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Stability analysis of a deep buried elliptical tunnel in cohesive–frictional (c–ϕ) soils with a nonassociated flow rule
The stabilities and associated collapse mechanisms of deep buried unlined elliptical tunnels in cohesive–frictional (c– ϕ ) soils with the action of soil weight are investigated by the “upper-bound finite element method with rigid translatory moving elements” (UBFEM–RTME). The soil masses are assumed to obey the Mohr–Coulomb yield criterion and a nonassociated flow rule. Upper-bound stability coefficients (γ cr D/c, where γ cr is critical unit weight; D is tunnel height; c is cohesion) are deduced for different values of friction angles ( ϕ ), dilatancy coefficients (ψ/ ϕ , where ψ is dilation angle), and dimensionless spans (B/D, where B is span). The obtained collapse mechanisms do not extend to the ground surface and are primarily composed of a series of mutually movable rigid blocks. The γ cr D/c values increase while the collapse zones decrease with an increasing ϕ and ψ/ ϕ and a decreasing B/D.
Stability analysis of a deep buried elliptical tunnel in cohesive–frictional (c–ϕ) soils with a nonassociated flow rule
The stabilities and associated collapse mechanisms of deep buried unlined elliptical tunnels in cohesive–frictional (c– ϕ ) soils with the action of soil weight are investigated by the “upper-bound finite element method with rigid translatory moving elements” (UBFEM–RTME). The soil masses are assumed to obey the Mohr–Coulomb yield criterion and a nonassociated flow rule. Upper-bound stability coefficients (γ cr D/c, where γ cr is critical unit weight; D is tunnel height; c is cohesion) are deduced for different values of friction angles ( ϕ ), dilatancy coefficients (ψ/ ϕ , where ψ is dilation angle), and dimensionless spans (B/D, where B is span). The obtained collapse mechanisms do not extend to the ground surface and are primarily composed of a series of mutually movable rigid blocks. The γ cr D/c values increase while the collapse zones decrease with an increasing ϕ and ψ/ ϕ and a decreasing B/D.
Stability analysis of a deep buried elliptical tunnel in cohesive–frictional (c–ϕ) soils with a nonassociated flow rule
Yang, Junsheng (author) / Zheng, Xiangcou / Yang, Feng / Sun, Xinlei
2017
Article (Journal)
English
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