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中文摘要：
为了调查抚顺红透山深部采场围岩体片麻岩的力学性能,以进一步探究该采场出现的轻微岩爆和时效性变形失稳机制,地质岩芯被加工成标准三轴试样,采用Rockman207硬岩三轴仪对其进行破坏全过程三轴试验、常偏应力卸围压破坏试验和蠕变试验。试验结果表明:由于受片麻理结构影响,试样的波速–密度–强度关联性不强,单轴和三轴强度离散性大;峰后破坏行为在40 MPa围压以内表现明显的硬岩脆性破坏特点,具有诱发岩爆的可能性;常偏应力卸围压应力路径下的强度比常规应力路径下的强度偏低,卸荷中有明显的塑性变形,预示着卸荷路径可能消耗能量,影响岩爆发生;蠕变试验发现,在低应力水平下没有蠕变变形出现,高应力水平下在典型的加速流变破坏前出现了阶跃型变形,试样破坏模式和矿山深部采场出现的时效性片帮在破坏形态上具有相似性。
英文摘要：
To investigate mechanical properties of the gneiss in deep stope at Hongtoushan copper mine,Fushun, and further study the mechanism concerning slight rock burst and time-efficient deformation failure,the standard triaxial specimens are made from the core to carry out the complete failure processing triaxial test,unloading confining pressure under constant deviator stress test and creep test by Rockman 207 triaxial apparatus. The test results show that:(1) The relevancy of wave velocity-density-strength is not strong and the scatter is significant in uniaxial and triaxial results. (2) The brittle failure behaviour on hard rock is observed when the confining pressure is lower than 40 MPa,which would lead to a potential rockburst. (3) The strength in the unloading confining pressure under constant deviator stress tests is lower than that in the conventional triaxial. The plastic deformation is apparent during the loading,which indicates that the unloading path affects the rockburst. (4) Creep deformation is not measured under low stress level and the step deformation can be seen prior to the typical accelerated creep under high stress level. The failure mode of the gneiss sample in the creep test is with high similarity in comparison with the practical rib spalling in situ.
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