CN210720005U - Indoor direct shear test device of soil-rock mixture - Google Patents
Indoor direct shear test device of soil-rock mixture Download PDFInfo
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- CN210720005U CN210720005U CN201921365249.7U CN201921365249U CN210720005U CN 210720005 U CN210720005 U CN 210720005U CN 201921365249 U CN201921365249 U CN 201921365249U CN 210720005 U CN210720005 U CN 210720005U
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Abstract
The utility model provides an indoor direct shear test device of soil stone mixture, includes: the top and the side of the frame body are respectively provided with an installation area; the horizontal bearing mechanism is arranged at the bottom of the frame body and comprises a shearing box and a bearing part, wherein the shearing box comprises a fixed part and a moving part arranged above the fixed part, the bottom of the fixed part is arranged at the bottom of the frame body, and the moving part is stacked at the top of the fixed part; the bearing part is arranged at the top of the shearing box; the force application unit comprises a vertical force application part and a transverse force application part, wherein the vertical force application part is suspended in a top mounting area of the frame body, and a force application end of the vertical force application part is in contact with the bearing component; the transverse force application part is suspended in the side surface mounting area of the frame body, and the force application end of the transverse force application part is kept in contact with the moving part; and the detection unit is arranged in the frame body and comprises a plurality of displacement meters and pressure sensors. The utility model has the advantages that: can carry out indoor direct shear test and indoor consolidation test to the soil stone mixture, simple structure, convenient operation.
Description
Technical Field
The utility model relates to an indoor direct shear test device of soil stone mixture.
Background
In engineering geological exploration of deep foundation pit engineering, soil mixed by fine-grained soil and coarse-grained soil is often encountered, and the soil is called an earth-rock mixture. Because the coarse grain diameter of the soil-rock mixture is larger, the shear strength parameter of the soil-rock mixture can not be accurately measured by adopting the conventional small triaxial apparatus or the direct shear test apparatus, so that the design of a set of indoor direct shear test apparatus capable of measuring the shear strength parameter of the soil-rock mixture is important.
In a general direct shear apparatus, during a shear test, the shear resistant area of a sample can be reduced along with the increase of deformation during the test, so that the test result can be influenced. In addition, the static lateral pressure coefficient k of the earth-rock mixture cannot be measured on a conventional direct shear test instrument0。
Patent publication No. CN107860647A discloses a shear box device for constant section straight shear experiments. The structure consists of an upper shearing box and a lower shearing box, wherein the inner diameter of the lower shearing box is larger than that of the upper shearing box, and the inner diameters of the upper shearing box and the lower shearing box have a difference of 1.2 times of the maximum shearing distance of the direct shear apparatus. However, the patent does not guarantee the same pressure in the upper and lower shear boxes during the shearing process.
Patent publication No. CN207123458U discloses a fully automatic direct shear apparatus. The structure comprises a pressurizing frame, a water tank base, an upper shearing box and a lower shearing box, wherein a drainage groove and a drainage hole are formed in the water tank base, but the patent can not measure the static side pressure coefficient k0。
Disclosure of Invention
In order to solve the above problems, the utility model disclosesProvides a method for performing indoor direct shear test on the soil-rock mixture and measuring the static side pressure coefficient k of the soil-rock mixture0Indoor direct shear test device.
Indoor direct shear test device of soil-rock mixture, a serial communication port, include:
the top and the side of the frame body are respectively provided with an installation area;
the horizontal bearing mechanism is arranged at the bottom of the frame body and comprises a shearing box and a bearing part, wherein the shearing box comprises a fixed part and a moving part arranged above the fixed part, the bottom of the fixed part is arranged at the bottom of the frame body, and the moving part is stacked at the top of the fixed part; the bearing part is arranged at the top of the shearing box and used for transmitting longitudinal pressure to the moving part of the horizontal bearing mechanism;
the force application unit comprises a vertical force application part and a transverse force application part, wherein the vertical force application part is suspended in a top mounting area of the frame body, and a force application end of the vertical force application part is in contact with the bearing component and is used for providing longitudinal pressure for the horizontal bearing mechanism; the transverse force application part is suspended in the side surface mounting area of the frame body, and the force application end of the transverse force application part is kept in contact with the moving part and used for pushing the moving part to enable the moving part and the fixed part to generate horizontal relative motion;
the detection unit is arranged in the frame body and comprises a plurality of displacement meters and pressure sensors, wherein the displacement meters are arranged on the moving part of the horizontal bearing mechanism and/or the force application unit and are used for detecting the transverse displacement and/or the longitudinal displacement of the horizontal bearing mechanism; the pressure sensor is arranged at the testing holes of the upper shearing box and the lower shearing box and used for measuring the pressure of the soil sample at the testing holes.
The shearing box is composed of an upper shearing box and a lower shearing box which are vertically overlapped, wherein the lower shearing box is used as a fixing part and is arranged at the bottom of the frame body, and the side wall of the lower shearing box is embedded with a permeable stone; the upper shearing box is used as a moving part and is arranged at the top of the lower shearing box, and the upper shearing box and the lower shearing box enclose a containing cavity.
The lateral wall of going up shear box and lower shear box is equipped with 1 test hole respectively.
The box cavity of the upper shearing box is of an upper and lower through cavity structure, and the box cavity of the lower shearing box is of an upper opening structure.
The ball bearing is arranged at the bottom of the lower shearing box or at the top of the upper shearing box.
The right side of the lower shearing box is connected with a small shearing box.
The bearing part comprises a bearing plate and balls, and the bearing plate is laid on the top surface of the upper shearing box; the ball sets up between bearing plate and the top surface of last shear box.
The displacement meter comprises a vertical displacement meter and an upper shear box displacement meter, wherein the vertical displacement meter is arranged at the force application end of the vertical force application part or on the bearing plate; the upper shear box displacement meter is arranged on the upper shear box.
The pressure sensor is a soil pressure sensor and is arranged at the measuring holes of the upper shearing box and the lower shearing box.
The frame body is a reaction frame, wherein a bracket is arranged in a side mounting area on one side of the reaction steel frame, and the bracket is composed of vertical steel plates and horizontal steel plates arranged on the vertical steel plates.
The vertical force application part is a vertical jack, and the horizontal force application part is a horizontal hydraulic jack.
And in the consolidation stage, the horizontal jack stops running, the pressure of the vertical jack is controlled until the consolidation is complete, and the soil pressure can be measured at the same time. In the shearing stage, when the pressure of the vertical jack reaches the designed consolidation pressure and the soil sample is consolidated, the thrust of the horizontal jack is applied until the soil sample is damaged. And a ball is arranged between the upper bearing plate and the upper shearing box.
The utility model has the advantages that: can carry out indoor direct shear test and indoor consolidation test to the soil stone mixture, keep shearing in-process shear plane invariant simultaneously, eliminate the experimental error that produces because of the shear plane changes in general experiment, simple structure, convenient operation.
Drawings
Fig. 1 is a structural view of the present invention.
Fig. 2 is a plan view of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
With reference to the accompanying drawings:
the top and the side of the frame body 1 are respectively provided with an installation area;
the horizontal bearing mechanism is arranged at the bottom of the frame body 1 and comprises a shearing box and a bearing part, wherein the shearing box comprises a fixed part and a moving part arranged above the fixed part, the bottom of the fixed part is arranged at the bottom of the frame body 1, and the moving part is stacked on the top of the fixed part; the bearing part is arranged at the top of the shearing box;
the force application unit comprises a vertical force application part 4 and a transverse force application part 2, wherein the vertical force application part 4 is suspended in a top installation area of the frame body 1, and a force application end of the vertical force application part 4 is connected with the bearing component; the transverse force application part is suspended in the side surface mounting area of the frame body, and the force application end of the transverse force application part is kept in contact with the moving part;
the detection unit is arranged in the frame body and comprises a plurality of displacement meters and pressure sensors, wherein the displacement meters are arranged on the moving part of the horizontal bearing mechanism and/or the force application unit; the pressure sensor is arranged at the test holes of the upper shearing box and the lower shearing box.
The shearing box is composed of an upper shearing box 11 and a lower shearing box 7 which are vertically overlapped, wherein the lower shearing box 7 is used as a fixing part and is arranged at the bottom of the frame body 1, and the side wall of the lower shearing box is embedded with a permeable stone 8; the upper shearing box 11 is used as a moving part and is arranged at the top of the lower shearing box 7, and the upper shearing box and the lower shearing box enclose a cavity.
The side wall of the upper shear box 11 is provided with a test hole for mounting a pressure sensor.
The side wall of the lower shearing box 7 is provided with a test hole for installing a pressure sensor.
The box cavity of the upper shearing box 11 is of an upper and lower through cavity structure, the box cavity of the lower shearing box 7 is of an upper opening structure, and the right side of the lower shearing box is connected with a small shearing box.
The ball bearing is arranged at the bottom of the lower shearing box or at the top of the upper shearing box.
The bearing part comprises a bearing plate 12 and a ball 13, and the bearing plate 12 is laid on the top surface of the upper shearing box; the ball 13 is arranged between the bearing plate and the top surface of the upper shear box.
The displacement meter comprises a vertical displacement meter 3 and an upper shear box displacement meter 5, wherein the vertical displacement meter 3 is arranged at the force application end of the vertical force application part 4 or on the bearing plate; the upper shear box displacement meter is arranged on the upper shear box.
The pressure sensor 6 is a pressure sensor and is respectively arranged at the measuring holes of the upper shearing box and the lower shearing box.
The support body 1 is a reaction frame and comprises a top beam, a force transmission column and a bottom plate, the top beam is parallel to the bottom plate, the top beam and the bottom plate are connected through the force transmission column, a bracket is arranged in a side mounting area on one side of the reaction steel frame, and the bracket is composed of a vertical steel plate 9 and a horizontal steel plate 10 arranged on the vertical steel plate.
The vertical force application part 4 is a vertical jack, and the horizontal force application part 2 is a horizontal hydraulic jack.
The implementation steps of the invention are as follows:
the first step is as follows: determining the size of the invention according to the maximum crushed stone particle size in the actual soil-rock mixture;
the second step is that: in the consolidation stage, the horizontal jack stops running, the pressure of the vertical jack is controlled, the deformation of the vertical displacement meter is recorded until the deformation is stable, and the soil sample consolidation can be considered to be finished; reading the readings of the two pressure sensors of the upper shearing box and the lower shearing box, taking an average value, combining the pressure value of the vertical jack, and calculating the static soil pressure coefficient k0；
The third step: and in the shearing stage, keeping the pressure of the vertical jack at a preset design value, and starting to apply the thrust of the horizontal jack until the soil sample is damaged or deformed to a maximum value. And a ball is arranged between the upper bearing plate and the upper shearing box. When the upper shearing box moves rightwards, the soil in the box is contacted with the soil in the small shearing box at the right side of the lower shearing box, so that the contact area of the soil in the whole shearing process is kept constant.
Example 2 in this example: a force transmission column and a vertical jack are arranged downwards on the top beam of the reaction frame, a horizontally arranged bearing plate is arranged at the end part of a piston rod of the vertical jack, and an upper shearing box and a lower shearing box are arranged from top to bottom under the horizontally arranged bearing plate; the box cavity of the upper shearing box is of an upper and lower through cavity structure, the box cavity of the lower shearing box is of an upper opening structure, and the right side of the lower shearing box is connected with a small shearing box; the ball bearing is arranged at the bottom of the lower shearing box or at the top of the upper shearing box; a piston rod of the horizontal hydraulic jack is in contact with the corresponding side wall of the lower shearing box or the upper shearing box; the horizontal bearing mechanism is contacted with the corresponding side wall of the upper shearing box or the lower shearing box. A vertical steel plate is arranged on the side face of one side of the counterforce steel frame, a horizontal steel plate is arranged in the middle of the vertical steel plate, a piston rod of the horizontal hydraulic jack stretches in the horizontal direction, and a piston rod of the vertical jack stretches in the vertical direction.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concepts.
Claims (10)
1. The utility model provides an indoor direct shear test device of soil stone mixture which characterized in that includes:
the top and the side of the frame body are respectively provided with an installation area;
the horizontal bearing mechanism is arranged at the bottom of the frame body and comprises a shearing box and a bearing part, wherein the shearing box comprises a fixed part and a moving part arranged above the fixed part, the bottom of the fixed part is arranged at the bottom of the frame body, and the moving part is stacked at the top of the fixed part; the bearing part is arranged at the top of the shearing box and used for transmitting longitudinal pressure to the moving part of the horizontal bearing mechanism;
the force application unit comprises a vertical force application part and a transverse force application part, wherein the vertical force application part is suspended in a top mounting area of the frame body, and a force application end of the vertical force application part is connected with the bearing component and used for providing longitudinal pressure for the horizontal bearing mechanism; the transverse force application part is suspended in the side surface mounting area of the frame body, and the force application end of the transverse force application part is kept in contact with the moving part and used for pushing the moving part to enable the moving part and the fixed part to generate horizontal relative motion;
the detection unit is arranged in the frame body and comprises a plurality of displacement meters and pressure sensors, wherein the displacement meters are arranged on the moving part of the horizontal bearing mechanism and/or the force application unit and are used for detecting the transverse displacement and/or the longitudinal displacement of the horizontal bearing mechanism; the pressure sensor is arranged at the testing holes of the upper shearing box and the lower shearing box and used for measuring the pressure of the soil sample at the testing holes.
2. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the shearing box is composed of an upper shearing box and a lower shearing box which are vertically overlapped, wherein the lower shearing box is used as a fixing part and is arranged at the bottom of the frame body, and the side wall of the lower shearing box is embedded with permeable stones for water in the soil sample in the accommodating cavity to seep out; the upper shearing box is used as a moving part and is arranged at the top of the lower shearing box, and the upper shearing box and the lower shearing box enclose a containing cavity for containing a soil sample.
3. The indoor direct shear test device for the soil-rock mixture as claimed in claim 2, wherein: the side walls of the upper shearing box and the lower shearing box are provided with test holes for mounting the pressure sensors.
4. The indoor direct shear test device for the soil-rock mixture as claimed in claim 3, wherein: the box cavity of the upper shearing box is of an upper and lower through cavity structure, the box cavity of the lower shearing box is of an upper opening structure, and the right side of the lower shearing box is connected with a small shearing box.
5. The indoor direct shear test device for the soil-rock mixture as claimed in claim 4, wherein: the ball bearing is arranged at the bottom of the lower shearing box or at the top of the upper shearing box.
6. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the bearing component comprises a bearing plate and balls, and the bearing plate is laid on the top surface of the upper shearing box and used for uniformly transmitting the pressure of the vertical force application part to the top surface of the upper shearing force; the ball sets up between bearing plate and the box top surface of last shearing for reduce the friction between last shear frame and the last bearing plate when carrying out the horizontal shear.
7. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the displacement meter comprises a vertical displacement meter and an upper shear box displacement meter, wherein the vertical displacement meter is arranged on a force application end of the vertical force application part or the bearing plate and is used for detecting the longitudinal displacement of the force application end of the vertical force application part; the upper shearing box displacement meter is arranged on the upper shearing box and used for detecting the transverse displacement of the upper shearing box.
8. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the pressure sensors are pore pressure sensors, are arranged at the measuring holes of the upper shearing box and the lower shearing box and are used for detecting the soil sample pressure at the measuring holes, and the number of the pressure sensors is two.
9. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the support body is the reaction frame, including back timber, power transmission post and bottom plate, back timber and bottom plate parallel arrangement to link to each other through the power transmission post between the two, wherein be equipped with the bracket that is used for placing horizontal force application portion in the side-mounting district of reaction steelframe one side, the bracket comprises erecting the steel sheet and setting up the horizontal steel sheet of bestriding on the steel sheet.
10. The indoor direct shear test device for the soil-rock mixture as claimed in claim 1, wherein: the vertical force application part is a vertical jack, and the horizontal force application part is a horizontal hydraulic jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921365249.7U CN210720005U (en) | 2019-08-21 | 2019-08-21 | Indoor direct shear test device of soil-rock mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921365249.7U CN210720005U (en) | 2019-08-21 | 2019-08-21 | Indoor direct shear test device of soil-rock mixture |
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| Publication Number | Publication Date |
|---|---|
| CN210720005U true CN210720005U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921365249.7U Active CN210720005U (en) | 2019-08-21 | 2019-08-21 | Indoor direct shear test device of soil-rock mixture |
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| CN (1) | CN210720005U (en) |
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- 2019-08-21 CN CN201921365249.7U patent/CN210720005U/en active Active
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