Development of a linear parallel bond model considering damage and  parameter influence analysis

LIU Yun-he; WANG Qi; NING Zhi-yuan; MENG Xiao; DONG Jing; YANG Di-xiong

doi:10.16285/j.rsm.2021.0966

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Development of a linear parallel bond model considering damage and parameter influence analysis

更新时间：2026-06-25

- Development of a linear parallel bond model considering damage and parameter influence analysis
- Vol. 43, Issue 3, (2022)
- 作者机构：
  
  1. 西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西,西安,710048
  2. 西安理工大学水利水电学院,陕西,西安,710048
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0966
  CLC： TU45
- Online First：22 March 2022，
  
  Published：2022
- 稿件说明：
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LIU Yun-he, WANG Qi, NING Zhi-yuan, et al. Development of a linear parallel bond model considering damage and parameter influence analysis[J]. 2022, 43(3).
DOI：

LIU Yun-he, WANG Qi, NING Zhi-yuan, et al. Development of a linear parallel bond model considering damage and parameter influence analysis[J]. 2022, 43(3). DOI： 10.16285/j.rsm.2021.0966.

摘要

为研究颗粒细观接触之间的损伤、断裂过程，基于离散元颗粒流程序(PFC3D)，在平行黏结模型的基础之上，引入拉伸损伤变量和剪切损伤变量表征颗粒黏结键的变形、强度及能量演化特征，根据最大应力准则确定黏结键损伤起始判据，通过C++语言编程对该接触模型进行二次开发。对单一黏结键进行拉伸、剪切、弯曲及扭转测试，对比理论计算结果，验证了考虑损伤的平行黏结接触模型的计算精度；建立三维细观离散元模型，模拟砂岩单轴压缩试验和花岗岩三轴试验，表明了该模型的适用性和准确性。在此研究基础之上，对考虑损伤的平行黏结模型进行参数影响分析，结果表明：损伤演化系数对应力?应变全曲线的弹性段范围、峰值应力以及达到峰值应力后的软化速率有显著影响；对比研究了应力?应变曲线在不同阶段黏结键损伤、裂隙萌发、扩展及贯通的演化过程；进一步研究了弹性应变能和耗散能的演化规律，引入了耗散能释放率参数，阐释了损伤演化系数越大应力?应变曲线达到峰值应力后下降速率越快的原因。

Abstract

In order to study the damage and fracture process between particles meso-contact

the tensile damage variable and shear damage variable were introduced into parallel bond model to characterize the deformation

strength and energy evolution characteristics of particle bonding contact based on the Particle Flow Code(PFC3D). According to the maximum stress criterion

the bond damage initiation criterion was determined

and the contact model was redeveloped by C++ language. The results of tensile

shear

bending and torsion tests of single contact were compared with the theoretical results

and the accuracy of the parallel bond contact model considering damage was verified. A three-dimensional meso discrete element model was established to simulate the uniaxial compression test of sandstone and triaxial compression test of granite

showing the applicability and accuracy of the model. Based on this study

the results show that the damage evolution coefficient has a noticeable effect on the elastic range

peak stress and softening rate of the whole stress-strain curve; the evolution process of bond damage

crack germination

propagation and coalescence in different stages of the stress-strain curve was comparatively studied; the evolution law of elastic strain energy and dissipative energy was further studied

and dissipated energy was introduced. It was explained that the larger the damage evolution coefficient is

the faster the decreasing of stress-strain curve is after reaching the peak stress.

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