Working face double-roadway tunneling small coal pillar reinforcement construction method

Abstract

The invention provides a working face double-roadway tunneling small coal pillar reinforcement construction method, and relates to the technical field of coal mining and roadway support. The working face double-roadway tunneling small coal pillar reinforcement construction method comprises the steps that double-roadway tunneling is arranged on a working face, and 3-5m small coal pillars are reserved between roadways; two-ended cables are installed on the small coal pillars, so that the coal pillars are in a three-dimensional stress state; grouting anchor rods are arranged on the two sides of the small coal pillars to control surrounding rock fractures, and the integrity of the coal pillars is ensured; suspension anchor cables are installed to reinforce the connection of the coal pillars and overlaying strata to prevent the coal pillars from slipping; a coal side is reinforced by concrete filled steel tube tubular piers to improve the carrying capacity of the coal pillars to control side bulging; and advance pre-roof-breaking pressure relief is carried out during the stoping period, and the bearing pressure above the coal pillars is reduced. According to the working face double-roadway tunneling small coal pillar reinforcement construction method, the stability of the small coal pillars in the tunneling and stoping process is ensured, the problem of tense replacement of mine working faces can be solved through double-roadway tunneling, and the mining rate can be improved by arranging the small coal pillars; and in addition, the bearing capacity of the small coal pillars is further improved, the long-term stability of the small coal pillars is ensured, and double-roadway tunneling of the small coal pillars is realized.

Description

technical field [0001] The invention relates to the technical field of coal mining and roadway support, in particular to a small coal pillar reinforcement construction method for double-lane excavation on a working face. Background technique [0002] Traditional double-lane excavation can achieve sequential mining at the working face and ensure normal excavation succession; however, based on the consideration of mine pressure control, a 10-30m protective coal pillar is generally reserved, which will cause a lot of waste of coal resources. At present, most coal mines adopt gob-side excavation. Although the width of the coal pillar is reduced and the resource recovery rate is improved, the excavation is relatively close to the goaf, and it is easily affected by the movement of the rock above the gob. Generally, there is a lag period of 6 to 10 months for digging, which will bring about the problem of tension in mining replacement. The current support control technology for sm...

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Problems solved by technology

[0003] In order to solve the problem of difficult stability control of the small coal pillars left in double-lane excavation affected by mining, ensure the succession of excavation in the working face, improve the coal recovery rate, and improve the bearing capacity of the small coal pillars, the present invention provides a working face The construction method of small coal pillar reinforcement by double-lane excavation, the specific technical scheme is as follows

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