沪昆客运专线路堑缓倾顺层滑坡分析-《高速铁路技术》

文章信息/Info

Title:: Analysis of Gently Inclined Consequent Landslide of Cutting in Shanghai-Kunming High-speed Railway

Author(s):: CAI Jiapeng; YU Hongping; HE Yulong; ZHANG Jianwen; 1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China;
2. Southwest Jiaotong University, Chengdu 610031, China

Keywords:: Shanghai-Kunming High-speed Railway|gently inclined consequent landslide|heavy rainfall|cause analysis

摘要:: 本文根据沪昆客运专线D1K 970+460~D1K 970+675段路堑顺层滑坡的地质背景和形成过程，深入分析滑坡滑动破坏机理及主要影响因素，综合评价滑坡稳定性，并提出工程处置措施。研究表明：（1）在碳酸盐岩地区缓倾顺层地段，岩溶溶槽、溶隙发育，岩体呈硬夹弱或软硬岩互层时，降雨后溶槽、溶隙充水产生静水压力，雨水下渗沿相对隔水的软弱夹层富集并向边坡低处渗流，软化软弱夹层，导致边坡临空后顺软弱夹层产生顺层滑坡，属顺层滑移-压致拉裂型破坏；（2）综合评价滑坡稳定性，采用卸载、锚固桩、锚索桩等措施对滑坡及后壁顺层进行综合治理，治理效果良好。本文可为类似顺层工点的预防、滑坡治理提供指导及参考。

Abstract:: Based on the geological background and formation process of the consequent landslide of cutting in section D1K 970+460~D1K 970+675 of Shanghai-Kunming High-speed Railway, this paper deeply analyzed the failure mechanism and main influencing factors of landslide sliding, comprehensively evaluated the stability of landslide, and put forward the corresponding engineering measures.Conclusions:(1) There are karst troughs and solution cracks developed in the gently inclined bedding section of the carbonate rock area. Where there is rock mass with interbedding of weak or soft rock and hard rock, hydrostatic pressure is generated by filling the karst troughs and solution cracks after rainfall, and the rainwater seeps down along the weak intercalated layer which is relatively waterproof, and into the lower part of the slope, where it will soften the weak intercalated layer, resulting in bedding landslide along the weak intercalated layer after the slope is free, which is recognized as bedding slip-pressure-induced cracking failure. (2) After comprehensive evaluation of the stability of landslide, unloading, anchoring piles and anchor piles were used in a comprehensive manner to treat the landslide and back wall bedding, which proves a good effect. This practice can provide guidance and reference for the prevention and landslide control of similar bedding construction sites.