煤储层应力-应变、渗透性与声发射特征是煤储层压裂改造和产能评价研究的基础，声发射技术作为研究煤、岩石类材料失稳、破裂及其演化过程有效方法，已被广泛应用。采用沁水盆地西山矿区石炭系太原组8号煤层样品开展了不同围压下煤样应力-应变、渗透性与声发射试验研究，揭示了围压对煤的应力-应变、渗透性和声发射的影响及其控制机理。研究结果表明，基于煤样全应力-应变-渗透性--声发射特征，将煤的变形破坏过程划分为孔隙压缩与弹性变形阶段、塑性变形阶段和破坏失稳阶段3个阶段。在孔隙压缩与弹性变形阶段，荷载作用初期煤中孔隙-裂隙逐渐被压密，煤样渗透率下降，进入弹性变形阶段，煤样渗透率较低，声发射活动不明显。在塑性变形阶段，随着轴向应力的增大煤中裂隙扩展，煤样渗透率增大，声发射活动强度明显增高并达到峰值。破坏失稳阶段，煤的轴向应力随应变的增加而降低，煤样渗透率开始下降，声发射强度也逐渐降低。煤的轴向破坏荷载和有效弹性模量以及残余强度均随围压的增高而增大，煤样的初始渗透率、峰值渗透率和残余渗透率以及累计声发射振铃计数均随着围压的增加而降低。不同围压下煤样应力-应变、渗透率和声发射特征是不同围压下煤的破坏机制所致。

The characteristics of stress-strain,permeability and acoustic emission(AE) for coal reservoir are the basis for the study of hydraulic fracturing and the productivity evaluation of coal reservoir. As an effective method to study the instability,failure and its evolution process of coal and rock materials,the acoustic emission technology has been widely used. In this study,the stress-strain,permeability and acoustic emission tests of coal samples under different confining pressures were carried out by using No. 8 coal seam samples from Carboniferous of Taiyuan Formation in Xishan mining area of Qinshui Basin. The influence of confining pressure on the stress-strain,permeability and acoustic emission of coal and its control mechanism were revealed. The results show that the deformation and failure process of coal is divided into three stages:pore compression and elastic deformation stage,plastic deformation stage and failure instability stage. In the stage of pore compression and elastic deformation,the pores and fractures in coal are gradually compacted at the initial stage of loading,the permeability of coal sample decreases,and when it enters the stage of elastic deformation,the permeability of coal sample is low,and the AE activity is not obvious. In the plastic deformation stage,the permeability of coal sample increases with the increase of axial stress and fracture propagation,and the AE activity intensity increases significantly and reaches a peak value. At the stage of failure and instability,the axial stress of coal decreases with the increase of strain,the permeability of coal sample begins to decline,and the AE intensity also gradually decreases. The axial failure load,effective elastic modulus and residual strength of coal sample increase with the increase of confining pressure. The initial permeability,peak permeability and residual permeability of coal sample and the accumulated AE counts decrease with the increase of confining pressure. The stress-strain,permeability and AE characteristics of coal samples under different confining pressures are caused by the failure mechanism of coal under different confining pressures.