A high-stress rock burst roadway bolt, design method and working method

Abstract

A high-stress rock burst roadway bolt, design method and working method are suitable for underground use in coal mines. It includes a nodular anchor rod body, a lock at the end of the anchor rod, a force transmission tray and a sleeve. The nodular anchor rod body is provided with protrusions at intervals. The tail end of the nodular anchor rod body is provided with threads, and the threads are sequentially provided with The power transmission tray and the lock at the end of the anchor rod. The outer body of the nodular anchor rod is provided with a sleeve. The sleeve is a metal tube with a through-slit in the axial direction. The concave structure matched with the protrusion on the shape anchor rod body. It has the advantages of high anchoring force, high pre-tightening force, and local breakage without affecting the overall anchoring effect, which can effectively avoid the harsh anchoring conditions of ordinary anchor bolts, local breakage, easy overall failure, small allowable deformation, and inability to adapt to high stress, large deformation, and strong anchorage. Shock dynamic pressure, rock crushing engineering environment and other issues.

Description

technical field [0001] The invention relates to a roadway anchor rod for high stress impact rock pressure, a design method and a working method, and is especially suitable for a roadway anchor rod for high stress impact rock pressure used in coal mine underground roadways, a design method and a working method. Background technique [0002] Anchor is an important supporting material in the fields of mining engineering, hydropower engineering, slope engineering and underground engineering. At present, there are three main ways to generate the anchoring force of anchor bolts: through the chemical bonding of resin anchoring agents, the stretching and expansion of inverted wedge structures, or friction. The common anchors mainly include resin anchored rebar anchors, round steel Twist head bolts, mechanical inverted wedge bolts, expansion shell bolts, glass fiber reinforced plastic bolts, etc. There are mainly the following disadvantages: [0003] Resin coil anchor bolts have hi...

AI Technical Summary

Problems solved by technology

[0006] Whether it is a resin coil anchor or a mechanical inverted wedge anchor, the allowable deformation is only the elongation of the rod body, which cannot meet the large deformation and impact resistance requirements of the high-stress impact rock roadway

[0007] Although the expansion shell anchor can provide anchoring force through the friction between the rod body and the hole wall, so as to achieve the effect of full-length anchoring and adapt to large deformation, but the anchoring force is low, and it cannot provide high pre-tightening force

[0008] Both the resin coil anchor and the mechanical inverted wedge anchor obtain the pre-tightening force through bolt fastening, which makes the anchor simultaneously subjected to complex stresses of tension, compression, torsion, and shear, and the bearing capacity is greatly reduced

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