摘要
为了探究隧道斜向(20°~80°)穿越滑坡体时隧道与滑坡体在隧道开挖过程中的相互影响机制,结合隧道施工的洞口段滑坡综合治理方案可行性,依托实际工程--郴州市某隧道洞口段滑坡抢险治理工程,提出针对斜交隧道洞口段滑坡的综合治理方案。采用稳定性分析法、数值分析和数值模拟方法,分析了依托工程的工程概况及防治特点。选取滑坡主滑断面,计算分析滑坡在暴雨工况下的稳定性和下滑力。结合实际工程全过程监测数据,以及三维数值模拟计算结果云图,分析了滑坡段隧道施工中滑坡体和隧道围岩的变形监测数据。分析治理后的滑坡和隧道的稳定性,评价治理方案可行性,同时为此后类似工程提出合理建议。结果表明:(1)针对滑坡-隧道斜交时隧道洞口段滑坡治理,提出的以"工字型"抗滑桩为主体并加强隧道洞门超前管棚加固和初期支护的综合治理方案可行,监测数据显示,滑坡在隧道穿越滑体后处于稳定状态;(2)由隧道开挖前后的模拟结果可知,在隧道穿过滑体后,隧道洞身支护结构与"工字型"抗滑桩形成组合抗滑结构体,进一步提高隧道洞口段坡体稳定性;(3)通过分析隧道拱顶沉降监测数据,可知滑坡段隧道收敛明显,且愈趋近滑带,隧道沉降变形愈大。
In order to explore the interaction mechanism of tunnel and landslide during tunnel excavation when the tunnel obliquely crosses the landslide body(20°~80°),combining with the feasibility of the comprehensive treatment scheme of the landslide in the tunnel portal section under construction,based on an actual project-the landslide emergency treatment project at the exit of a tunnel in Chenzhou City,the comprehensive treatment scheme for the landslide at the portal section of the inclined tunnel is proposed. The general situation and the prevention characteristics of the supporting project are analyzed by using stability analysis,numerical analysis and numerical simulation. Selecting the main sliding section of the landslide,the stability and sliding force of the landslide under rainstorm condition are calculated and analyzed. Based on the monitoring data of the whole process of the actual project and the nephogram of 3 D numerical simulation result,the deformation monitoring data of the landslide mass and the tunnel surrounding rock are analyzed. The stability of the landslide and tunnel after treatment are analyzed,the feasibility of the treatment scheme is evaluated,and the reasonable suggestion for similar projects in the future is put forward. The result shows that(1) For the treatment of the landslide at the tunnel portal when the landslide-tunnel intersects obliquely,it is feasible to propose a comprehensive treatment scheme that taking the "I-shaped" anti slide pile as the main supporting structure,and strengthening the advance pipe shed reinforcement and initial support of the tunnel portal. The monitoring data show that the landslide is stable after the tunnel passes through the landslide mass.(2) According to the simulation result of the tunnel before and after excavation,after the tunnel passes through the landslide mass,the tunnel supporting structure and the "I-shaped" anti slide pile form a combined anti slide structure,further improving the stability of the slope at the tunnel portal.(3) By analyzing the monitoring data of tunnel vault settlement,it can be seen that the convergence is obvious in the tunnel landslide section,and the closer the sliding zone is,the larger the settlement deformation of the tunnel will be.
作者
张可能
李斌
张洪亮
戚玉禄
张云毅
ZHANG Ke-neng;LI Bin;ZHANG Hong-liang;QI Yu-lu;ZHANG Yun-yi(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of MOE,Central South University,Changsha Hunan 410083,China;School of Geosciences and Info-physics,Central South University,Changsha Hunan 410083,China;HNCEG Communications Construction Co.,Ltd.,Changsha Hunan 410004,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2020年第5期100-107,共8页
Journal of Highway and Transportation Research and Development
关键词
隧道工程
综合治理
监测
数值模拟
滑坡体
斜交体系
tunnel engineering
comprehensive treatment
monitoring
numerical simulation
landslide
inclined system
