摘要
山区高速公路在建设过程中,隧道洞口的开挖往往易造成古滑坡的复活或部分复活,并形成新的滑坡灾害。为了保证隧道进洞口施工的顺利进行,隧道洞口边坡的稳定性动态分析尤为重要。本文结合栗石沟隧道进洞口边坡工程实例,利用FLAC3D软件分别对该边坡在自然状况、坡脚开挖+坡面削坡2m以及坡脚开挖+坡面削坡2m+隧道开挖13m三种工况下的稳定性状况进行了数值模拟分析,并通过分析三种工况下的边坡稳定性系数、边坡剪应变增量变化及塑性区破坏情况,探讨了其剪应变的变化特点和塑性区破坏的规律,以验证边坡削坡卸载方案在隧道施工中的安全性和可靠性。
In the construction of highway project in mountainous area,the excavation process of tunnel of- ten causes the slope failure and forms new landslide disasters. To ensure the construction of tunnel portals and the stability of slopes, it is very important to analyze the dynamic stability of tunnel portal slope. Based on the portal slope engineering of Lishigou Tunnel,this paper adopts FLAC30 to simulate the stability situ ation of the slope in three cases： in the natural condition, in the condition of toe excavation and 2 m deep cutting,and in the condition of toe excavation and 2m deep cutting with tunnel excavation 13m. Through analyzing the slope stability coefficients, shear strains and the variations of plastic zones in the three cases, the paper explores the characteristics of shear strains and the failure laws of plastic zones so as to deter- mine the safety and reliability of the slope unloading plan in the construction.
出处
《安全与环境工程》
CAS
北大核心
2013年第5期108-112,共5页
Safety and Environmental Engineering
基金
湖北省交通运输厅科技项目(2011B14)
关键词
隧道
边坡稳定性
强度折减法
削坡卸载
三维动态数值模拟
FLAC3D
tunnel
slope stability
strength reduction method
cutting slope to unload
three-dimensionaldynamic numerical simulation
FLAC3D
