准饱和正冻土水热力耦合模型的扩展有限元程序研发

doi:10.13722/j.cnki.jrme.2017.0513

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Abstract A method based on the extended finite element(EFM) was proposed to overcome the problem in modeling the multi-field coupling in permafrost engineering which has the characteristics of moving interface of phase transition and changing material zones. A theory capturing various couplings among the liquid transport within the pores，the force interaction between the soil skeleton and crystal ice，the energy jump during the phase-changing between ice and water was used. The governing equations for solving the primary field variables such as temperature，liquid pressure and solid displacement were derived and an analysis platform 3GEXFEM was developed. The validation of the program was accomplished by means of the numerical simulation to an experiment published by Fukuda. The results of the simulation of the temperature field，moisture distribution and heave agreed well with the experimental results. In addition，the moisture-heat-stress coupling of frozen soil during freezing process was solved under different environmental conditions such as overburden pressure，temperature gradient，temperature change mode and cooling rate, showing that 3GEXFEM program are well adapted for practical engineering.

Key words： soil mechanics quasi-saturation freezing soil thermo-hydro-mechanical coupling model program development

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	HE Min1
	2
	FENG Xiaopeng1
	LI Ning1

Cite this article:

HE Min1,2,FENG Xiaopeng1, et al. Development of the extended finite element program for the thermo-hydro-mechanical coupling model of quasi-saturated freezing soil[J]. , 2017, 36(11): 2798-2809.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0513 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/I11/2798

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