【摘要】 讨论煤、岩体在2种组合模式下受压破坏过程中能量集聚与释放规律。通过试验分析,得出"煤–围岩"系统失稳规律,并结合红外热像、声发射、应变等监测手段,对"砂岩–煤"及"砂岩–煤–泥岩"两类组合体进行单向压缩试验,对比研究不同煤、岩组合体失稳破坏的前兆信息,得到煤、岩组合体失稳破坏过程中红外热像、声发射能谱及组合体不同部位应变的变化规律。研究结果表明,对比煤样单体,煤–岩组合试样失稳更突然,失稳前兆点更难于捕捉。更多还原

【Abstract】 The failure features of the composite samples under uniaxial loading are discussed.The characteristics of energy dissipation and translation in the process of coal-rock sample failure are analyzed;and an experimental system for analyzing the mechanism and precursory information of the failure of coal-rock composite samples is developed.The system is composed of the thermal infrared(TIR) observation system,the stress and strain measurement system,and the acoustic emission monitoring system.In order to investigate the TIR and acoustic responses of different kinds of coal-rock composite samples,two types of composites are tested,which are composed of three bars of sandstone-coal-mudstone and two bars of sandstone-coal,respectively.The uniaxial compressive load tests are carried out to observe the features of TIR,acoustic emission and strain precursory information in the process of sample failure.The detailed investigations on the precursor information of stress points are conducted based on the TIR images,infrared radiation temperature,infrared radiation images,acoustic emission,and strain date.The analytical results show that the coal-rock composite specimens are under stress accelerated accumulation state before failure.Moreover,it is more difficult to forecast the failure of coal-rock composite samples compared with the failure prediction of normal coal samples.更多还原