特厚煤层综放采场沿空掘巷优化设计与应用

Optimum Design and Application of Roadway Driving along Next Goaf in Extra-thick Coal Seam

针对特厚煤层综放开采小煤柱沿空掘巷和错层位沿空掘巷2种方式,以兴隆庄矿3304(下)综放工作面为工程背景展开研究。首先,基于极限平衡理论和矿压理论,确定了2种沿空掘巷方式下的煤柱尺寸范围和滞后时间;在此基础上,结合采场支承压力现场实测结果,确定了2种掘巷方式下的合理煤柱尺寸,其中:小煤柱为3.5 m,错层位为0.95 m;最后,通过工程实践表明,采用错层位布置沿空巷道更有利于控制围岩的变形,不仅可以提高煤炭采出率,还可以避免留小煤柱护巷产生过大集中应力导致巷道失稳事故的发生。研究成果可为类似地层条件的工程设计提供理论支持和工程借鉴。

The research is carried out on the engineering background of the 3304(lower) fully mechanized caving face in Xinglongzhuang coal mine, aiming at the two ways of mining small coal pillar along the caving roadway and along the roadway of stagger arrangement in the fully-mechanized caving mining of extra-thick coal seam. Firstly, based on the theory of limit equilibrium and the theory of ore pressure, the size range and delay time of coal pillar are determined under two kinds of roadway excavation methods. On this basis, combining with the field measurement results of the supporting pressure in the stope, the reasonable coal pillar size under the two methods of roadway excavation is determined, among which, the small coal pillar is 3.5 m and the stagger arrangemen is 0.95 m. Finally,the engineering practice shows that the use of stagger arrangement along the roadway is more conducive to controlling the deformation of the surrounding rock, which can not only improve the coal recovery rate, but also avoid the occurrence of roadway instability accident caused by excessive concentrated stress caused by retaining a small coal pillar. The research results can provide theoretical support and engineering reference for engineering design of similar formation conditions, and have good economic benefits and broad application prospects.