顺层采动边坡滑动面形成机制与演化模式研究  

Formation mechanism and evolution model of sliding surface on the bedding rock mining slope

作　　者：丁鑫品[1,2,3] 李凤明 李宏艳[3] 刘博文 DING Xinpin;LI Fengming;LI Hongyan;LIU Bowen(China Coal Research Institute,Beijing 100013,China;CCTEG Beijing Research Institute of Land Renovation and Ecological Restoration Technology Co Ltd,Beijing 100013,China;China Coal Technology&Engineering Group,Beijing 100013,China;School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团北京土地整治与生态修复科技研究院有限公司,北京100013 [3]煤炭科学技术研究院有限公司,北京100013 [4]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《采矿与安全工程学报》2020年第5期1019-1026,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51774184);中国煤炭科工集团有限公司科技创新创业资金青年项目(2018-TD-QN005);中国煤炭科工集团有限公司科技创新创业资金专项重点项目(2019-ZD004)。

摘　　要：为了保证露天矿边帮压煤的最大限度安全开采,以典型顺层采动边坡为例,采用模型实验、数值分析和室内测试相结合的方法研究了端帮煤开采边坡变形破坏过程和滑动面岩土体性质演化规律。基于滑动面形成机制与发育特征,结合边坡变形破坏累计位移曲线将滑动面形成演化过程划分为3个阶段:水平应力传递及剪应力积聚阶段(原生弱层)、滑裂面形成及发生小变形阶段(层间剪切带)、发生大变形或最终失稳阶段(滑裂面),通过对各阶段滑动面岩土体性质进行测试分析发现,从原生弱层到层间剪切带发展过程中,滑动面岩土体结构变坏、性质变差,从层间剪切带到滑裂面发展过程中,滑动面岩土体反而强度再生、性质转好,在此基础上归纳得出顺层采动边坡滑动面形成演化模式。In order to ensure the maximum safe mining of the coal under side slopes of open-pit coal mine, with the typical mining slope as an example, the deformation and failure process of coal mining slope and the evolution law of rock and soil properties of sliding surface has been studied through model experiment, numerical analysis and laboratory tests in this paper. Based on the formation mechanism and developmental characteristics of sliding surface, and combined with the cumulative displacement curve of the deformation of the bedding rock slope, the formation and evolution process of sliding surface on the bedding rock mining slope is divided into three stages: horizontal stress transfer and shear stress accumulation stage(in the primary weak layer), formation of sliding crack surface and small deformation stage(in the interlayer shear zone), and large deformation stage or final instability stage(in the slide plane). Through testing and analyzing the properties of the rock and soil mass at each stage of sliding surface, it is found that in the process of evolution of sliding surface from primary weak layer to interlayer shear zone, the structure of sliding surface rock deteriorates and property of the soil becomes worse, and in the process of evolution from interlayer shear zone to slide plane, on the contrary, the strength of the sliding surface rock regenerates and property of the soil becomes better. And on this basis, the formation-evolution model of sliding surface on the bedding rock mining slope is concluded.

关 键 词：露天开采 顺层边坡 采动影响 滑动面 形成演化 

分 类 号：TD353[矿业工程—矿井建设]