Anchorage assembly simulation flexible contact deformation mechanics simulation test device and method

Abstract

The anchor assembly simulation flexible contact deformation mechanics simulation test device and method, including a limiting frame and a simulation cylinder, the simulation cylinder is limited in the limiting frame, the anchor rod or anchor cable lock of the anchor assembly is located at one end of the simulation cylinder, and the simulation cylinder is filled with a material to be simulated environment; the anchor rod or anchor cable passes through the material to be simulated environment and is pulled out from the other end of the simulation cylinder for mechanics test. In the present application, the coal rock simulation material is pre-installed in the simulation cylinder, when the external force is loaded, the simulation cylinder and the coal rock model provide confining pressure, which can more truly simulate the stress condition of the steel strand in actual action, and the closed simulation cylinder ensures that the breaking does not occur, improves the safety, makes the anchor assembly flexible contact deformation, and makes the test result more accurate and targeted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prestressed steel strand reinforcement fastener test, in particular to an anchor assembly simulation flexible contact deformation mechanics simulation test device and method. BACKGROUND

[0002] The steel strand electro-hydraulic servo testing machine is a rigid testing machine for electro-hydraulic servo control of steel strand reinforcement fastener tension test, which is safe and reliable, has stable data, and can measure test force, stress, deformation, strain and other data. It has been widely used in anchor rod (cable) yield limit determination, tray deformation and damage stress analysis and damage effect test, and can provide laboratory basic data for underground space engineering and civil slope engineering supported by anchor rod (cable), monitor whether the steel strand reinforcement fastener is qualified, and has great economic, safe and social benefits. For some special conditions, when the actual application encounters soft rock and coal and other soft surrounding pressure environment, the steel strand electro-hydraulic servo testing machine cannot test it, the rigid contact causes the tray deformation to be fixed as a spherical convex, and the actual deformation cannot be truly reflected; the surrounding pressure environment causes the anchor rod (cable) yield limit to be only a reference value and cannot accurately reflect the limit breaking in this actual environment. SUMMARY

[0003] The technical problem to be solved by the present application is how to solve the safety and test accuracy of the anchor assembly in the mechanical test process.

[0004] The present application solves the above technical problems by the following technical means:

[0005] The anchor assembly simulation flexible contact deformation mechanics simulation test device comprises a limiting frame and a simulation cylinder; the simulation cylinder is limited in the limiting frame; the anchor assembly comprises an anchor rod or anchor cable, a tray and a lock; the simulation cylinder is filled with a material to be simulated; one end of the anchor rod or anchor cable passes through the material to be simulated and penetrates out of the simulation cylinder for mechanical test; the other end penetrates through the tray and is fixedly connected with the lock; and the tray abuts against the material to be simulated. In the present application, the coal rock simulation material is pre-installed in the simulation cylinder, when an external force is loaded, the simulation cylinder and the coal rock simulation material provide the confining pressure, so that the anchor rod (cable) is pulled throughout the triaxial confining pressure, in addition, the contact deformation between the lock tray and the coal rock material is different from the rigid contact, the measured data is more restored to the scene, and has great practical value. The closed simulation cylinder ensures that the breaking does not occur, improves the safety, makes the anchor assembly flexible contact deformation, and makes the test result more accurate and targeted.

[0006] Further, the limiting frame comprises a fixed plate, a limiting plate and fixing bolts; the fixed plate and the limiting plate are arranged in parallel and are detachably connected by at least three fixing bolts; and the fixed plate and the limiting plate are both provided with through holes for the anchor rod or the anchor cable to pass out.

[0007] Further, the simulation cylinder is a hollow frustum, and both ends of the simulation cylinder are open; and the lock is located at the large-diameter end of the simulation cylinder.

[0008] Further, the tray is smaller than the large-diameter end of the simulation cylinder in size, and the tray is pressed against the fixed plate by the environment simulation material.

[0009] Further, the tray is located at the large-diameter end of the simulation cylinder.

[0010] Further, the fixed plate and the limiting plate are both square plates, and the four corners of the square plates are detachably connected by four fixing bolts.

[0011] Further, the fixed plate is provided with a hole passing through the upper and lower portions in the central position, and the hole is smaller than the large-diameter size of the simulation cylinder and larger than the size of the tray.

[0012] Corresponding to the above device, the application also provides a simulation test method for the flexible contact deformation mechanics of an anchor assembly, comprising the following steps:

[0013] First, the anchor rod or the anchor cable to be simulated is passed through the simulation cylinder, then the simulation cylinder is placed with the small-diameter end downward, the coal rock simulation material is layered and compacted according to the actual simulation situation to form a hardened coal rock model; then the anchor rod or the anchor cable to be simulated is extracted, the fixed plate is placed in the center of the hydraulic loading test bed and fixed with the test bed, then the simulation cylinder together with the coal rock model is placed with the large-diameter end downward on the fixed plate, the limiting plate is placed above the simulation cylinder, the fixing bolts are passed through the bolt holes reserved in the limiting plate and the fixed plate, and the limiting nuts are locked and fixed; then the anchor rod or the anchor cable to be detected is passed through the upper through hole of the simulation cylinder from top to bottom, the tray is passed on the anchor rod or the anchor cable from the bottom and directly attached to the coal rock model at the bottom of the simulation cylinder, and then the lock is installed and fixed; finally, the steel strand electro-hydraulic servo testing machine is started to perform the mechanical test on the anchor assembly.

[0014] Further, during the test, the displacement of the anchor rod or the anchor cable and the deformation of the tray are recorded.

[0015] Further, after the test, the test device is disassembled in reverse, and the coal rock model is taken out from the large-diameter end of the simulation cylinder.

[0016] The application has the following advantages:

[0017] In the present application, by pre-setting the coal rock simulation material inside the simulation cylinder, when the external force is loaded, the simulation cylinder and the coal rock simulation material will provide confining pressure, so that the triaxial confining pressure is provided during the whole process of anchor rod (cable) pulling, in addition, the contact deformation area of the lock tray and the coal rock material is different from the rigid contact, the measurement data is more restored to the beneficial effect of the scene, and has great practical value. And the sealed simulation cylinder ensures that the breaking will not occur, improves the safety, makes the anchor assembly flexible contact deformation, and the test result is more accurate and has pertinence.

[0018] Especially by the hollow frustum simulation cylinder, the coal rock model can be separated from the large diameter end after the test is completed.

[0019] The fixed plate is a through hole penetrating through the upper and lower parts of the middle part, which is convenient for installing the tray and the lock, and the operation is more convenient. SCHEMATIC DRAWINGS

[0020] Figure 1 It is the overall structure schematic diagram of the mechanical test device in the embodiment of the present application.

[0021] Figure 2 It is the structure schematic diagram of the fixed plate and the limiting plate of the test device in the embodiment of the present application. PREFERRED EMBODIMENT

[0022] In order to make the purpose, technical scheme and advantages of the embodiment of the present application more clear, the technical scheme in the embodiment of the present application will be described clearly and completely in combination with the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all the embodiments. Based on the embodiment in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0023] Referring to the accompanying Figure 1 The anchor assembly simulation flexible contact deformation mechanical simulation test device comprises a limiting plate 1, a connecting long bolt 2, a simulation cylinder 3 and a fixed plate 4. The anchor assembly comprises an anchor rod or anchor cable 6, a tray 8 and an anchor rod or anchor cable lock 9. The coal rock module 7 is a simulated anchor site material, which can be laid and compacted in different layers according to the situation.

[0024] In the embodiment, the simulation cylinder 3 is a hollow frustum, and the two ends are open. The fixed plate 4 and the limiting plate 1 are arranged in parallel to clamp the simulation cylinder 3. The fixed plate 4 and the limiting plate 1 are detachably connected by at least 3 fixing bolts 2 to play a stabilizing role. In the embodiment, square plate materials are used, and one bolt is used for detachable fixing at each corner. The fixed plate 4 and the limiting plate 1 are both provided with through holes for the anchor rod or anchor cable 6 to pass out. The 4 bolts are symmetrically arranged, and the limiting plate 1 is uniformly stressed during the test.

[0025] As Figure 2As shown, the middle of the limiting plate has a through hole, the hole diameter is larger than the diameter of the anchor rod (cable), and the limiting holes are symmetrically distributed. The middle of the fixed plate is a regular hexagonal hole, the size of the simulation cylinder is larger than the hexagonal hole, which is convenient for clamping, can install the tray from the hexagonal hole, and pre-tighten the anchor rod with the lock. Four corners of the fixed plate are provided with fixing holes, and the relative positions of the fixing holes are the same as those of the limiting holes on the limiting plate.

[0026] The diameter of the lower end of the simulation cylinder is larger than the diagonal of the matching tray to ensure that the tray is in direct contact with the coal and rock model during loading. The size of the tray is smaller than the hexagonal hole on the fixed plate 4, which is convenient for installation; the tray 8 is provided with a hole for the anchor rod or anchor cable to pass through, the anchoring end of the anchor rod or anchor cable 6 passes through the tray and is anchored by the lock 9, and the other end passes through the limiting plate 1 for external tension. In this embodiment, the hole diameters of the middle of the fixed plate 4, the limiting plate 1, and the hollow hole on the upper end of the simulation cylinder are greater than 40 mm to adapt to anchor rods or anchor cables of different specifications.

[0027] In this embodiment, the anchor assembly simulation flexible contact deformation mechanical simulation test method is specifically as follows:

[0028] First, the anchor rod or anchor cable to be simulated is passed through the simulation cylinder, then the simulation cylinder is placed with the small diameter downward, the coal and rock simulation material is layered and compacted according to the actual simulation situation; then the anchor rod or anchor cable to be simulated is pulled out, the fixed plate is first placed in the center of the hydraulic loading test bed and fixed with the test bed, then the simulation cylinder is placed with the large diameter downward on the fixed plate, the limiting plate is placed above the simulation cylinder, the fixing bolts are passed through the bolt holes reserved in the limiting plate and the fixed plate, and the limiting nuts are locked and fixed; then the anchor rod or anchor cable to be detected is passed through the upper hole of the simulation cylinder from top to bottom, the tray is passed on the anchor rod or anchor cable from below the test bed (the middle of the test bed is designed as a hollow) and directly attached to the coal and rock model at the bottom of the simulation cylinder, and then the lock is installed and fixed; finally, the steel strand electro-hydraulic servo testing machine is started to test the anchor assembly.

[0029] During the test, the displacement of the anchor rod or anchor cable and the deformation of the tray are recorded.

[0030] After the test is completed, the test device is disassembled in reverse, and the coal and rock model is taken out from the large diameter end of the simulation cylinder.

[0031] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. Anchor assembly simulation flexible contact deformation mechanics simulation test device, characterized in that: The support frame includes a plurality of support members, a plurality of support members, and a plurality of support members. The support frame includes a plurality of support members, a plurality of support members, and a plurality of support members. The support frame includes a plurality of support members, a plurality of support members, and a plurality of support members. The support frame includes a plurality of support members, a plurality of support members, and a plurality of support members. The support frame includes a plurality of support members, a plurality of support members, and a plurality of support members.

2. The anchor assembly simulated flexible contact deformation mechanics simulation test device according to claim 1 is characterized in that: The tray is centrally located at the large diameter end of the simulation cylinder.

3. The anchor assembly simulated flexible contact deformation mechanics simulation test device according to claim 2, characterized in that: The fixing plate and the limiting plate are both square plates, and their four corners are detachably connected by four fixing bolts.

4. The anchor assembly simulated flexible contact deformation mechanics simulation test device according to claim 3, characterized in that: A hole is provided in the center of the fixing plate, which is through-hole in the vertical direction and has a size smaller than the major diameter of the simulation cylinder and larger than the size of the tray.

5. A mechanical simulation test method for simulating flexible contact deformation of an anchor assembly, applied to the test device according to any one of claims 1 to 4, characterized in that: The following steps are involved: First, pass the anchor rod or anchor cable to be simulated through the simulation tube, then place the simulation tube with the small diameter downward, lay the coal rock simulation material in layers according to the actual simulation situation and compact it to form a compacted coal rock model; then pull out the anchor rod or anchor cable to be simulated, first place the fixing plate in the center of the hydraulic loading test bench and fix it to the test bench, then place the simulation tube together with the coal rock model with the large diameter downward on the fixing plate, place a limit plate above the simulation tube, pass the fixing bolts through the bolt holes reserved in the limit plate and the fixing plate, and lock and fix them with limit nuts; then pass the anchor rod or anchor cable to be tested from top to bottom through the upper through hole of the simulation tube, pass the tray on the anchor rod or anchor cable from the bottom and directly stick it on the coal rock model at the bottom of the simulation tube, and then install the lock to fix it; finally, start the steel strand electro-hydraulic servo testing machine to perform mechanical tests on the anchor assembly.

6. The anchor assembly simulated flexible contact deformation mechanics simulation test method according to claim 5, characterized in that: During the test, the displacement of the anchor rod or anchor cable and the deformation of the tray are recorded.

7. The anchor assembly simulated flexible contact deformation mechanics simulation test method according to claim 5, characterized in that: After the test is completed, the test device is dismantled by reverse operation, and the coal and rock model is taken out from the large-diameter end of the simulation tube.

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