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A substructure method for underground structure-dry soil-saturated soil–bedrock interaction under obliquely incident earthquake and its application to groundwater effect on tunnel
Highlights A substructure method for seismic multi-media interaction is developed. An on-surface condition is proposed to provide the stiffness of truncated media. Effect of changing groundwater level on seismic response of tunnel is evaluated.
Abstract This study presents a substructure method with good accuracy and excellent efficiency for seismic underground structure-dry soil-saturated soil–bedrock interaction problem under obliquely incident earthquake. A combined zigzag-paraxial on-surface condition attached on structural surface is proposed to provide the dynamic stiffness of structural surrounding media including dry soil, saturated soil and underlying half space bedrock. The on-surface boundary condition can be implemented to any desired degree of accuracy and is compatible with numerical method such as the finite element method and the finite difference method. The condition is then coupled with structural finite element scheme and seismic wave input method to establish a substructure method. The reliability and accuracy of the proposed substructure method are verified by applying it in two degenerated interaction problems and comparing with other solutions. Finally, the proposed substructure method is employed to establish a lined tunnel-dry soil-saturated soil–bedrock interaction model for evaluating the seismic response of a lined tunnel embedded in the layered half space rich in groundwater, with an emphasis on the effects of changing groundwater levels on seismic response of tunnel lining.
A substructure method for underground structure-dry soil-saturated soil–bedrock interaction under obliquely incident earthquake and its application to groundwater effect on tunnel
Highlights A substructure method for seismic multi-media interaction is developed. An on-surface condition is proposed to provide the stiffness of truncated media. Effect of changing groundwater level on seismic response of tunnel is evaluated.
Abstract This study presents a substructure method with good accuracy and excellent efficiency for seismic underground structure-dry soil-saturated soil–bedrock interaction problem under obliquely incident earthquake. A combined zigzag-paraxial on-surface condition attached on structural surface is proposed to provide the dynamic stiffness of structural surrounding media including dry soil, saturated soil and underlying half space bedrock. The on-surface boundary condition can be implemented to any desired degree of accuracy and is compatible with numerical method such as the finite element method and the finite difference method. The condition is then coupled with structural finite element scheme and seismic wave input method to establish a substructure method. The reliability and accuracy of the proposed substructure method are verified by applying it in two degenerated interaction problems and comparing with other solutions. Finally, the proposed substructure method is employed to establish a lined tunnel-dry soil-saturated soil–bedrock interaction model for evaluating the seismic response of a lined tunnel embedded in the layered half space rich in groundwater, with an emphasis on the effects of changing groundwater levels on seismic response of tunnel lining.
A substructure method for underground structure-dry soil-saturated soil–bedrock interaction under obliquely incident earthquake and its application to groundwater effect on tunnel
Zhang, Guoliang (author) / Zhao, Mi (author) / Huang, Jingqi (author) / Du, Xiuli (author) / Zhao, Xu (author)
2021-01-26
Article (Journal)
Electronic Resource
English
Scattering of obliquely incident fast longitudinal waves around a cylinder in saturated soil
| British Library Online Contents | 2010