Surrounding rock supporting construction method and surrounding rock supporting structure of water-contained roadway of coal mine

Abstract

The invention discloses a surrounding rock supporting construction method of a water-contained roadway of a coal mine and belongs to the field of surrounding rock supporting of underground engineering. The surrounding rock supporting construction method comprises the following steps that (1) primary spraying is conducted after the roadway is excavated; (2) according to the geological conditions of the water-contained roadway, a controllable grouting anchor rod structure is designed, and controllable grouting anchor rod-anchor cable supporting parameters are designed; (3) through the combination of controllable grouting anchor rods, anchor cables, metal nets and sprayed grout supporting, so that a grouting reinforcement waterproof ring is formed, and grout is sprayed onto the surrounding rock on the surface of the roadway; (4) the key portion where supporting needs to be reinforced and water insulation is needed is determined through the field observation technical means such as numerical simulation; (5) the supporting parameters of the water-contained roadway are adjusted and optimized, and grouting reinforcement supporting is conducted on the key portion; and (6) a base plate of the roadway is reasonably supported. The invention further provides a surrounding rock supporting structure. The supporting method and structure are suitable for water-contained roadways with different depths, roadways with broken surrounding rocks, and soft rock roadways; and in addition, construction is easy and convenient, and the supporting method and structure can be popularized within a wide range.

Description

technical field [0001] The invention relates to a mine water-containing roadway support method, in particular to a surrounding rock support construction method and a surrounding rock support structure of a coal mine water-containing roadway, belonging to the field of underground engineering surrounding rock support. Background technique [0002] The stability of coal and rock roadways in coal mines is the basic guarantee for safe production. As coal mines enter deep mining, water-bearing roadways are becoming more and more common. Due to special geological conditions or improper support, if groundwater enters the cracks inside the surrounding rock of the roadway, and at the same time soaks into the voids and micro-cracks inside the rock, the rock will be damaged after a long time. The physical and mechanical properties such as hardness and compressive strength weaken, and even the rock softens and disintegrates, resulting in a decrease in the stability of the roadway surroun...

AI Technical Summary

Problems solved by technology

[0003] At present, the water-bearing roadway support technology mainly adopts bolt-bolt joint support, bracket support, U-shaped steel support and other methods. None of the above methods can prevent groundwater from infiltrating into the surrounding rock of the roadway, resulting in weathering and muddying of the surrounding rock of the roadway roof , there are phenomena such as large local subsidence of the roof, coal wall slabs, water spraying, etc., and there are large safety hazards in the stability of the surrounding rock, and the large deformation of the roadway will increase the support and repair costs at the same time

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