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。
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 andσ1 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.
作者
王刚
江成浩
陈雪畅
WANG Gang;JIANG Chenghao;CHEN Xuechang(Mining Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base,Shandong University of Science and Technology,Qingdao 266590,China;College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2021年第1期57-64,80,共9页
Coal Geology & Exploration
基金
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)。
关键词
CT三维重建
孔隙结构
数值模拟
单轴压缩
三轴压缩
CT three-dimensional reconstruction
pore structure
numerical simulation
uniaxial compression
three axis compression
