It is very important to determine the seepage behaviour of fractured rock mass infilling to evaluate the stability of the surrounding rock. The joint transfixion rate is the ratio of the unpenetrated length to the penetration length of a joint in a sample. Samples of the fractured rock mass infilling using different transfixion rates were prepared, and a TCQT-III low-permeability coal-rock triaxial seepage device was used to conduct three cycles of confining pressure-seepage coupling tests. Results show that the permeability is a power function in the confining pressure of the sample, and the permeability changes most significantly with the confining pressures. The permeability of the sample increases exponentially with the joint transfixion rate. The permeability loss is positively correlated with the plastic deformation of the sample; the permeability changes most significantly during the first cycle loading. There is over 60% recovery of the permeability of the sample under cyclic loading for loads that do not exceed the strength of the infilling. The stress sensitivity coefficient decreases as the confining pressure increases and is higher during the unloading stage than that during the loading stage for samples with an incomplete transfixion rate. The conclusions obtained in this study can serve as a reference for grouting applications.

中文翻译：

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循环荷载作用下不同穿透率的裂隙岩体充填渗流特性

确定裂隙岩体的渗流特性对评估围岩的稳定性非常重要。关节穿透率是样品中关节的未穿透长度与穿透长度的比率。制备了不同透透率的裂隙岩体充填样品，并采用TCQT-III型低渗煤岩三轴渗流装置进行了三个围压-渗流耦合试验。结果表明，渗透率是样品围压的幂函数，渗透率随围压变化最大。样品的渗透率随关节穿透率呈指数增加。渗透率损失与样品的塑性变形呈正相关。渗透率在第一个循环加载期间变化最大。对于不超过填充强度的载荷，在循环载荷下样品的渗透率可恢复60％以上。应力敏感系数随围压的增加而减小，并且对于不完全透过率的样品，在卸荷阶段其应力加载系数高于加载阶段。本研究得出的结论可为灌浆应用提供参考。应力敏感系数随围压的增加而减小，并且对于不完全透过率的样品，在卸荷阶段其应力加载系数高于加载阶段。本研究得出的结论可为灌浆应用提供参考。应力敏感系数随围压的增加而减小，并且对于不完全透过率的样品，在卸荷阶段其应力加载系数高于加载阶段。本研究得出的结论可为灌浆应用提供参考。