A device for detecting the shearing capacity of a volcanic ash soil

Abstract

The application provides a volcanic ash soil shearing capacity detection device, and relates to the technical field of soil shearing detection equipment.The device comprises a detection table, an upper shearing box, a lower shearing box, a positioning assembly, a horizontal pressure assembly, a vertical pressure assembly and a shearing detection assembly.The lower shearing box is slidingly connected to the detection table, and the upper shearing box is slidingly connected to the lower shearing box.A positioning assembly for limiting the position of the upper shearing box is installed in the lower shearing box.The horizontal pressure assembly is used to apply a horizontal thrust to one side of the lower shearing box.The vertical pressure assembly is used to apply a vertical pressure to the ash soil sample in the shearing groove.The shearing detection assembly is used to detect the shearing force of the ash soil sample.The positioning assembly can quickly unlock the fixation of the upper shearing box and the lower shearing box, and the unlocking operation is simple and convenient, so that the upper shearing box cannot move along the length direction of the detection table due to misoperation, the integrity of the ash soil sample in the two shearing grooves is maintained, and the accuracy of the detection of the shearing capacity of the ash soil sample is improved.

Description

Technical Field

[0001] This invention relates to the field of soil shear testing equipment, and in particular to a device for testing the shear resistance of volcanic ash soil. Background Technology

[0002] Lightweight lime-soil samples are characterized by high water content, high void ratio, high compressibility, and low strength. When used as foundations without treatment, they are prone to insufficient bearing capacity and excessive settlement. This study investigated the synergistic solidification of lightweight lime-soil samples using cement, nano-SiO2, and coconut shell fiber. First, the basic physical and mechanical properties of the lightweight lime-soil samples in this region were clarified. Then, unconfined compressive strength tests and triaxial shear tests were conducted to explore the mechanical properties of the solidified lightweight lime-soil samples, determine the optimal mix proportion, and discuss the solidification mechanism. Finally, indoor model tests were used to compare and analyze the effect of composite material mixing piles on reinforcing lightweight volcanic ash soft soil foundations.

[0003] The direct shear tester is a method used to perform shear tests on soil samples to determine the soil's shear strength. During use, the upper shear box must be fixed to the lower shear box using multiple bolts, ensuring alignment between the soil sample compartments within the upper and lower shear boxes. The soil sample is placed within both the upper and lower shear boxes. During the test, the assembled upper and lower shear boxes are installed on the testing platform. After adjusting all components, the bolts are rotated out to allow the upper shear box to move during shear capacity testing. However, unscrewing these bolts is not only cumbersome but also prone to causing premature lateral movement of the upper shear box under manual operation, reducing the accuracy of subsequent shear force testing components in assessing the soil's shear capacity. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a device for testing the shear strength of volcanic ash soil, thereby resolving the problems described above.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for testing the shear strength of volcanic ash soil includes a testing platform, an upper shear box, a lower shear box, a positioning component, a horizontal pressure component, a vertical pressure component, and a shear force detection component. The lower shear box is slidably connected to the testing platform, and the upper shear box is slidably connected to the lower shear box. The upper and lower shear boxes are respectively provided with aligned shear grooves. The positioning component for limiting the position of the upper shear box is installed inside the lower shear box. The horizontal pressure component, the vertical pressure component, and the shear force detection component are all installed on the testing platform. The horizontal pressure component is used to apply a horizontal thrust to one side of the lower shear box, the vertical pressure component is used to apply vertical pressure to the ash soil sample placed in the shear groove, and the shear force detection component is used to detect the shear force on the ash soil sample.

[0006] Preferably, the lower shear box has an installation chamber inside, the positioning component is installed in the installation chamber, and the adjustment end of the positioning component extends out of the lower shear box.

[0007] Preferably, the positioning assembly includes an adjusting gear ring, an adjusting member, and a plurality of positioning rods. The adjusting gear ring is rotatably disposed in the installation chamber. The adjusting member meshes with the adjusting gear ring. One end of the adjusting member extends into a lower shear box. The plurality of positioning rods are equidistantly disposed on the inner side of the adjusting gear ring along the circumference. The lower ends of the plurality of positioning rods are movably disposed on the lower shear box. The upper ends of the plurality of positioning rods correspond one-to-one with a plurality of positioning holes provided on the upper shear box to position the upper shear box. The adjusting gear ring slides with the plurality of positioning rods to adjust the lifting and lowering of the plurality of positioning rods.

[0008] Preferably, the adjusting toothed ring includes a toothed ring and an adjusting ring, the toothed ring meshing with an adjusting member, and the adjusting ring being connected to the inner wall of the toothed ring.

[0009] Preferably, the outer surface of each of the positioning rods is provided with a spiral groove, and the adjusting ring is slidably connected to the spiral groove of the positioning rods.

[0010] Preferably, the adjusting component includes an adjusting handle and a bevel gear. The adjusting handle is rotatably connected to the lower shear box, one end of the adjusting handle is connected to the bevel gear, and the bevel gear meshes with the adjusting gear ring.

[0011] Preferably, the upper end of the positioning rod is a threaded part, the positioning hole is a threaded hole, and the threaded part is threadedly connected to the threaded hole.

[0012] Preferably, the detection platform is provided with a plurality of first guide strips, and the bottom of the lower shear box is provided with a plurality of first guide grooves, the first guide grooves being slidably connected to the corresponding first guide strips.

[0013] Preferably, the upper part of the lower shear box is provided with a plurality of second guide grooves, and the bottom of the upper shear box is provided with a plurality of second guide strips, wherein the second guide grooves are slidably connected to the corresponding second guide strips.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The positioning component can fix the upper shear box onto the lower shear box, changing the traditional method of fixing the upper and lower shear boxes with multiple bolts. This aligns the two shear grooves of the upper and lower shear boxes, making it easier for the soil sample to be placed smoothly into the aligned shear grooves. The positioning component can also quickly unlock the upper and lower shear boxes, making the unlocking operation simple and convenient. It prevents the upper shear box from moving along the length of the testing platform due to accidental operation, maintaining the integrity of the soil sample in the two shear grooves and improving the accuracy of the shear resistance test of the soil sample. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a top view schematic diagram of the upper and lower shear boxes of the present invention; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of AA; Figure 4 for Figure 3 A magnified structural diagram of part A in the middle; Figure 5 This is a schematic cross-sectional view of the upper and lower shear boxes of the present invention. Figure 6 This is a three-dimensional structural diagram of the shear box of the present invention; Figure 7 This is a partial cross-sectional structural diagram of the shear box of the present invention; In the diagram, 1. Testing platform; 11. First guide bar; 2. Upper shear box; 21. Second guide bar; 3. Lower shear box; 31. First guide groove; 32. Second guide groove; 33. Installation chamber; 4. Positioning assembly; 41. Adjusting gear ring; 42. Gear ring; 43. Adjusting ring; 44. Adjusting component; 45. Adjusting handle; 46. Bevel gear; 47. Positioning rod; 48. Spiral groove; 49. Threaded part; 5. Positioning hole; 6. Horizontal pressurizing assembly; 7. Vertical pressurizing assembly; 8. Shear force detection assembly; 9. Shear force groove. Detailed Implementation

[0016] To better understand the technical content of this invention, specific embodiments are provided below, and the invention will be further described in conjunction with the accompanying drawings.

[0017] Example See Figures 1 to 7This invention provides a shear strength testing device for volcanic ash soil, comprising a testing platform 1, an upper shear box 2, a lower shear box 3, a positioning component 4, a horizontal pressure component 6, a vertical pressure component 7, and a shear force testing component 8. The lower shear box 3 is slidably connected to the testing platform 1 and can move along the length of the testing platform 1 under the push of the horizontal pressure component 6. The upper shear box 2 is slidably connected to the lower shear box 3. The upper and lower shear boxes 2 and 3 are respectively provided with aligned shear grooves 9. A positioning component 4 for limiting the position of the upper shear box 2 is installed inside the lower shear box 3. During assembly of the upper and lower shear boxes 2 and 3, the positioning component 4 can fix the upper shear box 2 onto the lower shear box 3, changing the traditional method of fixing the upper and lower shear boxes 2 and 3 with multiple bolts, thus aligning the corresponding shear grooves 9. The soil sample is stably placed into the two aligned shear grooves 9. After the equipment is debugged, the upper shear box 2 and the lower shear box 3 can be quickly unlocked by the positioning component 4. The unlocking operation is simple and convenient, and the upper shear box 2 will not move along the length of the test table 1 due to misoperation. This keeps the soil sample in the two shear grooves 9 intact and improves the accuracy of the shear resistance test of the soil sample. The horizontal pressure component 6, the vertical pressure component 7 and the shear force detection component 8 are all installed on the test table 1. The horizontal pressure component 6, the vertical pressure component 7 and the shear force detection component 8 are existing technologies and will not be described in detail here. The horizontal pressure component 6 is used to apply a horizontal thrust to one side of the lower shear box 3. The vertical pressure component 7 is used to apply a vertical pressure to the soil sample placed in the shear groove 9. The shear force detection component 8 is used to detect the shear force on the soil sample.

[0018] The lower shear box 3 has an installation chamber 33 inside, and the positioning component 4 is installed in the installation chamber 33. The adjustment end of the positioning component 4 extends out of the lower shear box 3.

[0019] The positioning assembly 4 includes an adjusting gear ring 41, an adjusting member 44, and several positioning rods 47. The adjusting gear ring 41 is rotatably disposed within the mounting chamber 33 and is concentric with the shear groove 9. The adjusting member 44 meshes with the adjusting gear ring 41, and the adjusting end of the adjusting member 44 extends out of the side of the lower shear box 3. One end of the adjusting member 44 extends out of the lower shear box 3. Several positioning rods 47 are equidistantly arranged circumferentially on the inner side of the adjusting gear ring 41. The lower ends of several positioning rods 47 are movably disposed on the lower shear box 3, and the upper ends of several positioning rods 47 are connected to several positioning holes 5 provided on the upper shear box 2. One-to-one correspondence is used to position the upper shear box 2, which is constrained to the lower shear box 3 from four directions. This ensures that the two shear grooves 9 set on the upper and lower shear boxes 2 and 3 are completely aligned, ensuring that the soil sample is stably placed in the shear groove 9. The adjusting toothed ring 41 is slidably engaged with several positioning rods 47 to adjust the lifting and lowering of the positioning rods 47. The operator rotates the adjusting component 44 to drive the adjusting toothed ring 41 to rotate, which drives the positioning rods 47 to rotate upward or downward. When the positioning rods 47 rotate upward, they are embedded in the positioning holes 5 of the upper shear box 2, which can position the upper shear box 2.

[0020] The adjusting gear ring 41 includes a gear ring 42 and an adjusting ring 43. The gear ring 42 meshes with the adjusting member 44 and is rotatably connected in the mounting chamber 33. The adjusting ring 43 is connected to the inner wall of the gear ring 42, which facilitates the adjustment ring 43 to cooperate with several positioning rods 47.

[0021] The outer surface of each of the positioning rods 47 is provided with a spiral groove 48, and the adjusting ring 43 is slidably connected to the spiral groove 48 of the positioning rods 47.

[0022] The adjusting ring 43 is slidably connected in the spiral groove 48. When the adjusting ring 43 rotates, it can simultaneously drive several positioning rods 47 to rotate upward or downward, which can simultaneously lock the upper shear box 2 and the lower shear box 3, or unlock the upper shear box 2 and the lower shear box 3.

[0023] The adjusting component 44 includes an adjusting handle 45 and a bevel gear 46. The adjusting handle 45 is rotatably connected to the lower shear box 3. One end of the adjusting handle 45 is connected to the bevel gear 46, and the bevel gear 46 meshes with the adjusting gear ring 41.

[0024] The upper end of the positioning rod 47 is a threaded part 49, and the positioning hole 5 is a threaded hole. The threaded part 49 is threadedly connected to the threaded hole. When the positioning rod 47 rotates upward, the threaded part 49 is threadedly connected to the threaded hole, so that the lower surface of the upper shear box 2 is effectively attached to the upper surface of the lower shear box 3.

[0025] The testing platform 1 is provided with a plurality of first guide bars 11, and the bottom of the lower shear box 3 is provided with a plurality of first guide grooves 31. The first guide grooves 31 are slidably connected to the corresponding first guide bars 11 to keep the lower shear box 3 sliding stably along the length direction of the testing platform 1.

[0026] The upper part of the lower shear box 3 is provided with several second guide grooves 32, and the bottom of the upper shear box 2 is provided with several second guide bars 21. The second guide grooves 32 are slidably connected to the corresponding second guide bars 21. After unlocking, the upper shear box 2 can slide on the lower shear box 3.

[0027] In use, the upper shear box 2 is placed above the lower shear box 3, the second guide bar 21 falls into the second guide groove 32, and the upper and lower shear grooves 9 are aligned. The adjusting component 44 is rotated, and the bevel gear 46 of the adjusting component 44 drives the adjusting gear ring 41 to rotate in the mounting chamber 33. The adjusting ring 43 of the adjusting gear ring 41 is simultaneously slidably connected with the spiral grooves 48 of several positioning rods 47. When the adjusting ring 43 rotates, the positioning rods 47 can be moved upward and embedded into the corresponding positioning holes 5 of the upper shear box 2 under the cooperation of the adjusting ring 43 and the spiral grooves 48. Several positioning rods 47 simultaneously lock the upper shear box 2. The assembly of the upper shear box 2 and the lower shear box 3 is simple and convenient. After the assembly of the upper shear box 2 and the lower shear box 3 is completed, Installed on the testing platform 1, the first guide bar 11 falls into the first guide groove 31. After the upper shear box 2 and the lower shear box 3 are installed on the testing platform 1, the adjusting handle 45 is rotated in the opposite direction. The adjusting handle 45 drives the gear and the adjusting ring 43 to rotate through the bevel gear 46. The rotating adjusting ring 43 acts on the spiral slide 48, driving several positioning rods 47 to rotate and descend. The several positioning rods 47 unlock the upper shear box 2 and the shear box at the same time. Unlocking is simple and convenient, and effectively avoids misoperation, keeping the soil sample intact. The vertical pressure component 7 applies vertical pressure to the soil sample installed in the shear groove 9. The horizontal pressure component 6 applies horizontal thrust to one side of the lower shear box 3. The shear force detection component 8 detects the shear force on the soil sample.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the shear strength of volcanic ash soil, characterized in that: The system includes a testing platform (1), an upper shear box (2), a lower shear box (3), a positioning component (4), a horizontal pressurizing component (6), a vertical pressurizing component (7), and a shear force detection component (8). The lower shear box (3) is slidably connected to the testing platform (1), and the upper shear box (2) is slidably connected to the lower shear box (3). The upper shear box (2) and the lower shear box (3) are respectively provided with relatively aligned shear grooves (9). The positioning component (4) for limiting the position of the upper shear box (2) is installed in the lower shear box (3). The horizontal pressurizing component (6), the vertical pressurizing component (7), and the shear force detection component (8) are all installed on the testing platform (1). The horizontal pressurizing component (6) is used to apply a horizontal thrust to one side of the lower shear box (3). The vertical pressurizing component (7) is used to apply a vertical pressure to the soil sample in the shear groove (9). The shear force detection component (8) is used to detect the shear force on the soil sample.

2. The device for testing the shear strength of volcanic ash soil as described in claim 1, characterized in that: The lower shear box (3) has an installation chamber (33) inside, and the positioning component (4) is installed in the installation chamber (33). The adjustment end of the positioning component (4) extends out of the lower shear box (3).

3. The device for testing the shear strength of volcanic ash soil as described in claim 2, characterized in that: The positioning assembly (4) includes an adjusting gear ring (41), an adjusting member (44), and several positioning rods (47). The adjusting gear ring (41) is rotatably disposed in the mounting chamber (33). The adjusting member (44) meshes with the adjusting gear ring (41). One end of the adjusting member (44) extends out into the lower shear box (3). Several positioning rods (47) are equidistantly disposed on the inner side of the adjusting gear ring (41) along the circumference. The lower ends of several positioning rods (47) are movably disposed on the lower shear box (3). The upper ends of several positioning rods (47) correspond one-to-one with several positioning holes (5) provided on the upper shear box (2) to position the upper shear box (2). The adjusting gear ring (41) and several positioning rods (47) slide together to adjust the lifting and lowering of several positioning rods (47).

4. The device for testing the shear strength of volcanic ash soil as described in claim 3, characterized in that: The adjusting toothed ring (41) includes a toothed ring (42) and an adjusting ring (43). The toothed ring (42) meshes with the adjusting member (44), and the adjusting ring (43) is connected to the inner wall of the toothed ring (42).

5. The device for testing the shear strength of volcanic ash soil as described in claim 4, characterized in that: The outer surface of each of the positioning rods (47) is provided with a spiral groove (48), and the adjusting ring (43) is slidably connected to the spiral groove (48) of the positioning rods (47).

6. The device for testing the shear strength of volcanic ash soil as described in claim 3, characterized in that: The adjusting component (44) includes an adjusting handle (45) and a bevel gear (46). The adjusting handle (45) is rotatably connected to the lower shear box (3). One end of the adjusting handle (45) is connected to the bevel gear (46), and the bevel gear (46) meshes with the adjusting gear ring (41).

7. The device for testing the shear strength of volcanic ash soil as described in claim 5, characterized in that: The upper end of the positioning rod (47) is a threaded part (49), the positioning hole (5) is a threaded hole, and the threaded part (49) is threadedly connected to the threaded hole.

8. The device for testing the shear strength of volcanic ash soil as described in claim 1, characterized in that: The detection platform (1) is provided with a plurality of first guide strips (11), and the bottom of the lower shear box (3) is provided with a plurality of first guide grooves (31), and the first guide grooves (31) are slidably connected to the corresponding first guide strips (11).

9. The device for testing the shear strength of volcanic ash soil as described in claim 1, characterized in that: The upper part of the lower shear box (3) is provided with several second guide grooves (32), and the bottom of the upper shear box (2) is provided with several second guide bars (21). The second guide grooves (32) are slidably connected to the corresponding second guide bars (21).

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