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Geotechnical and Geological Engineering

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01-08-2022 | Original Paper

Research on the Evolution Mechanism of Water Inrush in Karst Tunnel and the Safety Thickness of Water-Resisting Rock Mass

Authors: Meixia Wang, Weimin Yang, Zongqing Zhou, Liping Li, Dunyi Deng, Qiwen Zhou

Published in: Geotechnical and Geological Engineering | Issue 9/2022

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Abstract

Water inrush due to rock mass progressive failure in karst tunnels is one of the disasters in tunnel construction. The practical measures to ensure the safety of tunnel construction are to clarify the mechanism of water inrush and reserve the safety thickness. In this paper, the geomechanical model test and numerical simulation were carried out based on the Xiema Tunnel in Chongqing, China. The results of the displacement and hydraulic pressure of the monitoring points in the physical and numerical models were analyzed. In view of the reserved safety thickness between the tunnel face and the water-filled karst cave, the orthogonal numerical simulation tests were designed considering the influence of the tunnel diameter, the cave diameter, the cave water pressure, and the surrounding rock grade. The influence laws and response sensitivity of each factor on the safety thickness were obtained. According to the numerical simulation results and the multiple linear regression method, the formula of safety thickness was derived. Finally, some measures and suggestions for preventing and controlling water inrush disasters were obtained.

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Title: Research on the Evolution Mechanism of Water Inrush in Karst Tunnel and the Safety Thickness of Water-Resisting Rock Mass
Authors: Meixia Wang
Weimin Yang
Zongqing Zhou
Liping Li
Dunyi Deng
Qiwen Zhou
Publication date: 01-08-2022
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 9/2022
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-022-02169-8

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