【摘要】 随着煤层开采深度和强度的增加，煤层顶底板岩层及煤柱的受压变形和破坏特征是决定井下施工人员安全的重要影响因素。为了研究特定煤矿岩层受压破坏特征，以葛泉矿1195工作面顶板大青灰岩为研究对象，采用室内试验、数值模拟和声发射的综合研究手段，对大青灰岩的单轴压缩破坏过程及声发射特征进行研究。室内试验结果表明，岩石破裂过程主要分为弹性阶段、屈服阶段和峰后阶段，岩石残余强度为峰值强度的40%；数值模拟结果表明，模型呈现从顶部开始的倒“V”字型断裂，RFPA^2D软件计算结果基本符合试验结果；声发射特征结果表明，模型破坏时，声发射个数和能量剧增，且主要集中出现在破坏单元处，即声发射可有效地预测该岩石的破裂位置及破裂过程。更多还原

【Abstract】 With the increase of mining depth and strength of coal seam,the compressive deformation and failure characteristics of the roof and floor strata of coal seam and coal pillar become an important factor in determining the safety of underground construction personnel. In order to study the failure characteristics of specific coal strata under compression,this paper takes the Daqing limestone roof at 1195 working face of Gequan Mine as the research object and adopts the comprehensive research methods of laboratory test,numerical simulation and acoustic emission to study the failure process and acoustic emission characteristics of Daqing limestone under uniaxial compression. The experimental results show that the rock failure process can be divided into elastic stage,yield stage and post-peak stage,and the residual strength of rock is 40% of the peak strength. The numerical simulation results show that the model presents an inverted V-shaped fracture starting from the top,and the calculated results of RFPA2^2D software are basically consistent with the experimental results. The acoustic emission characteristic results show that when the model fails,the number and energy of acoustic emission increase dramatically,and it mainly appears at the failure unit. In other words,acoustic emission can effectively predict the fracture location and process of the rock.更多还原