基于FLAC3D的隧道开挖引发的山体滑坡稳定性分析及防治措施研究——以某隧道山体滑坡为例  

Case Study of Stability Analysis and Prevention Measures of Mountain Landslides Triggered by Tunnel Excavation Based on FLAC3D

作　　者：邵东桥[1] 周军旗[1] 吴正军[1] 邵东航 

机构地区：[1]甘肃省地矿局第三地质矿产勘查院,甘肃兰州730000 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [3]中国科学院大学,北京100049

出　　处：《地震工程学报》2016年第A01期150-156,共7页China Earthquake Engineering Journal

基　　金：中央财政特大型地质灾害治理项目

摘　　要：在对某隧道山体滑坡发育地质环境条件、灾害主要特征及成因分析的基础上,采用地震波勘探和钻探相结合的方法确定滑坡区地层岩性及埋深,并运用FLAC3D数值模拟对该山体滑坡进行稳定性分析,对比分析左侧隧道开挖前后山体的稳定性,揭示隧道开挖引发山体滑坡的机理及发展变化模式。计算结果表明:左侧隧道的开挖导致山体形成新的深层滑动面,山体变形破坏主要以隧道左侧深层滑动面上产生滑移和隧道右侧的塌陷下错为主,左侧隧道的开挖是滑坡形成的主要引发因素。将宏观定性分析与定量计算相结合,并结合工程实际提出了隧道山体滑坡综合防治措施。In the present study, we use a finite-difference software （FLAC 3D ） numerical simulation to analyze the stability of a landslide. Seismic reflection and drilling data are used to determine the lithology and depth of the landslide zone accurately by considering the geological conditions in the study area and the main characteristics and formation mechanism of a tunnel hill landslide. In addition, we compare the stability of the left side of the tunnel before and after its exca-vation ,thus revealing the mechanism of landslide, which was triggered by the tunnel excavation, and its development pattern. The results show that the excavation of the left side of the tunnel led to the formation of a new deep sliding surface in the hill. The deformation and hill was mainly caused by slipping on the deep sliding surface of the tunnel＇s left side and collapse on the tunnel＇s right side. Therefore, the landslide was mainly triggered by tleft side. Finally, based on the above results, we propose prevention measures for controlling the landslide.

关 键 词：山体滑坡 成因分析 稳定性 数值模拟 防治措施 

分 类 号：TU43[建筑科学—岩土工程]