【作者】 李清艳； 蔡朝鹏； 彭铭； 石振明； 卢志堂； 文海家； 沈丹祎；

【Author】 LI Qingyan;CAI Zhaopeng;PENG Ming;SHI Zhenming;LU Zhitang;WEN Haijia;SHEN Danyi;Department of Geotechnical Engineering,Tongji University;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University;China Aviation International Construction and Investment Co.,Ltd.;School of Resources and Environmental Engineering,Hefei University of Technology;School of Civil Engineering,Chongqing University;

【机构】 同济大学土木工程学院地下建筑与工程系； 同济大学岩土及地下工程教育部重点实验室； 中国航空国际建设投资有限公司； 合肥工业大学资源与环境工程学院； 重庆大学土木工程学院；

【摘要】 岩质边坡发生滑动不仅与其坡体结构、构造发育有关,还与外界动力因素相关。2014年云南鲁甸发生的M_S6.5地震造成多处大型滑坡及特大型滑坡,而同年云南景谷M_S6.6地震中却只造成了中小型滑坡。为了查明鲁甸地震造成大型滑坡的主要原因,本文以2014年鲁甸地震诱发的红石岩特大型滑坡为例,利用颗粒流PFC^2D离散元软件对其进行数值分析,采用软硬两种平行黏结模型解决拉压比失真的问题,分析层理、坡顶卸荷裂隙、潜在滑动面、坡体风化裂隙、地震等各因素作用下的滑坡成因和破坏模式。根据正交试验结果和坡体裂纹发展情况,探讨了地震诱发红石岩滑坡的破坏模式以及影响红石岩滑坡规模的主要因素。结果表明,在地震作用下,红石岩发生特大规模滑坡的原因为深部滑动面的形成;而深部滑动面的形成主要来源于自身由上而下的‘硬-软-硬’结构的影响;红石岩特大型滑坡的失稳破坏模式可以概括为:中部软岩和边坡浅表破坏-硬岩悬空-剪切带的形成-大规模崩滑-堆积。本文的研究对地震诱发含软弱夹层反倾岩质滑坡灾害的预防、评估及治理有着一定的理论和工程指导意义。更多还原

【Abstract】 The occurrence of sliding on rocky slopes is not only related to their slope structure and tectonic development,but also to external dynamic factors.The M_S6.5 earthquake in Ludian,Yunnan Province in 2014 caused many large landslides and extra-large landslides.But,the Yunnan Jinggu M_S6.6 earthquake that occurred in the same year only caused only small and medium-sized landslides.In order to identify the main causes of extralarge caused by the Ludian earthquake,this paper takes the Red Rock extra-large landslide induced by the Ludian earthquake as an example.The particle flow PFC2 D discrete element software was used to analyzing it,solves the problem of distortion of the tension-compression ratio by used two parallel cohesive models,soft and hard,and its cause and failure mode under the influence of various factors such as laminae,stress-release cracks,potential sliding surface,weathering cracks in the slope body,and earthquake are discussed.Based on the results of orthogonal tests and the development of slope cracks,the failure modes of seismically induced Red Rock landslides and the main factors affecting the scale of Red Rock landslides are discussed.The results show that the reason for the occurrence of an extra-scale landslides in Red Rock under the action of earthquake is the formation of deep sliding surface.The formation of deep sliding surface mainly comes from the influence of its own top-down ’hardsoft-hard’ structure.The failure mode of the Red Rock landslide can be summarized as:Central soft rock and slope superficial damage-Hard rock overhang-Formation of shear bands-Large-scale landslide-Accumulation.The research in this paper has certain theoretical and engineering guidance significance for the prevention,assessment and management of seismically induced landslide hazards containing softly interbedded reverse-slip rock masses.更多还原