煤矿安全2018，Vol.49Issue(1)：17-20,4.DOI:10.13347/j.cnki.mkaq.2018.01.005
不同加载条件下的煤岩体压缩试验模拟研究
Simulation Research on Coal-rock Compression Tests Under Different Loading Conditions
李建乐 1郑参 1颜港 1王凯 1谢友财1
作者信息
- 1. 山东科技大学矿业与安全工程学院,山东青岛266510
- 折叠
摘要
Abstract
In order to study the characteristics of coal-rock damage evolution under different loading conditions,biaxial compression tests were virtually simulated by particle flow code (PFC).The bonded particle model was established,and the contact relationship was set.Then,the numerical simulation of the variable rate biaxial compression under different confining pressure was carried out by using the servo loading mechanism.The effect of confining pressure and loading velocity on the damage characteristics of the specimen was analyzed by studying the characteristics of some coal-rock simulation specimens about the damage morphology,micro cracks development process,stress-strain curve and acoustic emission events.The results show that:with the increase of confining pressure,the peak of axial stress of the specimen is becoming greater,and loading velocity has little effect on the peak of axial stress,there are three main stages during the micro crack development,including stable development stage,rapid increase stage and stable development stage,and the higher the damage degree of coal and rock mass,the more total number of AE events.关键词
颗粒流理论/双轴压缩/黏结颗粒模型/煤岩损伤/声发射Key words
particle flow theory/biaxial compression/bonded particle model/coal and rock damage/acoustic emission分类
矿业与冶金引用本文复制引用
李建乐,郑参,颜港,王凯,谢友财..不同加载条件下的煤岩体压缩试验模拟研究[J].煤矿安全,2018,49(1):17-20,4.
