保护层开采在低渗透高瓦斯近距离煤层中得到广泛应用，研究保护层开采扰动下的煤岩强扰动力学行为与渗透特性为进一步更加高效安全的开采被保护层煤层提供了理论支持。选取平煤集团十二矿上保护层己14煤层工作面己14-31010和被保护层己15煤层工作面己15-31030为研究对象，进行相似模拟试验和保护层开采过后被保护煤层受力分析。通过相似材料模拟试验获取保护层开采方式下被保护层的受力情况，上保护层开采过程中，煤层压力先增大后减小，采空区重新压实稳定后，应力状态近似恢复到原岩应力状态。通过对保护层开采后的被保护煤层受力分析获取煤层变形后的应力状态，上保护层开采过后，被保护层煤层产生变形，煤层上部分膨胀变形，应力小于原岩应力;下部分煤层压缩，应力大于原岩应力。结合二者的结果获取保护层开采方式下室内试验中被保护层煤层应力加载路径。依据被保护层煤层应力加载路径，设计进行采动耦合应力路径下的煤样渗流试验。试验结果表明:上保护层煤层开采过程中，同等试验条件下，被保护层煤层可承受的上保护层开采扰动应力越大，被保护层煤层开采过程中的煤体破坏应力峰值越大，体积应变越大;被保护层煤层开采过程中，M组煤样和N组煤样应力应变曲线与常规保护层卸荷三轴试验相比，扩容点出现位置明显提前;同等应力状态下，水压越大，煤样的体积应变越大;被保护层煤层开采过程中，M组煤样初始围压为35 MPa，围压对渗透率的影响大于轴压的影响，N组煤样初始围压为20 MPa，围压、轴压交替对渗透率产生主要影响，渗透率曲线呈现“W”型。两组试验中，扰动应力最大的试样破坏前的渗透率普遍大于其他试样的渗透率。

The method of protected coal seam mining has been widely used in low permeability,high gas and short dis- tance coal seams. The research on mechanical behavior and permeability of coal and rock under strong mining disturb- ance in protected coal seam mining provides a theoretical support for further efficient and safe mining of protected seam. Taking the selection of the Ji14 -31010 and Ji15 -31030 mining face at the No. 12 mine of Pingdingshan Shenma Group as a case study,the similar material simulation test and the stress analysis of the protected coal seam were car- ried out. The stress condition of the protected coal seam under the protected coal seam mining layout can be obtained by the similar material simulation test. During the mining process of the upper protective coal seam,the pressure of the coal seam increased initially and then decreased. After the goaf was re-compacted and stabilized,the stress state almost restored to the original rock stress state. The stress state of the coal seam after deformation is obtained by stress analy- sis of the protected coal seam. After mining of the upper protective seam,the protected coal seam has deformed. The top of the protected coal seam is less than that original rock stress,and the bottom of the protected coal seam is larger than the original rock stress. Combining with the similar material simulation test and the stress analysis of the protected coal seam,the stress loading path of the protected coal seam mining in laboratory test has been obtained. According to the stress loading path of the protected coal seam mining,the permeability test of mining coupled stress path has been designed and carried out. Through the experiments,some views can be concluded as follows. During the mining process of the upper protective coal seam,with the same experimental conditions,the larger the disturbance stress of the pro- tected coal seam is,the larger the peak value of failure stress is,the smaller the confining pressure is,and the larger the volume strain is. During the mining process of protected coal seam mining,the expansion point on the stress-strain curves of M group coal samples and N group coal samples are much earlier than those of conventional unloading triaxi- al tests. With the same stress state,the larger the water pressure is,the larger the volume strain of coal is. During the mining process of protected coal seam mining,the initial confining pressure of M group coal sample is 35 MPa,the in- fluence of confining pressure on permeability is greater than that of axial pressure. During the mining process of protec- ted coal seam mining,the initial confining pressure of N group coal sample is 20 MPa,the alternation of confining pres- sure and axial pressure has the main effect on permeability. The permeability curve presents a “ W” type. In both groups of experiments,the permeability of the sample with the largest disturbed stress is generally higher than that of other samples.