Sand soil solidification strength test device capable of carrying out comparison and reference

Abstract

The utility model relates to the technical field of sand solidification strength test, in particular to a sand solidification strength test device capable of performing comparison reference, which comprises a bottom cylinder, a turntable and a vertical prism, a test cylinder is detachably inserted in the top surface of the turntable at the position matched with each edge of the vertical prism, and a compression ring is longitudinally arranged in each test cylinder in a sliding manner; and an injection assembly longitudinally penetrates through the compression ring in a sliding manner. Sandy soil solidification environments with different relative densities are simulated by adjusting the longitudinal position of the compression ring, and the influence of reaction liquid injected at different depths on the sandy soil fixation strength is researched by controlling the depth of the injection assembly inserted into the test cylinder. Meanwhile, different reaction liquids can be injected into the test cylinder to research the influence of different microbial additives on the sandy soil fixing strength, in a single test, regulation and control of different variables are completed, repeated tests are avoided, the test time is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand soil solidification strength test, in particular to a sand soil solidification strength test device capable of performing comparative reference. Background Art

[0002] Microbial-induced calcium carbonate precipitation is an emerging and promising soil solidification method with the characteristics of environmental sustainability, low energy consumption and low pollution. It combines practicality, economy, safety and environmental protection. Based on the experimental conditions for optimizing the existing microbial growth characteristics, the effects of adding admixtures and basalt fiber to sand on microbial solidification of sand were explored; the optimal incorporation method of admixtures and basalt fiber was explored to improve the toughness of foundation soil. A series of macroscopic tests were carried out on coarse sand samples before and after solidification, and the relationship between calcium carbonate content and indicators such as solidification rate, unconfined compressive strength, and permeability coefficient was analyzed based on the macroscopic test results; representative coarse sand samples were selected for microscopic test and detection, and the changes in calcium carbonate precipitation were studied; finally, from the macroscopic and microscopic perspectives, a comprehensive analysis was conducted on the influence mechanism of the dosage of admixtures, basalt fiber, and microorganisms on the mechanical properties of sand to provide data reference and scientific basis for practical engineering applications.

[0003] In existing strength testing devices for sand solidification, the effect of microorganisms on solidified sand is often verified by adding different microbial additives. At the same time, the penetration effect of microbial additives can be studied by adjusting the relative density of the sand itself. However, existing test devices often lack the necessary comparative references. Since different microbial additives need to be added and the relative density of the sand itself needs to be adjusted during the test, multiple tests need to be repeated, which not only prolongs the test time but also reduces the test efficiency.

[0004] Therefore, it is necessary to invent a sand solidification strength test device that can be used for comparative reference to solve the above problems. Utility Model Content

[0005] In order to address the shortcomings of the existing technology, the purpose of the utility model is to provide a strength testing device for sand solidification that can be used for comparative reference, which solves the problem that the existing technology often lacks the necessary comparative reference. However, since different microbial additives need to be added and the relative density of the sand itself needs to be regulated during the test, multiple tests need to be repeated, which not only prolongs the test time but also reduces the test efficiency.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A strength test device for sand solidification that can be used for comparison and reference, comprising a bottom cylinder, a turntable rotatably arranged in the bottom cylinder, and a vertical prism installed at the center of the top surface of the turntable. The top surface of the turntable is adapted to the vertical prism and a test cylinder can be detachably inserted at each edge position. A pressure ring that can compress the density of the sand in the test cylinder is longitudinally slidably arranged in each test cylinder. The sliding distances of the multiple pressure rings are controllable and do not interfere with each other. An injection component that can inject a reaction liquid into the test cylinder is longitudinally slidably penetrated in the pressure ring. The longitudinal sliding distances of the multiple injection components are controllable and do not interfere with each other.

[0008] As a preferred solution of the present invention, a vertical rail can be detachably installed at each edge of the vertical prism, an L-shaped connecting frame is provided at the center of the top of the pressure ring, and a lower sliding seat that can slide longitudinally along the vertical rail is installed at the other end of the L-shaped connecting frame.

[0009] As a preferred solution of the present invention, the injection assembly includes an L-shaped liquid inlet tube and a liquid outlet conduit installed at the bottom end of the L-shaped liquid inlet tube. The L-shaped liquid inlet tube slides longitudinally through the center of the pressure ring. The L-shaped liquid inlet tube slides longitudinally through the vertical part of the L-shaped connecting frame and extends upward to above the L-shaped connecting frame, and the liquid outlet conduit is located below the pressure ring.

[0010] As a preferred solution of the present invention, the top of the test cylinder is detachably abutted against a cylinder cover, the vertical part of the L-shaped connecting frame is longitudinally slid through the center of the cylinder cover, and a feeding pipe for conveying sand and soil into the test cylinder is installed on the side wall of the test cylinder.

[0011] As a preferred solution of the present invention, the horizontal portion of the liquid inlet L-shaped tube is detachably sleeved with a clamping ring, a fixing frame is installed on the side wall of the clamping ring, and an upper slide seat that can slide longitudinally along the vertical rail is installed on the other end of the fixing frame.

[0012] As a preferred solution of the present invention, the turntable is detachably connected with multiple positioning studs, the threaded sleeve of the positioning stud located below the turntable is provided with a positioning nut, the top of the positioning stud is installed with an insert tube, and the bottom of the test tube is installed with a stud that is detachably inserted into the insert tube.

[0013] As a preferred solution of the present invention, a driving member is detachably installed at the center of the bottom end of the bottom cylinder, a connecting plate is installed at the rotation output end of the driving member, the connecting plate is detachably connected to the turntable, an annular guide rail is installed on the inner circumferential side wall of the bottom cylinder, and a plurality of annular slides that can slide in a circle along the annular guide rail are installed on the circumferential side wall of the turntable.

[0014] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0015] In the present invention, by changing the longitudinal position of the pressure ring in the test cylinder, the sand space below the pressure ring in the test cylinder is compressed, that is, the compression amount of the sand space is changed, and the relative density of the sand is changed, so that the sand solidification environment of different relative densities is simulated in a single test process; at the same time, by changing the longitudinal position of the injection component, the depth of the injection component inserted into the test cylinder can be changed to study the influence of the injection of reaction liquid at different depths on the fixing strength of the sand, and different reaction liquids can be injected into the test cylinder through the injection component to study the influence of different microbial additives on the fixing strength of the sand. Finally, the longitudinal position of the pressure ring is adjusted to simulate the sand solidification environment of different relative densities, and the depth of the injection component inserted into the test cylinder can be controlled to study the influence of the injection of reaction liquid at different depths on the fixing strength of the sand. At the same time, different reaction liquids can be injected into the test cylinder to study the influence of different microbial additives on the fixing strength of the sand. In a single test, the regulation of different variables is completed, avoiding the need to repeat multiple tests, shortening the test time, and improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the front plan view structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the planar top view structure of the utility model;

[0019] Figure 4 For this utility model Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle.

[0020] Description of reference numerals:

[0021] 1. Base cylinder; 2. Driving part; 3. Connecting plate; 4. Turntable; 5. Annular guide rail; 6. Annular slide; 7. Vertical prism; 8. Positioning stud; 9. Positioning nut; 10. Test cylinder; 11. Cylinder cover; 12. Vertical rail; 13. Lower slide seat; 14. Upper slide seat; 15. Feed pipe; 16. L-shaped connecting frame; 17. Pressing ring; 18. Liquid inlet L-shaped pipe; 19. Liquid outlet conduit; 20. Snap ring; 21. Fixing frame; 22. Insert cylinder; 23. Insert column. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] The utility model provides Figures 1-4The strength test device for sand solidification shown in the figure, which can be used for comparative reference, includes a bottom cylinder 1, a turntable 4 rotatably arranged in the bottom cylinder 1, and a vertical prism 7 installed in the center of the top surface of the turntable 4. The top surface of the turntable 4 is adapted to the vertical prism 7, and a test cylinder 10 can be detachably inserted at each edge position, and each test cylinder 10 is provided with a longitudinally sliding pressure ring 17 that can compress the density of the sand in the test cylinder 10. The sliding distances of the multiple pressure rings 17 are controllable and do not interfere with each other. An injection component that can inject a reaction liquid into the test cylinder 10 is longitudinally slid through the pressure ring 17. The longitudinal sliding distances of the multiple injection components are controllable and do not interfere with each other. The cross-sectional shape of the vertical prism 7 can be a quadrilateral, a hexagon or an octagon, that is, the corresponding number of test cylinders 10 can be four, six or eight, thereby flexibly adjusting the number of comparative references of the test cylinders 10.

[0024] A vertical rail 12 can be detachably installed at each edge of the vertical prism 7, and an L-shaped connecting frame 16 is provided at the top center of the pressure ring 17. A lower sliding seat 13 that can slide longitudinally along the vertical rail 12 is installed at the other end of the L-shaped connecting frame 16. The lower sliding seat 13 slides longitudinally along the vertical rail 12, thereby changing the longitudinal position of the pressure ring 17 in the test cylinder 10, and then compressing the sand and soil space below the pressure ring 17 in the test cylinder 10, that is, changing the compression amount of the sand and soil space.

[0025] The injection assembly includes an L-shaped liquid inlet tube 18 and a liquid outlet conduit 19 installed at the bottom end of the L-shaped liquid inlet tube 18. The L-shaped liquid inlet tube 18 slides longitudinally through the center of the pressure ring 17. The L-shaped liquid inlet tube 18 slides longitudinally through the vertical part of the L-shaped connecting frame 16 and extends upward to the top of the L-shaped connecting frame 16. The liquid outlet conduit 19 is located below the pressure ring 17. By changing the longitudinal depth of the liquid inlet L-shaped tube 18 passing through the pressure ring 17, the depth of the injection assembly inserted into the test cylinder 10 is changed to study the effect of injecting reaction liquid at different depths on the fixing strength of sand.

[0026] The top of the test cylinder 10 is detachably abutted against a cylinder cover 11, and the vertical part of the L-shaped connecting frame 16 is longitudinally slidable and penetrates the center of the cylinder cover 11. A feeding pipe 15 for conveying sand and soil into the test cylinder 10 is installed on the side wall of the test cylinder 10. When the pressure ring 17 slides longitudinally to the top, the feeding port of the feeding pipe 15 is completely located under the pressure ring 17, preventing the pressure ring 17 from affecting the feeding of the feeding pipe 15.

[0027] The horizontal portion of the liquid inlet L-shaped tube 18 is detachably sleeved with a clamping ring 20, and a fixing frame 21 is installed on the side wall of the clamping ring 20. The other end of the fixing frame 21 is installed with an upper slide 14 that can slide longitudinally along the vertical rail 12. By changing the longitudinal sliding distance of the upper slide 14 along the vertical rail 12, the depth of the liquid inlet L-shaped tube 18 passing through the pressure ring 17 can be changed.

[0028] The turntable 4 is detachably connected with a plurality of positioning studs 8, and the threaded sleeve of the positioning studs 8 located below the turntable 4 is provided with a positioning nut 9, an insert tube 22 is installed on the top of the positioning stud 8, and a plug column 23 detachably inserted into the insert tube 22 is installed on the bottom end of the test tube 10. A driving member 2 is detachably installed on the bottom center of the bottom end of the bottom tube 1, and a connecting plate 3 is installed on the rotation output end of the driving member 2. The connecting plate 3 is detachably connected to the turntable 4, and an annular guide rail 5 is installed on the inner peripheral side wall of the bottom tube 1. A plurality of annular slides 6 that can slide in a circle along the annular guide rail 5 are installed on the peripheral side wall of the turntable 4. The driving member 2 drives the connecting plate 3 to rotate, that is, drives the turntable 4 to rotate, thereby simulating complex stress paths such as the rotation of the principal stress.

[0029] In the present invention, by changing the longitudinal position of the pressure ring 17 in the test cylinder 10, the sand space below the pressure ring 17 in the test cylinder 10 is compressed, that is, the compression amount of the sand space is changed, and the relative density of the sand is changed, so as to simulate the sand solidification environment of different relative densities in a single test process; at the same time, by changing the longitudinal position of the injection assembly, the depth of the injection assembly inserted into the test cylinder 10 can be changed to study the effect of injecting the reaction liquid at different depths on the sand fixation strength, and different reaction liquids can be injected into the test cylinder 10 through the injection assembly to study the effect of different microbial additives on the sand fixation strength. Finally, by adjusting the longitudinal position of the pressure ring 17, the sand solidification environment of different relative densities can be simulated, and by controlling the depth of the injection assembly inserted into the test cylinder 10 to study the effect of injecting the reaction liquid at different depths on the sand fixation strength, different reaction liquids can be injected into the test cylinder 10 to study the effect of different microbial additives on the sand fixation strength. In a single test, the regulation of different variables is completed, avoiding the need to repeat multiple tests, shortening the test time, and improving the test efficiency.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sand and soil solidification strength test device capable of performing comparative reference, characterized in that: The invention comprises a bottom cylinder (1), a turntable (4) rotatably arranged in the bottom cylinder (1), and a vertical prism (7) installed at the center of the top surface of the turntable (4); a test cylinder (10) is detachably inserted at each edge position of the vertical prism (7) adapted to the top surface of the turntable (4); a pressure ring (17) capable of compressing the density of the sand in the test cylinder (10) is longitudinally slidably arranged in each test cylinder (10); the sliding distances of the plurality of pressure rings (17) are controllable and do not interfere with each other; an injection assembly capable of injecting a reaction liquid into the test cylinder (10) is longitudinally slidably penetrated in the pressure ring (17); the longitudinal sliding distances of the plurality of injection assemblies are controllable and do not interfere with each other.

2. A sand and soil solidification strength testing device capable of performing comparative reference according to claim 1, characterized in that: A vertical rail (12) is detachably mounted on each edge of the vertical prism (7), an L-shaped connecting frame (16) is provided at the center of the top end of the pressure ring (17), and a lower slide seat (13) that can slide longitudinally along the vertical rail (12) is installed at the other end of the L-shaped connecting frame (16).

3. A sand and soil solidification strength testing device capable of performing comparative reference according to claim 2, characterized in that: The injection assembly includes a liquid inlet L-shaped tube (18) and a liquid outlet conduit (19) installed at the bottom end of the liquid inlet L-shaped tube (18), wherein the liquid inlet L-shaped tube (18) slides longitudinally through the center of the pressure ring (17), and the liquid inlet L-shaped tube (18) slides longitudinally through the vertical portion of the L-shaped connecting frame (16) and extends upward to the top of the L-shaped connecting frame (16), and the liquid outlet conduit (19) is located below the pressure ring (17).

4. The sand and soil solidification strength testing device capable of comparison and reference according to claim 2, characterized in that: The top of the test cylinder (10) is detachably abutted against a cylinder cover (11), the vertical portion of the L-shaped connecting frame (16) is longitudinally slidably penetrated through the center of the cylinder cover (11), and a feeding pipe (15) for conveying sand and soil into the test cylinder (10) is installed on the side wall of the test cylinder (10).

5. The sand and soil solidification strength testing device capable of comparison and reference according to claim 3, characterized in that: The horizontal portion of the liquid inlet L-shaped tube (18) is detachably sleeved with a clamping ring (20), a fixing frame (21) is installed around the side wall of the clamping ring (20), and an upper slide seat (14) that can slide longitudinally along the vertical rail (12) is installed at the other end of the fixing frame (21).

6. The sand and soil solidification strength testing device capable of comparison and reference according to claim 1, characterized in that: The turntable (4) is detachably plugged with a plurality of positioning studs (8), the threaded sleeve of the positioning studs (8) located below the turntable (4) is provided with a positioning nut (9), the top of the positioning studs (8) is installed with an insert (22), and the bottom of the test tube (10) is installed with an insert (23) that is detachably plugged into the insert (22).

7. The sand and soil solidification strength testing device capable of comparison and reference according to claim 1, characterized in that: A driving member (2) is detachably mounted at the center of the bottom end of the bottom cylinder (1), a connecting plate (3) is mounted on the rotation output end of the driving member (2), and the connecting plate (3) is detachably connected to the turntable (4). An annular guide rail (5) is mounted on the inner peripheral side wall of the bottom cylinder (1), and a plurality of annular slide seats (6) that can slide in an annular manner along the annular guide rail (5) are mounted on the peripheral side wall of the turntable (4).

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