Geomechanics and Engineering

Techno-Press (테크노프레스)
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Numerical analysis and fluid-solid coupling model test of filling-type fracture water inrush and mud gush

  • Li, Li-Ping (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Chen, Di-Yang (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Li, Shu-Cai (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Shi, Shao-Shuai (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Zhang, Ming-Guang (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Liu, Hong-Liang (Research Center of Geotechnical and Structural Engineering, Shandong University)
  • Received : 2016.01.11
  • Accepted : 2017.07.05
  • Published : 2017.12.25
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Abstract

The geological conditions surrounding the Jijiapo Tunnel of the Three Gorges Fanba Highway project in Hubei Province are very complex. In this paper, a 3-D physical model was carried out to study the evolution process of filling-type fracture water inrush and mud gush based on the conditions of the section located between 16.040 km and 16.042 km of the Jijiapo Tunnel. The 3-D physical model was conducted to clarify the effect of the self-weight of the groundwater level and tunnel excavation during water inrush and mud gush. The results of the displacement, stress and seepage pressure of fracture and surrounding rock in the physical model were analyzed. In the physical model the results of the model test show that the rock displacement suddenly jumped after sustainable growth, rock stress and rock seepage suddenly decreased after continuous growth before water inrushing. Once water inrush occured, internal displacement of filler increased successively from bottom up, stress and seepage pressure of filler droped successively from bottom up, which presented as water inrush and mud gush of filling-type fracture was a evolving process from bottom up. The numerical study was compared with the model test to demonstrate the effectiveness and accuracy of the results of the model test.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Natural Science Foundation of Shandong Province of China, South China University of Technology

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