基于修正Mohr-Coulomb屈服准则的冻结砂土损伤本构模型

doi:10.13722/j.cnki.jrme.2017.1318

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Abstract In order to investigate the strengths and deformation properties of frozen sandy soils，a damage constitutive model under different confining pressures was established to describe the strain softening under lower confining pressures, the strain hardening under higher confining pressures，and the transition process from the internal micro-fissures to macro-shear bands. The strength criterion for the micro-element of frozen sandy soil is described by the modified Mohr-Coulomb yield criterion. Due to the discreteness and randomness of the internal micro-defects and micro-fissures，an assumption is made that the distribution of the micro-element strength for frozen sandy soil obeys Weibull function. Meanwhile，a stochastic damage constitutive model is established to reflect the whole breakage process under the ambient loads，based upon the theoretical knowledge of the statistical theory and the continuum damage mechanics(CDM). The parameters are determined from the cryogenic triaxial compression tests. The distribution parameters of n and F0，along with their variation with confining pressures，are discussed in detail. In addition，the cohesion c，the internal friction angle ? and the damage variable D are analyzed under the different confining pressures. Finally，comparisons between the predicted results and experimental data demonstrate that the modified model can simulate well the whole stress-strain curves，reflect the transition process from strain softening to strain hardening, predict reasonably the volumetric strain-axial strain curves，especially both the dilatant behaviors under relatively low confining pressures and the compressive characteristics under high confining pressures.

Key words： soil mechanics frozen sandy soils modified Mohr-Coulomb yield criterion damage constitutive model Weibull random distribution micro-element strength

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	Articles by authors
	ZHANG De1
	2
	LIU Enlong1
	3
	LIU Xingyan1
	2
	ZHANG Ge1
	2
	YIN Xiao3
	SONG Bingtang1
	2

Cite this article:

ZHANG De1,2,LIU Enlong1, et al. A damage constitutive model for frozen sandy soils based on modified Mohr-Coulomb yield criterion[J]. , 2018, 37(4): 978-986.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1318 OR http://www.rockmech.org/EN/Y2018/V37/I4/978

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