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Geomechanics and Engineering
  Volume 13, Number 6, December 2017, pages 1011-1025
DOI: http://dx.doi.org/10.12989/gae.2017.13.6.1011
 


Numerical analysis and fluid-solid coupling model test of filling-type fracture water inrush and mud gush
Li-Ping Li, Di-Yang Chen, Shu-Cai Li, Shao-Shuai Shi, Ming-Guang Zhang and Hong-Liang Liu

 
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.
 
Key Words
    filling-type fracture; water inrush and mud gush; model test; numerical modeling; evolution law.complex terrain
 
Address
Li-Ping Li: 1.) Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
2.) State Key Lab of Subtropical Building Science, South China University of Technology, Guangzhou, China

Di-Yang Chen: 1.) Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China
2.) Research Institute of New material and intelligent equipment , Shandong University, Dezhou, China

Shu-Cai Li, Shao-Shuai Shi and Hong-Liang Liu: Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, China

Ming-Guang Zhang: College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, China
 

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