Application of a time-dependent bounding surface model in metro engineering
LUO Junhui1，MIAO Linchang1，LI Renjue2，SHI Wenbo1，WANG Gang3
(1. Institute of Geotechnical Engineering of Southeast University，Nanjing，Jiangsu 210096，China；2. Changzhou Institute of Technology，Changzhou，Jiangsu 213002，China；3. Liaoning Engineering Investigation and Design Institute，
Jinzhou，Liaoning 121000，China)
Abstract：In order to simulate realistically the characteristics of low amplitude and high vibration of the moving metro loads and to calculate accurately the long-term settlement of the soft soil foundation，a dynamic constitutive model was suggested to describe the creep behavior of soft soil under low stress levels. A time-dependent bounding surface model based on the theory of bounding surface model and Mesri creep model was established. In order to write the user-defined material subroutine in ABAQUS，the proposed model was deduced using the stress integration algorithm and further optimized using the prevent strain method. The model has advantages of shortening the computation intervals，increasing the total number of iterations and ultimately making the convergence much easier. The model was validated through the comparison of the simulation results with those from the GDS dynamic triaxial tests on normally consolidated Nanjing soft soil. Moreover，the 3D finite element analysis of a metro system incorporating the viscoelastic artificial boundaries and the proposed dynamic constitutive model was carried out. The results revealed that the optimization algorithm based on the prevent strain method is useful for the easier convergence of the simulation. The time-dependent bounding surface model is appropriate for describing the dynamic creep characteristics of soft soil and can predict effectively the accumulated settlement of soft soil under the moving metro loads of low amplitude.
骆俊晖1，缪林昌1，李仞玨2，石文博1，王 刚3. 考虑时间效应边界面模型在地铁工程中的应用[J]. 岩石力学与工程学报, 2017, 36(6): 1531-1541.
LUO Junhui1，MIAO Linchang1，LI Renjue2，SHI Wenbo1，WANG Gang3. Application of a time-dependent bounding surface model in metro engineering. , 2017, 36(6): 1531-1541.
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2017, Vol. 36 
