Device and method for testing working performance of anchor rod cable by simulating rock stratum fracture and separation on basis of electromagnetic action

Patent metadata

Field	Value
Publication number	US-11199484-B2
Application number	US-201816487425-A
Country	US
Kind code	B2
Filing date	Sep 13, 2018
Priority date	Dec 18, 2017
Publication date	Dec 14, 2021
Grant date	Dec 14, 2021

Abstract

A device and method for testing the working performance of an anchor rod cable by simulating stratum fracture and separation on the basis of electromagnetic action, applicable to the technical field of testing working performance of anchor rod cables by simulating a tunnel field. The device comprises a top base ( 1 ) and a bottom base ( 2 ); a plurality of hydraulic vertical columns ( 3 ) are provided between the top base ( 1 ) and the bottom base ( 2 ); the plurality of hydraulic vertical columns ( 3 ) are provided thereon with clamping devices, and an electromagnetic block ( 9 ) is disposed between two groups of drawing block-shaped clamp holders ( 4 ). Using the attraction and repulsion forces of the electromagnetic block ( 9 ), the laminated electromagnetic block generates the separating or fracturing effect in a loading process so as to simulate the interaction between surrounding rock and an anchor rod cable test piece ( 8 ) in the field and accurately record various performance parameters of a working status of the anchor rod cable test piece ( 8 ), thereby providing positive guidance for directing field work.

First claim

The invention claimed is:

1. An anchor rod or cable operating performance testing device designed to simulate fracturation and bed separation based on electromagnetic action, comprising a top seat and a base, with a plurality of hydraulic columns being arranged between the top seat and the base, and a clamping device being arranged on a plurality of hydraulic columns, characterized in that:
the clamping device comprises two sets of drawing block clamping bodies, wherein two sets of drawing block clamping bodies are respectively arranged on the hydraulic rods or the hydraulic cylinders of a plurality of hydraulic columns, and two sets of drawing block clamping bodies are arranged at upper and lower positions oppositely, the drawing block clamping bodies comprises multiple sets of clamping bodies, and the multiple sets of clamping bodies are used for clamping or loosening the anchor rod or cable under test, each set of clamping bodies comprises a front block clamping body and a rear block clamping body, the front block clamping body is provided with a block clamping body hydraulic cylinder which is connected with the rear block clamping body, the front block clamping body is slidably connected with the rear block clamping body, and a block clamping body sensor is arranged on the contact surface between the front block clamping body of each set of clamping bodies and the front block clamping body of other set of clamping bodies;
between two sets of drawing block clamping bodies, a bedded rock mass simulating device is configured at a position close to the underneath of the drawing block clamping body arranged at the hydraulic rod, the bedded rock mass simulating device comprises an electromagnet part, both sides of the electromagnet part are respectively provided with hydraulic pushing baffles, and each of the hydraulic pushing baffles is supported on the lateral hydraulic column by the baffle arranged at the bottom of an electromagnetic jack, the electromagnetic jack comprises an electromagnet hydraulic cylinder and a hydraulic supporting part, the electromagnet part comprises two sets of correspondingly arranged electromagnets, which include a terminal electromagnet and a front-end electromagnet, wherein the terminal electromagnet is fixed on a hydraulic column, and the front-end electromagnet is movably connected with the terminal electromagnet for facilitating free disassembly, an arc-shaped groove is arranged at the position where the inner angles of the front-end electromagnet and the terminal electromagnet contact with the anchor rod or cable test piece, a rubber elastic gasket is arranged in the arc-shaped groove, and a safety door is arranged between two front-end electromagnets, only when the safety door is opened, the electromagnet part can be taken out, the front-end electromagnet is composed of a plurality of rectangular electromagnetic blocks arranged side by side, the safety door is arranged on the outside of the plurality of electromagnetic blocks, the electromagnetic blocks are provided with a plurality of internal electromagnetic coils, the safety door is provided with an electromagnet door handle and a safety door valve, the safety door is a protective measure arranged at the front-end of the electromagnet part.

2. The anchor rod or cable operating performance testing device designed to simulate fracturation and bed separation based on electromagnetic action according to claim 1 , characterized in that, there are 4 to 6 rectangular electromagnetic blocks, the height of each electromagnetic block is 3 to 10 cm, and the total height of the rectangular electromagnetic blocks is 12 to 60 cm; the electromagnet blocks form an integral whole by using the magnetic force interaction.

3. The anchor rod or cable operating performance testing device designed to simulate fracturation and bed separation based on electromagnetic action according to claim 1 , characterized in that, the plurality of internal electromagnetic coils are wound around a cylindrical iron block and are integrally embedded in the electromagnetic blocks to form a whole.

4. The anchor rod or cable operating performance testing device designed to simulate fracturation and bed separation based on electromagnetic action according to claim 1 , characterized in that, the rubber elastic gasket has a thickness of 2 to 5 cm and is bonded on the inner wall of the quarter circle arc-shaped groove of the electromagnetic block, the circular aperture formed through combination of the arc-shaped grooves has a diameter of 10 to 50 mm, the rubber elastic gasket can effectively prevent direct rigid contact between the anchor rod or cable and the electromagnet part which will otherwise cause damage to the electromagnet block, the rubber elastic gasket is used to change rigid contact into elastic contact, reducing damage to the electromagnet when the anchor rod or cable is broken.

5. A testing method utilizing the anchor rod or cable operating performance testing device designed to simulate fracturation and bed separation based on electromagnetic action of claim 1 , comprising the following steps:
a. adjusting the hydraulic rod of a plurality of hydraulic columns to rise and driving the upper drawing clamping part to move, so that the positions of upper and lower drawing block clamping bodies are adapted to the length of the anchor rod or cable test piece and the extension of block clamping body hydraulic cylinder in the front-end block clamping body drives the terminal of the block clamping body to move upwards obliquely along the front-end block clamping body, thus opening the drawing block clamping body; putting the anchor rod or cable test piece into the opened drawing block clamping body, controlling the clamping body hydraulic cylinder in the drawing block clamping body to contract, so that the terminal of the block clamping body makes downward movement obliquely; closing the clamping part of the drawing block clamping part, so as to clamp and fasten the anchor rod or cable test piece;
b. opening the safety door valve, opening the safety door, adjusting the electromagnetic jacks on both sides to contract, installing the terminal electromagnet and the front-end electromagnet one after another horizontally around the anchor rod or cable test piece, respectively, so as to enwrap the anchor rod or cable test piece, while ensuring that the contact position between the terminal electromagnet, the front-end electromagnet and the anchor rod or cable test piece is located at the rubber elastic gasket;
c. after the electromagnet part has been installed horizontally, closing the safety door part and fixing the safety door valve;
d. pushing the electromagnetic jack to drive the hydraulic pushing baffle, applying horizontal stress to the anchor rod or cable test piece by using the horizontally installed electromagnet part as a whole, so as to simulate the fastening interaction between surrounding rocks and the anchor rod or cable test piece;
e. controlling the hydraulic rods of a plurality of hydraulic columns to rise, so as to apply drawing force to the anchor rod or cable test piece fixed in the drawing block clamping body, and at the same time monitoring the stress variation in the anchor rod or cable test piece by using the block clamping body sensors on the drawing block clamping body;
f. according to the need, reversing the current of internal electromagnetic coils in any electromagnetic block, so as to generate an opposite force, so that the electromagnet part at designated position where the electromagnetic block generating reverse current is located can simulate the bed separation phenomenon caused under the dynamic load of bedded rock mass;
g. continuously monitoring the stress variation in the anchor rod or cable test piece, and recording the changes in the mechanical data of

Assignees

• Univ China Mining

Inventors

• Zhang Nong
• Xie Zhengzheng
• Zhou Junyao
• Yuan Yuxin
• Li Xinyue

Classifications

• G01N2203/005

  Electromagnetic means · CPC title

• G01N2203/0017

  Tensile · CPC title

• G01N2203/0067

  Fracture or rupture · CPC title

• G01N3/06

  Special adaptations of indicating or recording means · CPC title

• G01N3/08 Primary

  by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title