Collapse mechanism of tunnel portal sectionin broken flysch under influence of heavy rainfall

被引：0
|
作者：
Gao Y. [1 ,2 ]
Sun H. [1 ]
Liu D. [3 ]
Xu F. [1 ]
Zhang Q. [1 ]
机构：
[1] Key Laboratory of Structural Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang
[2] Hebei Province Key Laboratory of Structural Health Monitoring and Control, Shijiazhuang Tiedao University, Shijiazhuang
[3] School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 09期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Discrete element; Energy; Fluid-solid coupling; Roofing; Seepage;
D O I：
10.11817/j.issn.1672-7207.2019.09.026
中图分类号：
P426.6 [降水];
学科分类号：
摘要：
Aimed at the accident of Kosman tunnel roof under heavy rainfall, the dynamic change law of surrounding rock fracture and seepage flow under heavy rainfall was analyzed on the basis of real-time monitoring and discrete element numerical simulation. At the same time, the failure of surrounding rock was studied by means of energy, and the transformation process of mechanical energy and elastic energy of surrounding rock was analyzed. The stability of different areas of surrounding rock was verified from the energy. The results show that the self-bearing capacity of surrounding rock is good at the initial stage of tunneling. During the rainfall process, as the seepage of the rock joints at the top of the tunnel gradually increases, the stiffness and strength of the rock joints gradually decrease, and a large number of shear failure cracks appear from the surface to the disturbance zone of the arched surrounding rock, and the number and length decrease with the increase of the buried depth. The seepage channel formed by the transfixion fracture leads the rain water into the hole from the vault. The pore water pressure and seepage field around the hole show a funnel-shaped pattern and gradually reduces. © 2019, Central South University Press. All right reserved.
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页码：2295 / 2303
页数：8
相关论文
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