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Model test for water inrush caused by karst caves filled with confined water in tunnels

  • Weimin Yang
  • Xin Yang
  • Zhongdong Fang
  • Shaoshuai ShiEmail author
  • Hao Wang
  • Lin Bu
  • Liping Li
  • Zongqing Zhou
Original Paper
  • 11 Downloads

Abstract

In this study, a water inrush model test system for high ground stresses and hypertonic tunnels is developed to examine the evolution process of karst cave water inrush events induced by tunnel construction and rainfall. A 3D fluid-solid coupling model test is performed to simulate the tunnel excavation and increasing karst cave water pressure, and the evolutionary mechanism of karst water inrush induced by tunnel construction is revealed. The results indicate that seepage occurs during the tunnel excavation, and water seepage ceases after timely support. During hydraulic loading, the experiment successively obtained the stages corresponding to the occurrence of partial dripping, water streams, support bulging, partial and complete support block falls, and water inrush. The influence of tunnel excavation on the stability of the surrounding rock of the monitoring surface increases sharply when the distance between the tunnel excavation surface and the monitoring surface is approximately 0.5–1 times the diameter of the tunnel. The research results are significant for studies examining the water inrush mechanism and the prevention of tunnel water inrush disasters.

Keywords

Tunnel engineering Karst cave Water inrush Model test 

Notes

Funding information

Much of the work presented in this paper was supported by National Natural Science Foundation of China (Grant Nos. 51879148, 51979154), Shandong Provincial Keypoint Research and Invention program (Grant No. 2019GSF111018), China Postdoctoral Science Foundation (Grant No. 2019M660937).

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  • Weimin Yang
    • 1
  • Xin Yang
    • 1
  • Zhongdong Fang
    • 1
  • Shaoshuai Shi
    • 1
    • 2
    Email author
  • Hao Wang
    • 1
  • Lin Bu
    • 1
  • Liping Li
    • 1
  • Zongqing Zhou
    • 1
  1. 1.Geotechnical and Structural Engineering Research CenterShandong UniversityJinanChina
  2. 2.China Railway Economic and Planning Research InstituteBeijingChina

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