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将西部矿区高水平应力岩层巷道顶板受力特征简化为含纵向裂隙的岩石单轴压缩问题,选取砂岩材料为试验对象,并对其强度、变形及破坏形态进行试验研究。试验结果表明:纵向裂隙砂岩随着裂隙长度的增大,峰值强度和峰值应变先逐渐减小后又有所增大,裂隙长度为42 mm时达到最小值;砂岩试样沿预制裂隙尖端发生纵向劈裂,但非均质性对主要次生裂纹的数目和扩展路径具有很大的影响。与无充填相比,石膏充填对裂隙砂岩强度的提升并不明显,而高强水泥具有较好的加固效果,与无充填相比峰值强度平均值增大22.27%。研究成果对西部矿区的岩石力学和围岩稳定性控制理论的发展具有积极意义。
The mechanics of roadway roof stress in high level stress rock strata in western mining area is simplified to uniaxial compression of rock with vertical fractures. The sandstone material is selected as test object, and its strength, deformation and failure mode are studied. The results show that the peak value and the peak value of the longitudinal fractured sandstone firstly decrease and then increase with the increase of the crack length, and reach the minimum value when the crack length is 42 mm. The longitudinal direction of the sandstone specimen along the prefabricated fracture tip The splitting, but the heterogeneity has a great influence on the number of the major secondary cracks and the propagation path. Compared with no filling, the gypsum filling has not obvious enhancement on the strength of fissured sandstone, while the high-strength cement has better reinforcing effect, and the average value of peak strength increases by 22.27% compared with no filling. The research results have positive significance for the development of rock mechanics and stability control theory of the surrounding rock in western mining area.