel is subjected to a uniform design load applied by the pressurizing bag body, and the loading and data acquisition system controls the probe rod to be loaded and unloaded so as to carry out a soil body characteristic parameter test. In addition, the in-situ soil parameter measuring device based on the pressure sounding can also be used for in-situ soil consolidation characteristic tests.
Description
Technical Field
The invention relates to the technical field of research on rock soil, geology and environment, in particular to an in-situ soil body parameter measuring device based on pressure penetration.
Background
Geotechnical in situ testing refers to the investigation and testing of engineering properties of soil in situ at the site. The geotechnical in-situ test can determine the relevant engineering mechanical properties of the undisturbed soil sample which is difficult to obtain; the influence of stress release in the sampling process can be avoided; the influence range is large, and the representativeness is strong. Static sounding (CPT, CPTU, etc.) and full-flow sounding are currently widely used in-situ tests, and have the characteristics of rapidness, directness, and accuracy. The full-flow penetration test probe is in the form of T-bar and ball-bar, and has the measurement principle that the probe is statically pressed into the soil body at a constant speed, when the soil body around the probe reaches a complete backflow state, the soil pressures of the upper surface and the lower surface of the probe are almost equal, the overburden soil pressure does not need to be corrected, and the parameters such as the soil body shear strength and the like can be directly analyzed through the soil body counter force and the pore pressure measured by the sensor.
However, in the actual penetration process, a cavity is formed above the probe when the penetration depth is shallow, and the soil body does not completely flow back at the moment; along with the increase of the penetration depth, the soil body can flow back gradually under the action of gravity, the cavity is closed gradually, and the complete backflow mechanism can only occur to the soil body when the penetration is deeper. That is to say, the physical characteristic parameters of the shallow soil body cannot be accurately measured by the traditional full-flow penetrometer.
Therefore, how to change the current situation that the full-flow penetrometer cannot accurately measure the physical characteristic parameters of the shallow soil body in the prior art becomes a problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to provide an in-situ soil parameter measuring device based on pressure penetration, which is used for solving the problems in the prior art and improving the accuracy of in-situ geotechnical parameter characteristic measurement.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an in-situ soil parameter measuring device based on pressure penetration, which comprises a working barrel, a loading and data acquisition system, a probe rod, a probe, a pressurizing bag body and a pressurizing part, wherein the working barrel is of a hollow structure with an opening at the bottom, one end of the probe rod is connected with the loading and data acquisition system, the loading and data acquisition system can drive the probe rod to reciprocate, one end of the probe rod can slidably extend into the working barrel, one end of the probe rod extending into the working barrel is connected with the probe, the probe is internally provided with a force sensor and a hole pressure sensor, the pressurizing bag body is arranged in the working barrel, the pressurizing bag body is arranged around the probe rod, the pressurizing bag body is positioned at the top of the probe and is communicated with the pressurizing part, and the pressurizing bag body is made of a flexible material, the working barrel is further provided with a communication port, and the communication port is communicated with the external environment.
Preferably, the pressurizing capsule is a hollow structure, and the probe rod passes through the hollow part of the pressurizing capsule to be connected with the probe.
Preferably, the pressurizing bag body is a hollow cylindrical structure, and the inner diameter of the pressurizing bag body is matched with the outer diameter of the probe rod.
Preferably, the pressurizing part is a pressurizing water pump, and the pressurizing water pump is communicated with the pressurizing capsule through a pump pipe.
Preferably, the probe rod and the working barrel are coaxially arranged, the top of the working barrel is connected with a fixing ring and a protection barrel, the protection barrel is communicated with the working barrel, the probe rod penetrates through the protection barrel and extends into the working barrel, a sealing ring is arranged between the probe rod and the protection barrel, the fixing ring is sleeved outside the protection barrel, the fixing ring is connected with the working barrel, and the loading and data acquisition system is located at the top of the protection barrel.
Preferably, the communication port is located at the top of the mandrel.
Preferably, multichannel drainage groove has on the inner wall of working barrel, drainage groove is on a parallel with the axis setting of working barrel, the equidistant equipartition of drainage groove, the drainage groove orientation is kept away from the sunken setting of direction of working barrel axis.
Preferably, the probe is a ball-bar probe, a T-bar probe, a cone-tip static cone probe or a cross-plate probe.
Preferably, the diameter of the mandrel is no less than 5 times the diameter of the probe.
Preferably, the bottom of the working barrel is provided with an insertion part, the insertion part is in a shape of an inverted frustum, and one end of the insertion part with a larger diameter is connected with the working barrel.
Compared with the prior art, the invention has the following technical effects: the invention discloses an in-situ soil parameter measuring device based on pressure penetration, which comprises a working barrel, a loading and data acquisition system, a probe rod, a probe, a pressurizing bag body and a pressurizing part, wherein the working barrel is of a hollow structure with an opening at the bottom, one end of the probe rod is connected with the loading and data acquisition system, the loading and data acquisition system can drive the probe rod to reciprocate, one end of the probe rod can slidably extend into the working barrel, one end of the probe rod extending into the working barrel is connected with the probe, a force sensor and a hole pressure sensor are arranged in the probe, the pressurizing bag body is arranged in the working barrel and surrounds the probe rod, the pressurizing bag body is positioned at the top of the probe, the pressurizing bag body is communicated with the pressurizing part and is made of a flexible material, and the working barrel is also provided with a communication port which is communicated with the external environment. When the in-situ soil parameter measuring device based on the pressure penetration is used, the working cylinder is inserted into the soil, the loading and data acquisition system controls the probe rod to be slowly loaded until the probe contacts the surface of the soil, the pressurizing component is utilized to input a pressurizing medium into the pressurizing bag, when underwater soil parameter measurement is carried out, water in the working cylinder is extruded out along with the expansion of the pressurizing bag, the accuracy of a test result is improved, the pressure in the pressurizing bag is controlled by the pressurizing component until the surface of the soil, which is in contact with the working cylinder, is subjected to uniform design load applied by the pressurizing bag, and the loading and data acquisition system controls the probe rod to be loaded and unloaded, so that a soil characteristic parameter test is carried out. In addition, the in-situ soil parameter measuring device based on the pressure penetration test can also be used for in-situ soil consolidation characteristic tests, after the cyclic penetration test is carried out, the probe rod and the probe are drawn back to the surface position of the soil, the pressurized medium in the pressurized bag is released, the working cylinder is in the natural water pressure condition and is kept still for a period of time, or the pressure in the pressurized bag is controlled to reach a specified pressure value and is kept unchanged, so that disturbed soil is consolidated under the specified consolidation pressure, and the in-situ soil parameter measuring device is used for measuring the soil strength recovery characteristics under different consolidation pressures. And after the consolidation is finished, introducing a pressurized medium into the pressurized bag again until the pressurized medium reaches the design pressure, then controlling the probe rod and the probe to perform a pressure penetration test again, and measuring the soil body strength of the in-situ soil with different consolidation degrees. And in the whole test process, pore pressure and counter force are measured by using a pore pressure sensor and a force sensor which are arranged in a probe, so that the in-situ soil consolidation characteristic is analyzed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of the in-situ soil parameter measuring device based on the pressure penetration test of the present invention;
FIG. 2 is a partial schematic structural diagram of an in-situ soil parameter measuring device based on a pressure sounding according to the present invention;
FIG. 3 is a schematic structural diagram of different types of probes of the in-situ soil parameter measuring device based on the piezoscopy of the invention;
FIG. 4 is a sectional view of a part of the structure of the in-situ soil parameter measuring device based on the pressure penetration probe;
the device comprises a working barrel 1, a loading and data acquisition system 2, a probe rod 3, a probe 4, a pressurizing bag body 5, a pressurizing part 6, a pore pressure sensor 7, a force sensor 8, a fixing ring 9, a protection barrel 10, a sealing ring 11, a communication port 12, a drainage groove 13, an insertion part 14 and a pump pipe 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an in-situ soil parameter measuring device based on pressure penetration, which is used for solving the problems in the prior art and improving the accuracy of in-situ geotechnical parameter characteristic measurement.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 4, fig. 1 is a schematic working diagram of an in-situ soil parameter measuring device based on a pressure penetration probe according to the present invention, fig. 2 is a schematic partial structure diagram of the in-situ soil parameter measuring device based on a pressure penetration probe according to the present invention, fig. 3 is a schematic structural diagram of different types of probes of the in-situ soil parameter measuring device based on a pressure penetration probe according to the present invention, and fig. 4 is a schematic sectional view of a partial structure of the in-situ soil parameter measuring device based on a pressure penetration probe according to the present invention.
It should be noted that the in-situ soil parameter measuring device based on the pressure penetration test of the present invention is suitable for measuring parameters of dry soil and underwater soil, and because the situation of measuring parameters of underwater soil is complicated, the following detailed description explains the in-situ soil parameter measuring device based on the pressure penetration test of the present invention by taking underwater soil parameter measurement as an example.
The invention provides an in-situ soil parameter measuring device based on pressure penetration, which comprises a working barrel 1, a loading and data acquisition system 2, a probe rod 3, a probe 4, a pressurizing bag body 5 and a pressurizing part 6, wherein the working barrel 1 is of a hollow structure with an opening at the bottom, one end of the probe rod 3 is connected with the loading and data acquisition system 2, the loading and data acquisition system 2 can drive the probe rod 3 to reciprocate, one end of the probe rod 3 can slidably extend into the working barrel 1, one end of the probe rod 3 extending into the working barrel 1 is connected with the probe 4, the probe 4 is internally provided with a force sensor 8 and a pore pressure sensor 7, the pressurizing bag body 5 is arranged in the working barrel 1, the pressurizing bag body 5 is arranged around the probe rod 3, the pressurizing bag body 5 is positioned at the top of the probe 4, the pressurizing bag body 5 is communicated with the pressurizing part 6, the pressurizing bag body 5 is made of a flexible material, the working barrel 1 is also provided with a communication port 12, the communication port 12 communicates with the outside environment.
When the in-situ soil parameter measuring device based on the pressure penetration test is used, the working barrel 1 is installed to a certain depth under water, the loading and data acquisition system 2 controls the probe rod 3 to be slowly loaded until the probe 4 contacts the surface of a soil body, a pressurizing medium is input into the pressurizing bag body 5 by using the pressurizing part 6, water in the working barrel 1 is extruded out along with the expansion of the pressurizing bag body 5, the accuracy of a test result is improved, the pressure in the pressurizing bag body 5 is controlled by the pressurizing part 6 until the surface of the soil body contacting with the working barrel 1 is subjected to a uniform design load applied by the pressurizing bag body 5, and the loading and data acquisition system 2 controls the probe rod 3 to be loaded and unloaded so as to perform a soil body characteristic parameter test. In addition, the in-situ soil parameter measuring device based on the pressure penetration test can also be used for in-situ soil consolidation characteristic tests, after the cyclic penetration test is carried out, the probe rod 3 and the probe 4 are drawn back to the surface position of the soil, the pressurized medium in the pressurizing bag body 5 is released, the working cylinder 1 is in the natural water pressure condition, the working cylinder is kept standing for a period of time (the standing time is determined according to the test requirement), or the pressure in the pressurizing bag body 5 is controlled to reach a specified pressure value and is kept unchanged, so that disturbed soil is consolidated under the specified consolidation pressure, and the soil strength recovery characteristic under different consolidation pressures is measured. After the consolidation is finished, introducing the pressurized medium into the pressurized capsule body 5 again until the designed pressure is reached, then controlling the probe rod 3 and the probe 4 to perform a pressure penetration test again, and measuring the soil body strength of the in-situ soil with different consolidation degrees. In the whole test process, the pore pressure sensor 7 and the force sensor 8 which are arranged in the probe 4 are used for measuring the pore pressure and the counter force so as to analyze the consolidation characteristics of the in-situ soil.
In order to apply pressure to the soil body of the test part uniformly, the pressurizing bag body 5 is of a hollow structure, and the probe rod 3 penetrates through the hollow part of the pressurizing bag body 5 to be connected with the probe 4.
In this embodiment, the pressurizing bag body 5 is a hollow cylindrical structure, and the inner diameter of the pressurizing bag body 5 is matched with the outer diameter of the probe rod 3, so as to further ensure that the soil body of the test part is subjected to uniformly distributed pressure.
It should be noted that the pressurizing medium may be a medium such as water or gas that can fill the inside of the pressurizing capsule 5 to be inflated and pressurized, in the present embodiment, the pressurizing unit 6 is a pressurizing water pump, the pressurizing water pump is communicated with the pressurizing capsule 5 through a pump pipe 15, and the pressurizing water pump pumps water into the pressurizing capsule 5 to apply pressure to the soil mass at the test portion. It should be noted that the present invention is further provided with a control system, and the control system is connected with the loading and data acquisition system 2 and the pressurized water pump, so as to be convenient for an operator to control.
Specifically, probe rod 3 and working barrel 1 are coaxial, the top of working barrel 1 is connected with solid fixed ring 9 and a protection barrel 10, protection barrel 10 is linked together with working barrel 1, probe rod 3 passes in protection barrel 10 stretches into working barrel 1, protection barrel 10 can protect probe rod 3 not receive external disturbance, ensure that the experiment goes on smoothly, set up sealing ring 11 between probe rod 3 and the protection barrel 10, sealing ring 11 can prevent to have the pressure to visit when the soil body extrusion gets into protection barrel 10, influence the test result. The fixing ring 9 is sleeved outside the protection barrel 10, the fixing ring 9 is connected with the working barrel 1, the stability of the protection barrel 10 is further improved, the reliability of the device is improved, and the loading and data acquisition system 2 is located at the top of the protection barrel 10.
In addition, the communication port 12 is located at the top of the working barrel 1, so that water in the working barrel 1 can be discharged smoothly, and meanwhile, a water body is prevented from entering the working barrel 1 to influence the smooth test.
More specifically, the inner wall of the working barrel 1 is provided with a plurality of drainage grooves 13, the drainage grooves 13 are arranged in parallel to the axis of the working barrel 1, the drainage grooves 13 are uniformly distributed at equal intervals, and the drainage grooves 13 are arranged in a concave mode towards the direction far away from the axis of the working barrel 1. Set up drainage groove 13 on the inner wall of working barrel 1, be convenient for working barrel 1 more smoothly penetrates deeper in the soil on the one hand, provide the required resistance to plucking of work, on the other hand, when underwater operation (like seabed surface or riverbed surface soil body parameter measurement), can guarantee that pressurization utricule 5 expands behind the certain volume and the residual water of soil body surface contact position under water can discharge through drainage groove 13 smoothly, make pressurization utricule 5 and soil body surface fully contact under water, apply to coat pressure better more in a flexible way. It should be emphasized here that the height of the working barrel 1 is determined according to the site conditions, so as to ensure that the working area is reserved after the working barrel 1 penetrates a certain depth, and sufficient anti-pulling force can be provided to ensure that the whole experimental device is stable when the pressurizing bag body 5 applies pressure. The drainage groove 13 may be used to vent gas when dry soil parameter measurements are made.
The probe 4 is detachably connected with the probe rod 3, different types of probes 4 can be selected when different geotechnical tests are carried out, and the probes 4 include but are not limited to ball-bar probes, T-bar probes, cone-point probes for static cone penetration or cross plate probes. T-bar and ball-bar can be used for measuring soil strength and softening parameters by a pressure cycle penetration test. The cone-point probe and the cross plate probe for static sounding can measure the soil body internal friction angle by changing the overlying pressure besides measuring the soil body strength and softening parameters (the cross plate can measure the clay sensitivity).
Further, the diameter of the working barrel 1 is not less than 5 times the diameter of the probe 4, so that the influence of the boundary effect is reduced and eliminated.
Furthermore, the bottom of the working barrel 1 is provided with an insertion part 14, the insertion part 14 is in an inverted circular truncated cone shape, one end of the insertion part 14 with a larger diameter is connected with the working barrel 1, the insertion part 14 is arranged to facilitate the working barrel 1 to penetrate into the soil body, and in practical application, the installation mode of the working barrel 1 is selected according to site conditions, for example, for land soil, the working barrel 1 can be penetrated into the soil body to a specified depth by using an external force pressurization mode, such as a foot treading mode and the like; for underwater soil, such as seabed surface soil or riverbed soil, a suction negative pressure cylinder or other loading modes can be used for auxiliary installation, so that the working cylinder 1 and the pressurizing bag body 5 are pressed into the soil body.
The in-situ soil parameter measuring device based on the pressure penetration is suitable for accurately measuring in-situ geotechnical parameter characteristics (such as soil strength, internal friction angle, cohesive soil sensitivity and the like). The pressurizing bag body 5 flexibly applies overlying pressure to the surface of the soil body, so that a full-course complete backflow penetration test can be realized, and the in-situ soil strength and the softening characteristic (such as sensitivity) can be more accurately measured; the in-situ soil internal friction angle can be measured by changing the covering pressure on the surface of the soil body.
The invention can also be used for the consolidation characteristic test of in-situ soil. After the primary pressure circulation penetration test is finished, the probe rod 3 can be withdrawn (the probe rod 3 can also be placed at a specified depth, and the pore pressure sensor 7 arranged in the probe 4 is used for measuring the ultra-pore pressure at the specified depth), pressurized water in the pressurizing capsule body 5 is released, so that the disturbed soil is consolidated under natural conditions, and the pressurizing capsule body 5 can also be controlled to apply specified overlying pressure, so that the disturbed soil is consolidated under the specified consolidation pressure. Put probe rod 3 after the design consolidation time finishes, the pump is full of pressurization utricule 5, carries out the penetration test of whole journey complete reflux, measures the soil body intensity of different consolidation degrees, and then carries out normal position soil consolidation characteristic analysis, provides help for the accurate analysis of basic bearing capacity.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The utility model provides an in situ soil body parameter measurement device based on there is sounding which characterized in that: comprises a working barrel, a loading and data acquisition system, a probe rod, a probe, a pressurizing bag body and a pressurizing part, the working barrel is of a hollow structure with an opening at the bottom, one end of the probe rod is connected with the loading and data acquisition system, the loading and data acquisition system can drive the probe rod to reciprocate, one end of the probe rod can slidably extend into the working barrel, one end of the probe rod extending into the working barrel is connected with the probe, the probe is internally provided with a force sensor and a pore pressure sensor, the pressurizing bag body is arranged in the working barrel and is arranged around the probe rod, the pressurizing bag body is positioned at the top of the probe and is communicated with the pressurizing component, the pressurizing bag body is made of flexible materials, the working barrel is also provided with a communication port, and the communication port is communicated with the external environment; the communicating port is located at the top of the working barrel, a plurality of drainage grooves are formed in the inner wall of the working barrel and are parallel to the axis of the working barrel, the drainage grooves are evenly distributed at equal intervals, and the drainage grooves face away from the direction of the axis of the working barrel and are arranged in a concave mode.
2. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the pressurizing bag body is of a hollow structure, and the probe rod penetrates through the hollow part of the pressurizing bag body to be connected with the probe.
3. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 2, wherein: the pressurizing bag body is of a hollow cylindrical structure, and the inner diameter of the pressurizing bag body is matched with the outer diameter of the probe rod.
4. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the pressurizing part is a pressurizing water pump which is communicated with the pressurizing bag body through a pump pipe.
5. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the probe rod and the working barrel are coaxially arranged, the top of the working barrel is connected with a fixing ring and a protection barrel, the protection barrel is communicated with the working barrel, the probe rod penetrates through the protection barrel and extends into the working barrel, a sealing ring is arranged between the probe rod and the protection barrel, the fixing ring is sleeved outside the protection barrel, the fixing ring is connected with the working barrel, and the loading and data acquisition system is located at the top of the protection barrel.
6. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the probe is a ball-bar probe, a T-bar probe, a cone-tip probe for static cone penetration or a cross plate probe.
7. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the diameter of the working barrel is not less than 5 times of the diameter of the probe.
8. The in-situ soil parameter measurement device based on the pressure sounding as claimed in claim 1, wherein: the bottom of working barrel has the inserted part, the inserted part is the inverted circular truncated cone form, the great one end of diameter of inserted part with the working barrel links to each other.
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| CN202010977372.5A CN112082875B (en) | 2020-09-17 | 2020-09-17 | In-situ soil body parameter measuring device based on pressure penetration |
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