Dynamic response of a tunnel buried in a saturated poroelastic soil layer to a moving point load |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, PR China;2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, PR China;1. Institute of Civil Engineering and Architecture, Qingdao Binhai University, Qingdao 266555, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;3. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China;4. Department of Civil, Environmental & Architectural Engineering, University of Colorado, Boulder, CO 80302, USA;1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310027, PR China;2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, PR China;3. School of Civil Engineering, Qingdao Technological University, Qingdao 266033, PR China;1. Shandong Province Key Laboratory of Civil Engineering & Disaster Prevention and Mitigation (Institute of Civil Engineering and Architecture), Shandong University of Science and Technology, Qingdao 266590, China;2. Department of Civil and Environmental Engineering, National University of Singapore, No. 21 Lower Kent Ridge Road, 119077, Singapore;3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;4. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300354, China;2. School of Civil Engineering, Tianjin University, Tianjin 300354, China |
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| Abstract: | The dynamic response of a tunnel buried in a two-dimensional poroelastic soil layer subjected to a moving point load was investigated theoretically. The tunnel was simplified as an infinite long Euler–Bernoulli beam, which was placed parallel to the traction-free ground surface. The saturated layer was governed by Biot’s theory. Combined with the specified boundary conditions along the beam and saturated poroelastic layer, the coupled equations of the system were solved analytically in the frequency–wavenumber domain based on Fourier transform. The time domain responses were obtained by the fast inverse Fourier transform. The critical velocity of the considered structure was determined from the dispersion curves. The different dynamic characteristics of the elastic soil medium and the saturated poroelastic medium subjected to the underground moving load were investigated. It is concluded that, for coarse materials or fine materials subjected to the high-velocity loading, models ignoring the coupling effects between the pore fluid and the soil skeleton may cause errors. The shear modulus and the permeability coefficients of the saturated soil as well as the load moving velocity had significant influence on the displacement and pore pressure responses. |
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| Keywords: | Poroelastic Critical velocity Pore pressure Tunnel Moving load |
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