浙江省新昌县下山村滑坡地质特征与稳定性评价

本文研究了浙江省新昌县下山村滑坡区地质环境条件，介绍了滑坡地质灾害体的地质结构、形成特征。认为该区地质环境复杂，雨量充沛，地形呈阶梯状；岩层以5个旋回的软硬相间为主，覆盖层为第四纪松散层；滑坡体赋存松散岩类孔隙水和基岩孔隙-裂隙水，滑坡区岩土体遇水后工程地质性质变差，其抗滑、抗软化能力较差。滑坡表现为后缘切层、中-前缘顺层型。文章从滑坡成因类型的形成条件、变形破坏机制和诱发滑坡体失稳的主要因素方面，对滑坡的稳定性作出了基本评价，对其发展变化作出了趋势性预测。认为该滑坡体物质结构复杂，分7（大）层，滑坡有多个滑移带，主滑移面（带）2个，滑坡体厚达60m，降雨是诱发滑坡体失稳的主要原因，该滑坡目前仍以蠕滑为主。

The geological characteristics and stability analysis of the Xiashan Village landslide in Xinchang County,Zhejiang Province

This paper studies the regional geological environment and conditions of the Xiashan Village landslide,presents geological structure and formative characteristics on the geological disasters of landslide which are in the complex regional geological conditions,abundant rainfall and a ladder-like terrain.The rocks of landslide are among the five cycles of hard rock and soft rock up which is the cover with the Quaternary layer of loose.The loose rock pore water and rock porosity-fissure water host within the landslide.When the body of the rock and soil within the landslide areas encounter water,the engineering geological nature of them easily deteriorate,and the anti-slide and anti-softening are less capable.The latter of the landslide acts as the type of cutting stratification of rock,and the middle-front of it acts as the type of being consistent with stratification of rock.Basic evaluation of the landslide stability is made after the analysis of(1) the forming cause of conditions from different types of landslides,(2) the characteristics of landslide deformation and destruction mechanisms,(3) the main factors that cause the landslide instability.Rain-induced instability is the main factor leading to landslide which is mainly presented as creep landslide.