煤矿安全2017，Vol.48Issue(12)：28-32,5.DOI:10.13347/j.cnki.mkaq.2017.12.008
两向加卸载含瓦斯煤变形破裂数值模拟研究
Numerical Simulation Research on Deformation and Fracture of Coal Containing Gas Under Axial Loading and Lateral Unloading Condition
摘要
Abstract
In order to simulate the mechanical properties of coal containing gas under the condition of in-situ stress variation in front of working face,RFPA2D-Flow software is used in this paper to study the law of deformation,fracture process of coal containing gas under axial loading and lateral unloading of biaxial loading,and we discuss the effect of initial confining pressure,initial axial pressure and unloading rate on the deformation and failure of the specimen.The research results show that:in the direction of loading and unloading,the axial stress and the transverse stress increase linearly in the initial stage;when the stress reaches to the ultimate strength of the coal,the deformation and fracture of the coal will lead to a sharp stress drop,until the coal sample loses its bearing capacity;the greater the initial confining pressure and axial pressure,the smaller the unloading rate,the greater the ultimate compressive and tensile strength and the strain that coal can bear.The ultimate strength and strain are linearly related to the initial confining pressure and the initial axial pressure,however,the relationship between these mechanical parameters and the unloading rate shows a stcpwise shape.With the increase of the loading rate,the ultimate strength and strain reduction rate decrease gradually.关键词
轴向加载-横向卸载/含瓦斯煤/RFPA2D-Flow/初始围压/初始轴压/卸载速率Key words
axial loading and lateral unloading/coal containing gas/RFPA2D-Flow/initial confining pressure/initial axial pressure/unloading rate分类
矿业与冶金引用本文复制引用
宋爽,秦波涛,刘杰,王笑然..两向加卸载含瓦斯煤变形破裂数值模拟研究[J].煤矿安全,2017,48(12):28-32,5.基金项目
国家自然科学基金资助项目(51504140) （51504140）
江苏省普通高校学术学位研究生科研创新计划资助项目(KYLX16-0572) （KYLX16-0572）
中国矿业大学大学生创新基金资助项目(DC201609) （DC201609）
