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为了研究国内盐岩剪切损伤自恢复特性,通过对国内盐岩试样损伤自恢复前、后的不完全剪切试验,分析盐岩试样在不同加载方式下表现出来的应力–应变规律以及盐岩在一定温度条件下的恢复情况,研究得出:(1)定向剪切试验结果表明,对试样进行定向重复剪切试验的初始阶段,盐岩的抗剪切强度不会发生明显降低,但是如果盐岩受到相反方向的剪切力交替作用,盐岩的抗剪切强度会出现明显而又快速地降低,这种现象说明盐岩材料的损伤特征对剪切方向很敏感;(2)对无恢复试样和恢复后试样重复剪切结果进行比较发现,恒温恢复环境对损伤盐岩自恢复有显著作用。在定向剪切和变向剪切试验中,经过一定时间的自恢复作用后的损伤试样的应力–应变曲线形状趋向于原盐试件的应力–应变曲线,这说明剪切损伤得到了一定的恢复。
In order to study the self-recovery characteristics of domestic salt rock shear damage, the stress-strain law of salt rock samples under different loading modes was analyzed through the incomplete shear tests before and after the restoration of domestic salt rock samples The results show that: (1) The results of directional shear test show that the shear strength of salt rock will not be obviously reduced in the initial stage of directional repeated shear test However, if the rock salt is subjected to alternating shear forces in the opposite direction, the shear strength of the rock salt decreases obviously and rapidly, which indicates that the damage characteristics of rock salt material are sensitive to the shear direction. ) Comparison of the results of repeated shearing of non-recovered samples and recovered samples shows that the constant-temperature recovery environment has a significant effect on the self-recovery of damaged salt rocks. In the directional shear test and the shear test, the stress-strain curve of the damaged specimen after a certain period of self-recovery tends to the stress-strain curve of the crude salt specimen, which shows that the shear damage has been certain restore.