温度压力耦合作用下不同层理倾角陆相页岩的破坏规律

采集鄂尔多斯盆地陆相页岩实验样品,制作成具有不同层理倾角的标准试样,研究其在不同埋深条件下即温度压力耦合作用下的三轴压缩破坏机理,裂缝形态、裂纹起始应力、裂纹破裂应力等规律。实验结果表明:鄂尔多斯盆地陆相页岩压缩破坏过程中不包括裂隙压密阶段,埋深为3 000 m左右时,压缩破坏过程不包括裂隙压密阶段和弹性阶段,试样直接塑性破坏;层理倾角和埋深对页岩裂纹起始应力、裂纹破裂应力和两者比例影响特别大;不同层理倾角和埋深的页岩的破坏机理和破裂后的裂缝形态差异均很大。

Study on Failure Mechanism of continental Shale with different Bedding Angles Under Coupling Effects of Temperature and Confining Pressure

Taken insufficient account of the effects of temperature and confining pressure on failure of rocks that many researchers at home and abroad had done before, continental shale experimental sample located in Ordos Basin have been drilled. In order to study the rule of tri-axial compression failure ,fracture morphology, crack initiation stress and crack damage stress, standard sample with different stratification angle were made from that been drilled in Ordos Basin. Results show that the failing process in axial compression of continental shale in Ordos Basin not include fracture compaction stage. When burial depth was around 3000m, the failing process in axial compression not include fracture compaction stage and elastic stage, samples were plastic broken directly. Crack initiation stress, crack damage stress and the ratio of them were affected by stratification angle and burial depth. The difference of failure mechanism and fracture morphology after failure of different stratification angle and burial depth are very obviously.