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The propagation and interaction of cracks under freeze-thaw cycling in rock-like material
International Journal of Rock Mechanics and Mining Sciences ( IF 7.2 ) Pub Date : 2022-04-21 , DOI: 10.1016/j.ijrmms.2022.105112
Xuhai Tang , Siji Tao , Ping Li , Jonny Rutqvist , Mengsu Hu , Lei Sun

In cold mountainous regions, the freeze-thaw cycling often leads to rock weathering, which might trigger spalling, significant landslides and rockfalls. In this work, we used combined experimental, theoretical and numerical approaches to investigate the mechanisms of frost cracking as a result of coupled effects of freeze-thaw cycling, confining stress and the interaction of multiple cracks. The experimental facility with a temperature cycling chamber and a high-pressure cell has been developed. We used rock-like materials (rock analogue samples made from cured cement and quartz-sand mixtures) to conduct the experiments. The rock-like samples contain pre-existing single or double initial cracks, which are then water filled and exposed to freeze-thaw cycling. The coupled thermal-hydro-mechanical modeling for analyzing fractures induced by freeze-thaw cycling was achieved by using a code that was previously developed named TOUGH-AiFrac. Good agreements between the TOUGH-AiFrac modeling and the laboratory experiments have been achieved including the exact paths of crack propagation. The experimental and numerical results show that the frost cracks tend to propagate in the direction of maximum principal stress. The results further show that the interaction effect between two frost cracks is significantly influenced by the position, orientation and offset of initial cracks, as well as the orientation of intact rock bridges between the cracks. At last, the stress shadow that was calculated by the TOUGH-AiFrac model between two cracks was discussed.



中文翻译:

类岩石材料冻融循环下裂纹的扩展和相互作用

在寒冷的山区,冻融循环经常导致岩石风化,这可能引发剥落、严重的滑坡和落石。在这项工作中,我们结合实验、理论和数值方法来研究冻融循环、围压和多个裂缝相互作用的耦合效应导致的冻裂机制。已开发出带有温度循环室和高压池的实验装置。我们使用类岩石材料(由固化水泥和石英砂混合物制成的岩石模拟样品)进行实验。类似岩石的样品包含预先存在的单个或两个初始裂缝,然后将其充满水并进行冻融循环。通过使用先前开发的名为 TOUGH-AiFrac 的代码,实现了用于分析由冻融循环引起的裂缝的热-水-力学耦合建模。裂纹扩展。实验和数值结果表明,冻裂倾向于向最大主应力方向扩展。结果进一步表明,两条冻裂裂缝的相互作用效应受初始裂缝位置、方向和偏移量以及裂缝间完整岩桥方向的影响显着。最后讨论了用TOUGH-AiFrac模型计算的两条裂缝之间的应力阴影。

更新日期:2022-04-22
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