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《Sichuan Building Science》 2013-05
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The seismic response analysis of power tunnel under soft soil subjected to bidirectional earthquake

LIU Feiyu;YANG Chunhua;ZHANG Bin;Department of Civil Engineering,Shanghai University;Shanghai Municipal Electric Power Company;  
In order to study the seismic response of power tunnel shallow buried in soft soil subjected to the horizontal and vertical earthquake,the large-scale geotechnical software FLAC3D was adopted for the numerical calculation.A three-dimensional model was established,and the ground water table is 1 m underground.The speed,acceleration and displacement of typical points of typical sections are monitored in the entire process of earthquake.Responses of buried power tunnel were calculated under bidirectional earthquake.The results shows that under Shanghai artificial seismic wave,the residual horizontal displacement of the tunnel is 62.7mm,and vertical displacement is 7 mm,and the permanent deformation of the tunnel is 63 mm.The relative horizontal displacement of the roof and bottom of the tunnel is 52.1 mm,but the relative vertical displacement of the roof and the bottom is nearly 0.The residual horizontal and vertical displacement of ground are 16.4 mm and 7 mm.The whole shear stress increases with the input of dynamic loads,while the principal stresses decrease with the input of dynamic loads.The natural frequency of tunnel is 6 Hz.In conclusion the probability of shear failure is large,and the probability of tensile and resonance of tunnel failure is small.
【Fund】: 国家自然科学基金资助项目(50808119);; 上海市电力公司科技项目
【CateGory Index】: U451
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