软硬互层覆岩结构影响卸压瓦斯运–储区交叉融合的厚度比效应  

Structure of soft and hard interbedded overburden rock under the influence of thickness ratio affects the cross fusion of pressure relief gas transportation and storage area

作　　者：赵鹏翔 裴文博 李树刚 林海飞 卓日升 常泽晨 邵秋冬 马晓川 ZHAO Pengxiang;PEI Wenbo;LI Shugang;LIN Haifei;ZHUO Risheng;CHANG Zechen;SHAO Qiudong;MA Xiaochuan(School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Western Mining Gas Intelligent Extrac-tion Engineering Research Centre,Xi'an 710054,China;Xinjiang Key Laboratory of Intelligent Prevention,Control and Emergency Response to Coal Mine Disasters,Xinjiang College of Engineering,Urumqi 830023,China;Xinjiang Uygur Autonomous Region Coal Research Institute,Xinjiang Coal and Coalbed Methane Engineering Technology Research Centre,Urumqi 830091,China;Heze Tengda Coal Mine,Xinjiang Changji Heze Tengda Mining Co.,Ltd.,Changji 831100,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]西部矿井瓦斯智能抽采工程研究中心,陕西西安710054 [3]新疆工程学院新疆煤矿灾害智能防控与应急重点实验室,新疆乌鲁木齐830023 [4]新疆维吾尔自治区煤炭科学研究院新疆煤及煤层气工程技术研究中心,新疆乌鲁木齐830091 [5]新疆昌吉市菏泽腾达矿业有限责任公司菏泽腾达煤矿,新疆昌吉831100

出　　处：《煤炭科学技术》2025年第2期163-177,共15页Coal Science and Technology

基　　金：国家重点研发计划资助项目(2023YFC3009004);新疆煤炭资源绿色开采教育部重点实验室开放课题资助项目(KLXGY-KA2404);国家自然科学基金面上资助项目(52174205)。

摘　　要：为掌握软硬互层覆岩结构影响卸压瓦斯运–储区交叉融合的厚度比效应,以不同厚度比的软硬互层覆岩结构为试验对象,利用二维物理相似模拟试验平台,开展软硬互层覆岩结构裂隙演化及破断机制试验,并结合分形理论定量描述软硬互层覆岩结构裂隙分布特征,根据采动覆岩椭抛带理论,同时引入回转角、贯通度、裂隙率等特征参数,研究软硬互层覆岩结构瓦斯运移区和储集区交叉融合动态变化特征受软硬互层结构厚度比的影响。试验结果表明:瓦斯的运–储区内外边界和运–储交界分别位于分形维数、裂隙贯通度、破断回转角与裂隙率的突变区域,运移区破断回转角大于2.07°,储集区破断回转角为1°~2.07°。瓦斯运移区和储集区破断裂隙贯通度分别为0.6~1.0和0.2~0.6;根据瓦斯运–储区裂隙率、回转角、贯通度的变化,确定瓦斯运移区、储集区与交叉融合区边界,裂隙率、回转角、贯通度呈现先快速减小,后减小速率明显减缓,最后减小速率再次增大的趋势;软硬互层覆岩经历运–储区开始形成、运移区与储集区首次出现、交叉融合区初次形成、交叉融合区扩大、运–储区与交叉融合边界逐渐模糊5个时期,最终形成完整的椭圆抛物带状的覆岩裂隙场;建立软硬互层覆岩结构瓦斯运–储区厚度比效应量化表征模型,同时根据瓦斯运–储区表征参数确定其边界及状态判定流程,确定软硬互层覆岩结构上覆岩层裂隙演化及破断机制。In order to grasp the thickness ratio effect of soft and hard interbedded overburden structure on the cross–fusion of pressure lief gas transportation and storage area,the soft and hard interbedded overburden structure with different thickness ratios was taken test object,and the two–dimensional physical similarity simulation experiment platform was used to carry out the crack evolution and breaking mechanism experiment of soft and hard interbedded overburden structure.Combined with the fractal theory,the fracture distribu-tion characteristics of soft and hard interbedded overburden structure were quantitatively described.According to the theory of mining overburden elliptic paraboloid zone,the characteristic parameters such as rotation angle,penetration degree and fracture rate were intro-duced to study the dynamic change characteristics of cross–fusion of gas migration area and reservoir area in soft and hard interbedded overburden structure affected by the thickness ratio of soft and hard interbedded structure.The experimental results show that the internal and external boundaries of the gas transport–storage area and the transport–storage boundary are located in the mutation areas of fractal di-mension,fracture penetration,fracture rotation angle and fracture rate,respectively.The fracture rotation angle of the migration area is greater than 2.07°,and the fracture rotation angle of the reservoir area is 1°~2.07°.The fracture connectivity of gas migration area and reservoir area is 0.6~1.0 and 0.2~0.6,respectively.According to the changes of fracture rate,rotation angle and penetration degree in gas transportation–reservoir area,the boundary of gas migration area,reservoir area and cross fusion area is determined.The fracture rate,rota-tion angle and penetration degree decrease rapidly at first,then the decrease rate slows down obviously,and finally the decrease rate in-creases again.The overlying strata of the soft and hard interbedded strata experienced five periods:the formation of the transp

关 键 词：软硬互层 瓦斯运–储区 交叉融合 厚度比效应 覆岩裂隙 

分 类 号：TD712[矿业工程—矿井通风与安全]