A novel numerical experimental method is developed herein to study frost-heaving cracking in fractured rock masses by reproducing the physical experimental frost-heaving process. The failure mode of a preexisting closed and water-saturated single-flaw in a rock mass during the frost-heaving process is affected by the inclination angle, flaw width, crack length, and cooling rate. Additionally, a regression model for predicting secondary crack formation and propagation is established by combining multiple stepwise regressions. Overall, the results indicate that preexisting flaw with various inclination angles, flaw lengths, and cooling rates mainly propagates along the flaw-coplanar direction. The secondary crack failure mode is most affected by the flaw width, and the length of the secondary crack increases with increasing inclination angle, flaw width, and flaw length, but decreases with increasing cooling rate. The contributions of the investigated factors to the secondary crack length follow the order: flaw width > inclination angle > cooling rate > flaw length. The results presented herein provide crucial theoretical guidance for engineering and construction projects in cold regions.

中文翻译：

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基于数值试验方法的单缺陷岩体冻胀开裂敏感性

本文开发了一种新的数值实验方法，通过再现物理实验冻胀过程来研究裂隙岩体中的冻胀开裂。岩体冻胀过程中原有封闭饱和单裂纹的破坏模式受倾角、裂纹宽度、裂纹长度和冷却速度的影响。此外，通过结合多个逐步回归，建立了预测二次裂纹形成和扩展的回归模型。总体而言，结果表明，具有不同倾角、缺陷长度和冷却速率的预先存在的缺陷主要沿缺陷共面方向传播。二次裂纹破坏模式受裂纹宽度影响最大，二次裂纹长度随倾角增加而增加，缺陷宽度和缺陷长度，但随着冷却速度的增加而减小。研究因素对二次裂纹长度的贡献顺序为：缺陷宽度>倾角>冷却速度>缺陷长度。研究结果为寒冷地区的工程建设项目提供了重要的理论指导。