洞口上覆不稳定堆积体隧道施工稳定性分析研究
Analysis and Research on the Construction Stability of Tunnel with Unstable AccumulationOverlying the Portal
刘民军 1夏志杰 1张楚璇1
作者信息
- 1. 中国水利水电第十四工程局有限公司,云南 昆明 650041
- 折叠
摘要
针对不稳定堆积体会对边坡工程、隧道工程等岩土工程的施工造成一定程度的阻碍,以贵州凯里环城高速公路洛邦隧道洞口段不稳定堆积体为研究对象,探讨了不稳定堆积体区隧道围岩稳定性和支护结构力学响应,分析了不稳定堆积体仰坡稳定性和隧道上方既有道路沉降成因.研究表明:当隧道洞口段下穿不稳定堆积体时,需重点关注穿越滑带部位初期支护安全性;在隧道被开挖扰动的情况下,利用注浆钢花管抗滑桩支护效果较好,可使不稳定堆积体区隧道洞口仰坡的稳定性明显提高,既有道路沉降得到了有效控制.
Abstract
Unstable accumulation can cause certain obstacles to the construction of geotechnical engineering such as slope engineering and tunnel engineering.Taking the unstable accumulation at the entrance of Luobang Tunnel on Kaili Ring Expressway in Guizhou as the research object,this paper explores the stability of the surrounding rock and the mechanical response of the support structure in the unstable accumulation body area of the tunnel.The stability of the unstable accumulation body's forward slope and the causes of settlement of the existing road above the tunnel are analyzed.Research has shown that when the tunnel entrance section passes through unstable accumulations,special attention should be paid to the safety of initial support at the crossing slip zone.In the case of excavation disturbance in the tunnel,the use of grouting steel flower pipe anti slip pile support has a good effect,which can significantly improve the stability of the tunnel entrance slope in the unstable accumulation area,and effectively control the settlement of the existing road.
关键词
洞口/不稳定/堆积体/稳定性Key words
entrance/unstable/accumulation/stability引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据