滑坡影响区隧道应急支护结构可拆除性监测分析

Monitoring and Analysis on the Detachabil-ity of Tunnel Emergency Support Structure in Landslide Affected Area

针对隧道穿越滑坡影响区的现象,以某高速公路某座隧道为例进行技术探讨,介绍了隧道工程概况及滑坡区域基本工程地质条件。以隧道结构力学性状分析、监测与控制为基本思路,布置针对临时应急斜支撑的监测措施。综合使用工程地质因素定性分析法与警戒界限法进行监测成果分析,研究引起斜支撑应力波动的影响因素,分析评价了温度对临时斜支撑应力的影响程度,减小甚至规避了监测数据表面缺陷,并针对临时斜支撑拆除的可行性提出了合理化建议。从施工期应急整治完成至今,该隧道已安全运营5年,实践证明,对临时应急支护结构进行力学监测是必要的,对监测成果数据深层次分析是科学的,值得类似工程借鉴。

In view of the phenomenon of tunnel passing through the affected area of landslide, this paper takes a tunnel of a certain expressway as an example to discuss the technology, introduces the general situation of tunnel engineering and the basic engineering geological conditions of the landslide area. Based on the analysis, monitoring and control of mechanical properties of tunnel structure, the monitoring measures for temporary emergency inclined support are arranged. The qualitative analysis method of engineering geological factors and warning limit method are used to analyze the monitoring results, study the influencing factors that cause the stress fluctu-ation of inclined support, analyze and evaluate the influence degree of temperature on the stress of temporary inclined support, reduce or even avoid the surface defects of monitoring data, and put forward reasonable suggestions for the feasibility of temporary inclined support removal. Since the completion of emergency treatment in the construction period, the tunnel has been in safe operation for 5 years. It has been proved that it is necessary to carry out mechanical moni-toring on the temporary emergency support structure, and the in-depth analysis of monitoring results and data is scientific, which is worthy of reference for similar projects.