盐岩剪切损伤自恢复特性试验研究

发布时间：2018-03-21 21:50

本文选题：岩石力学　切入点：盐岩　出处：《岩石力学与工程学报》2015年S1期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In order to study the self-recovery characteristics of domestic salt rock shear damage, the incomplete shear tests before and after the damage recovery of domestic salt rock samples were carried out. The stress and strain law of salt rock samples under different loading modes and the recovery of salt rock under certain temperature conditions are analyzed. In the initial stage of directional repeated shear test, the shear strength of salt rock does not decrease obviously, but if the salt rock is subjected to the opposite direction of shear stress alternately, The shear strength of salt rock decreases obviously and rapidly, which indicates that the damage characteristics of salt rock are sensitive to shear direction. The environment of isothermal restoration plays a significant role in the self-recovery of damaged salt rock. The shape of the stress-strain curve of the damaged specimen after a certain time of self-recovery tends to be the stress-strain curve of the original salt specimen, which indicates that the shear damage has been recovered to a certain extent.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金资助项目(51304256) 中国博士后基金项目(2013M540620) 中央高校基金项目(CDJZR13240022)
【分类号】：TU45

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