降雨-裂缝耦合作用下堆积体斜坡渐进破坏过程与失稳机理研究

降雨型滑坡的渐进破坏过程与失稳机理历来是地质灾害防治领域的热点和难点问题。滑坡裂缝作为斜坡变形破坏的中间产物及事实存在，在降雨型滑坡稳定性评价时却经常被忽视。降雨沿裂缝的集中入渗加速了斜坡的渐进破坏和裂缝的扩展，而扩展后的裂缝将更便于雨水入渗，进而加速斜坡变形。课题拟以镇雄赵家沟滑坡为研究对象，采用天然降雨原位监测、人工降雨模型试验和精细数值模拟相结合的方法，研究降雨-裂缝耦合作用下堆积体滑坡的渐进变形过程与失稳机理，揭示裂缝演化与变形失稳阶段间的时空关联，获取滑坡失稳前兆信息。课题研究成果可为降雨型堆积体滑坡稳定性评价和失稳预测提供依据。

The progressive failure mechanism of rainfall-induced landslide is always the hot and difficult problems in the prevention and remediation of geohazard. As the inter-medium product of the slope deformation and failure, the existence landslide cracks is always be ignored or generalized during the assessment of the rain-induced landslide. However, the rain infiltration along landslide cracks will accelerate the progressive failure of the slope and the formation of crack system. Moreover, the enlarged cracks will further facilitate the rain infiltration and in turn increase the slope deformation. Taken the Zhaojiagou Landslide as the research area, the project is planned to carry out the following researches based on the comprehensive method of the in-situ natural rainfall monitoring, physical modeling of artificial rainfall on a slope with fissures and the dedicated numerical simulations. (1) the progressive deformation process of colluvial slope under the coupling of rainfall-landslide and its instability mechanism; (2) the time-spatial correlation between the crack evolution and the stage of slope deformation and failure; (3) Obtain of the useful information related to the slope failure. The results of the project could provide valuable basis for the stability assessment of rain-induced colluvial landslides and their failure forecast.