含水率及孔隙率对松软煤体强度特征影响的试验研究
发布时间：2018-12-27 19:47
【摘要】：为获得含水率及孔隙率综合影响下松软煤体强度特征的变化规律,针对淮南矿业集团新庄孜煤矿66207工作面松软煤体,运用自行研制的型煤制样装置,借助RMT-150B岩石力学试验系统,开展了不同孔隙率下松软煤体强度特征的含水率效应试验研究。研究结果表明:各孔隙率下松软煤体的单轴抗压强度随含水率的增大均呈先增后减的基本规律,最高强度对应的临界含水率具有差异性;随孔隙率的增大,煤体临界含水率呈线性增大,而含水率影响下的煤体最高强度逐渐降低。结合液桥力理论,引入液体饱和度,揭示了松软煤体力学特征演化的内在机制。研究成果阐释了松软煤体临界含水率变化的本质原因,可为实施松软煤层的安全高效开采提供理论依据。
[Abstract]:In order to obtain the change rule of soft coal body strength characteristics under the comprehensive influence of water content and porosity, aiming at the soft coal body in 66207 face of Xinzhuangzi Coal Mine of Huainan Mining Group, the self-developed briquette sample preparation device is used. With the help of RMT-150B rock mechanics test system, the moisture content effect of soft coal under different porosity was studied. The results show that the uniaxial compressive strength of soft coal under various porosity increases first and then decreases with the increase of water content, and the critical water content corresponding to the highest strength is different. With the increase of porosity, the critical water content of coal increases linearly, and the maximum strength of coal decreases gradually under the influence of water content. Combined with the theory of liquid bridge force, the internal mechanism of the evolution of mechanical characteristics of soft coal is revealed by introducing liquid saturation. The research results explain the essential reason of the change of critical moisture content of soft coal body, which can provide the theoretical basis for the safe and efficient mining of soft coal seam.
【作者单位】： 安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室;安徽理工大学能源与安全学院;淮南矿业(集团)有限责任公司;
【基金】：国家自然科学基金项目(U1361208,51574008) 深部煤矿采动响应与灾害防控安徽省重点实验室开放基金项目(KLDCMERDPC15105)
【分类号】：TD315
本文编号：2393520
[Abstract]:In order to obtain the change rule of soft coal body strength characteristics under the comprehensive influence of water content and porosity, aiming at the soft coal body in 66207 face of Xinzhuangzi Coal Mine of Huainan Mining Group, the self-developed briquette sample preparation device is used. With the help of RMT-150B rock mechanics test system, the moisture content effect of soft coal under different porosity was studied. The results show that the uniaxial compressive strength of soft coal under various porosity increases first and then decreases with the increase of water content, and the critical water content corresponding to the highest strength is different. With the increase of porosity, the critical water content of coal increases linearly, and the maximum strength of coal decreases gradually under the influence of water content. Combined with the theory of liquid bridge force, the internal mechanism of the evolution of mechanical characteristics of soft coal is revealed by introducing liquid saturation. The research results explain the essential reason of the change of critical moisture content of soft coal body, which can provide the theoretical basis for the safe and efficient mining of soft coal seam.
【作者单位】： 安徽理工大学深部煤矿采动响应与灾害防控安徽省重点实验室;安徽理工大学能源与安全学院;淮南矿业(集团)有限责任公司;
【基金】：国家自然科学基金项目(U1361208,51574008) 深部煤矿采动响应与灾害防控安徽省重点实验室开放基金项目(KLDCMERDPC15105)
【分类号】：TD315
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