急倾斜特厚煤层开采煤岩应力场-位移场演化规律数值模拟  

Numerical Simulation of Evolution Law for Stress-displacement Field of Coal-rock Mass in Steeply-inclined and Extra-thick Coal Seam

作　　者：朱帛繁 王正义 李心涵 赵棪 朱永恒 邱翊 ZHU Bofan;WANG Zhengyi;LI Xinhan;ZHAO Yan;ZHU Yongheng;QIU Yi(School of Civil Engineering and Architecture,Changzhou Institute of Technology,Changzhou 213032,China)

机构地区：[1]常州工学院土木建筑工程学院,江苏常州213032

出　　处：《矿业工程研究》2023年第3期38-44,共7页Mineral Engineering Research

基　　金：江苏省高校大学生创新创业训练计划资助项目(202111055051Y);江苏省高等学校自然科学研究资助项目(20KJB440001)。

摘　　要：为了揭示急倾斜特厚煤层开采矿压显现规律,建立急倾斜特厚煤层工作面数值分析模型,研究水平分段开采过程的应力场-位移场演化规律,确定矿压防治的重点区域,提出针对性的防治建议.结果表明:急倾斜特厚煤层开采煤岩应力场呈现非对称分布特征,顶板侧煤岩处于外错应力集中区,底板侧煤岩处于上方采空卸压区,顶板侧煤岩是防治的重点区域;急倾斜特厚煤层开采工作面煤体变形以底煤底鼓为主,呈现中间大两侧小的“单峰”分布;煤岩位移场演化受开采深度影响显著,上覆岩层随开采深度增大依次发生破断;通过顶板预处理和煤岩体强度弱化可实现对急倾斜特厚煤层开采矿压显现的有效防治.In order to reveal the regularity of mine pressure behaviors in steeply-inclined and extra-thick coal seams,the numerical analysis model for working faces is established to analyze the evolution law for stress-displacement field of coal-rock mass during the horizontal section mining process.The key areas of mine pressure prevention are determined,and the targeted control suggestions are put forward.Results show that the stress field of coal-rock mass in steeply-inclined and extra-thick coal seam shows the asymmetric distribution characteristics.The coal-rock mass on the roof side is in the exterior stress concentration zone,while the coal-rock mass on the floor side is the distressed zone under the goaf.Therefore,the coal-rock mass on the roof side is the key area of mine pressure prevention.The coal deformation in the working face is dominated by the heaving floor of bottom coal,showing a“single peak”distribution with largeness in the middle and smallness on both sides.The evolution of displacement field for coal-rock mass is significantly affected by the mining depth,and the overlying strata break is in turn with the increase of the mining depth.The effective prevention of mining pressure behavior in steeply-inclined and extra-thick coal seam can be realized through the roof pretreatment and intensity weakening of coal-rock mass.

关 键 词：急倾斜特厚煤层 采动应力 数值模拟 矿压显现 防治 

分 类 号：TD324[矿业工程—矿井建设]