倾斜厚煤层采动覆岩裂隙演化规律数值模拟  

Numerical simulation on fracture field evolution law of mining-induced overburden in inclined thick coal seam

作　　者：何清波 张文进 王绪友 姜亦武 宁廷洲 杨俊生 孙红星 贺海瑞 HE Qingbo;ZHANG Wenjin;WANG Xuyou;JIANG Yiwu;NING Tinzhou;YANG Junsheng;SUN Hongxing;HE Hairui(Liuhuanggou Coal Mine,Yankuang Xinjiang Mining Industry Co.,Ltd.,Changji 831100,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]兖矿新疆矿业有限公司硫磺沟煤矿,新疆昌吉831100 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《西安科技大学学报》2022年第6期1080-1087,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(51974237)。

摘　　要：为准确掌握倾斜厚煤层采动覆岩裂隙演化规律,对井下煤体回采中瓦斯抽采系统的布置提供依据,以新疆某高瓦斯矿井倾斜厚煤层工作面为试验原型,通过数值解算方法对回采过程进行模拟,掌握倾斜厚煤层采动覆岩裂隙高度发育范围,通过分析覆岩位移与顶板应力的变化规律,明确倾斜厚煤层采动裂隙演化规律。结果表明:倾斜厚煤层工作面采动覆岩总体垮落形态沿煤层走向呈轴对称梯台状分布,沿倾向呈非对称垮落椭抛带形态;应力集中系数在覆岩裂隙区与压实区的边界处发生突变,应力峰值与推进距成正比关系;第1层阶梯所处区域为冒落带,即0~20 m,第2层阶梯所处区域为裂隙带,即20~65 m,研究结果有效掌握了倾斜煤层采动覆岩裂隙演化规律,为倾斜厚煤层中瓦斯系统布置提供参考,对实现倾斜厚煤层工作面的安全高效开采具有一定的意义。To accurately grasp the evolution law of mining-induced overburden fractures in inclined thick coal seams and provide a basis for the arrangement of gas extraction systems in underground coal mining,the working face of inclined thick coal seams in a high-gas mine in Xinjiang was used as an experimental prototype.The numerical simulation method was adopted to simulate the mining process,and the height development range of mining-induced overburden fractures in inclined thick coal seams was determined.By analyzing the change law of overburden displacement and roof stress,the evolution law of mining fissures in inclined thick coal seam was clarified.The results show that the overall caving form of mining overlying strata in inclined thick coal seam working face presents axisymmetric ladder-like distribution along the strike of coal seam and asymmetric caving elliptic parabolic distribution along the tendency.The stress concentration factor mutates at the boundary between the overburden fracture zone and the compaction zone,and the peak stress is proportional to the advance distance.According to the numerical simulation results,the area of the first step is located in the caving zone,that is,0~20 m,and the area of the second step is located in the fractured zone,that is,20~65 m.The research results confirm the fracture evolution law of overlying strata in inclined coal seam,which provides a reference for gas system layout in inclined thick coal seam.The research is of great significance for the safe and efficient mining of inclined thick coal seam.

关 键 词：倾斜厚煤层 数值模拟 采动位移-应力场 覆岩裂隙 

分 类 号：TD73[矿业工程—矿井通风与安全]