The pressurized water-rock coupling has a great influence on the long-term stability of rock engineering. In order to study the effect of axial and hydraulic pressure coupling on the creep behaviors of rock, a multi-channel fluid-solid coupling rock rheology system was used to carry out multi-loading creep experiments on the creep behaviors of sandstone. In view of the creep behaviors of the studied sandstone, a three-dimensional nonlinear Nishihara model considering hydraulic pressure was established, and the accuracy of the new model was verified. The research results showed that, with the increase of the hydraulic pressure, the creep strain of sandstone under both the same initial load and multi-step load decreased, whereas the rock creep strength and the maximum acceleration creep rate increased. Under the same hydraulic pressure and initial load, the creep strain increased with the multi-loading increasing, but the creep failure time became shorter. Through the parameter recognition of the newly proposed nonlinear creep model, the comparative analysis of theoretical and experimental results showed that the new creep model can well describe the creep behaviors of the sandstone under the pressurized water-rock coupling.

加压水岩耦合对岩石工程的长期稳定性影响很大。为研究轴向和液压耦合对岩石蠕变行为的影响，采用多通道流固耦合岩石流变系统对砂岩蠕变行为进行多载荷蠕变实验。针对所研究砂岩的蠕变行为，建立了考虑水压的三维非线性西原模型，验证了新模型的准确性。研究结果表明，随着水压力的增加，砂岩在相同初始载荷和多级载荷下的蠕变应变均减小，而岩石蠕变强度和最大加速蠕变速率增大。在相同的液压和初始载荷下，蠕变应变随着多重载荷的增加而增大，但蠕变破坏时间变短。通过对新提出的非线性蠕变模型的参数识别，理论与实验结果的对比分析表明，新的蠕变模型能够很好地描述加压水岩耦合作用下砂岩的蠕变行为。