不同破断距下开采覆岩裂隙网络分形特征研究  

Study on fractal characteristics of fracture network in overlying strata mining under different breaking distances

作　　者：刘俊熙 张士川 沈宝堂 肖越 李杨杨[1] 张有成 LIU Junxi;ZHANG Shichuan;SHEN Baotang;XIAO Yue;LI Yangyang;ZHANG Youcheng(College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,Beijing 102209,China;Shandong Dongshan Gucheng Coal Mine Co.Ltd,Jining 272100,China)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]煤炭开采水资源保护与利用国家重点实验室,北京102209 [3]山东东山古城煤矿有限公司,山东济宁272100

出　　处：《山东科技大学学报（自然科学版）》2024年第1期11-21,共11页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(52004147);山东省自然科学基金项目(ZR2020QE129);煤炭开采水资源保护与利用国家重点实验室2020年开放基金项目(GJNY-20-113-19)。

摘　　要：为研究神东矿区不同破断距下开采覆岩裂隙网络分形特征,分析了基本顶周期破断距影响因素,选取大柳塔煤矿52505和上湾煤矿12401工作面进行物理相似模拟实验,探究了不同破断距影响下覆岩裂隙网络分布特征,借助Matlab软件获取不同覆岩裂隙网络分布分形维数,定量描述了覆岩裂隙发育特征,进一步探讨了覆岩裂隙传播影响下不同岩层沉降规律。研究结果表明:影响基本顶周期破断距主要因素包括基本顶厚度、抗拉强度以及承载载荷;大柳塔52505工作面、上湾12401工作面模拟开采平均破断距分别为20和30.4 m;不同破断距下覆岩裂隙网络的分形维数随煤层工作面推进呈现阶梯形增长态势,分形维数可较好地表征覆岩裂隙分布。两工作面最高离层裂隙发育高度与分形维数变化趋势均近似呈非线性正相关;不同破断距对覆岩整体裂隙发育扩展趋势影响显著,工作面回采前期大柳塔52505工作面分形维数相对较低,回采中后期则相反,破断距小,覆岩整体裂隙发育程度相对较高;两工作面覆岩沉降曲线呈“凸”型,近似以采空区中部对称。To investigate the fractal characteristics of the fracture network in overlying strata mining under different breaking distances in Shendong mining area,this study summarized and analyzed the influencing factors of basic roof periodic breaking distance.The 52505 working face of Daliuta coal mine and the 12401 working face of Shangwan coal mine were selected for physical similarity simulation experiments and the distribution characteristics of the overburden fracture network under different breaking distances were explored.With the help of Matlab,the fractal dimension values of different overburden fracture network distributions were obtained and the development characteristics of overburden fracture were quantitatively described.The settlement law of different strata under the influence of overburden fracture propagation was further discussed.The results show that the main factors affecting the periodic fracture distance of the main roof include the thickness,the tensile strength,and the bearing load of the main roof.The average breaking distances of simulated mining in Daliuta 52505 working face and Shangwan 12401 working face are 20 and 30.4 m respectively.The fractal dimension of the overburden fracture network under different breaking distances shows a stepwise growth trend with the advancement of the coal seam working face,and the fractal dimension can better characterize the distribution of overburden fractures.The variation trend of the highest separation fracture development height and fractal dimension of the two working faces is an approximately nonlinear positive correlation.Different breaking distances have a significant impact on the development and expansion trend of the overall fracture of the overlying strata.The fractal dimension value of Daliuta 52505 working face is relatively low in the early stage of working face mining,but it is opposite in the middle and late stages of mining.The fracture distance is small,and the overall fracture development degree of the overlying rock is relatively highe

关 键 词：破断距 覆岩运动 覆岩裂隙网络 分形维数 周期来压 

分 类 号：TD325[矿业工程—矿井建设]