缓倾斜浅埋煤层覆岩裂隙演化与分形表征研究  

Study on Fracture Evolution and Fractal Characterization of Overlying Strata in Gently Inclined Shallow Coal Seam

作　　者：蒯琛 左宇军[1,2] 郑禄林 林健云 陈斌 陈庆港 荣鹏 KUAI Chen;ZUO Yujun;ZHENG Lulin;LIN Jianyun;CHEN Bin;CHEN Qinggang;RONG Peng(Mining College,Guizhou University,Guiyang 550025,China;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州大学资源与环境学院,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2024年第6期49-56,共8页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金资助项目(51964006,52164007);贵州省科技支撑计划资助项目(黔科合支撑[2022]一般247,黔科合支撑[2022]一般248);贵州省高层次创新型人才培养资助项目(黔科合人才[2016]4011号);贵州省矿山动力灾害预警与控制技术科技创新人才团队资助项目(黔科合平台人才[2019]5619)。

摘　　要：厘清采动覆岩导水裂隙演化规律对顶板防治水研究具有重要意义。以龙凤煤矿9#煤层120910综采工作面为工程背景,通过相似模拟和数值模拟方法,对缓倾斜浅埋煤层覆岩裂隙演化规律进行了研究。结果表明:煤层采动顶板导水裂隙带发育高度将贯穿长兴组含水层底界,工作面推进过程中存在突水危险性,并将覆岩裂隙演化过程分为4个阶段,即裂隙发育阶段、顶板垮落阶段、裂隙压实阶段、整体稳定阶段;同时引入分形理论,定量描述了采动覆岩裂隙演化过程,裂隙演化4个阶段的分形损伤度ω分别为0.676、0.702、0.638、0.639,当ω≥0.68时,岩体破裂现象越明显。研究结果可为相似地质条件下上覆岩层顶板防治水研究提供参考。It is of great significance to clarify the evolution law of water-conducting fissure in mining overlying rock for the study of water control in roof.Based on 120910 fully mechanized mining face of No.9 coal seam in Longfeng Coal Mine as engineering background,the evolution law of overlying rock fractures in gently inclined shallow coal seam is studied by means of similarity simulation and numerical simulation.The results show that the development height of water-conducting fracture zone in coal seam mining roof will run through the bottom boundary of the Changxing Formation aquifer,and there is a risk of water inrush during the advancing process of the working face.The evolution process of overburden rock fracture can be divided into four stages,namely,fracture development stage,roof caving stage,fracture compaction stage and overall stability stage.At the same time,fractal theory is introduced to quantitatively describe the fracture evolution process of mining overburden rock.The fractal damage degree ω in four stages of fracture evolution is 0.676,0.702,0.638 and 0.639,respectively.Whenω≥0.68,the rock mass fracture phenomenon is more obvious.The results can provide reference for the study of water control in overlying strata roof under similar geological conditions.

关 键 词：缓倾斜煤层 裂隙演化 分形损伤度 相似模拟 数值模拟 

分 类 号：TD82[矿业工程—煤矿开采]