The influence of soil stiffness anisotropy and permeability anisotropy on the long-term response of a tunnel
The influence of soil stiffness anisotropy and permeability anisotropy on the long-term response of a tunnel
The accurate simulation of the present-day deformations and internal forces of existing tunnels is essential when predicting the available capacity of such tunnels to sustain further loading from new construction in their vicinity. In this paper, the present-day condition of a single tunnel located in the London Clay formation is simulated with a series of plane-strain finite element analyses. The focus of the numerical investigation is to evaluate the impact of soil stiffness anisotropy and permeability anisotropy on the long-term tunnel response. To evaluate the former, a comparison between analyses adopting a nonlinear isotropic stiffness model and an extension of this model considering transverse isotropic stiffness is made. The influence of the permeability anisotropy is investigated parametrically with a series of analyses varying the permeability anisotropy ratio kh/kv. The numerical results demonstrate the importance of considering the two aspects of soil behaviour for the simulated tunnel response to be consistent with field observations.
Agustin Ruiz Lopez; Aikaterini Tsiampousi; Jamie R. Standing; David Malcolm Potts
10th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2023)
10. Tunnelling and mining applications
https://doi.org/10.53243/NUMGE2023-175
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