Honeycomb-like energy-absorbing yielding anchor rod/anchor cable and implementation method thereof

Abstract

The invention discloses a honeycomb-like energy-absorbing yielding anchor rod / anchor cable and an implementation method thereof.The honeycomb-like energy-absorbing yielding anchor rod / anchor cable comprises an anchor rod / anchor cable body and a fastening / locking device, and the anchor rod / anchor cable body is composed of solid threaded cylindrical rod body sections / steel strand sections at the two ends and a stress deformation coordinating section in the middle; the middle stress deformation coordinating section is a honeycomb-like cylindrical rod body, and the honeycomb-like cylindrical rod body is an intercommunicated rhombic grid body seen from the surface of the cylindrical rod body and the cross section of the cylindrical rod body. When the surrounding rock is separated or dislocated, the surrounding rock generates large tensile stress or shearing force on the anchor rod / anchor cable, the rhombic holes are subjected to transverse or radial plastic deformation to store a part of strain energy, and therefore the effect of absorbing energy is achieved, and yielding is achieved. By means of the method, dynamic coordination and consistency of anchor rod deformation and surrounding rock deformation are achieved, the stability of the whole supporting structure can be kept, and anchor rod / anchor cable breakage caused by stress concentration at some local positions is avoided.

Description

technical field [0001] The invention belongs to the field of mine safety, and relates to roadway or tunnel support equipment, in particular to an anchor rod or anchor cable that absorbs energy and pressure, and belongs to end anchor support equipment. Background technique [0002] With the scale of coal mines and the application of large-scale, high-efficiency, automated, and intelligent mining equipment, most of the mining areas in the east (Jixi, Kailuan, Zaozhuang, Jining, Xuzhou, Huainan, etc.) Extend deep. After entering deep mining, the deep roadway is affected by high ground stress and strong mining stress, and dynamic disasters such as rock burst occur frequently. According to incomplete statistics, more than 80% of rock burst accidents occur in mining roadways, and the prevention and control of rock burst in mining roadways has become the key to surrounding rock control. Rockburst roadway anti-collision support is the last barrier for rockburst protection. At pres...

AI Technical Summary

Problems solved by technology

Although this invention takes into account the failure of the bolt under shear stress, its control of the surrounding rock is the combined effect of the bolt and the anchor cable, and the shear resistance and transverse elongation of the bolt itself have not been significantly improved.

[0007] (4) Chinese Patent Publication No. CN107227967A discloses a constant-resistance large-deformation yielding anchor rod or anchor cable. The anchor rod or anchor cable device can be sequentially segmented and constant-resistance yielding, which protects the overall strength of the anchor rod or anchor cable, and Large deformation displacement distance

For underground engineering under complex geological conditions such as large buried depth and high ground stress, when there is a weak structural plane in the surrounding rock, the mutual displacement of the rock masses on both sides of the structural plane will cause the anchor rod or The anchor cable bears a large shear force. At this time, the anchor rod or anchor cable is easy to shear and break, and loses the ability to control the stability of the surrounding rock, and even induces the failure of the entire support system, which seriously threatens the safety of coal mine production.

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