Geomechanics and Engineering

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Stability evaluation for the excavation face of shield tunnel across the Yangtze River by multi-factor analysis

  • Xue, Yiguo (Geotechnical and Structural Research Center of Shandong University) ;
  • Li, Xin (Geotechnical and Structural Research Center of Shandong University) ;
  • Qiu, Daohong (Geotechnical and Structural Research Center of Shandong University) ;
  • Ma, Xinmin (Geotechnical and Structural Research Center of Shandong University) ;
  • Kong, Fanmeng (Geotechnical and Structural Research Center of Shandong University) ;
  • Qu, Chuanqi (Geotechnical and Structural Research Center of Shandong University) ;
  • Zhao, Ying (Geotechnical and Structural Research Center of Shandong University)
  • Received : 2019.07.09
  • Accepted : 2019.10.22
  • Published : 2019.10.30
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Abstract

Evaluating the stability of the excavation face of the cross-river shield tunnel with good accuracy is considered as a nonlinear and multivariable complex issue. Understanding the stability evaluation method of the shield tunnel excavation face is vital to operate and control the shield machine during shield tunneling. Considering the instability mechanism of the excavation face of the cross-river shield and the characteristics of this engineering, seven evaluation indexes of the stability of the excavation face were selected, i.e., the over-span ratio, buried depth of the tunnel, groundwater condition, soil permeability, internal friction angle, soil cohesion and advancing speed. The weight of each evaluation index was obtained by using the analytic hierarchy process and the entropy weight method. The evaluation model of the cross-river shield construction excavation face stability is established based on the idea point method. The feasibility of the evaluation model was verified by the engineering application in a cross-river shield tunnel project in China. Results obtained via the evaluation model are in good agreement with the actual construction situation. The proposed evaluation method is demonstrated as a promising and innovative method for the stability evaluation and safety construction of the cross-river shield tunnel engineerings.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Central Universities, Natural Science Foundation of Shandong Province

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