摘要
近年来,在黄土地区修建的隧道工程日益增多,受工程地质条件、水文地质条件及人为因素等影响,公路隧道洞口段边坡在施工过程中易发生坍塌事故。本文结合某在建黄土隧道洞口边坡为例,首先从地质因素、施工因素以及降水作用三方面分析边坡坍塌产生的机制,然后通过隧道施工隐性滑移面的计算,进一步分析坍塌产生的原因,最后通过有限元数值计算软件模拟滑塌面形态及特征,很好地反馈了整个滑坡发生的过程。通过分析认为,湿陷性黄土层特殊的地质条件和其较差的物理力学性质是坍塌发生的内在因素,而施工扰动、降水入渗和冻融循环是坍塌发生的诱发因素。
In recent years,the construction of tunnel project in loess area is increasing, because of its engineering geologic condition,hydrogeological condition and artificial factor,it is easy to have side-slope collapse at tunnel entrance. In this paper,the construction of a loess tunnel entrance slope is taken as an example,firstly,the mechanism of side-slope collapse is analyzed in three aspects,such as geological factor,construction factor and precipitation effect. Then,the hidden slip plane of tunnel construction is calculated,further analysis on the reasons for the collapse is carried out. Finally,the process of collapse is simulated by FEM software. Through analysis,it shows that the special geological physical and poor mechanical properties of collapsed loess are the internal factors and the construction disturbance,precipitation infiltration and freeze-thaw cycles are the induced factors.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S1期307-311,共5页
Chinese Journal of Underground Space and Engineering
基金
湖南省教育厅科学研究项目(13C313)
湖南省科技厅科技计划项目(2014FJ3104)
河北省自然科学基金(D2014402007)
关键词
黄土隧道
洞口边坡
坍塌机理
数值分析
loess tunnel
side-slope of tunnel entrance
collapse mechanism
numerical analysis
