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Metro Operation-Induced Dynamic Response of Foundation Soil for Different Degrees of Consolidation
(1 The Architectural Design and Research Institute of Zhejiang University Co. Ltd., Hangzhou 310000; 2 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 3 Zhejiang Natural Gas Exploration Co. Ltd., Hangzhou 310058)
Abstract During metro operation, soil disturbance occurs due to interaction of the train load and the track system. A vertical vibration model of the train load is established, and the law of load varying with time at the tunnel invert is calculated. The vibration response of the foundation soil to a train running on the Hangzhou Metro line 1 under construction effect is analyzed using three-dimensional FEM. The results show that: 1) ground surface vibration lags and vibration strength decreases gradually with an increase of distance between the surface soil mass and the tunnel central line; 2) on the tunnel′s longitudinal axis, the vibration laws of foundation soils above and below the tunnel have certain differences; and 3) the smaller the initial consolidation degree, the larger the ground surface vibration response, while the soil mass underneath the tunnel is affected slightly by construction disturbance. It is significant to consider the effects of metro construction disturbance in order to rationally analyze environmental vibrations during metro operation.
Abstract：
During metro operation, soil disturbance occurs due to interaction of the train load and the track system. A vertical vibration model of the train load is established, and the law of load varying with time at the tunnel invert is calculated. The vibration response of the foundation soil to a train running on the Hangzhou Metro line 1 under construction effect is analyzed using three-dimensional FEM. The results show that: 1) ground surface vibration lags and vibration strength decreases gradually with an increase of distance between the surface soil mass and the tunnel central line; 2) on the tunnel′s longitudinal axis, the vibration laws of foundation soils above and below the tunnel have certain differences; and 3) the smaller the initial consolidation degree, the larger the ground surface vibration response, while the soil mass underneath the tunnel is affected slightly by construction disturbance. It is significant to consider the effects of metro construction disturbance in order to rationally analyze environmental vibrations during metro operation.
.Metro Operation-Induced Dynamic Response of Foundation Soil for Different Degrees of Consolidation[J] MODERN TUNNELLING TECHNOLOGY, 2018,V55(1): 140-147
2018, Vol. 55 