密实膏体充填面沿空留巷围岩稳定性控制研究

Study on Stability Control of Surrounding Rock of Retained Roadway along Goaf on Dense Paste Filling Face

为减少区段煤柱的留设,提高建筑物下遗留煤柱的回采率,以岱庄煤矿2353工作面运输平巷沿空留巷为背景,提出"采空区密实膏体-巷内支护体-实体煤"共同作用于上覆岩层的联合控制系统,通过构建FLAC^(3D)模型,明确影响膏体充填面沿空留巷围岩稳定性的3个因素的合理取值,模拟结果表明:工作面充填率为95%,膏体强度为5 MPa,木桩排距与采高比为1∶3时可进一步强化围岩控制;同时依据该矿地质条件,给出了沿空巷道加固支护方案。现场施工后,监测到顶板最大下沉量为137 mm,两帮最大移近量为290mm,围岩变形量在允许范围内,满足邻近2354工作面的使用要求。

In order to reduce the reserve of section coal pillar and to improve the recovery rate of the coal pillar under the building,the joint control system of'dense paste in goaf roadway support body-solid coal in the overlying strata'was put forward based on the background of retained roadway along goaf on the 2353 working face in Daizhuang coal mine.Through the construction of FLAC3Dmodel,the reasonable value of three factors affecting the stability of surrounding rock of retained roadway along goaf on paste filling face were determined.The simulation results showed that when the filling rate was 95%,the paste strength was 5 MPa,and the ratio of pile spacing and mining height was 1∶3,the control of the surrounding rock could be further strengthened.According to the geological conditions of Daizhuang mine,the reinforcement support scheme of the roadway along the goaf was proposed.After site construction,the maximum subsidence of the roof was detected to be 137 mm,the maximum displacement was 290 mm,and the deformation of surrounding rock was within the allowable range,which met the use requirements of the adjacent 2354 working face.