Creep properties of interlayered rock mass often encountered in rock engineering, significantly affect the safety and long-term stability of practical engineering. In this study, the theoretical equations of creep strain for interlayered rock specimens when the uniaxial compression loading was applied perpendicular to or parallel with bedding plane were derived. The laws of viscoelastic deformation for soft-hard interlayered rock specimens, soft-soft interlayered rock specimens and hard-hard interlayered rock specimens were also discussed, respectively. The creep deformation characteristics obtained from the numerical simulation and the theoretical analyses were consistent, confirming the correctness of the calculation method proposed in this paper. The results showed that the viscoelastic deformation of interlayered rock specimens was not only related to the volume ratio of rock layers, but it also was affected by the spatial position of the layered structure. In addition, creep properties of hard and soft rock layers were characterized by stable creep model and unstable creep model, respectively. The influences of volume content, number of strips, buried depth, spacing and angle of soft rock interlayer on the creep properties of soft-hard interlayered rock specimens were also analyzed.

岩石工程中经常遇到的夹层岩体的蠕变特性会严重影响实际工程的安全性和长期稳定性。在这项研究中，推导了在垂直于或平行于层理平面施加单轴压缩载荷时，层间岩石样品的蠕变应变的理论方程式。分别讨论了软硬夹层岩标本，软软夹层岩标本和硬硬夹层岩标本的粘弹性变形规律。通过数值模拟和理论分析得到的蠕变变形特性是一致的，证实了本文提出的计算方法的正确性。结果表明，层间岩样的粘弹性变形不仅与岩层的体积比有关，而且还受层状结构空间位置的影响。此外，分别通过稳定蠕变模型和不稳定蠕变模型来表征硬岩层和软岩层的蠕变特性。分析了软硬夹层岩石的体积含量，带数，埋深，间距和夹角对软硬夹层岩石试样蠕变性能的影响。