大型滑坡长期演变的地质力学行为及成灾模式研究年度报告

苏立君++苏志满++李新坡+++岳宗玉++林锋

摘 要：该年度投入了大量的人力和物力开展文献资料总结和野外调查工作，初步将西部山区大型滑坡地质结构类型划分为“弱面”控制型、“关键块体”型、“软弱基座”型和“采空区”控制型四大类。将滑坡成灾模式划分为变形体-潜在威胁模式、滑坡-随动破坏模式、滑坡-高速碎屑流模式、滑坡-堰塞坝堵江模式和滑坡-高涌浪模式等5个模式。完成了对贵州习水县程寨滑坡、贵州关岭县岗乌镇大寨滑坡和重庆武隆鸡尾山滑坡地质结构类型及成灾模式的详细调查分析工作。获取了滑坡岩土体物性参数，为后续研究打下了基础。在滑坡的启动和运动机理研究方面，主要完成了模型试验设备的设计和加工，基于连续介质力学和离散元的滑坡动力过程模拟，针对声波液化模型在大型滑坡中的应用及滑坡模拟中物质状态方程的替代问题的研究和采用大型模型槽及离散元方法对大型滑坡产生的碎屑流运动特征的研究等工作。该年度所取得的研究成果有助于加深人们对大型滑坡地质结构类型和成灾模式的认识和理解，拓宽现有的对大型滑坡启动和运动的模拟方法，推动大型滑坡成因机理研究向前发展。

关键词：大型滑坡 地质结构 物理模型试验 数值模拟

Abstract： Large amount of man power and resourses were used to carry out literature review and site investigation， this year. The characteristics of large scale landslides in west China were preliminarily divided to four groups， which are weak interface controled， key block controled， weak foundation controled and goaf controled landslides， respectively. The disaster modes of large scale landslides were divided into five types， including deformation body-potential threats mode， landslide-follow-up damage mode， landslide-high speed dry debris folw mode， landslide-dammed lake mode and landslide-surge mode. Detail investigation and analyses were conducted on types of geological structure and disater modes of Gui zhou Xi shui landslide， Gui zhou Guan ling landslide and Chong qing Wu long Ji wei shan landslide. The physical and mechanical parameters of rock and soil mass of the landslides were obtained for future research. Facilities for physical modeling of landslides were designed and manufactured. Numerical simulation of landslides based on continuum mechanics and discrete elements were conducted. The application of Acoustic liquefaction model and principle of equation of state substitution in simulation of landslides were also carried out. Large scale flume tests of dry debris flow were simulated by discontinuous deformation analysis method. The achievement we obtained this year will enhance our knowledge and understanding of the characteristics of geological structure and disaster modes for large scale landslides， broaden numerical simulations methods for the iniation and movement of large scale landslides and push the development of research on mechanism of large scale lnadslides. One SCI paper that was supported by this project was published and four more papers were submitted to international journals.

Key Words： Large landslides； Geological structure； Physical model tests； Numerical simulation

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