考虑时间效应边界面模型在地铁工程中的应用

doi:10.13722/j.cnki.jrme.2015.1699

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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.

Key words： soil mechanics soft clay metro dynamic load bounding surface model time-dependent ABAQUS

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	Articles by authors
	LUO Junhui1
	MIAO Linchang1
	LI Renjue2
	SHI Wenbo1
	WANG Gang3

Cite this article:

LUO Junhui1,MIAO Linchang1,LI Renjue2, et al. Application of a time-dependent bounding surface model in metro engineering[J]. , 2017, 36(6): 1531-1541.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1699 OR http://www.rockmech.org/EN/Y2017/V36/I6/1531

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