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Kinematic analysis of the three-dimensional stability for tunnel faces by pseudodynamic approach
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.compgeo.2020.103802
Jun-Hao Zhong , Xiao-Li Yang

Abstract Seismic waves have significant effects on the stability of geotechnical engineering projects. However, only a small number of studies have focused on the seismic stability of tunnel faces. Using the kinematic approach of limit analysis, this paper conducts a seismic analysis to evaluate the three-dimensional stability of the tunnel face. A three dimensional rotational mechanism is introduced to describe the active collapse of a tunnel face. To overcome the shortcomings of the conventional pseudostatic method, the pseudodynamic method, which can consider the variation in acceleration with time and space, is used to characterize earthquake acceleration. The collapse body is horizontally sliced into many layers considering the acceleration changing with space, and the work rate is calculated along the horizontal plane. Based on the kinematic analysis method, the explicit equation to calculate the required supporting pressure on the tunnel face is derived. The results can be obtained using the optimization algorithm. The validity of the proposed method is proven in comparison to that of existing solutions. Parameter analysis is further performed to reveal the effects of specific parameters on the retaining force.

中文翻译:

隧道掌子面三维稳定性的拟动力法运动学分析

摘要 地震波对岩土工程项目的稳定性有显着影响。然而,只有少数研究集中在隧道掌子面的地震稳定性方面。运用极限分析的运动学方法,进行了抗震分析,评价了掌子面的三维稳定性。引入三维旋转机制来描述隧道掌子面的主动坍塌。为克服传统拟静力法的不足,采用能考虑加速度随时间和空间变化的拟动力法来表征地震加速度. ....................... ..........................................................................................................考虑加速度随空间变化,将塌陷体水平切片,沿水平面计算功率。基于运动学分析方法,推导出了计算掌子面所需支护压力的显式方程。可以使用优化算法获得结果。与现有解决方案相比,证明了所提出方法的有效性。进一步执行参数分析以揭示特定参数对保持力的影响。
更新日期:2020-12-01
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