CN220751863U - In-situ soil and structure contact surface shearing test device - Google Patents
In-situ soil and structure contact surface shearing test device Download PDFInfo
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- CN220751863U CN220751863U CN202321931139.9U CN202321931139U CN220751863U CN 220751863 U CN220751863 U CN 220751863U CN 202321931139 U CN202321931139 U CN 202321931139U CN 220751863 U CN220751863 U CN 220751863U
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Abstract
The utility model discloses an in-situ soil and structure contact surface shearing test device which comprises a shearing test device body, wherein a pressure bearing rod is arranged on the shearing test device body, a base plate is arranged above the outer part of the pressure bearing rod, a direction control hole is arranged above the base plate, a displacement sensor, a normal displacement meter, the base plate and a limit gauge are arranged on one side of the direction control hole, a rotating ring and a torque sensor are arranged above the direction control hole, a scissors meter is arranged on one side of the torque sensor, a pressure box is arranged above the torque sensor, and a loading disc is arranged on the outer side of the pressure box.
Description
Technical Field
The utility model relates to the technical field of geotechnical engineering construction, in particular to an in-situ soil and structure contact surface shearing test device.
Background
In geotechnical engineering construction, a large number of soil and structure contact surfaces exist, and due to different material properties of the soil and the structure, the contact surfaces have larger mechanical property difference compared with the soil and the structure, and are weak positions in a soil and structure interaction system, and shear strength parameters of in-situ soil and structure contact surfaces are important reference indexes of foundation engineering construction.
According to the technical search, the Chinese patent publication No. CN 110514531A discloses an in-situ test device for friction characteristics of a torsional shear structure and soil and a working method thereof, the device comprises an upper sleeve, a lower sleeve and a torsional shear instrument, a structural sample is a hollow cylindrical prefabricated component, the cross section of the structural sample is square-hole copper coin-shaped, the structural sample is fixedly arranged on a square rotating shaft in the middle of the torsional shear instrument, the structural sample is driven by an upper torque output control device to rotate around a mandrel at a set angular speed, a cylindrical shearing surface is formed in foundation soil, the front end of the torsional shear instrument is connected with a permeable stone with a built-in hole pressure sensor, the torque output control device, the square rotating shaft and the permeable stone are all centered on the mandrel, the device has small installation disturbance, the contact surface area in the shearing process is constant, the shearing drainage rate and the drainage condition can be controlled, and the soil and the structural friction characteristics under the in-situ stress state and the set drainage condition can be effectively obtained.
Disclosure of Invention
The utility model aims to provide an in-situ soil and structure contact surface shearing test device so as to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the shearing testing device for the contact surface of the in-situ soil and the structure comprises a shearing testing device body, wherein a pressure-bearing rod is arranged on the shearing testing device body, a base plate is arranged outside the upper part of the pressure-bearing rod, and the base plate is installed in a matched manner with the pressure-bearing rod;
the upper center of the backing plate is provided with a direction control hole, the direction control hole is sleeved outside the pressure-bearing rod, a rotating ring is arranged above the direction control hole, a torque sensor is arranged right above the rotating ring, a pressure box is arranged right above the torque sensor, the pressure box is matched with the top end of the pressure-bearing rod, weights are matched inside the pressure box, a loading disc is arranged on the outer side of the pressure box, and the outer wall of the pressure box is fixedly connected with the loading disc through a connecting rod;
the bottom end of the pressure-bearing rod is provided with a shear plate, the center of the upper surface of the shear plate is provided with a thread head, and the pressure-bearing rod is fixedly arranged perpendicular to the upper surface of the shear plate;
a limit gauge is arranged on one side of the direction control hole in a matched mode, the limit gauge is perpendicular to the base plate and is matched with the rotating ring, a displacement sensor and a normal displacement meter are arranged on one side of the limit gauge, and a matched mounting block is arranged at the bottoms of the displacement sensor and the normal displacement meter and the upper surface of the base plate;
one side cooperation of torque sensor is equipped with the scissors table, and torque sensor constitutes shear force measurement system with the scissors table, and torque sensor can survey the torque value that the in-process that the shearing plate took place to shear born, through the formula of moment of couple:
M＝∫ 0 R τ×2πR 2 dR
the average shear stress on the contact surface can be calculated as:
compared with the prior art, the utility model has the beneficial effects that:
(1) The limit gauge can limit the rotation of the rotary ring, so that the rotary ring only moves along with the pressure-bearing rod in the vertical direction, the rotary ring is connected with the displacement sensor, the displacement sensor can measure the normal displacement of the soil body in the consolidation stage and the shearing stage of applying normal stress, and the normal displacement meter can display the normal displacement reading in real time;
(2) The upper part of the shearing plate is fixed with a screw, the shearing plate is connected with a pressure-bearing rod through the screw, a direction control hole is formed in a backing plate, the pressure-bearing rod penetrates through the direction control hole, the outer diameter of the pressure-bearing rod is the same as the inner diameter of the direction control hole, the effect of the direction control hole is to ensure pressure bearing, the transmitted pressure direction is vertically downward, and the pressure head can be rotated through rotating a loading disc, so that the shearing plate and a lower soil body are sheared, and the backing plate is placed at the upper part of a hole to bear an upper structure and maintain the horizontal and stable effects;
(3) The shearing test device can realize uniform application of normal stress, determine normal displacement of soil consolidation and shearing stages, avoid the problem that the upper part of the pressing head needs to overcome soil resistance in the lifting process by adopting the traditional lifting shearing test method in a rotary shearing mode, and simulate the shearing of an underground structure and an in-situ soil body of an actual engineering more truly.
Drawings
FIG. 1 is a schematic view of a shear test device according to the present utility model;
FIG. 2 is a schematic diagram of the structure of the utility model in which the pressure-bearing rod and the loading plate are assembled;
FIG. 3 is a schematic view of the assembly structure of the pad and the detection assembly of the present utility model.
Drawing of the figure in (a): 1. a pressure cell; 2. loading a disc; 3. a scissors table; 4. a rotating ring; 5. a direction control hole; 6. shearing a plate; 7. a weight; 8. a torque sensor; 9. a displacement sensor; 10. a normal displacement meter; 11. a backing plate; 12. a pressure-bearing rod; 13. a limit gauge; 14. and shearing the testing device body.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-3, the present utility model provides a technical solution: the utility model provides an in situ soil and structure contact surface shear test device, includes shear test device body 14, be equipped with pressure-bearing pole 12 on the shear test device body 14, the bottom of pressure-bearing pole 12 is equipped with shear plate 6, and shear plate 6's upper surface central authorities are equipped with the screw thread head, pressure-bearing pole 12 perpendicular to shear plate 6's upper surface fixed mounting, and the top outside of pressure-bearing pole 12 is equipped with backing plate 11, backing plate 11 and pressure-bearing pole 12 cooperation installation.
The central top of backing plate 11 is equipped with directional control hole 5, and one side cooperation of directional control hole 5 is equipped with spacing meter 13, and spacing meter 13 perpendicular to backing plate 11 and rotatory ring 4 cooperation installation, and one side of spacing meter 13 is equipped with displacement sensor 9, normal displacement table 10, and displacement sensor 9, normal displacement table 10's bottom and backing plate 11's upper surface are equipped with the cooperation installation piece.
The direction control hole 5 suit is equipped with rotatory ring 4 in the outside of pressure-bearing pole 12, and the top of direction control hole 5 is equipped with torque sensor 8 directly over rotatory ring 4, is equipped with pressure cell 1 directly over torque sensor 8, and pressure cell 1 and the top cooperation installation of pressure-bearing pole 12, the inside cooperation of pressure cell 1 is equipped with weight 7, and the outside of pressure cell 1 is equipped with loading dish 2, adopts connecting rod fixed connection between the outer wall of pressure cell 1 and the loading dish 2.
One side cooperation of torque sensor 8 is equipped with scissors table 3, and torque sensor 8 constitutes shear force measurement system with scissors table 3, and torque sensor can survey the torque value that the in-process that the shearing plate took place to shear bore, through the formula of moment of couple:
M＝∫ 0 R τ×2πR 2 dR
the average shear stress on the contact surface can be calculated as:
the torque sensor 8 and the shear meter 3 form a shear force measuring system, the torque sensor 8 can measure the torque value born by the shearing plate 6 in the shearing process, and the torque value is calculated by a formula of moment of coupleThe contact surface can be calculated the average shear stress on the steel is->The shear gauge 6 can display the reading of the average shear stress on the contact surface of the shear plate and the soil body in real time.
The shear force applying system is composed of a pressure bearing rod 12, a loading disc 2, a shear plate 6 and a base plate 11, the upper part of the loading disc 2 is fixedly connected with a pressure box 1, the lower part of the loading disc 2 is fixedly connected with a torque sensor 8, the lower part of the torque sensor 8 is fixedly connected with the pressure bearing rod 12, a screw hole is formed in the lower part of the pressure bearing rod 12, a screw is fixedly arranged on the upper part of the shear plate 6, the shear plate 6 is connected with the pressure bearing rod 12 through the screw, a direction control hole 5 is formed in the base plate 11, the pressure bearing rod 12 penetrates through the direction control hole 5, the outer diameter of the pressure bearing rod 12 is the same as the inner diameter of the direction control hole 5, the effect of the direction control hole 5 is to ensure that the pressure is borne, the pressure direction transmitted by the pressure is vertically downward, the pressure head can rotate through rotating the loading disc 2, so that the shear plate 6 and a soil body at the lower part are sheared, the base plate 11 is placed at the upper part of a hole, and the upper bearing structure is maintained horizontally and stably.
The pressure box 1, the weights 7, the pressure bearing rods 12 and the shear plates 6 form a normal stress applying system, different normal stresses can be applied to the contact surface of the shear plates 6 and soil bodies by changing the weight of the weights 7 on the upper part of the pressure box 1, the weight of the shear plates 6, the pressure bearing rods 12, the pressure box 1 and other devices can be measured, and the pressure to be applied each time is actually the difference between the dead weight pressure values of the target pressure value subtracting device acting on the soil bodies.
The rotary ring 4, the displacement sensor 9, the normal displacement meter 10 and the limit meter 13 form a normal displacement measurement system, the inner diameter of the rotary ring 4 is the same as the outer diameter of the pressure-bearing rod 12, the upper part of the rotary ring 4 is in contact with the torque sensor 8, the lower part of the rotary ring 4 is in contact with a fixed structure on the pressure-bearing rod 12, therefore, the rotary ring 4 does not displace relative to the pressure-bearing rod 12 in the vertical direction, the rotary ring 4 is connected with the limit meter 13, the limit meter 13 can limit the rotary ring 4 to rotate, therefore, the rotary ring 4 only moves along with the pressure-bearing rod 12 in the vertical direction, the rotary ring 4 is connected with the displacement sensor 9, the displacement sensor 9 can measure the normal displacement of the soil body in the consolidation stage and the shearing stage of applying normal stress, and the normal displacement meter can display the normal displacement reading in real time.
The using method comprises the following steps: firstly, a drilling device is used for drilling, then a pressure-bearing rod 12 passes through a direction control hole 5 to be connected with a backing plate 11, then a shear plate 6 is connected with the pressure-bearing rod 12 through a screw, the backing plate 11 is arranged at the upper part of the hole, the shear plate 6 is arranged in the hole, the shear gauge 3 and the normal displacement gauge 10 are zeroed, a weight 7 is arranged according to a test plan to apply normal stress to a soil body, the soil body is solidified under the action of pressure, the loading disc 2 is rotated after solidification is carried out for a specified time to measure the shear stress on a contact surface, the relationship between the shear stress on the contact surface and the normal stress can be obtained by repeating the normal stress for a plurality of times, and the shear strength parameter on the contact surface of the soil body and the shear plate 6 can be obtained by processing an image.
The shearing test device can realize uniform application of normal stress, determine normal displacement of soil consolidation and shearing stages, avoid the problem that the upper part of the pressing head needs to overcome soil resistance in the lifting process by adopting the traditional lifting shearing test method in a rotary shearing mode, and simulate the shearing of an underground structure and an in-situ soil body of an actual engineering more truly.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. An in-situ soil and structure contact surface shearing test device, including shearing testing device body (14), its characterized in that: the shearing test device is characterized in that a pressure-bearing rod (12) is arranged on the shearing test device body (14), a base plate (11) is arranged outside the upper part of the pressure-bearing rod (12), and the base plate (11) is installed in a matched mode with the pressure-bearing rod (12);
the device is characterized in that a direction control hole (5) is formed in the upper center of the base plate (11), the direction control hole (5) is sleeved outside the pressure-bearing rod (12), a rotary ring (4) is arranged above the direction control hole (5), a torque sensor (8) is arranged right above the rotary ring (4), a pressure box (1) is arranged right above the torque sensor (8), the pressure box (1) is matched with the top end of the pressure-bearing rod (12), weights (7) are matched inside the pressure box (1), a loading disc (2) is arranged outside the pressure box (1), and the outer wall of the pressure box (1) is fixedly connected with the loading disc (2) through a connecting rod;
the bottom end of the pressure-bearing rod (12) is provided with a shear plate (6), the center of the upper surface of the shear plate (6) is provided with a thread head, and the pressure-bearing rod (12) is fixedly arranged perpendicular to the upper surface of the shear plate (6);
one side of the direction control hole (5) is provided with a limit gauge (13) in a matching way, the limit gauge (13) is perpendicular to the backing plate (11) and is matched and installed with the rotary ring (4), a displacement sensor (9) and a normal displacement meter (10) are arranged on one side of the limit gauge (13), and a matched mounting block is arranged at the bottoms of the displacement sensor (9) and the normal displacement meter (10) and the upper surface of the base plate (11);
one side cooperation of torque sensor (8) is equipped with scissors table (3), and torque sensor (8) and scissors table (3) constitute shear force measurement system, and torque sensor can survey the torque value that the in-process that the shearing plate took place to shear bore, through the formula of moment of couple:
M＝∫ 0 R τ×2πR 2 dR
the average shear stress on the contact surface can be calculated as:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321931139.9U CN220751863U (en) | 2023-07-20 | 2023-07-20 | In-situ soil and structure contact surface shearing test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321931139.9U CN220751863U (en) | 2023-07-20 | 2023-07-20 | In-situ soil and structure contact surface shearing test device |
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| Publication Number | Publication Date |
|---|---|
| CN220751863U true CN220751863U (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321931139.9U Active CN220751863U (en) | 2023-07-20 | 2023-07-20 | In-situ soil and structure contact surface shearing test device |
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| CN (1) | CN220751863U (en) |
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2023
- 2023-07-20 CN CN202321931139.9U patent/CN220751863U/en active Active
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