Dynamic Response Analysis for a Highway-Railway Double-duty Tunnel Using Parallel Computing
ZHANG Wei-wei1,2; JIN Xian-long1,2; CAO Lu-fen2; WANG Jian-wei2; WANG Xin2
1. State Key Laboratory of Mechanical System and Vibration,Shanghai 200240 China;
2. College of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240 China
Abstract:Multi-purpose Tunnels with complex structure are being widely used nowadays. A train-tunnel-soil coupled three-dimensional finite element model was established using LS-DYNA, in order to analysis the responses of tunnel structures to the variety of loads. The problem of solving large-scale nonlinear finite element model was overcome using the contact load balancing parallel computing algorithm. The results indicate that the dynamic relaxation method is a fine approach to preload the static stress field; contact between the soil and tunnel is more accurately calculated in the simulation with the static stress field, and the stress distribution patterns are different; the effects of train and highway loads are more significant than the railway unevenness; the vertical displacement of tunnel caused by highway quasi-static load is about 1.15mm, thus vertical displacement caused by the train dynamic load fluctuates about 0.8mm; the contact load balancing parallel computing algorithm improves the computational efficiency about 15%, while the CPU number should be decided by synthetic consideration the model size and spatial topology of the model.