强震后软岩隧道变形与破坏机制分析

发布时间：2018-06-22 04:19

本文选题：强震区 + 软岩隧道　；参考：《地下空间与工程学报》2017年03期

【摘要】：强震后软岩隧道的变形和破坏特征与一般隧道不同。根据"5.12"强震区唐家山隧道围岩变形与应力监测数据,对震后软岩隧道变形与破坏机制进行了分析。研究表明:(1)震区软岩隧道变形空间分布不对称,水平收敛是拱顶沉降的2~4倍,这是震后软岩的扩容性质和隧道所处的垂直方向高地应力环境所共同决定的;(2)隧道变形的空间效应约束范围为2~3D,在开挖面约束范围内,变形是空间效应和时效应的耦合;(3)隧道不同部位的围岩变形与破坏方式与围压性质密切相关,边墙处围岩在"形变压力"作用下易发生松弛大变形;拱部一定范围内的岩体存在整体下沉现象,拱部围岩易被架空而形成"松散压力"并诱发位移突变和破坏。研究对同类工程具有一定参考价值。
[Abstract]:The deformation and failure characteristics of soft rock tunnel after strong earthquake are different from those of normal tunnel. Based on the monitoring data of surrounding rock deformation and stress of Tangjiashan Tunnel in "5.12" strong earthquake area, the deformation and failure mechanism of soft rock tunnel after earthquake is analyzed. The results show that: (1) the spatial distribution of deformation of soft rock tunnel in seismic area is asymmetrical, and the horizontal convergence is 2 ~ 4 times of that of dome settlement. This is determined by the dilatancy of soft rock after the earthquake and the vertical high geostress environment in which the tunnel is located. (2) the spatial effect constraint range of tunnel deformation is 2? 3D, which is within the excavating surface constraint range. Deformation is the coupling of space effect and time effect. (3) the deformation and failure mode of surrounding rock in different parts of tunnel are closely related to the properties of confining pressure, and the surrounding rock at the side wall is prone to loose and large deformation under the action of "deformation pressure". The rock mass in a certain range of arch has the phenomenon of whole subsidence, and the surrounding rock of arch is easy to be elevated to form "loose pressure" and induce displacement mutation and destruction. The research has certain reference value to the similar project.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;西南交通大学土木工程学院;
【基金】：中央高校基本科研业务费专项资金(SWJTU11ZT33) 教育部创新团队发展计划(IRT0955)
【分类号】：U451

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