基于物理钻探取芯技术的煤岩力学强度检测研究  

Research on coal and rock mechanical strength test based on physical drilling and coring technology

作　　者：张艳[1] 张柯 侯婷婷 Zhang Yan;Zhang Ke;Hou Tingting(Shaanxi Polytechnic Institute,Xianyang 712000,China;Sinohydro Bureau 7 Co.,Ltd.,Chengdu 611700,China;Shangqiu Institute of Technology,Shangqiu 476000,China)

机构地区：[1]陕西工业职业技术学院,陕西咸阳712000 [2]中国水利水电第七工程局有限公司,四川成都611700 [3]商丘工学院,河南商丘476000

出　　处：《能源与环保》2022年第9期311-318,共8页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：在山西某煤矿地下钻探了天然煤岩并进行了取芯。为了探讨煤层厚度对岩-煤-岩体(RCR)力学行为和破坏特性的影响,首先进行了单轴压缩试验研究和数值模拟,深入分析了不同煤层厚度RCR试样在常规压缩试验中的破坏力学行为。数值模拟结果表明,RCR试样的变形和强度行为不仅取决于煤的厚度,而且还取决于围压。在低围压条件下,RCR试件的整体破坏机制是煤层厚度小于30 mm时的严重破坏,而煤层厚度大于30 mm时则是剪切破坏。而在高围压条件下,当煤层厚度大于30 mm时,煤块和岩块均存在明显的剪切带;当煤层厚度小于30 mm时,破坏机制是煤块的严重破坏和岩块的剪切破坏。Natural coal and rock were drilled underground and cored in a coal mine in Shanxi Province.In order to explore the influence of coal seam thickness on the mechanical behavior and failure characteristics of rock-coal-rock mass(RCR),firstly,the uniaxial compression test and numerical simulation were carried out,the failure mechanical behavior of RCR samples with different coal seam thicknesses in conventional compression tests was deeply analyzed.Numerical simulation results showed that,the deformation and strength behavior of RCR specimens not only depend on the thickness of the coal,but also on the confining pressure.Under the condition of low confining pressure,the overall failure mechanism of the RCR specimen is severe failure when the thickness of the coal seam is less than 30 mm,and shear failure when the thickness of the coal seam is greater than 30 mm.Under high confining pressure conditions,when the thickness of the coal seam is greater than 30 mm,there are obvious shear zones in the coal and rock blocks.When the thickness of the coal seam is less than 30 mm,the failure mechanism is the severe damage of the coal block and the shearing of the rock block destroy.

关 键 词：煤矿 煤岩 钻探取芯 力学强度 试验检测 

分 类 号：TD315[矿业工程—矿井建设]