隧道下穿滑坡附加荷载计算方法研究

doi:10.13722/j.cnki.jrme.2018.0637

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摘要

随着我国高速铁路在西部地区的大规模建设，隧道在线路中所占的比列越来越高，同时运营期隧道在滑坡作用下产生的病害越来越严重。然而，我国目前在滑坡地段隧道的设计中没有统一的标准可供参考，且没有完整的计算理论，因此本文以正交体系中隧道下穿滑体为研究对象，通过对工程实例中运营隧道的病害特征进行调查、归纳和总结，建立相应的工程地质模型，然后将隧道后部紧邻滑块剩余滑坡推力的竖向分力视为作用于滑带上的垂直分布荷载，采用布辛奈斯克法计算其在隧道拱部产生的附加荷载，再将水平分量当做均布荷载分布在滑面上，采用罗西提法计算其在隧道边墙产生的水平附加荷载。结合隧道的抗压强度和松动圈理论，反算出隧道在滑面下处于安全状态的最小埋深。并通过模型试验进行了验证，结果表明附加荷载的计算方法符合工程实际，能够为滑坡地段隧道的设计提供参考。

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关键词 ：隧道工程；隧道&ndash, 滑坡；病害特征；地质模型；附加荷载；松动圈

Abstract：

With the large-scale construction of high-speed railway in Western China，the proportion of tunnels in the line is getting higher and higher. At the same time，the disease caused by landslide is more and more serious during operation. However，there is no uniform standard in the design of tunnel in landslide area in China，and there is no complete calculation theory. Therefore，this paper takes the tunnel under the orthogonal system as the object of study， and through the investigation，induction and summary of the disease characteristics of the tunnel lining in the engineering example，the corresponding engineering geological model is finally established. By using the classical soil mechanics method，the vertical component of the thrust behind the slide of the tunnel is regarded as the vertical distributed load acting on the slip zone. The additional load generated by the tunnel arch is calculated by using the method of the Boussinesq J and the horizontal component is distributed on the sliding surface as the uniformly distributed load，and the Cerruti V method is used to calculate the horizontal additional load on the side wall of the tunnel. Based on the compressive strength and the Loose circle theory of tunnel，the minimum depth of tunnel under the sliding surface is calculated. Then the model test is used to verify the method and the results show that the calculation method of the additional load is in line with the engineering practice，and can provide reference for the design of the tunnel in the landslide area.

Key words： tunnelling engineering tunnel landslide disease characteristics geological model additional load loose zone

引用本文:

吴红刚1，2，3，赵金1，3，李玉瑞1，3，陈小云4. 隧道下穿滑坡附加荷载计算方法研究[J]. 岩石力学与工程学报, 2018, 37(S2): 4375-4383.
WU Honggang1，2，3，ZHAO Jin1，3，LI Yurui1，3，CHEN Xiaoyun4. Study on calculation method of additional load of tunnel under landslide. , 2018, 37(S2): 4375-4383.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.0637 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS2/4375

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