暴雨作用下含裂缝谭家湾堆积层滑坡渗流特征与稳定性分析

堆积层滑坡在三峡库区分布广泛,该类滑坡在前期变形过程中往往产生拉张裂缝,暴雨是导致其失稳的主要诱因之一.为探究暴雨作用下裂缝优势入渗对堆积层滑坡渗流场与稳定性的影响,以谭家湾堆积层滑坡为研究对象,通过地质调查、监测数据分析以及数值模拟方法,研究了暴雨作用下含裂缝谭家湾堆积层滑坡的渗流场与稳定性演化规律.结果表明:天然条...

Seepage Characteristics and Stability of Tanjiawan Accumulation Landslide with Cracks under Rainstorm

Accumulation landslides are widely distributed in the Three Gorges Reservoir area,and the early deformation of them often produces tensile cracks.Rainstorm is one of the major factors for instability of this type of landslide.In order to reveal the influence of crack dominant infiltration on the seepage field and stability of the accumulation landslide under the action of rainstorm,this paper takes Tanjiawan accumulation landslide as the research object,and uses the geological survey,monitoring data analysis and numerical simulation method to study the evolution law of seepage field and stability of the landslide with cracks under the influence of the rainstorm.The results show that Tanjiawan landslide is stable under natural conditions,its deformation is related to the high-intensity rainfall,and the displacement curve of the landslide is characterized by a stepped pattern;when the rainstorm intensity is greater than the saturated permeability coefficient of the soil,the rainwater runoff merges into the cracks and forms the ponding,which transforms into the pressure infiltration and greatly increases the infiltration speed and amount of the rainwater;when the position where the cracks are developed is close to the groundwater level,rainwater easily recharges groundwater through cracks,increase the groundwater level,and the continuous immersion and softening of the sliding zone leads to a large and continuous decrease in stability.