A kind of measuring field shearing test shearing slip surface three-dimensional coordinate measuring device

Abstract

The present application relates to the field of geotechnical mechanics test, concretely to a three-dimensional coordinate measuring device for measuring the shear sliding surface of a push-shear test on site. The device comprises a rack, a pulley device, an X-direction coordinate rod, a coordinate slider and a Z-direction coordinate scale. The top of the rack is provided with horizontally distributed Y-direction coordinate rods, and the Y-direction coordinate rods are provided with scale lines along the length direction. The pulley device is slidingly clamped on the rack. The X-direction coordinate rod is horizontally arranged on the pulley device and perpendicular to the Y-direction coordinate rod, and the top surface is pasted with a pastable ruler along the horizontal direction. The coordinate slider is slidingly arranged on the X-direction coordinate rod and is provided with a threaded hole facing the X-direction coordinate rod. The Z-direction coordinate scale is slidingly clamped on the coordinate slider along the vertical direction. The present application can determine the sliding surface without damaging the soil structure and changing the soil strength.

Description

Technical Field

[0001] This invention relates to the field of geotechnical mechanics testing, and in particular to a device for measuring the three-dimensional coordinates of the shear sliding surface in a field push-shear test. Background Technology

[0002] The main methods for determining the shear strength of soil are indoor tests and outdoor tests. Indoor tests include direct shear tests and triaxial shear tests, while outdoor tests are field horizontal shear tests, which are also the main way to determine the shear strength of soil.

[0003] After the on-site horizontal shear test, it is necessary to determine the 3D sliding surface. People determine the 3D sliding surface by drilling lime holes. However, coarse soil particles are too large to drill lime holes. Moreover, drilling lime holes will not only damage the soil structure, but also change the soil strength. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a three-dimensional coordinate measuring device for measuring the shear sliding surface in a field push-shear test, which determines the sliding surface without damaging the soil structure or changing the soil strength.

[0005] The technical solution of this invention is a three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test, comprising a frame, a pulley device, an X-axis coordinate rod, a coordinate slider, and a Z-axis coordinate scale. The top of the frame has horizontally distributed Y-axis coordinate rods with scale lines along their length. The pulley device is slidably mounted on the frame. The X-axis coordinate rods are horizontally mounted on the pulley device and perpendicular to the Y-axis coordinate rods, with a horizontally attachable ruler attached to their top surface. The coordinate slider is slidably mounted on the X-axis coordinate rods and has a threaded hole facing the X-axis coordinate rods. The Z-axis coordinate scale is slidably mounted on the coordinate slider in the vertical direction.

[0006] Preferably, two Y-axis coordinate rods are symmetrically arranged on the top of the frame.

[0007] Preferably, the frame is an aluminum profile structure.

[0008] Preferably, the frame has a slide groove, and the pulley device includes two sets of pulley assemblies symmetrically distributed. The pulley assembly includes four pulleys that are slidably engaged in the slide groove and a mounting plate for mounting the pulleys. Screws are threaded through the mounting plate and the pulleys, and nuts are threaded onto the top of the screws.

[0009] Preferably, the X-axis coordinate rod has elongated holes distributed along its length, and the mounting plate has threaded connection holes, with bolts threaded through the elongated holes.

[0010] Preferably, the coordinate slider has vertically distributed slots for sliding the Z-axis coordinate scale.

[0011] Preferably, the bottom of the frame is provided with four foot screws, and the bottom of the foot screws is provided with sheet metal.

[0012] Preferably, the method of using the above-mentioned three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test includes the following steps:

[0013] S1. Before conducting the on-site horizontal shear test on the sample, install this device outside the test pit and level it using a leveling rod.

[0014] S2. With point M as the origin, measure the height of the sliding surface of the sample in the X and Y directions. The coordinate slider slides on the X coordinate rod and is fixed by tightening the screw at the bolt hole. The height of the sliding surface is measured by sliding the Z coordinate scale in the Z direction. After the measurement is completed, slide the pulley device along the Y coordinate rod. Repeat the above operation until the height of the sliding surface at different positions is measured. Record the height of each coordinate in the X and Y directions and remove the device.

[0015] S3. After the on-site horizontal shear test, move the device to the same position and level it. Repeat step S2, measure and record the height of each coordinate in the X and Y directions, and subtract the data before the on-site horizontal shear test from the data measured after the on-site horizontal shear test to obtain the height of each coordinate of the sliding surface.

[0016] S4. Draw the sliding surface.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] This invention determines the sliding surface without damaging the soil structure or changing the soil strength, resulting in more reliable test results, lower cost, guaranteed measurement accuracy, and ease of field use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure of the pulley assembly;

[0021] Figure 3 This is a schematic diagram of the coordinate slider.

[0022] Reference numerals: 1. Frame; 2. Y-axis coordinate rod; 3. X-axis coordinate rod; 4. Adhesive ruler; 5. Pulley assembly; 51. Mounting plate; 52. Pulley; 6. Bolt; 7. Coordinate slider; 71. Slot; 8. Z-axis coordinate scale; 9. Foot screw; 10. Sheet metal. Detailed Implementation

[0023] like Figures 1-3As shown in the figure, the three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test proposed in this embodiment includes a frame 1, a pulley device, an X-axis coordinate rod 3, a coordinate slider 7, and a Z-axis coordinate scale 8.

[0024] The frame 1 is an aluminum profile structure with sliding grooves on the sides. The top of the frame 1 has horizontally distributed Y-axis coordinate rods 2, which are used to determine the Y-axis coordinates. Two Y-axis coordinate rods 2 are symmetrically arranged on the top of the frame 1, and scale lines are set on the Y-axis coordinate rods 2 along the length direction.

[0025] The pulley system is slidably mounted on the frame 1. The pulley system includes two symmetrically distributed sets of pulley assemblies 5. Each pulley assembly 5 includes four pulleys 52 slidably mounted in a groove, and a mounting plate 51 for mounting the pulleys 52. The pulleys 52 can only slide along the length of the groove, i.e., along the Y-axis. Screws are threaded onto the mounting plate 51 and the pulleys 52, with nuts threaded onto the top of the screws. When it is necessary to fix the pulleys 52, the nuts and screws are tightened so that the pulleys 52 are pressed tightly against the frame 1.

[0026] The X-axis coordinate rod 3 is horizontally mounted on the pulley device and perpendicular to the Y-axis coordinate rod 2. The position of the X-axis coordinate rod 3 is adjusted by sliding the pulley device, thereby determining the Y-axis coordinate of the measuring sliding surface based on the position of the X-axis coordinate rod 3 pointing to the scale line on the Y-axis coordinate rod 2. A horizontally attached ruler 4 is pasted onto the top surface of the X-axis coordinate rod 3 for measuring the X-axis coordinate. The X-axis coordinate rod 3 has elongated holes distributed along its length. The mounting plate 51 has threaded connection holes, through which bolts 6 are threaded, connecting the mounting plate 51 and the X-axis coordinate rod 3. When adjusting the position of the X-axis coordinate rod 3, the pulley 52 can slide in the groove. When it is necessary to fix the X-axis coordinate rod 3, the screw and nut are tightened to lock the pulley 52 into the inner wall of the groove in the frame 1.

[0027] The coordinate slider 7 is slidably mounted on the X-axis coordinate rod 3. The coordinate slider 7 has a threaded hole facing the X-axis coordinate rod 3 and vertically distributed slots 71 for sliding the Z-axis coordinate scale 8. After adjusting the coordinate slider 7 to its X-axis position, screws are screwed into the threaded hole, with the end of the screw pressing against the X-axis coordinate rod 3 to fix the coordinate slider 7. The X-axis coordinate is determined by observing the scale lines on the adhesive ruler 4 aligned with the side of the coordinate slider 7.

[0028] The Z-axis coordinate scale 8 is slidably mounted on the slot 71 of the coordinate slider 7 in the vertical direction. The Z-axis coordinate scale 8 is used to measure the Z-axis coordinate. By sliding the Z-axis coordinate scale 8 in the vertical direction and observing the position indicated by the coordinate slider 7 on the Z-axis coordinate scale 8, the measured Z-axis coordinate, i.e., the height of the sliding surface, is determined.

[0029] The bottom of the frame 1 is equipped with four foot screws 9 to facilitate the adjustment of the flatness of the entire device. The bottom of the foot screws 9 is equipped with sheet metal 10 to facilitate the positioning of the device before and after the on-site horizontal push-shear test.

[0030] The method of using the above-mentioned three-dimensional coordinate measuring device for the shear sliding surface in a push-shear test includes the following steps:

[0031] S1. Before conducting the on-site horizontal shear test on the sample, install this device outside the test pit, place the leveling rod on the Y-axis coordinate rod 2 and the X-axis coordinate rod 3 respectively, and level the device using the leveling rod.

[0032] S2. With point M as the origin, measure the height of the sliding surface of the sample in the X and Y directions. The coordinate slider 7 slides on the X-axis coordinate rod 3 and is fixed by tightening the screws at the bolt holes. The height of the sliding surface is measured by sliding the Z-axis coordinate scale 8 in the Z direction. After the measurement is completed, the fastening of the coordinate slider 7 and the pulley device is released. The pulley device is slid along the Y-axis coordinate rod 2. The above operation is repeated until the height of the sliding surface at different positions is measured. The height of each coordinate in the X and Y directions is recorded. The device is removed, but the sheet metal 10 is not removed. Other structures are removed.

[0033] S3. After the on-site horizontal shear test, move the device to the same position and level it. That is, put the device back on the sheet metal 10. The sheet metal 10 plays a positioning role. Repeat step S2, measure and record the height of each coordinate in the X and Y directions. Subtract the data before the on-site horizontal shear test from the data measured after the on-site horizontal shear test to obtain the height of each coordinate of the sliding surface.

[0034] S4. Draw the sliding surface based on the height data of each coordinate of the obtained sliding surface.

[0035] This embodiment determines the sliding surface without damaging the soil structure or changing the soil strength, resulting in more reliable test results. It has a simple structure, is easy to operate, and can ensure the accuracy of the measurement. Compared with the traditional laser scanning method for the sliding surface, this device does not require electricity, has low measurement costs, and is convenient for field use.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A device for measuring the three-dimensional coordinates of the shear sliding surface in a field push-shear test, characterized in that, include: The frame (1) has horizontally distributed Y-axis coordinate rods (2) on its top, and scale lines are set on the Y-axis coordinate rods (2) along the length direction; A pulley device, which is slidably mounted on the frame (1); The X-axis coordinate rod (3) is horizontally set on the pulley device and perpendicular to the Y-axis coordinate rod (2). A ruler (4) is pasted on the top surface in the horizontal direction. The coordinate slider (7) is slidably disposed on the X-axis coordinate rod (3) and has a threaded hole facing the X-axis coordinate rod (3); The Z-axis coordinate scale (8) is mounted on the coordinate slider (7) in the vertical direction.

2. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 1, characterized in that, Two Y-axis coordinate rods (2) are symmetrically set on the top of the frame (1).

3. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 1, characterized in that, The frame (1) is an aluminum profile structure.

4. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 3, characterized in that, The frame (1) has a slide groove, and the pulley device includes two sets of pulley assemblies (5) symmetrically distributed. The pulley assembly (5) includes four pulleys (52) that are slidably locked in the slide groove and a mounting plate (51) for mounting the pulleys (52). Screws are threaded through the mounting plate (51) and the pulleys (52), and nuts are threaded onto the top of the screws.

5. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 4, characterized in that, The X-axis coordinate rod (3) has elongated holes distributed along the length direction, and the mounting plate (51) has threaded connection holes, with bolts (6) threaded through the elongated holes.

6. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 1, characterized in that, The coordinate slider (7) has a slot (71) that is vertically distributed and allows the Z-axis coordinate scale (8) to slide.

7. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 1, characterized in that, The bottom of the frame (1) is provided with four foot screws (9), and the bottom of the foot screws (9) is provided with sheet metal (10).

8. The three-dimensional coordinate measuring device for measuring the shear sliding surface in a push-shear test according to claim 1, characterized in that, The usage method includes the following steps: S1. Before conducting the on-site horizontal shear test on the sample, install this device outside the test pit and level it using a leveling rod. S2. With point M as the origin, measure the height of the sliding surface of the sample in the X and Y directions. The coordinate slider (7) slides on the X coordinate rod (3) and is fixed by tightening the screw at the bolt hole. The height of the sliding surface is measured by sliding the Z coordinate scale (8) in the Z direction. After the measurement is completed, slide the pulley device along the Y coordinate rod (2) and repeat the above operation until the height of the sliding surface at different positions is measured. Record the height of each coordinate in the X and Y directions and remove the device. S3. After the on-site horizontal shear test, move the device to the same position and level it. Repeat step S2, measure and record the height of each coordinate in the X and Y directions, and subtract the data before the on-site horizontal shear test from the data measured after the on-site horizontal shear test to obtain the height of each coordinate of the sliding surface. S4. Draw the sliding surface.

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