供水工程新近系红层区斜坡深层变形破坏模式分析

Analysis of deep deformation and failure modes of slopesin Neogene red layer area of water supply engineering

针对新近系红层区斜坡变形破坏模式认识不足的问题,通过对以往工程区斜坡破坏现象的调查分析,寻找已有深层破坏形成的滑坡体,反分析滑坡体破坏前原始斜坡地质结构模型,并建立典型斜坡深层破坏模式,根据变形体主要工程地质条件,建立红层斜坡变形体的三维数值模型,分析其在天然、地震及降雨等条件下的稳定性。结果表明,通过建立的新近系地层不同岩段区斜坡深层破坏模式,识别出新近系地层区供水工程20#支线沿线有一个大型深层破坏斜坡变形体。该斜坡变形体在降雨条件下的稳定性较差。

This paper aims to address the lack of understanding on the deformation and failure modes of slopes in Neogene red layer area.The study involves investigating and analyzing previous slope failure phenomena in coverage areas to identify the landslide bodies formed by deep layer failure,analyzing the original geological structure model of the slope before failure,and establishing a typical deep slope failure mode,based on the main engineering geological conditions of the deformation body,developinga three-dimensional numerical model of the red layer slope deformation body to analyze its stability under the conditions of normal phenomenon,earthquakes and rainfall.The results show that based on the deep failure modes of slopes established newly in different rock sections of Neogene strata,a large deep failure slope deformation body is identified along the 20#branch line of the water supply project in Neogene strata.The numerical simulation results show that there is worse stability of slope deformation body under rainfall conditions.