摘要
利用MTS815岩石力学测试系统和SHPB动态测试系统分别对垂直、平行2种层理方向煤岩进行静、动巴西劈裂试验研究,旨在探讨不同加载率下,层理煤岩的抗拉强度及其破坏特性。试验结果表明:(1)煤岩具有较强的各向异性特性。平行层理方向煤岩抗拉强度大于垂直层理方向煤岩的抗拉强度;平行层理方向煤岩随加载率变化,其抗拉强度的波动较垂直层理煤岩明显,离散现象更为显著;垂直层理煤岩破断形态较平行层理煤岩更具多样性。(2)煤岩抗拉强度及变形特性具有明显的应变率效应。随加载率增大,煤岩抗拉强度增大,呈线性或乘幂关系;加载率越大,煤岩越破碎。(3)煤岩自身组成成分及构造特点是煤岩离散性的重要影响因素,也是影响煤岩强度、变形各向异性特征的内在原因。
In order to investigate the tensile strength and failure characteristics of bedding coal rock under different loading rates,the static and dynamic Brazilian splitting tests were carried out with MTS815 rock mechanical test system and SHPB dynamic test system considering the vertical and parallel bedding directions. The results showed that the tensile strength of coal rock was anisotropic. The tensile strength of parallel bedding coal rock was greater than that of the vertical bedding coal rock. For the parallel bedding coal rock,the fluctuation of the tensile strength was greater with the increasing of loading rate and was significantly scattered. The vertical bedding coal rock had multiple fracturing modes. The strain rate had significant effect on the tensile strength and deformation. The tensile strength and strain rate were related linearly or in power function. The higher the loading rate was,the more severe the coal rock crushed. The composition and structural characteristics of coal rock were the important influence factors for the property discrepancy of coal rock and were the internal causes for the strength and deformation anisotropy of coal rock.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第10期2098-2105,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2011CB201201)
国家自然科学基金面上项目(51374149)
西华大学流体及动力机械教育部重点实验室(重点研究基地)开放课题(szjj2015–039)
关键词
岩石力学
煤岩
加载率
层理
巴西劈裂试验
rock mechanics
coal rock
loading rate
bedding direction
Brazilian splitting test