【摘要】 古滑坡是斜坡长期复杂演化的产物。随着人类工程活动的加剧及地震、强降雨的影响,古滑坡复活问题日益突出。由于碎石土古滑坡含有大量碎石与岩石碎屑,其复活失稳之后造成的危害尤其严重。以西南地区甘孜州赤绒碎石土古滑坡为研究对象,从工程地质分析的角度出发,系统研究碎石土古滑坡滑体、滑带土的物理力学性质和渗透性质,综合地形地貌、构造、地震、降雨等外部因素,对碎石土古滑坡的复活演化机理进行分析研究。研究分析结果表明:①古滑坡属于多期次复活型滑坡,按滑坡形成的先后顺序大致分为古、老、新三个阶段;②碎石土滑坡以粗大碎石形成骨架构成降雨下渗通道的渗流模式是造成复活的主要外部因素;③通过工程地质分析将碎石土古滑坡的复活演化过程归纳为"四时期-六阶段"。更多还原

【Abstract】 Ancient landslides are the product of long-term complex evolution of slopes. Due to intensification of human engineering activities and the impact of earthquakes and heavy rainfall, the problem of ancient landslides reactivation has become increasingly prominent. The damage caused by reactivation of landslide is particularly serious as the detritus soil ancient landslides contain a lot of gravel and rock debris. Taking the Chirong detritus soil ancient landslide in Garzi Prefecture in southwest China as the research object, this paper analyses the reactivation evolution mechanism of the detritus soil ancient landslide from the perspective of engineering geology. The external factors such as topography, geological structure, earthquake and rainfall etc.are systematically studied, and the physical properties and permeability of the detritus soil ancient landslide and slippery soil are analyzed. According to research and analysis, the results are concluded:① The ancient landslide belongs to the multi-period reactivation landslide, which is roughly divided into three stages: ancient, old and new according to the order of landslide formation;② The seepage pattern of detritus soil landslide that coarse gravels form skeleton and rainfall infiltration channel is the main external factor causing the reactivation of detritus soil ancient landslide;③ The reactivation evolution process of the detritus soil ancient landslide is summarized as "four-period, six-process" through engineering geological analysis.更多还原