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岩石类材料直接拉伸破坏的FDEM数值模拟

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
有限元-离散元耦合算法(FDEM)在岩石裂纹扩展模拟中广泛应用，尤其在直接拉伸模拟中用于参数校核。然而，模拟结果通常受到拉伸速率和网格尺寸的影响。本文首先阐述FDEM基本原理;然后，建立直接拉伸数值计算模型，探究拉伸速率、网格尺寸及高径比对破坏模式和力学参数的影响;最后，给出直接拉伸模拟中建议采用的拉伸速率和网格尺寸。研究结果表明:随着拉伸速率增加，试样抗拉强度、破坏程度和峰值应变率增加，而平均弹性模量减小;在较低拉伸速率下(v≤0。01 m/s)，试样仅产生1条主拉伸裂缝;当拉伸速率较高时，有分支裂缝出现在主拉伸裂缝上侧。网格尺寸对抗拉强度、峰值应变率和平均弹性模量的影响较小，但对破坏模式和破坏程度的影响较显著。随着高径比增加，试样的抗拉强度、破坏程度和峰值应变率增大，但平均弹性模量呈相反趋势，并且高径比对破坏程度的影响较为显著。建议在直接拉伸模拟中使用0。01 m/s的拉伸速率，并将网格尺寸限制在1。5 mm以内。
Numerical simulation on direct tensile behavior of rock materials using FDEM
The combined finite-discrete element method(FDEM)is widely employed in simulating rock crack propagation,especially in direct tensile simulations for parameter validation.However,simulation results are often influenced by the tensile rate and mesh size.Firstly,the fundamental principles of FDEM was elucidated.Secondly,a direct tensile numerical model was established to investigate the effects of tensile rate,mesh size,and height-to-diameter ratio on failure patterns and mechanical parameters.Finally,recommendations for the appropriate tensile rate and mesh size in direct tensile simulations were provided.The results show that as the tensile rate increases,the tensile strength,degree of failure and peak strain rate of the specimen also increase,while the average elastic modulus decreases.When tensile rates are lower(v≤0.01 m/s),the specimen develops only a single main tensile crack.When the tensile rates are higher,branch cracks appear on the upper side of the main tensile crack.The mesh size has a minimal impact on tensile strength,peak strain rate and average elastic modulus,but it significantly affects the failure pattern and degree of failure.With the increase of height-to-diameter ratio,the tensile strength,degree of failure and peak strain rate of the specimen increase,whereas the average elastic modulus shows an opposite trend.Moreover,the height-to-diameter ratio significantly influences the degree of failure.It is recommended to use a tensile rate of 0.01 m/s and limit the mesh size to within 1.5 mm in direct tensile simulations.

direct tensile simulationscombined finite-discrete element method(FDEM)tensile ratemesh sizethe specimen height-to-diameter ratio

徐浩然、刘平、刘泉声、曹学、黄兴、罗鑫、邓鹏海

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中铁十一局集团有限公司,湖北武汉,430072

武汉大学土木建筑工程学院,湖北武汉,430072

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉,430072

直接拉伸模拟 有限元-离散元耦合算法 拉伸速率 网格尺寸 高径比

国家自然科学基金资助项目国家自然科学基金资助项目湖北省重点研发计划项目中铁十一局集团有限公司科技创新项目

U21A20153520742582021BCA13322-AI-06

2024

10.11817/j.issn.1672-7207.2024.09.016

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(9)