基于Flat-Joint接触模型的软化本构开发及其参数影响分析

doi:10.13722/j.cnki.jrme.2018.0007

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Abstract In order to study the bond softening effect on rock failure using the discrete element，the softening relationship of the bond crack was implanted into the Flat-Joint constitutive model. The softening effect is considered when the bonds of particles are breaking. PFC2D can call the subroutine(DLL) of constitutive model written in C++. According to the stress-strain curve，the variation of the numbers of softened bonds and broken bonds，the uniaxial compression process of rock is divided into 5 stages：a linear ascent stage，a nonlinear ascent stage，a nonlinear descent stage，a brittle stage and a residual stress stage. Bond softening occurs mainly at the nonlinear stages. The effects of strength and strain softening on the macroscopic parameters such as the peak stress，the length of nonlinear zone，the number of softening bond and Poisson ratio were analyzed in detail according to the horizontal softening curve. Finally，the fracturing energy of bond was analyzed preliminarily with the composite failure criterion. The method of simulating the rock failure with discrete element was improved.

Key words： numerical analysis particle flow code(PFC) bonded contact softening effect uniaxial compression fracturing energy

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	Articles by authors
	HE Xun1
	HE Yong1
	GUO Lei1
	PAN Xuchao1
	PANG Chunxu2
	QIAO Liang3
	TU Jian3

Cite this article:

HE Xun1,HE Yong1,GUO Lei1, et al. Development of softening constitutive model based on Flat-Joint contact #br# model and parametric analysis#br#[J]. , 2018, 37(10): 2277-2287.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0007 OR http://www.rockmech.org/EN/Y2018/V37/I10/2277

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