A cross plate shearing test device integrated with pore water pressure measurement

Abstract

The utility model discloses a cross board shearing test device of integrated hole pressure measurement relates to soil body exploration field, including support frame, the lateral surface of setting in support frame, surveying staff, set up the bottom of cross board head that surveying staff's bottom is provided with in the cross board head, measure the pore water pressure of soil body in the cross board head shearing test process on the cross board head, drive mechanism, set up on the cross board, be used for driving surveying staff rotation movement to can drive surveying staff vertical penetration or lift along its axial direction, and pore water pressure monitoring is combined with traditional cross board shearing test, can in one penetration process synchronous acquisition soil's shearing strength and pore water pressure response, has effectively improved the comprehensive nature and test efficiency of test data.

Description

Technical Field

[0001] This utility model relates to soil exploration technology, specifically to a vane shear test device that integrates pore pressure measurement. Background Technology

[0002] The vane shear test is a widely used in-situ testing method for determining the undrained shear strength of soft soil foundations such as soft clay and silt. Its basic principle involves inserting a vane of a specific shape into the soil to a predetermined depth, then twisting it at a constant rate. The maximum resisting moment generated when the soil fails under shear is measured, and the undrained shear strength of the soil can then be calculated. This test equipment is simple, easy to operate, and provides intuitive and reliable results, playing an important role in geotechnical engineering investigation and foundation evaluation.

[0003] However, the traditional vane shear test can only obtain the shear strength parameters of the soil, and it is difficult to reflect the generation and dissipation of pore water pressure in the soil during the shearing process.

[0004] Based on this, the present invention provides a vane shear test device that integrates pore pressure measurement. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a vane shear test device that integrates pore pressure measurement. By combining pore water pressure monitoring with the traditional vane shear test, it can simultaneously acquire the soil shear strength and pore water pressure response during a single penetration, effectively improving the comprehensiveness and efficiency of the test data. The pore pressure is directly measured by a pore water pressure sensor built into the vane head, avoiding the errors caused by traditional indirect calculation methods. It is particularly suitable for strata such as saturated soft clay and silt that are sensitive to changes in pore pressure.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a vane shear test device integrating pore pressure measurement, comprising a support frame; a horizontal plate disposed on the side of the support frame; a measuring rod disposed at the bottom of the horizontal plate, wherein a vane head is disposed at the bottom of the measuring rod; a measuring element disposed at the vane head for measuring the pore water pressure of the soil during the vane head shear test; and a driving mechanism disposed on the horizontal plate for driving the measuring rod to rotate and for driving the measuring rod to penetrate vertically or lift along its axial direction.

[0007] Furthermore, the driving mechanism includes a rotating sleeve rotatably mounted on the horizontal plate; a rotating bar slidably inserted into the rotating sleeve, and the measuring rod connected to the bottom end of the rotating bar; and a driving component one mounted on the horizontal plate for driving the rotating sleeve to rotate.

[0008] Furthermore, the driving mechanism also includes a gear shaft, which is mounted on the horizontal plate via a bracket; a rack, which is rotatably mounted on the top of the rotating bar and meshes with the gear shaft; and a second driving member, which is mounted on the side of the bracket and is used to drive the gear shaft to rotate.

[0009] Furthermore, a limiting sleeve is provided on the side of the support frame, and the limiting sleeve is slidably connected to the toothed rod.

[0010] Furthermore, the measuring element includes a torque sensor disposed between the rotating bar and the measuring rod, for measuring the torque of the crosshead.

[0011] Furthermore, the measuring device also includes a pore water pressure sensor, which is disposed on the crosshead and used to measure the change in pore water pressure in the soil when the crosshead rotates within the soil.

[0012] Compared with existing technologies, this utility model provides a vane shear test device integrating pore pressure measurement. By aligning the measuring rod with a pre-set test hole, a drive mechanism presses the vane head into the soil to a specified depth. Subsequently, a rotation drive is activated, causing the vane head to twist within the soil, simulating a shearing process. During this process, the pore pressure measuring element integrated into the vane head collects pore water pressure data in real time and transmits it to a data output terminal instrument for display and recording. This structural design combines pore water pressure monitoring with traditional vane shear testing, enabling simultaneous acquisition of soil shear strength and pore water pressure response during a single penetration, effectively improving the comprehensiveness and efficiency of the test data.

[0013] By directly measuring pore pressure using a pore water pressure sensor built into the vane head, errors caused by traditional indirect calculation methods are avoided. This method is especially suitable for strata such as saturated soft clay and silt that are sensitive to changes in pore pressure. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the vane shear test device integrating pore pressure measurement in this embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the back structure of the vane shear test device integrating pore pressure measurement in this embodiment of the present invention;

[0017] Figure 3This is a front structural schematic diagram of the vane shear test device integrating pore pressure measurement in an embodiment of this utility model;

[0018] Figure 4 yes Figure 2 Enlarged structural diagram at point A;

[0019] Figure 5 This is a schematic diagram of the structure of the measuring rod and the crosshead in an embodiment of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the measuring rod and the other side of the crosshead in an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Support frame; 2. Horizontal plate; 3. Measuring rod; 300. Connecting rod one; 301. Connecting rod two; 302. Insert sleeve; 303. Screw sleeve; 4. Cross head; 5. Measuring component; 500. Torque sensor; 501. Pore water pressure sensor; 6. Drive mechanism; 600. Rotating sleeve; 601. Rotating bar; 602. Drive component one; 603. Gear shaft; 604. Gear rack; 605. Drive component two; 7. Limiting sleeve; 8. Data output terminal instrument. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] As attached Figure 1 To be continued Figure 6 As shown:

[0025] Example 1:

[0026] This utility model provides a vane shear test device for integrated pore pressure measurement, including a support frame 1, a horizontal plate 2, a measuring rod 3, a measuring component 5, a driving mechanism 6, and a data output terminal instrument 8;

[0027] The horizontal plate 2 is set on the side of the support frame 1; the measuring rod 3 is set at the bottom of the horizontal plate 2, and the bottom of the measuring rod 3 is provided with a crosshead 4; the measuring element 5 is set on the crosshead 4 and is used to measure the pore water pressure of the soil during the shear test of the crosshead 4; the driving mechanism 6 is set on the horizontal plate 2 and is used to drive the measuring rod 3 to rotate and can drive the measuring rod 3 to penetrate vertically or lift along its axis.

[0028] Specifically, the measuring rod 3 is first aligned with the preset measuring hole, and the crosshead 4 is pressed into the soil to the specified depth by the drive mechanism 6; then the rotation drive is started, causing the crosshead 4 to twist in the soil, simulating a shearing process. During this process, the pore pressure measuring element 5 integrated on the crosshead 4 collects pore water pressure data in real time and transmits it to the data output terminal instrument 8 for display and recording.

[0029] This structural design combines pore water pressure monitoring with traditional vane shear testing, enabling the simultaneous acquisition of soil shear strength and pore water pressure response during a single penetration, effectively improving the comprehensiveness of test data and test efficiency.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the driving mechanism 6 includes a rotating sleeve 600, a rotating bar 601, and a driving component 602; the rotating sleeve 600 is rotatably mounted on the horizontal plate 2; the rotating bar 601 is slidably inserted into the rotating sleeve 600, and the measuring rod 3 is connected to the bottom end of the rotating bar 601; the driving component 602 is mounted on the horizontal plate 2 and is used to drive the rotating sleeve 600 to rotate.

[0031] like Figure 2 and Figure 4 As shown, the drive mechanism 6 also includes a gear shaft 603, a rack 604, and a second drive component 605; the gear shaft 603 is mounted on the horizontal plate 2 via a bracket; the rack 604 is rotatably mounted on the top of the rotating bar 601, and the rack 604 meshes with the gear shaft 603; the second drive component 605 is mounted on the side of the bracket and is used to drive the gear shaft 603 to rotate.

[0032] Specifically, both drive component 1 602 and drive component 2 605 are servo motors and are controlled by a PLC, enabling them to rotate in both directions. Drive component 1 602 is connected to the rotating sleeve 600 via a transmission belt (or toothed belt), and the output end of drive component 2 605 is connected to the side end of the gear shaft 603.

[0033] Specifically, the second driving component 605 drives the gear shaft 603 to rotate, thereby driving the gear rod 604 to move up and down, which in turn pushes the rotating bar 601 to move up and down within the rotating sleeve 600, inserting (or lifting) the crosshead 4 into the soil. Then, the first driving component 602 drives the rotating sleeve 600 to rotate, thereby causing the rotating bar 601 to drive the measuring rod 3 to rotate, completing the rotation of the crosshead 4 within the soil.

[0034] This structural design enables electric control of penetration and rotation, reducing human error and improving the consistency and repeatability of the test. It also allows for shear tests at different rates, meeting the simulation needs of various working conditions.

[0035] like Figure 1As shown, a limiting sleeve 7 is also provided on the side of the support frame 1, and the limiting sleeve 7 is slidably connected to the toothed rod 604.

[0036] like Figure 1 and Figure 3 As shown, the measuring component 5 includes a torque sensor 500 and a pore water pressure sensor 501; the torque sensor 500 is disposed between the rotating bar 601 and the measuring rod 3 and is used to measure the torque of the crosshead 4; the pore water pressure sensor 501 is disposed on the crosshead 4 and is used to measure the change in pore water pressure of the soil when the crosshead 4 rotates in the soil.

[0037] Specifically, the pore pressure is directly measured by the pore water pressure sensor 501 built into the crosshead 4, avoiding the errors caused by the traditional indirect calculation method. It is especially suitable for strata such as saturated soft clay and silt that are sensitive to changes in pore pressure.

[0038] Example 2:

[0039] This embodiment is a further optimization based on the first embodiment described above. The parts that are the same as those in the aforementioned technical solution will not be repeated here. Figure 5 and Figure 6 As shown, to better realize this utility model, the following arrangement is specifically adopted. In this embodiment, the measuring rod 3 includes a first connecting rod 300 and a second connecting rod 301. The cross plate head 4 is threadedly connected to the bottom end of the first connecting rod 300 through a screw, completing the detachable assembly. The second connecting rod 301 is inserted into the side end of the first connecting rod 300 through a plug sleeve 302, and the second connecting rod 301 and the first connecting rod 300 are connected by a screw sleeve 303. The top end of the second connecting rod 301 is detachably connected to the torque sensor 500 (it can be a threaded connection or a plug connection, etc.).

[0040] Specifically, multiple connecting rods 1 300 and connecting rod 2 301 can be connected according to the depth to which the crosshead 4 is to be inserted.

[0041] Specifically, multiple connecting rod 1 (300) and connecting rod 2 (301) units can be flexibly connected in series according to the required penetration depth of the test, allowing for free extension of the total length of the measuring rod 3. Meanwhile, the crosshead 4 also features a detachable design, facilitating the replacement of shear heads of different specifications according to soil conditions.

[0042] Through this structural design, the modular rod assembly allows for flexible adjustment of the total length of the measuring rod 3 to meet the testing needs at different depths, significantly expanding the testing range of the device. It is especially suitable for exploration scenarios in deep soil or special sites. The detachable rod structure overcomes the problem of difficult handling of integrated long rods, reducing the difficulty of transportation and on-site operation, and is conducive to deployment and use in engineering sites with limited space or in remote areas.

[0043] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An integrated pore water pressure measurement vane shear test apparatus, characterized by, include: Support frame (1); A horizontal plate (2) is provided on the side of the support frame (1); The measuring rod (3) is set at the bottom of the horizontal plate (2), and the bottom of the measuring rod (3) is provided with a cross plate head (4); Measuring piece (5) is set on the vane head (4) and is used to measure the pore water pressure of the soil during the shear test of the vane head (4); The driving mechanism (6) is set on the horizontal plate (2) and is used to drive the measuring rod (3) to rotate and drive the measuring rod (3) to penetrate vertically or lift along its axis.

2. The integrated pore water pressure measurement vane shear test apparatus according to claim 1, wherein The drive mechanism (6) includes: Rotary sleeve (600) is rotatably mounted on the horizontal plate (2); The rotating bar (601) is slidably inserted into the rotating sleeve (600), and the measuring rod (3) is connected to the bottom end of the rotating bar (601); A drive component (602) is mounted on the horizontal plate (2) and is used to drive the rotating sleeve (600) to rotate.

3. The vane shear test device for integrated pore pressure measurement according to claim 2, characterized in that, The drive mechanism (6) also includes: The gear shaft (603) is mounted on the horizontal plate (2) via a bracket; A rack (604) is rotatably disposed at the top end of the rotating bar (601), and the rack (604) meshes with the gear shaft (603); The second driving component (605) is disposed on the side of the bracket and is used to drive the gear shaft (603) to rotate.

4. The integrated pore water pressure measurement vane shear test apparatus according to claim 3, wherein The support frame (1) is also provided with a limiting sleeve (7) on its side, and the limiting sleeve (7) is slidably connected to the toothed rod (604).

5. The integrated pore water pressure measurement vane shear test apparatus according to claim 2, wherein The measuring element (5) includes: A torque sensor (500) is disposed between the rotating bar (601) and the measuring rod (3) for measuring the torque of the crosshead (4).

6. The integrated pore water pressure measurement vane shear test apparatus according to claim 5, wherein The measuring element (5) also includes: A pore water pressure sensor (501) is installed on the crosshead (4) to measure the change in pore water pressure in the soil when the crosshead (4) rotates within the soil.

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