Pressure relief and monitoring method for continuous large deformation of deep roadway coal side

Abstract

The invention discloses a pressure relief and monitoring method for continuous large deformation of deep roadway coal sides. The pressure relief and monitoring method mainly aims at solving the problems that continuous large deformation of two sides of a deep roadway and damage of a support system have to be expanded, brushed and repaired all the time to guarantee functions of the roadway, and themaintenance cost is greatly increased. According to the pressure relief and monitoring method for continuous large deformation of the deep roadway coal sides, large pressure relief hole groups parallel to the axial direction of the roadway are arranged in the deep areas of the two sides of the roadway, surrounding rock deformation energy can be partially released, the bearing stress peak values of the two sides can be greatly transferred to the deep part, and meanwhile a large compensation space is provided for continuous migration of deep coal bodies to the roadway space; the pressure reliefholes are drill holes having different numbers and manners and constructed by arranging drill sites on two sides of the roadway, and have different diameters by means of radial hydraulic jet flow ormechanical hole expansion; and stress and deformation monitoring systems are arranged on the two sides of the roadway, when stress and deformation are increased, that is, after the hole groups are closed, the pressure relief hole groups are implemented again, long-time effective monitoring and control of deep coal roadway surrounding rocks are achieved, and the roadway maintenance work amount andcost are greatly reduced.

Description

technical field [0001] The invention belongs to the field of coal mining and relates to a pressure relief and monitoring method for continuous large deformation of coal sides in deep roadways. Background technique [0002] At present, my country's coal mining has entered into deep mining. Under complex geological production conditions such as deep high stress and soft coal, there are control problems such as continuous large deformation of the two sides of the roadway and damage to the support system. The more effective supporting methods to control the deformation of the roadway surrounding rock are grouting reinforcement and steel tube concrete support. Under complex conditions such as deep high stress, grouting reinforcement can only control the deformation of the two sides of the roadway in a short time; steel tube concrete support It can effectively solve the problem of roadway continuous renovation to a certain extent, but it is expensive and will eventually be damaged...

AI Technical Summary

Problems solved by technology

[0010] The technical solution adopted in the present invention is: a pressure relief and monitoring method for continuous large deformation of deep roadway coal sides, including pressure relief hole groups, drilling stress monitoring system, anchor cable stress monitoring system and roadway two side displacement monitoring The system uses the pressure relief hole group to solve the problem of continuous large deformation of coal sides in deep roadways. The stress monitoring system for boreholes, the stress monitoring system for anchor cables and the displacement monitoring system for the two sides of the roadway form a force and deformation monitoring system; the stress monitoring system for boreholes The system is composed of a number of drilling stress gauges arranged in the middle of the roadway side. The anchor cable stress monitoring system is composed of a number of hydraulic pillows arranged between the anchor cable channel steel and the anchor cable tray. The displacement monitoring system of the two sides of the roadway is It consists of a number of cross measuring points. The drilling stress monitoring system, the anchor cable stress monitoring system and the roadway two side displacement monitoring system are arranged before the pressure relief hole group to monitor the stress in the early stage of the roadway and after the pressure relief hole group is arranged. At the same time, the cross method is used to measure the change of the displacement of the roadway before and after pressure relief. Through the comparison of stress and deformation before and after pressure relief, the effect and degree of pressure relief of the pressure relief hole group are evaluated, and it also provides a basis for further pressure relief. , when the stress of the drilling stress gauge and hydraulic pillow in the force and deformation system increases, and the displacement of the two sides increases, further pressure relief is required; Parallel to the direction, the pressure relief hole group is composed of a variety of holes with different diameters and has a variety of arrangements. The arrangement of the pressure relief hole group can partially release the deformation energy of the surrounding rock and greatly transfer the peak stress of the two sides of the support to the deep. The continuous migration of the deep coal body to the two sides of the roadway provides a large compensation space; the specific implementation methods and steps are as follows:

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