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Upper bound analysis of stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils
AbstractThe stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils, obeying the Mohr–Coulomb failure criterion, is determined by an upper bound finite element method combined with rigid translatory moving elements (UBFEM-RTME). The stability results, which are considered to be influenced by the soil internal friction angle (ϕ), ratio of the tunnel cover to the tunnel diameter (C/D), ratio of the tunnels’ center-to-center distance to the tunnel diameter (S/D), and ratio of the product of the soil unit weight and the tunnel diameter to the soil cohesion (γD/c), are presented in the form of dimensionless stability numbers (σs/c) and failure mechanisms. The results reveal that the values of stability numbers decrease continuously with increasing γD/c and increase with increasing C/D, S/D, and ϕ, except in the cases of moderate depth and close proximity. Most of the obtained failure mechanisms are constituted by two wedge-shaped areas composed of two groups of crossed slip lines and a complete rigid area. The results of this study compare reasonably well with the solutions reported in the literature.
Upper bound analysis of stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils
AbstractThe stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils, obeying the Mohr–Coulomb failure criterion, is determined by an upper bound finite element method combined with rigid translatory moving elements (UBFEM-RTME). The stability results, which are considered to be influenced by the soil internal friction angle (ϕ), ratio of the tunnel cover to the tunnel diameter (C/D), ratio of the tunnels’ center-to-center distance to the tunnel diameter (S/D), and ratio of the product of the soil unit weight and the tunnel diameter to the soil cohesion (γD/c), are presented in the form of dimensionless stability numbers (σs/c) and failure mechanisms. The results reveal that the values of stability numbers decrease continuously with increasing γD/c and increase with increasing C/D, S/D, and ϕ, except in the cases of moderate depth and close proximity. Most of the obtained failure mechanisms are constituted by two wedge-shaped areas composed of two groups of crossed slip lines and a complete rigid area. The results of this study compare reasonably well with the solutions reported in the literature.
Upper bound analysis of stability of dual circular tunnels subjected to surcharge loading in cohesive-frictional soils
Yang, Feng (author) / Zheng, Xiangcou (author) / Zhang, Jian (author) / Yang, Junsheng (author)
Tunnelling and Underground Space Technology ; 61 ; 150-160
2016-10-13
11 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2017
Stability of dual circular tunnels in cohesive-frictional soil subjected to surcharge loading
| Online Contents | 2013