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基于能量耗散理论的黏性土坡破坏发育机理研究 预览

Study on Development Mechanism of Cohesive Soil Slope Failure Based on Energy Dissipation Theory
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摘要 针对自重作用下黏性土坡开挖过程中滑坡失稳的渐进破坏过程,采用PFC2D颗粒流数值模拟,再现了黏性土坡从发生到发展、演化再到最终失稳破坏的整个过程。结合能量耗散结构指出自重服役下的滑坡破坏过程本质是由于能量释放驱动下的能量耗散所引起的一种状态失稳现象,能量释放和能量耗散的共同作用是引起滑坡渐进破坏的内在原因。把滑坡的整个过程划分成3个阶段,即蠕变损伤、强度丧失,裂隙发展、滑坡加速,滑体减速、滑面渐宽;并从颗粒细观尺度给出了基于能量释放的边坡强度失稳准则,进一步解释了滑坡整体破坏的本质原因。 In view of progressive failure in landslide instability of cohesive slope under the self-weight service during the excavation process, with the method of PFC2D numerical experiments, the whole process is generated from growth, development and evolution to the final slide of the cohesive slope. Combining with the energy dissipation structure, it is pointed out that the landslide failure process under self-weight service is essentially a state instability phenomenon caused by energy dissipation driven by energy release. The interaction between energy release and energy dissipation is the internal cause for progressive failure of landslide. The whole process of landslide divides into 3 stages, namely the creep damage, loss of strength, crack development, landslide acceleration, landslide deceleration, sliding surface enlarging. The strength slope instability criterion based on energy release is given from Meso-scale particles, and further the essential reason for the whole landslide damage is described.
作者 王振华 柴新军 刘夕奇 Wang Zhenhua,Chai Xinjun,Liu Xiqi(1.School of Civil Engineering and Architecture, East China Institute of Technology, Nanchang 330013,China; 2.School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China)
出处 《金属矿山》 北大核心 2018年第10期162-166,共5页 Metal Mine
关键词 黏性土坡 渐进破坏 PFC2D 能量耗散理论 强度失稳准则 Cohesive slope Progressive failure Particle flow code 2D Energy dissipation structure Strength slope instability criterion
作者简介 王振华(1984-),女,讲师,博士研究生。
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