Study on stability of goaf overlying strata with "110 construction method" in Shennan mining area
张卫陈玉涛倪倩臧立岩
ZHANG Wei;CHEN Yutao;NI Qian;ZANG Liyan
山西能源学院 地质与测绘工程系中煤科工集团重庆研究院有限公司山西地质博物馆煤炭工业太原设计研究院集团有限公司
以神南矿区为工程背景,采用岩体微观室内实验、现场监测、物理模拟实验(DIC监测、应变监测)和FLAC3D数值模拟方法,分析了矿区主要岩层岩体结构特征,获得了“110工法”(一种新型的无煤柱开采技术)开采工艺下采空区上覆岩体位移场和应力场的演变规律。研究结果表明:神南矿区岩体节理裂隙发育程度较高,岩体质量等级较差;110工法利用岩体的碎胀效应和高恒阻能量吸收锚索补偿力学支护特性,在千米级埋深的煤层开采中仍具有良好的沿空留巷效果;110工法下的采空区位移沉降从大到小依次为中部区域、切线侧区域、非切线侧区域。110工法的切顶卸压和高恒阻能量吸收锚索的联合开采技术,可为其他地下空间中大变形软弱围岩的稳定性研究提供科学依据。
Based on the engineering charateristics of Shennan mining area, the structural features of the main rock layers in the mining area were analyzed by rock microscopical laboratory experiments, field monitoring, physical simulation experiments (DIC monitoring and strain monitoring), and FLAC3D numerical simulation.The evolution laws of the displacement and stress fields of overlying rock in goaf under the mining technology of " 110 construction method" (a new mining technology without coal pillar) were obtained.The research results show that the rock mass in Shennan mining area has a high degree of joint fracture development and the quality grade of rock mass is low.The "110 construction method" provided a improved gob-side entry retaining in the mining of coal seam with kilometer level burial depth by using the fragmentation and expansion effect of rock mass and high constant resistance energy absorbing anchor cable compensating mechanical support characteristics.The settlement displacement intensity of the mining area under the "110 construction method" is central area > tangent side area > non-tangent side area.The combined mining technology of "110 construction method" consisted with roof cutting, pressure relief and high constant resistance energy absorbing anchor cable is capable providing scientific bases for the stability study of large deformation and weak surrounding rock in underground space engineering other than coal mining.
采空区110工法干湿循环数值模拟物理模型
goaf;110 construction method;wetting-drying cycle;numerical simulation;physical model
主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会