CN113092254A - Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions - Google Patents
Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions Download PDFInfo
- Publication number
- CN113092254A CN113092254A CN202110371984.4A CN202110371984A CN113092254A CN 113092254 A CN113092254 A CN 113092254A CN 202110371984 A CN202110371984 A CN 202110371984A CN 113092254 A CN113092254 A CN 113092254A
- Authority
- CN
- China
- Prior art keywords
- sample
- degrees
- compressive strength
- soil sample
- displacement sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- G01N3/04—Chucks
-
- 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
Abstract
The invention discloses an auxiliary experimental device and method for testing compressive strength of a soil sample under different lateral confinement conditions, and is suitable for the fields of geological engineering and geotechnical engineering. The device is used for geotechnical test equipment does not have the lateral confinement manometer on, and it includes the base, 90 degrees arc lateral walls, the nut, the bolt, displacement sensor, base and every 90 degrees arc lateral walls just can make up and form different lateral confinement conditions through nimble installation and dismantlement, and supplementary strain control formula does not have the lateral confinement manometer, implements the indoor 90 degrees of soil sample compressive strength test, 180 degrees, 270 degrees and 360 degrees vertical compression tests of four kinds of lateral confinement such as lateral confinement, and displacement sensor is directly laid to the face sky face of cylinder soil sample to the vertical or horizontal direction displacement data's of soil body sample real-time collection. The device has the advantages of simple structure, convenient operation, low cost and high practicability, and can realize different tests for simulating four soil body side limit compression working conditions.
Description
Technical Field
The invention relates to an auxiliary experimental device and method, in particular to an auxiliary experimental device and method for testing the compressive strength of a soil sample under different lateral limit conditions, which are suitable for the field of geological engineering and geotechnical engineering.
Background
In underground engineering and foundation pit engineering, the soil body excavation has an empty face, and the different parts have different open face confining pressure states, so that the mechanical properties are different. According to the position of the soil body in natural conditions or engineering excavation, the pressed state can be simplified into four conditions by considering the time change face range and the relative position, and the conditions are as follows: firstly, limiting the compression condition at 90 degrees, such as the soil body at the position of the external corner of a foundation pit; secondly, limiting the compression condition at 180 degrees, such as a soil body on the side wall of the foundation pit; thirdly, 270-degree lateral limited compression conditions, such as soil bodies at the internal corner positions of the foundation pit; fourthly, the lateral limit pressure condition of 360 degrees, such as the un-excavated soil body. The distribution law of stress in soil bodies in the service process is different due to different confining pressures under various pressurized working conditions, and the mechanical properties of the soil bodies are greatly different.
At present, the following indoor and outdoor test methods are generally adopted to realize the research on the deformation and strength of rock-soil mass under various working conditions, and the method I is as follows: in the method, a cylindrical soil sample or a similar material sample is directly placed in a pressurizing bin of a pressure device, and the test is carried out by axially applying load, so that the lateral displacement of the sample is not restricted under the working condition, and finally the sample is compressed and damaged by axial pressurization; the second method comprises the following steps: in a common triaxial compression test, a cylindrical soil sample is placed in a container with hydraulic pressure, and axial pressure is applied after constant confining pressure is applied to the cylindrical soil sample until shearing damage occurs.
At present, the patent of the lateral confinement condition adjustable rock-soil body vertical compression auxiliary test device is difficult to obtain an original-state soil sample under the size due to the design size, particularly a deep soil sample, and only can test and remold the soil sample.
Disclosure of Invention
The invention has the following problems: aiming at the defects of the technology, the auxiliary experimental device and the method have the advantages of simple structure, convenience in operation, low cost, high practicability and low energy consumption, can be used for measuring and recording in real time, and can be used for testing the compressive strength of the soil sample under different lateral limit conditions for simulating four soil lateral limit compression working conditions.
The technical scheme is as follows: the invention relates to an auxiliary experimental device for testing the compressive strength of a soil sample under different lateral limit conditions, which comprises a circular base made of metal, wherein a base clamping ring is arranged on the base, the base snap ring is of a double-ring structure with a hollow middle part, the annular structure above the base snap ring is connected with a cylindrical structure for installing a sample, the cylindrical adjusting structure consists of four 90-degree arc side walls, the bottom of each 90-degree arc side wall is provided with a bolt connected with the base snap ring, the bolt is provided with a nut used for fixing the four 90-degree arc side walls, the tubular structure top is equipped with the biography pressure module, passes the pressure module and includes biography pressure module bottom plate and sets up the biography pressure module cylinder on passing pressure module bottom plate, passes the diameter of pressing the module bottom plate and slightly is less than tubular structure's cavity upper shed, makes to pass and presses the module bottom plate and just in time can contact and place the upper surface at the sample, reciprocates in tubular structure's cavity under the press effect simultaneously.
An inner diameter cavity defined by the 90-degree arc side wall is used for loading a sample, the inner diameter is 53mm, the outer diameter is 60mm, the height is 80 mm-100 mm, and the thickness of the side wall is 8-10 mm; the sample is a standard cylindrical soil sample.
An experimental method of an auxiliary experimental device for testing the compressive strength of a soil sample under different lateral limit conditions comprises the following steps:
a, installing a standard sample directly collected from the field in a cavity of a cylindrical structure, placing an auxiliary experimental device containing the standard sample on an unconfined pressure instrument, arranging a pressure transfer module on the top surface of the sample, and ensuring that the pressure transfer module ensures uniform vertical stress of the sample;
b, removing one or two, three or four continuously arranged 90-degree arc side walls according to the detection requirement, arranging a displacement sensor on the exposed sample face surface after the 90-degree arc side walls are removed, fixing the displacement sensor by using a comparison and measurement table, connecting the displacement sensor with a computer,
c, performing a soil sample compressive strength test on the sample, and performing four lateral limit vertical compression tests of 90 degrees, 180 degrees, 270 degrees, 360 degrees and the like according to the number of continuously dismantled 90-degree arc side walls;
and d, automatically acquiring the vertical or horizontal displacement data of the sample in the test process in real time through a computer connected with the displacement sensor, and further simulating the deformation and mechanical property of the rock-soil body in different service conditions in the field of geotechnical engineering indoors.
The inner diameter of the cylindrical structure cavity is 53mm, the outer diameter is 60mm, the height is 80 mm-100 mm, and the thickness of the side wall is 8-10 mm, so that a standard cylindrical sample can be just placed in the cylindrical structure cavity.
The displacement sensor is an electronic dial indicator, a displacement meter or a laser distance meter which is erected on the comparison and measurement table.
The position of the displacement sensor is manually adjusted to measure the amount of horizontal displacement of the sample under limited pressure on each side.
Advantageous effects
Compared with the prior art, the design scheme of the invention can realize the following beneficial effects:
the device is used for the auxiliary test of the compressive strength of an undisturbed soil sample with unlimited depth and remolded soil under different lateral limit conditions, and the lateral limit conditions of the sample are changed by flexibly disassembling and assembling each 90-degree arc side wall, so that the simulation of different compression working conditions of the soil sample is realized, and the device has the advantages of simple operation and strong practicability; the cavity for loading the test sample and the force transmission device are made of steel, and the precision and the accuracy of a test result can be ensured due to relatively high strength and stability.
Drawings
FIG. 1 is a schematic structural diagram of an auxiliary experimental device for testing compressive strength of a soil sample under different lateral confinement conditions according to the present invention;
FIG. 2 is an isometric view of an auxiliary experimental apparatus for testing the compressive strength of a soil sample under different lateral conditions in accordance with the present invention;
FIG. 3 is a view of the base structure of the present invention;
FIG. 4 is a schematic view of a 90 degree arc sidewall configuration of the present invention;
fig. 5 is a schematic structural diagram of a pressure transfer module connecting a pressure gauge and a sample according to the present invention.
In the figure: 1. a base; 2. a base snap ring; 3. a bolt; 4.90 degree arc sidewall; 5. a pressure transfer module base plate; 6. the pressure transmission module cylinder.
Detailed description of the invention
The invention will be further described with reference to the following examples in which the accompanying drawings are set forth in detail:
as shown in fig. 1 to 5, the auxiliary experimental device for testing the compressive strength of a soil sample under different lateral confinement conditions is characterized in that: the test device comprises a circular base 1 made of metal, wherein a base clamping ring 2 is arranged on the base 1, the base clamping ring 2 is of a double-ring structure with a hollow middle part, a tubular structure used for mounting a sample is connected to an annular structure above the base clamping ring 2, the tubular structure is composed of four 90-degree arc side walls 4, a bolt 3 connected with the base clamping ring 2 is arranged at the bottom of each 90-degree arc side wall 4, a nut used for fixing the four 90-degree arc side walls 4 is arranged on the bolt 3, an inner diameter cavity defined by the 90-degree arc side walls 4 is used for loading the sample, the inner diameter is 53mm, the outer diameter is 60mm, the height is 80 mm-100 mm, and the side wall thickness is 8-10 mm; the sample is a standard cylindrical soil sample; the tubular structure top is equipped with the biography pressure module, passes the pressure module and includes biography pressure module bottom plate 5 and sets up biography pressure module cylinder 6 on passing pressure module bottom plate 5, the diameter that passes pressure module bottom plate 5 slightly is less than tubular structure's cavity upper shed, makes and passes pressure module bottom plate 5 just in time to contact and place the upper surface at the sample to reciprocate in tubular structure's cavity under the press effect.
An auxiliary experiment method for testing the compressive strength of a soil sample under different lateral limit conditions comprises the following steps:
the method comprises the following steps of installing a standard sample directly collected from a field in a cavity of an auxiliary experiment device, wherein the inner diameter of the cavity of the cylindrical structure is 53mm, the outer diameter of the cavity of the cylindrical structure is 60mm, the height of the cavity of the cylindrical structure is 80 mm-100 mm, and the thickness of the side wall of the cavity of the cylindrical structure is 8-10 mm, so that the standard cylindrical sample can be just placed in the cavity of the auxiliary experiment device; arranging a pressure transmission module on the top surface of the sample, and ensuring that the pressure transmission module enables the sample to be stressed uniformly in the vertical direction;
b, removing one or two, three or four continuously arranged 90-degree arc side walls 4 according to detection requirements, arranging a displacement sensor on the exposed sample face surface of the removed 90-degree arc side wall 4, fixing the displacement sensor by using a comparison and measurement table, connecting the displacement sensor with a computer, and manually adjusting the position of the displacement sensor to measure the horizontal displacement of the sample under the limited pressure condition of each side;
c, performing a soil sample compressive strength test on the sample, and performing four lateral limit vertical compression tests of 90 degrees, 180 degrees, 270 degrees, 360 degrees and the like according to the removed 90-degree arc side wall 4;
and d, automatically acquiring the vertical or horizontal displacement data of the sample in the test process in real time through a computer connected with the displacement sensor, and further simulating the deformation and mechanical property of the rock-soil body in different service conditions in the field of geotechnical engineering indoors.
The displacement sensor is an electronic dial indicator, a displacement meter or a laser distance meter which is erected on the comparison and measurement table.
Claims (6)
1. The utility model provides a test soil sample compressive strength's supplementary experimental apparatus under different side limit conditions which characterized in that: the test device comprises a circular base (1) made of metal, wherein a base clamping ring (2) is arranged on the base (1), the base clamping ring (2) is of a double-ring structure with a hollow middle part, an annular structure above the base clamping ring (2) is connected with a tubular structure for mounting a sample, the tubular structure is composed of four 90-degree arc side walls (4), a bolt (3) connected with the base clamping ring (2) is arranged at the bottom of each 90-degree arc side wall (4), nuts used for fixing the four 90-degree arc side walls (4) are arranged on the bolts (3), a pressure transmission module is arranged above the tubular structure and comprises a pressure transmission module bottom plate (6) and a pressure transmission module cylinder (5) arranged on the pressure transmission module bottom plate (6), the diameter of the pressure transmission module bottom plate (6) is slightly smaller than the upper opening of a cavity of the tubular structure, so that the pressure transmission module bottom plate (6) can just contact and be placed on the upper surface of the sample, and simultaneously moves up and down in the cavity of the cylindrical structure under the action of the press machine.
2. The auxiliary experimental device for testing the compressive strength of the soil sample under different lateral limit conditions according to claim 1, which is characterized in that: an inner diameter cavity defined by the 90-degree arc side wall (4) is used for loading a sample, the inner diameter is 53mm, the outer diameter is 60mm, the height is 80 mm-100 mm, and the thickness of the side wall is 8 mm-10 mm; the sample is a standard cylindrical soil sample.
3. A test method of an auxiliary experimental device for testing the compressive strength of a soil sample under different lateral conditions, which is characterized by comprising the following steps:
a, installing a standard sample directly collected from the field in a cavity of a cylindrical structure, placing an auxiliary experimental device containing the standard sample on an unconfined pressure instrument, arranging a pressure transfer module on the top surface of the sample, and ensuring that the pressure transfer module ensures uniform vertical stress of the sample;
b, removing one or two, three or four continuously arranged 90-degree arc side walls (4) according to detection requirements, arranging a displacement sensor on the exposed sample face surface after the 90-degree arc side walls (4) are removed, fixing the displacement sensor by using a comparison and measurement table, and connecting the displacement sensor with a computer;
c, carrying out a soil sample compressive strength test on the sample, and respectively carrying out four lateral limit vertical compression tests of 90 degrees, 180 degrees, 270 degrees, 360 degrees and the like according to the number of continuously dismantled 90-degree arc side walls (4);
and d, automatically acquiring the vertical or horizontal displacement data of the sample in the test process in real time through a computer connected with the displacement sensor, and further simulating the deformation and mechanical property of the rock-soil body in different service conditions in the field of geotechnical engineering indoors.
4. The experimental method according to claim 3, characterized in that: the inner diameter of the cylindrical structure cavity is 53mm, the outer diameter is 60mm, the height is 80 mm-100 mm, and the thickness of the side wall is 8-10 mm, so that a standard cylindrical sample can be just placed in the cylindrical structure cavity.
5. The experimental method according to claim 3, characterized in that: the displacement sensor is an electronic dial indicator, a displacement meter or a laser distance meter which is erected on the comparison and measurement table.
6. The experimental method according to claim 3, characterized in that: the position of the displacement sensor is manually adjusted to measure the amount of horizontal displacement of the sample under limited pressure on each side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110371984.4A CN113092254A (en) | 2021-04-07 | 2021-04-07 | Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110371984.4A CN113092254A (en) | 2021-04-07 | 2021-04-07 | Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113092254A true CN113092254A (en) | 2021-07-09 |
Family
ID=76674442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110371984.4A Pending CN113092254A (en) | 2021-04-07 | 2021-04-07 | Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113092254A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712852A (en) * | 2013-12-30 | 2014-04-09 | 中国矿业大学 | Rock lateral confinement compression resistance experiment sample clamp and experiment method |
| CN103900902A (en) * | 2014-04-16 | 2014-07-02 | 西南科技大学 | Laterally constrained rock uniaxial compression test device |
| CN106989995A (en) * | 2017-06-15 | 2017-07-28 | 东华理工大学 | A kind of adjustable Rock And Soil of lateral spacing condition vertically compresses ancillary test device |
| CN110567429A (en) * | 2019-09-25 | 2019-12-13 | 辽宁工程技术大学 | Device and method for measuring actual Poisson ratio of foundation soil body under lateral limit stress condition |
-
2021
- 2021-04-07 CN CN202110371984.4A patent/CN113092254A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712852A (en) * | 2013-12-30 | 2014-04-09 | 中国矿业大学 | Rock lateral confinement compression resistance experiment sample clamp and experiment method |
| CN103900902A (en) * | 2014-04-16 | 2014-07-02 | 西南科技大学 | Laterally constrained rock uniaxial compression test device |
| CN106989995A (en) * | 2017-06-15 | 2017-07-28 | 东华理工大学 | A kind of adjustable Rock And Soil of lateral spacing condition vertically compresses ancillary test device |
| CN110567429A (en) * | 2019-09-25 | 2019-12-13 | 辽宁工程技术大学 | Device and method for measuring actual Poisson ratio of foundation soil body under lateral limit stress condition |
Non-Patent Citations (1)
| Title |
|---|
| 杨庆光等: "《土力学》", 31 March 2017, 中国建材工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106644758B (en) | Rock direct shear and point load test device and test operation method thereof | |
| CN102967506B (en) | Middle-sized rock servo control true triaxial test device | |
| CN201397262Y (en) | Earthwork sample preparing instrument | |
| CN102809641B (en) | Undisturbed soil sample expansion force testing device capable of controlling saturation | |
| CN103698493A (en) | Multiscale macroscopic-microscopic tester for rock and soil materials under multi-field coupling | |
| CN107907589A (en) | Three axis acoustical testing system of high pressure | |
| CN201503375U (en) | Radial loading and testing investment of drilling jack | |
| CN206906375U (en) | A kind of device for measuring soil solidifying performance and expansive force | |
| CN203630131U (en) | Soil layer settlement tester | |
| CN206818523U (en) | A kind of coefficient of collapsibility of loess is layered in-situ testing device | |
| CN113092254A (en) | Auxiliary experiment device and method for testing compressive strength of soil sample under different side limit conditions | |
| CN108519257B (en) | Method and device for preparing root-containing soil sample and detecting shear strength | |
| CN212340125U (en) | Thickness gauge capable of measuring thickness values of automobile parts under different pressures | |
| CN202886200U (en) | Medium-sized rock-servo-controlled true triaxial test device | |
| CN205898797U (en) | Simulation train moves and carries testing arrangement of soil deformation characteristic down | |
| CN205280456U (en) | Soil sample compaction test makes instrument on coarse soil furface layer | |
| CN107422097A (en) | A kind of device for measuring soil solidifying performance and expansive force | |
| CN207689276U (en) | A kind of equidistance line marking device for concrete cylindrical sample strain testing | |
| Voyiadjis et al. | Preparation of large-size cohesive specimens for calibration chamber testing | |
| CN203738973U (en) | Combined die for molding standard test piece for geotechnical test | |
| RU85167U1 (en) | THREE-COMPRESSION DEVICE | |
| CN213749367U (en) | Fixing device of test block of springback strength measurement curve | |
| CN206208671U (en) | A kind of rock staight scissors and Point Load Tests device | |
| CN208109581U (en) | A kind of pair of native unit applies the experimental rig of different constraints | |
| CN110044686B (en) | Portable triaxial stress-strain testing device loaded by counter-force |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |