Triaxial sample preparation device for sludge-sand mixed soil

Abstract

The utility model discloses a triaxial sample preparation device for sludge-sand mixed soil. The triaxial sample preparation device comprises a consolidation container, a rack, a force transmission mechanism, a mounting plate assembly, a pressure sensor, a pushing device and a dial indicator, the rack comprises stand columns, lifting plates and a fixing base, the stand columns are vertically installed at the left end and the right end of the fixing base, and the lifting plates are slidably installed on the stand columns on the two sides. The installation plate assembly is fixedly installed at the upper end of the stand column, the force transmission mechanism is vertically installed in the middle of the installation plate assembly, the bottom end of the force transmission mechanism is connected with the pressure sensor, the consolidation container is arranged between the force transmission mechanism and the lifting plate, the pushing device is fixedly installed at the top of the fixing base, and the upper end of the pushing device abuts against the lifting plate. The bottom of the lifting plate abuts against the lifting plate. And the pressure sensor and the pushing device are electrically connected with an external control system. According to the device, moisture and gas in the sludge-sand mixed soil can be effectively discharged, a sample is effectively prevented from being broken, and the sample is favorably formed.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering soil tests, in particular to a triaxial specimen preparation device for silt-sand mixed soil. Background Technique

[0002] At present, after the silt-sand mixed soil waste formed by port dredging is filled into the storage yard, soft soil foundation treatment is carried out to improve the deformation resistance and bearing capacity of the filled soil, and then it is further used as the filler for the underlying soil layer of the coastal geotechnical building foundation, which is an important way to solve the shortage of land resources and high-quality fillers, and has the advantages of cost reduction, people's livelihood benefit and resource conservation, and is a design scheme that conforms to the basic national conditions. However, due to the influence of the original offshore soil layer and the filling process, the filling is often a sand-clay mixture.

[0003] Due to the existence of inert components such as sand with larger particle sizes, the structural skeleton form of the mixed soil is inevitably changed, the microscopic pore structure of the silt-sand mixture is affected, resulting in significant differences in the physical and mechanical properties of the silt-sand mixture foundation soil and the macro-micro mechanical properties of pure clay. Measuring the strength characteristics of the silt-sand mixture is an urgent need in engineering.

[0004] Due to the high water content characteristics of silt, it is difficult to form specimens during specimen preparation. Therefore, there is an urgent need to develop a triaxial specimen preparation device that can be used for silt-sand mixed soil. Content of the Utility Model

[0005] To solve the above problems, the utility model provides a triaxial specimen preparation device for silt-sand mixed soil.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the utility model is as follows:

[0007] A triaxial specimen preparation device for silt-sand mixed soil includes: a consolidation container, a frame, a force transmission mechanism, a mounting plate assembly, a pressure sensor, a pushing device and a dial gauge; the frame includes columns, a lifting plate and a fixed seat, the columns are vertically installed at the left and right ends of the fixed seat, and the lifting plate is slidably installed on the two side columns;

[0008] The mounting plate assembly is fixedly installed at the upper end of the column, the force transmission mechanism is vertically installed in the middle of the mounting plate assembly, the bottom end of the force transmission mechanism is connected to the pressure sensor, the consolidation container is arranged between the force transmission mechanism and the lifting plate, the pushing device is fixedly installed on the top of the fixed seat, and its upper end abuts against the lifting plate for driving the lifting plate to lift, and the dial gauge is detachably installed on the column, and its bottom abuts against the lifting plate for measuring the displacement of the lifting plate;

[0009] The pressure sensor, the pushing device and the external control system are electrically connected.

[0010] As a possible implementation, further, the consolidation container includes:

[0011] A consolidation container base for discharging gas and water in the soil sample;

[0012] A sample preparation mold disposed on the top of the consolidation container base for loading the soil sample;

[0013] A clamping assembly installed on the consolidation container base for clamping and fixing the sample preparation mold on the consolidation container base;

[0014] A first permeable stone installed in the sample preparation mold above the soil sample for discharging gas and water in the soil sample;

[0015] A pressure rod, the upper end of which abuts against the pressure sensor and the lower end abuts against the first permeable stone, for applying pressure to the soil sample in the sample preparation mold.

[0016] As a possible implementation, further, the consolidation container base includes a drain valve, a second permeable stone, a consolidator base, and air and water guiding holes. A groove for installing the second permeable stone is formed in the middle of the consolidator base. The second permeable stone is installed in the groove, and air and water guiding holes are formed in the side wall of the groove. The drain valve is communicated with the air and water guiding holes for discharging gas and water in the soil sample.

[0017] As a possible implementation, further, the clamping assembly includes a fixed rod, a fixing plate, and a nut. The lower end of the fixed rod is fixedly installed at both ends of the top of the consolidator base. The upper end of the fixed rod is provided with an external thread. The fixing plate is slidably installed on both fixed rods. A through hole is formed in the middle of the fixing plate, and the size of the through hole is larger than the inner diameter of the sample preparation mold. The nut is threadedly connected to the upper end of the fixed rod to apply pressure to the fixing plate, so that the sample preparation mold is clamped and fixed between the fixing plate and the consolidation container base.

[0018] As a possible implementation, further, a magnet is provided on the side wall of the dial indicator, the column is made of steel, and the dial indicator is installed on the column by magnetic attraction.

[0019] As a possible implementation, further, clamping grooves for aligning the sample preparation mold are provided at the bottom of the fixing plate and the top of the consolidator base, and both ends of the sample preparation mold are clamped in the upper and lower clamping grooves;

[0020] When both ends of the sample preparation mold are clamped in the upper and lower clamping grooves, the upper opening of the sample preparation mold is aligned with the through hole in the middle of the fixing plate, and the second permeable stone completely covers the lower opening of the sample preparation mold.

[0021] As a possible implementation, further, the mounting plate assembly includes a top plate and nuts. The upper end of the column is provided with an external thread. The top plate is slidably mounted on the two columns. Two groups of nuts are respectively threadedly connected to the upper ends of the columns. The two groups of nuts are respectively located at the upper and lower ends of the top plate to clamp and fix the top plate.

[0022] As a possible implementation, further, the force transmission mechanism includes an adjusting nut and a threaded rod. A circular hole for avoiding the threaded rod is opened in the middle of the top plate. The threaded rod passes through the circular hole. Adjusting nuts are respectively threadedly connected to both ends of the threaded rod. The adjusting nuts are clamped on both sides of the top plate to limit and fix the threaded rod.

[0023] As a possible implementation, further, the pressing rod includes a force transmission rod and a loading head. Loading heads are respectively connected to both ends of the force transmission rod. The loading head and the sample preparation mold are in clearance fit.

[0024] As a possible implementation, further, the inner diameter of the sample preparation mold is 39.1 mm and the height is 200 mm.

[0025] Adopting the above technical solution, compared with the prior art, the beneficial effects of the present utility model are as follows:

[0026] The triaxial sample preparation device for silt-sand mixed soil provided by the present utility model can effectively discharge the moisture and gas in the silt-sand mixed soil, effectively avoid the sample from breaking, facilitate the forming of the sample, lay a solid foundation for the strength research of sandy clay mixed soil, and provide scientific and technological support for the soft soil foundation treatment in coastal areas, and is suitable for further popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0029] Figure 2 It is a schematic diagram of the structure of the consolidation container in the present utility model;

[0030] Figure 3 It is a schematic diagram of the structure of the pressing rod in the present utility model.

[0031] The reference numerals and names in the drawings are as follows:

[0032] Consolidation container - 1; Frame - 2; Force transmission mechanism - 3; Mounting plate assembly - 4; Pressure sensor - 5; Pushing device - 6; Dial indicator - 7; Specimen preparation mold - 11; Consolidation container base - 12; Clamping assembly - 13; Pressing rod - 14; First permeable stone - 15; Column - 21; Lifting plate - 22; Fixed seat - 23; Adjusting nut - 31; Threaded rod - 32; Top plate - 41; Nut - 42; Drain valve - 121; Second permeable stone - 122; Consolidator base - 123; Air and water guiding hole - 124; Fixed rod - 131; Fixed plate - 132; Nut - 133; Force transmission rod - 141; Loading head - 142. Detailed implementation manners

[0033] To make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model. Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0034] Referring to the Figure 1 As shown, this embodiment provides a triaxial specimen preparation device for silt - sand mixed soil, including: a consolidation container 1, a frame 2, a force transmission mechanism 3, a mounting plate assembly 4, a pressure sensor 5, a pushing device 6 and a dial indicator 7; The frame 2 includes columns 21, a lifting plate 22 and a fixed seat 23. The columns 21 are vertically installed at the left and right ends of the fixed seat 23, and the lifting plate 22 is slidably installed on the two - side columns 21;

[0035] The mounting plate assembly 4 is fixedly installed at the upper end of the column 21. The force transmission mechanism 3 is vertically installed in the middle of the mounting plate assembly 4. The bottom end of the force transmission mechanism 3 is connected to the pressure sensor 5. The consolidation container 1 is arranged between the force transmission mechanism 3 and the lifting plate 22. The pushing device 6 is fixedly installed at the top of the fixed seat 23, and its upper end abuts against the lifting plate 22, and is used to drive the lifting plate 22 to lift. When the pushing device 6 pushes the lifting plate 22 upward, the force transmission mechanism 3 loads the soil sample inside the consolidation container 1 through the pressure sensor 5 to realize the pressing of the soil sample. The dial indicator 7 is detachably installed on the column 21, and its bottom abuts against the lifting plate 22, and is used to measure the displacement of the lifting plate 22. In this embodiment, a magnet is arranged on the side wall of the dial indicator 7, the column 21 is a steel part, and the dial indicator 7 is installed on the column 21 by magnetic attraction.

[0036] The pressure sensor 5 and the pushing device 6 are electrically connected to an external control system. In this embodiment, the external control system selects a computer. During use, the loading pressure of the consolidation container 1 is read through the pressure sensor 5, and the computer adjusts the loading pressure by adjusting the telescopic amount of the pushing device 6. In this embodiment, the pushing device 6 can select a hydraulic telescopic rod, an electro-hydraulic push rod, etc.

[0037] Refer to the appendix Figure 2 As shown, the consolidation container 1 includes:

[0038] The consolidation container base 12, which is used for the discharge of gas and water in the soil sample; wherein, the consolidation container base 12 includes a drain valve 121, a second permeable stone 122, a consolidator base 123 and a gas and water guiding hole 124. A groove for installing the second permeable stone 122 is formed in the middle of the consolidator base 123. The second permeable stone 122 is installed in the groove, and gas and water guiding holes 124 are formed in the side wall of the groove. The drain valve 121 is communicated with the gas and water guiding holes 124 and is used for the discharge of gas and water in the soil sample. After the soil sample is compressed, the gas and water in the soil sample enter the gas and water guiding holes 124 on the side wall of the groove through the second permeable stone 122, and the water and gas in the gas and water guiding holes 124 are discharged by the drain valve 121.

[0039] The sample preparation mold 11 is arranged on the top of the consolidation container base 12 and is used for loading the soil sample; in this embodiment, the sample preparation mold 11 is in a hollow tubular shape, the inner diameter of the sample preparation mold 11 is 39.1 mm, and the height is 200 mm.

[0040] The clamping assembly 13 is installed on the consolidated container base 12 and is used to clamp and fix the sample preparation mold 11 on the consolidated container base 12. Among them, the clamping assembly 13 includes a fixed rod 131, a fixed plate 132, and a nut 133. The lower end of the fixed rod 131 is fixedly installed at both ends of the top of the consolidator base 123. The upper end of the fixed rod 131 is provided with an external thread. The fixed plate 132 is slidably installed on the two fixed rods 131. A through hole is opened in the middle of the fixed plate 132, and the size of the through hole is larger than the inner diameter of the sample preparation mold 11. The nut 133 is threadedly connected to the upper end of the fixed rod 131 to press the fixed plate 132, so that the sample preparation mold 11 is clamped and fixed between the fixed plate 132 and the consolidated container base 12. Further, a gasket is provided between the nut 133 and the fixed plate 132, and the gasket is sleeved on the fixed rod 131. During use, the sample preparation mold 11 is placed on the consolidated container base 12, then the fixed plate 132 is sleeved on the fixed rod 131, and then the nut 133 is screwed in and locked to clamp and fix the sample preparation mold 11.

[0041] In this embodiment, clamping grooves for aligning the sample preparation mold 11 are provided at the bottom of the fixed plate 132 and the top of the consolidator base 123. Both ends of the sample preparation mold 11 are clamped in the upper and lower clamping grooves; when both ends of the sample preparation mold 11 are clamped in the upper and lower clamping grooves, the upper opening of the sample preparation mold 11 is aligned with the through hole in the middle of the fixed plate 132, and the second permeable stone 122 completely covers the lower opening of the sample preparation mold 11, so as to realize the alignment of the sample preparation mold 11.

[0042] The first permeable stone 15 is installed in the sample preparation mold 11 and is located above the soil sample, and is used for discharging gas and water in the soil sample; among them, the first permeable stone 15 and the sample preparation mold 11 are in clearance fit.

[0043] The pressing rod 14, its upper end abuts against the pressure sensor 5, and its lower end abuts against the first permeable stone 15, and is used to apply pressure to the soil sample in the sample preparation mold 11. In this embodiment, the pressing rod 14 includes a force transmission rod 141 and a loading head 142. Loading heads 142 are respectively connected to both ends of the force transmission rod 141, and the loading heads 142 and the sample preparation mold 11 are in clearance fit.

[0044] When the consolidation container 1 is used, first open the drain valve 121 on the consolidated container base 12, and then sequentially put the second permeable stone 122, filter paper, soil sample, filter paper, and the first permeable stone 15 into the sample preparation mold 11; among them, the soil sample is poured into the sample preparation mold 11 in multiple times, and each time it is poured, it is vibrated; then the pressing rod 14 is installed.

[0045] When making a compaction sample, place the consolidation container 1 filled with soil samples on the lifting plate 22, and then push the lifting plate 22 to rise through the pushing device 6. The pressing rod 14 pushes the first permeable stone 15 to extrude the soil samples in the sample-making mold 11. The water and gas in the soil samples are discharged from the soil samples through the permeable stones. The water and gas below the consolidation container 1 enter the air and water guiding holes 124 on the side wall of the groove through the second permeable stone 122, and the water and gas in the air and water guiding holes 124 are then discharged by the drain valve 121. This device can effectively discharge the water and gas in the silt-sand mixed soil, effectively avoid the fracture of the sample, and facilitate the formation of the sample.

[0046] After the sample making is completed, control the pushing device 6 to retract. Then remove the consolidation container 1, then unscrew the nut 133 and pull out the fixing plate 132, take out the sample-making mold 11 on the consolidation container base 12, and finally push the pressing rod 14 into the sample-making mold 11. Use the pressing rod 14 to apply pressure to the soil samples in the sample-making mold 11, and push out the compacted soil samples from the sample-making mold 11.

[0047] Furthermore, in this embodiment, the soil samples are pressed in a step-by-step manner. Specifically, the soil samples are pressed step by step according to 0.5 kPa, 1.5 kPa, 3.125 kPa, 6.25 kPa, 12.5 kPa, and 25 kPa. During the pressurization, the displacement of the consolidation container 1 is read through the dial gauge 7. When the displacement of the consolidation container 1 (the settlement of the soil samples) is basically unchanged or the change amount is less than the set value, continue to apply the next-level load.

[0048] In this embodiment, the mounting plate assembly 4 includes a top plate 41 and nuts 42. The upper ends of the columns 21 are provided with external threads. The top plate 41 is slidably mounted on the two side columns 21. Two groups of nuts 42 are respectively threadedly connected to the upper ends of the columns 21. The two groups of nuts 42 are respectively located at the upper and lower ends of the top plate 41 to clamp and fix the top plate 41. When in use, adjust the height and levelness of the top plate 41 through the two side nuts 42 and measure with a bubble level to make the top plate 41 in a horizontal state.

[0049] In this embodiment, the force transmission mechanism 3 includes an adjusting nut 31 and a threaded rod 32. A circular hole for avoiding the threaded rod 32 is opened in the middle of the top plate 41. The threaded rod 32 passes through the circular hole. The two ends of the threaded rod 32 are respectively threadedly connected with adjusting nuts 31. The adjusting nuts 31 are clamped on both sides of the top plate 41 to limit and fix the threaded rod 32. When in use, place a pressure sensor 5 between the force transmission mechanism 3 and the pressing rod 14, and adjust the adjusting nut 31 to lower the threaded rod 32 so that the upper and lower ends of the pressure sensor 5 are respectively abutted against the threaded rod 32 and the pressing rod 14.

[0050] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A triaxial specimen preparation device for silt-sand mixed soil, characterized in that, Comprising: A consolidation container (1), a frame (2), a force transmission mechanism (3), a mounting plate assembly (4), a pressure sensor (5), a pushing device (6) and a dial indicator (7); the frame (2) includes columns (21), a lifting plate (22) and a fixed seat (23), the columns (21) are vertically installed at the left and right ends of the fixed seat (23), and the lifting plate (22) is slidably installed on the two side columns (21); The mounting plate assembly (4) is fixedly installed at the upper end of the column (21), the force transmission mechanism (3) is vertically installed in the middle of the mounting plate assembly (4), the bottom end of the force transmission mechanism (3) is connected to the pressure sensor (5), the consolidation container (1) is arranged between the force transmission mechanism (3) and the lifting plate (22), the pushing device (6) is fixedly installed at the top of the fixed seat (23), and its upper end abuts against the lifting plate (22) for driving the lifting plate (22) to lift, the dial indicator (7) is detachably installed on the column (21), and its bottom abuts against the lifting plate (22) for measuring the displacement of the lifting plate (22); The pressure sensor (5), the pushing device (6) are electrically connected to an external control system.

2. The triaxial specimen preparation device for silt-sand mixed soil according to claim 1, characterized in that, The consolidation container (1) includes: A consolidation container base (12) for discharging gas and water in the soil sample; A sample preparation mold (11) arranged on the top of the consolidation container base (12) for loading the soil sample; A clamping assembly (13) installed on the consolidation container base (12) for clamping and fixing the sample preparation mold (11) on the consolidation container base (12); A first permeable stone (15) installed in the sample preparation mold (11) above the soil sample for discharging gas and water in the soil sample; A pressure rod (14) whose upper end abuts against the pressure sensor (5) and whose lower end abuts against the first permeable stone (15) for applying pressure to the soil sample in the sample preparation mold (11).

3. The triaxial specimen preparation device for silt-sand mixed soil according to claim 2, characterized in that, The consolidation container base (12) includes a drain valve (121), a second permeable stone (122), a consolidator base (123) and a gas and water guiding hole (124), a groove for installing the second permeable stone (122) is opened in the middle of the consolidator base (123), the second permeable stone (122) is installed in the groove, and gas and water guiding holes (124) are opened on the side wall of the groove, the drain valve (121) is communicated with the gas and water guiding hole (124) for discharging gas and water in the soil sample.

4. The triaxial specimen preparation device for silt-sand mixed soil according to claim 3, characterized in that, The clamping assembly (13) includes a fixed rod (131), a fixing plate (132), and a nut (133), the lower end of the fixed rod (131) is fixedly installed at both ends of the top of the consolidator base (123), the upper end of the fixed rod (131) is provided with an external thread, the fixing plate (132) is slidably installed on the two side fixed rods (131), a through hole is opened in the middle of the fixing plate (132), and the size of the through hole is larger than the inner diameter of the sample preparation mold (11), the nut (133) is threadedly connected to the upper end of the fixed rod (131) to apply pressure to the fixing plate (132) so that the sample preparation mold (11) is clamped and fixed between the fixing plate (132) and the consolidation container base (12).

5. The triaxial specimen preparation device for silt-sand mixed soil according to claim 1, characterized in that, A magnet is provided on the side wall of the dial indicator (7), the column (21) is made of steel, and the dial indicator (7) is mounted on the column (21) by magnetic attraction.

6. The triaxial specimen preparation device for silt-sand mixed soil according to claim 4, characterized in that, Clamping grooves for aligning the sample preparation mold (11) are provided at the bottom of the fixing plate (132) and the top of the consolidator base (123), and the two ends of the sample preparation mold (11) are clamped in the upper and lower clamping grooves. When the two ends of the sample preparation mold (11) are clamped in the upper and lower clamping grooves, the upper opening of the sample preparation mold (11) is aligned with the through hole in the middle of the fixing plate (132), and the second permeable stone (122) completely covers the lower opening of the sample preparation mold (11).

7. The triaxial specimen preparation device for silt-sand mixed soil according to claim 1, characterized in that, The mounting plate assembly (4) includes a top plate (41) and nuts (42). External threads are provided at the upper ends of the columns (21). The top plate (41) is slidably mounted on the two side columns (21). Two sets of nuts (42) are respectively threadedly connected to the upper ends of the columns (21), and the two sets of nuts (42) are respectively located at the upper and lower ends of the top plate (41) to clamp and fix the top plate (41).

8. The triaxial specimen preparation device for silt-sand mixed soil according to claim 7, characterized in that, The force transmission mechanism (3) includes an adjusting nut (31) and a threaded rod (32). A circular hole for avoiding the threaded rod (32) is provided in the middle of the top plate (41). The threaded rod (32) passes through the circular hole. Adjusting nuts (31) are respectively threadedly connected to both ends of the threaded rod (32), and the adjusting nuts (31) are clamped on both sides of the top plate (41) to limit and fix the threaded rod (32).

9. The triaxial specimen preparation device for silt-sand mixed soil according to claim 2, characterized in that, The pressure rod (14) includes a force transmission rod (141) and a loading head (142). Loading heads (142) are respectively connected to both ends of the force transmission rod (141), and the loading head (142) and the sample preparation mold (11) are in clearance fit.

10. The triaxial specimen preparation device for silt-sand mixed soil according to claim 2, characterized in that, The inner diameter of the sample preparation mold (11) is 39.1 mm and the height is 200 mm.

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