A Method for Determining the Length of Anchor Rod for Roadway Support

Abstract

The invention discloses a length determining method for an anchor rod for roadway supporting. The length determining method includes the steps that according to the shape of a cross section of a roadway, a circumcircle of a contour line of the roadway is made; then an expansion concentric circle of the circumcircle is made according to the development depth of a surrounding-rock plastic zone, and parameters of the reasonable length of the anchor rod are obtained in the mode that the distance from the surface of the roadway to the expansion concentric circle of the plastic zone, the length that the anchor rod is anchored into hard-and-stable surrounding rock and the exposed length of the anchor rod are superposed. According to the length determining method, the process that the reasonable length of the anchor rod is determined is simple, operation is convenient, the accuracy is high, materials of a rod body of the anchor rod are saved, waste is avoided, the construction speed of drilling is increased, the labor strength of workers is reduced, the surrounding-rock control efficiency of the anchor rod is improved, and the favorable condition is provided for mine safety production.

Description

technical field [0001] The invention relates to the field of mine bolt support parameter design, in particular to a method for determining the length of a roadway support bolt, which is suitable for roadway bolt support parameter design under general conditions. Background technique [0002] Bolt support is an effective means to improve the stability of the surrounding rock of the roadway. The part of the bolt inserted into the rock mass is firmly anchored to the rock mass through the bonding force between the rod body and the adhesive, and between the adhesive and the rock hole wall, and part of the length is exposed in the rock mass. Outside the rock mass, it squeezes the surrounding rock or makes the anchor rod pull the surrounding rock from the inside, so the length of the anchor rod body inserted into the rock mass will directly affect the anchoring force, and then affect the support effect. [0003] At present, the commonly used methods to determine the length paramete...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the generally poor accuracy and relatively complicated deficiencies in the determination of existing bolt length parameters, the present invention provides a method for determining the length of bolts for roadway support. The method is simple to operate, easy to implement, and has high accuracy. Good effect, low labor intensity, high efficiency, high economic benefit

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