滨海相软土延拓邓肯–张模型的数值模拟研究

doi:10.13722/j.cnki.jrme.2014.s2.110

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Abstract The control convergence factor θ was introduced to propose a prolongation model which could avoid the mathematical defect of Duncan-Chang model. It is proved that the Duncan-Chang model is one exception of prolongation model with the value of θ equal to 2. The prolongation model is revealed to be more suitable for simulating seashore soft soil which has strong nonlinear deformational behavior. A two-dimensional finite element program was presented using the C++ language based on the traditional Duncan-Chang model and the new prolongation model. Conventional triaxial compression tests of seashore soft soil were carried out using the new program. The results show that，θ is negatively correlated with the convergence rate of prolongation model curve when the initial tangential modulus and limit deviatoric stress were set. By changing the value of θ，the stress-strain curve with the convergence rate greater or less than that obtained from Duncan-Chang model can be derived from the prolongation model. With the same axial strain，the axial stresses of the whole specimen and the radial strains of the central units would increase with the reduce of the control convergence factor. So the minimal safety factor of the sample units would reduce. Under the same confining pressure，the control convergence factor was negatively correlated with the volume strain change. For the same volume strain，the larger the confining pressure，the more significant influence the control convergence factor would be.

Key words： soil mechanics control convergence factor Duncan-Chang model prolongation model seashore soft soil numerical simulation

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	Articles by authors
	YU Jin1
	2
	LI Tianbin2
	ZHENG Chunting1
	CAI Yanyan1
	3
	TU Bingxiong1
	MU Kang1

Cite this article:

YU Jin1,2,LI Tianbin2, et al. NUMERICAL SIMULATION RESEARCH ON PROLONGATION DUNCAN-CHANG MODEL FOR SEASHORE SOFT SOIL[J]. , 2014, 33(S2): 4271-4281.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.110 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/4271

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