坚硬顶板切顶沿空留巷围岩控制技术

Surrounding Rock Control Technology of Gob-side Retaining Roadway with Hard Roof Cutting Roof

针对目前煤矿存在采掘接替紧张、煤层顶板坚硬而导致回采巷道围岩较难控制等问题,基于平煤二矿高地应力顶板坚硬条件,提出了切顶卸压沿空留巷技术,并进行了工业性试验。研究结果表明:工作面周期来压主要是由工作面的不断对称和采空区上方顶板"O-X"的形成及破断引起的;提出了以"切、补、护、支"为基础的切顶卸压沿空留巷围岩控制机理;留巷巷道两帮平均移近量80 mm,顶板平均下沉量138 mm,留巷变形在合理范围内,成巷效果较好,可为类似地质条件下的切顶卸压沿空留巷提供技术参考。

In view of the problems existing in coal mines,such as the shortage of mining replacement and the difficulty of controlling the surrounding rock of mining roadway due to the hard roof of coal seam,based on the hard condition of high in-situ stress roof in Pingmei No.2 coal mine,the technology of roof cutting and pressure relief along goaf retaining roadway is put forward, and an industrial test is carried out. The results show that the periodic weighting of the working face is mainly caused by the continuous symmetry of the working face and the formation and breakage of "O-X" of the roof above the goaf;the control mechanism of the surrounding rock retained along the goaf by the roof relief based on "cutting, filling, protecting and supporting" is put forward;the average displacement of the two sides of the retained roadway is 80 mm,and the roof subsidence is flat. All of them are 138 mm. The deformation of retained roadway is within a reasonable range,and the effect of roadway formation is better. It can provide technical reference for roof cutting and pressure relief along goaf retained roadway under similar geological conditions.