The aim of this study is to investigate the propagation pattern of high-energy gas fractures in laminated rock masses by considering different in-situ stress characteristics. To this end, a numerical model was constructed in the framework of the peridynamic theory that considers the combined effect of dynamic and quasi-static loading of high-energy gas to fracture the laminated rock mass, and the validity of the model was evaluated by comparison with laboratory experiments. Accordingly, the effects of the in-situ stress magnitude, vertical in-situ stress distribution, and horizontal in-situ stress difference between strata on the propagation of fractures in laminated rock masses were investigated. The results showed that an increase in the in-situ stress is not conducive to the propagation of fractures in the laminated rock mass. Under anisotropic in-situ stress conditions, fractures were more likely to cross the interface as the stress difference between the vertical and horizontal directions increased. As the horizontal in-situ stress difference between the unfractured and initially fractured layer increased, it became increasingly difficult for the fracture to cross the interface and the fracture extension length decreases. The results can serve as reference for the analysis of the propagation behavior of high-energy gas fractures in subsurface laminated rock masses.

中文翻译：

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基于近场动力学的层状岩体地应力对高能气体裂缝扩展影响的数值研究


本研究的目的是通过考虑不同的地应力特征来研究层状岩体中高能气体裂缝的扩展模式。为此，在近场动力学理论框架下构建了考虑高能气体动、准静态加载共同作用对层状岩体破裂的数值模型，并通过对比评价了模型的有效性。与实验室实验。据此，研究了地应力大小、竖向地应力分布以及地层水平地应力差对层状岩体裂隙扩展的影响。结果表明，地应力的增加不利于层状岩体裂隙的扩展。在各向异性地应力条件下，随着垂直和水平方向应力差的增大，裂缝更容易穿过界面。随着未破裂层与初始破裂层之间的水平地应力差增大，裂缝越过界面变得越来越困难，裂缝延伸长度减小。研究结果可为地下层状岩体高能气体裂缝扩展行为分析提供参考。