An optimization method for regional stress field in main road

Abstract

Disclosed is a regional stress field optimization method for a main haulageway (1). First, before boring the main haulageway (1), measuring the crustal stress at passageways near and in communication with the main haulageway (1); calculating and analyzing the position of the greatest difference of principal stress (3) on the wall after the main haulageway (1) is bored; boring multiple pressure-relieving passageways (2) near the main haulageway (1) at appropriate layers above or below the position of the greatest difference of principal stress (3), and using the pressure-relieving passageways (2) to relieve the pressure of the main haulageway (1); constructing from the inside of the pressure-relieving passageways (2) floor stress optimization holes (4) toward the position of the greatest difference of principal stress (3), and performing static blasting; after the pressure-relieving passageways (2) deform to a certain degree, boring the main haulageway (1), and measuring, inside of the main haulageway (1), the crustal stress and calculating the position of the greatest difference of principal stress (3) on the wall; constructing from the inside of the main haulageway (1) a wall stress optimization hole (5) toward the position of the greatest difference of principal stress (3) on the wall, and performing static blasting to relieve pressure, thereby optimizing the regional stress field of the main haulageway (1). The present method relieves the pressure using pressure-relieving passageways and performs static blasting twice to relieve pressure, once before the boring and once after the boring, at the position of the greatest difference of principal stress on the wall, thereby optimizing the regional stress field of the main haulageway with good effects.

Description

technical field [0001] The invention relates to a method for optimizing the regional stress field of a roadway, which is especially suitable for maintaining and treating deep mine roadways, and belongs to the technical field of roadway support. Background technique [0002] The main lane is the first roadway to be excavated in the coal mine roadway system. It belongs to the development roadway and is responsible for the whole mine or several horizontal coal transportation, material transportation, ventilation, drainage, pedestrians and other tasks, and the service life is generally as long as several decades. Therefore, the maintenance of the main road is an important link in the production of coal mines. After entering deep mining, due to the increase of mining depth, the ground stress on the roadway increases, especially the ground stress dominated by horizontal stress makes the deformation of the roadway intensified. The deep mine roadway is not as easy to maintain as the...

AI Technical Summary

Problems solved by technology

[0003] Technical problem: The purpose of the present invention is to solve the problem that the deformation of deep wells and roads is serious, and the roadway section needs to be expanded regularly, and to provide a method that can control the deformation of deep wells and roads and effectively optimize the stress field in the roadway area

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