Determinant Factors of Stability and Optimization of Construction Sequence in Tunnel Group with Small Clear Distance

doi:10.11988/ckyyb.20161260

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (4) : 109-116. DOI: 10.11988/ckyyb.20161260

ROCK-SOIL ENGINEERING

Determinant Factors of Stability and Optimization of Construction Sequence in Tunnel Group with Small Clear Distance

DU De-chi¹, WANG Wei-ming¹, LIU Peng², LÜ Xian-zhou¹, ZHANG Wei-she¹

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Abstract

Maximum vault settlement, plastic zone volume, maximum shear rock stress and maximum axial force of bolt etc., are determinant factors which reflect the stability of tunnel group with small clear distance. To investigate into the correlation degree among these factors, we obtained the values of these determinant indexes by using finite difference software together with modified Drucker-Prager model. Dunhua road station of Qingdao metro is taken as engineering background. In line with fuzzy grey relational theory, the order of determinant factors and the optimum scheme of construction sequence are analyzed. Results reveal that maximum axial force of bolt can be taken as the primary determinant factor of tunnel group stability; while maximum vault settlement and plastic zone volume could also reflect the tunnel group stability significantly; maximum shear rock stress has the smallest influence on tunnel group stability. In the present study, scheme 4 and scheme 5 are concluded as the optimum construction sequences, and both are verified by equivalent stress analysis.

Key words

tunnel group with small clear distance / stability / determinant factor / fuzzy grey relational analysis / optimization selection of schemes

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DU De-chi, WANG Wei-ming, LIU Peng, LÜ Xian-zhou, ZHANG Wei-she. Determinant Factors of Stability and Optimization of Construction Sequence in Tunnel Group with Small Clear Distance[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(4): 109-116 https://doi.org/10.11988/ckyyb.20161260

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