Characteristics and Disaster Model of Inrush Medium in Shizishan Tunnel

LI Yong; HAO Jun-suo; LIU Jun-feng; ZHAO Ming-fan

doi:10.11988/ckyyb.20221034

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Journal of Changjiang River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (12) : 26-32. DOI: 10.11988/ckyyb.20221034

ENGINEERING GEOLOGY SURVEY OF TUNNELS

Characteristics and Disaster Model of Inrush Medium in Shizishan Tunnel

LI Yong¹, HAO Jun-suo¹, LIU Jun-feng¹, ZHAO Ming-fan²

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Abstract

The aim of this study is to understand the structural characteristics of unfavorable geological bodies and the mechanism of mud and water inrush in the syncline structure of basalt strata. We investigated into the evolution of water and mud inrush, the disaster-causing geological structure, the basic characteristics of disaster-causing medium, the disaster-causing power and the disaster-inducing mechanism at the core of Wulongba syncline structure in Shizishan tunnel of Central Yunnan Water Diversion Project as a case study. Results demonstrated that the water inrush is resulted from the disintegration, softening and argillization of lower tuff cracks caused by the water storage structure in joint fissure dense zone of the upper syncline structure; 2) the diluted debris flow like water inrush medium carries huge energy while bursting instantaneously; 3) the water and mud inrush disaster is caused jointly by tunnel unloading collapse, groundwater action and stress release. The research finding is of guiding significance for mud and water inrush prevention for tunnels crossing fold structure.

Key words

diversion tunnel / water and mud inrush / disaster causing medium / groundwater / disaster-causing model

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LI Yong, HAO Jun-suo, LIU Jun-feng, ZHAO Ming-fan. Characteristics and Disaster Model of Inrush Medium in Shizishan Tunnel[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(12): 26-32 https://doi.org/10.11988/ckyyb.20221034

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