某工程厂址古滑坡变形演化机制及稳定性研究

Research on deformation evolution mechanism and stability of a project site ancient landslide

习酒厂址所在的古滑坡堆积体具有局部陡坎的微地形,其稳定性对今后古滑坡体上密集建筑群建造施工至关重要。在阐述古滑坡基本特征的基础上,结合地质勘察以及数值模拟的方法,对习酒厂址古滑坡的变形演化机制及稳定性进行研究。古滑坡坡体失稳破坏主要分为3个阶段,随着土体抗剪强度折减会在局部不利地形处产生裂缝,然后会出现两阶段的滑动破坏,并且降雨条件会加速坡体的失稳破坏。研究结果表明,古滑坡堆积体不会发生整体性的滑坡灾害,但极易发生局部的滑塌,主要为局部的变形破坏,其出现的破坏模式可能为坡体中上部分的滑移-拉裂破坏以及中下部堆积体的蠕动-拉裂破坏。研究结果可为该古滑坡堆积体上密集建筑群建造活动的开展提供重要依据。

The Xijiu site old landslide is featured with local steep slope microtopography.Its stability is very important for the construction of dense buildings on the ancient landslide in the future.This paper first describes the essential fea⁃tures of the ancient landslide,and then combines with geological survey report and numerical simulation,and research on deformation evolution mechanism and stability of the Xijiu site ancient landslide.The deformation process of the land⁃slide is roughly divided into three stages.As the shear strength of soil decreases,cracks appear in unfavorable terrain,and then two stages of sliding failure,and the rainfall conditions will accelerate the instability of the landslide.The re⁃sults show that the landslide mainly occurs local deformation failure.The landslide is not prone to large-scale landslide disaster.The failure modes are mainly sliding failure in the middle-upper part of the landslide and creeping failure in the lower middle part of the landslide.The research results have provided important basis for the construction of dense build⁃ing groups on the ancient landslide accumulation body.