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利用TAW-2000D数字控制式电液伺服试验机和SDAES数字声发射检测仪,对花岗岩进行了单轴循环加卸载室内力学试验,研究了花岗岩在不同加载路径下的岩石强度特征、变形特征、声发射特征。试验结果表明:恒下限和恒差值单轴循环加卸载的平均抗压强度分别比常规单轴压缩试验增加了18.7%和13.2%,表现出了典型的脆性岩石峰值强度的强化作用;对比分析各组试验的应力应变曲线,发现试件所得到的弹性恢复时间越多,其变形极限也就随之增大;声发射事件数与应力应变曲线具有良好的对应关系,处于压密阶段和弹性压缩阶段的声发射数量较少,随着荷载不断增大,内部裂纹迅速发育,损伤程度逐渐加重,处于裂纹发育阶段的声发射现象十分活跃,分析声发射数量与应力之间的关系,论证了Kaiser效应和Felicity效应。
Using TAW-2000D digital control electrohydraulic servo testing machine and SDAES digital acoustic emission detector, the uniaxial cyclic loading and unloading indoor mechanical tests were carried out on granite. The rock strength characteristics, deformation characteristics, deformation characteristics and sound characteristics of granite under different loading paths were studied. Launch features. The experimental results show that the average compressive strength under uniaxial cyclic loading and unloading of constant lower bound and constant bound are respectively 18.7% and 13.2% higher than conventional uniaxial compression tests, which shows the strengthening effect of the typical brittle rock peak strength. Comparing analysis The stress-strain curve of each group of test shows that the more the elastic recovery time obtained from the specimen increases, the deformation limit also increases. The number of acoustic emission events and the stress-strain curve have a good correspondence, in the compaction stage and elasticity The number of acoustic emission in the compression stage is small. As the load increases, the internal cracks develop rapidly and the damage degree gradually aggravates. The acoustic emission at the crack development stage is very active. The relationship between the number of acoustic emission and the stress is analyzed. Kaiser effect and Felicity effect.