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煤岩组合体峰前轴向裂纹演化与非线性模型

发布时间:2019-01-12 07:44
【摘要】:随着中国煤炭开采深度逐渐加深,煤岩组合体的力学特性与应力 应变关系显得越来越重要。煤岩组合体的原生裂纹和煤岩体之间的界面对其力学性质有较大影响。为了探知裂纹和界面的影响,主要研究了轴向裂纹应变随应力、应变的演化特征,并基于工程应变和自然(真实)应变的概念,建立轴向裂纹闭合模型(axial crack closure model,简称ACCM)及轴向裂纹扩展模型(axial crack propagation model,简称ACPM),最后建立了峰前应力 应变关系模型。分析发现,轴向裂纹应变与轴向应变关系可分为4个阶段,即初始阶段、稳定阶段、缓慢增长阶段和快速增长阶段,轴向裂纹应变与轴向应力关系与之类似。轴向裂纹闭合模型、轴向裂纹扩展模型与峰前应力 应变模型均能够较好地与试验数据吻合,能够描述应力 应变关系的非线性特点。
[Abstract]:With the deepening of coal mining depth in China, the relationship between mechanical properties and stress and strain of coal-rock assemblages is becoming more and more important. The primary crack and the interface between coal and rock mass have great influence on the mechanical properties of coal and rock assemblage. In order to understand the influence of crack and interface, the evolution characteristics of axial crack strain with stress and strain are studied. Based on the concepts of engineering strain and natural (real) strain, the axial crack closure model (axial crack closure model, is established. The axial crack growth model (axial crack propagation model,) and the axial crack growth model (ACPM),) are used to establish the stress-strain relationship model before the peak. It is found that the relationship between axial crack strain and axial strain can be divided into four stages: initial stage, stable stage, slow growth stage and rapid growth stage. The relationship between axial crack strain and axial stress is similar. The axial crack closure model, the axial crack growth model and the pre-peak stress and strain model are in good agreement with the experimental data, and can describe the nonlinear characteristics of the stress-strain relationship.
【作者单位】: 中国矿业大学(北京)力学与建筑工程学院;河南理工大学河南省矿产资源绿色高效开采与综合利用重点实验室;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;
【基金】:国家自然科学基金优秀青年基金项目(51622404);国家自然科学基金项目(51374215,11572343) “万人计划”青年拔尖人才 河南省矿产资源绿色高效开采与综合利用重点实验室开放基金项目(S201601)联合资助项目
【分类号】:TD313


本文编号:2407520


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