沟谷黄土隧道洞口深路堑边仰坡失稳分析与处治技术

Instability Analysis and Treatment Technology of Deep Cutting Slope at Gully Loess Tunnel Portal

在满足隧道结构和绿化设计要求的前提下,解决隧道洞口段黄土深路堑边仰坡失稳问题,是确保隧道结构安全、准时竣工的关键因素。以固西公路炸山嘴隧道为例,对不同工况、部位等发生的边仰坡失稳情况开展了理论研究,分析了边仰坡失稳原因、进行了边坡优化设计研究和边仰坡失稳病害处理技术研究。结果表明:边仰坡失稳与地形地貌、地应力、黄土特性、地质构造、地下水以及坡型设计、施工扰动和自然条件等多方面因素相关;优化设计后的边仰坡保证了隧道工程的安全、可靠、经济和顺利的完成。

Based on meeting the requirement of tunnel structural design and greening design,solving instability problem of deep cutting slope at tunnel portal in gully and loess was the key factors to ensure the structural safe and timely completion.This article took Zhashanzui Tunnel in Guxi Highway for example,made the theoretical study on the slope＇s instability of different conditions and sites,analyzed the cause of the slope＇s instability,and studied the optimal design and instability disease treatment technology of the slope. The result showed that the slope＇s instability was related to many factors,such as topography and landform,ground stress,loess geography,geological structure,groundwater,slope design,construction disturbance and natural conditions,and the slope after optimizing design ensured the tunnel to be safely,reliably,economically and successfully completed.