Study on Face stability analysis of the aeolian sand tunnel

2018 International Conference on Civil, Architecture and Disaster Prevention

土木建筑工程

Wang, Guangke^1

First Construction Division Co. Ltd. of China Railway Tunnel Group, Chongqing

401123, China^1

关键词: Aeolian sand tunnels;    Dynamic construction;    Engineering practices;    Geological environment;    Macroscopic and microscopic;    Mechanical response;    Three-dimensional Discrete Element Methods;    Tunnel excavation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/218/1/012126/pdf
DOI  :  10.1088/1755-1315/218/1/012126

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In view of the particularity of the geological environment of the surrounding rock of the aeolian sand, the tunnel will be destabilized due to its poor self-stability during tunnel excavation, which is worthy of attention. In this paper, the three-dimensional discrete element method is used to establish the discrete element numerical model of the excavation surface of the aeolian sand tunnel. The macroscopic mechanical response of the face is obtained and analysed, and the process of instability of the excavation surface is revealed from the macroscopic and microscopic mechanics. Based on this, the reasonable and safe support force of the excavation face is determined. Compared with the existing research, this paper uses the discrete element method to influence the dynamic construction of aeolian sand stratum on the stability of the face, which is closer to the engineering practice. The research results can provide reference for ensuring the stability of the tunnel face in the aeolian sand stratum.