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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摘要为研究黏结键软化效应在岩石破坏离散元模拟过程中的影响，将黏结裂缝模型的软化关系引入到Flat-Joint本构模型中，使颗粒间发生黏结破坏时考虑软化效应，并通过C++语言生成供颗粒流程序(PFD2D)调用的离散元本构子程序(DLL)。模拟岩石单轴压缩过程，根据其应力–应变曲线、软化黏结键数量和断裂黏结键数量变化曲线将破坏过程划分为以下5个阶段：线性上升段、非线性上升段、非线性下降段、脆性下降段和残余应力段，且黏结键软化主要发生在非线性段；并采用水平直线软化曲线详细分析软化强度和软化应变对单轴压缩峰值强度、非线性区宽度、软化黏结键数量和泊松比等宏观参数的影响；最后对复合破坏准则下黏结键的断裂能进行初步分析，完善分析岩石类材料破坏问题的颗粒离散元方法。

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	何珣1
	何勇1
	郭磊1
	潘绪超1
	庞春旭2
	乔良3
	涂建3

关键词 ：数值分析, 颗粒流程序, 黏结键, 软化效应, 单轴压缩, 断裂能

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

引用本文:

何珣1，何勇1，郭磊1，潘绪超1，庞春旭2，乔良3，涂建3. 基于Flat-Joint接触模型的软化本构开发及其参数影响分析[J]. 岩石力学与工程学报, 2018, 37(10): 2277-2287.
HE Xun1，HE Yong1，GUO Lei1，PAN Xuchao1，PANG Chunxu2，QIAO Liang3，TU Jian3. Development of softening constitutive model based on Flat-Joint contact #br# model and parametric analysis#br#. , 2018, 37(10): 2277-2287.

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

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