Analysis on Progressive Failure Process of Immersed Surrounding Rock of Large-section Loess Tunnel

Jianzhe Zhang

doi:10.54691/c59ngp24

Authors

Jianzhe Zhang

DOI:

https://doi.org/10.54691/c59ngp24

Keywords:

Surrounding Rock Immersion; Loess Tunnel; Progressive Failure Process; Large Cross-Section.

Abstract

The Baishi No.2 tunnel project of Lanzhou-Zhongwei railway as the background, the influence of rainfall and groundwater on the tunnel in Lanzhou area is discussed. The reasons for the deterioration of surrounding rock immersion in 15 tunnels at home and abroad are counted, and the reasons for the deterioration of surrounding rock immersion in loess tunnels are summarized and analyzed, and suggestions are given. The results show that the collapse of the surrounding rock of the soaking deteriorated loess is sudden, and the high incidence position is the tunnel vault, but the surrounding rock will undergo large deformation before the collapse until the surrounding rock is destroyed. After the collapse of the surrounding rock of the water-immersed deteriorated loess, multiple collapses will occur in a short period of time. These collapses do not meet the law of large deformation first and then collapse, and there are almost no signs. Therefore, the reinforcement of the water-immersed deteriorated loess should be focused on before the first collapse ; in the construction of shallow buried tunnel with soaked and deteriorated surrounding rock, the influence range affects the surface. The possible overload condition on the surface should be controlled to prevent the occurrence of surface overload from accelerating the early deformation process of surrounding rock and causing the collapse of surrounding rock.

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