煤岩体孔隙结构应力特征的数值模拟研究

王刚; 江成浩; 陈雪畅

doi:10.3969/j.issn.1001-1986.2021.01.006

煤岩体孔隙结构应力特征的数值模拟研究

doi: 10.3969/j.issn.1001-1986.2021.01.006

基金项目:

国家自然科学基金项目（51674158，51974176）；山东省高等学校青创科技支持计划项目（2019KJH006）；山东省自然科学杰出青年基金项目（ZR2020JQ22）

详细信息

第一作者:
王刚,1984年生,男,山东临沂人,博士,教授,从事煤矿灾害预测与防治研究.E-mail:gang.wang@sdust.edu.cn

中图分类号: TD712
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- 文章访问数: 180
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- PDF下载量: 23
- 被引次数: 0
出版历程
- 收稿日期: 2020-10-25
- 修回日期: 2020-12-28
- 发布日期: 2021-02-25

Numerical simulation of pore structure stress characteristics of coal and rock mass

摘要

摘要: 为了探究不同加载方式下煤岩体孔隙周围的应力分布规律，通过CT三维重建技术构建含有不同孔隙形状的煤岩体骨架模型，并利用ABAQUS软件进行单轴、三轴压缩实验模拟。结果表明，球状孔隙结构在单轴压缩条件下，上下区域表现为拉应力集中，左右区域表现为压应力集中。不同倾角的椭球状孔隙结构其长短轴区域的应力集中类型不同。单轴压缩过程中，轴向加载速度影响球状孔隙周围的Mises应力峰值和σ₁应力的变化；三轴压缩过程中，孔隙结构依然经历了压密、弹性、塑性和破坏4个阶段，较低的围压条件使得弹性阶段“应力-应变”曲线与“应力-时间”曲线高度重合。从微观角度为煤岩体力学研究提供了一种新的方法和思路。
- CT三维重建 /
- 孔隙结构 /
- 数值模拟 /
- 单轴压缩 /
- 三轴压缩
Abstract: In order to explore the stress distribution around the pores of coal and rock mass under different loading modes, the skeleton model of coal and rock mass with different pore shapes was constructed through CT three-dimensional reconstruction technology, and uniaxial and triaxial compression experiment simulations were conducted using ABAQUS software. The results showed that under uniaxial compression, the upper and lower regions of spherical pores showed tensile stress concentration, while the left and right regions showed compressive stress concentration. The stress concentration types in the long and short axis of elliptic pores were distinct with different dip angles. Under uniaxial compression, axial loading velocity affected the maximum values of Mises stress and σ₁ stress around spherical pores. In the process of triaxial compression, the pore structure still went through four stages of compaction, elasticity, plasticity and failure. The lower confining pressure made the "stress-strain" curve and "stress-time" curve highly coincide in the elastic stage. This study provides a new method for the study of coal and rock mechanics from the microscopic point of view.
- CT three-dimensional reconstruction /
- pore structure /
- numerical simulation /
- uniaxial compression /
- three axis compression

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