巨厚煤层覆岩裂隙演化规律及扩展机理研究  

Crack evolutionary law and propagation mechanism of overlying rock of extremely thick coal seam

作　　者：彭宝山 张建功 谭立 师为战 刘志腾 王昊 PENG Baoshan;ZHANG Jiangong;TAN Li;SHI Weizhan;LIU Zhiteng;WANG Hao(Zhundong No.2 Mine,CHN Energy Group,Changji 831100,China;College of Energy Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]国家能源集团准东二矿,新疆昌吉831100 [2]西安科技大学能源学院,陕西西安710054

出　　处：《陕西煤炭》2025年第4期35-40,94,共7页Shaanxi Coal

摘　　要：为探索深埋巨厚煤层地质条件下覆岩裂隙发育及“两带”发育特征,以准东二矿为工程背景,采用数值模拟和物理相似模拟相结合的研究方法,揭示巨厚煤层综放工作面覆岩裂隙演化规律及扩展机理,并以此为依据确定“两带”的发育高度。结果表明,覆岩裂隙场呈梯形分布,垮落带内裂隙相互贯通、交叉形成复杂裂隙网络,裂隙带内侧以竖向裂隙为主;局部拉应力集中导致接触断裂萌生微裂隙,随着工作面推进距离增加,微裂隙逐渐扩展并相互贯通。相似模拟结果表明,覆岩裂隙发育呈现随开采空间增大逐渐向高层位发育趋势,在走向方向裂隙呈现“萌生-张开-增大-减小-闭合”的演变过程;相似模拟和数值模拟得到垮落带最大高度分别为92 m和96 m,裂隙带均发育至地表,两种研究方法所得“两带”发育规律基本一致。In order to explore the development characteristics of overlying strata cracks and“two zones”under the geological conditions of deep-buried and extremely thick coal seam,taking Zhundong No.2 Mine as the engineering background,the method of combining numerical simulation and physical similarity simulation is adopted to reveal the evolution law and propagation mechanism of overlying strata cracks in fully mechanized top-coal caving face in extremely thick coal seam,and the development height of“two zones”is determined.The results show that the overlying strata fracture field is trapezoidal,and the cracks in the caving zone are interconnected and crossed to form a complex fracture network.Local tensile stress concentration leads to contact fracture-initiated micro-cracks,and with the increase of working face advancing distance,micro-cracks gradually expand and connect with each other.On the surface of similar simulation results,the development of overlying strata fractures tends to be higher with the increase of mining space,and the evolution process of fractures in the strike direction is“initiation-opening-increasing-decreasing-closing”.The maximum heights of the caving zone obtained by similar simulation and numerical simulation are 92 m and 96 m,respectively,and the fracture zone develops to the surface.The development laws of the two zones obtained by the two research methods are basically the same.

关 键 词：巨厚煤层 裂隙扩展 “两带”高度 相似模拟 数值模拟 

分 类 号：TD325[矿业工程—矿井建设]