The creep behavior of rock mass, including structural plane creep and rock creep, is different from that of intact rock. It is generally recognized that the characteristics of structural planes play a crucial role in such creep behavior. However, currently there are few comprehensive systematic studies on the rheological properties of structural planes, including experimental and theoretical aspects. In this paper, marble with green schist’s weak structural planes from the Jinping secondary hydropower station were selected as samples, and multi-stage loading shear creep tests were carried out in order to analyze the shear creep characteristics of such structural planes under different normal stress conditions. The test results showed that the shear creep process of structural planes can be divided into three stages, namely the attenuation stage, the constant stage, and the accelerated creep stage. Furthermore, the degree of structural plane development and normal stress level have a great influence on the creep behavior of rock mass. Moreover, based on the testing results, we established a nonlinear viscoelastic-plastic shear creep model by adding a new rheological element to the classic Nishihara model. In addition, the comparison between the test data and the fitting curve showed that this new model could describe the viscoelastic and viscoplastic deformation of weak structural planes more accurately.

岩体的蠕变行为，包括结构面蠕变和岩石蠕变，与完整岩石的蠕变行为不同。通常认为，结构面的特性在这种蠕变行为中起着至关重要的作用。但是，目前很少有关于结构面流变特性的综合系统研究，包括实验和理论方面。本文以锦屏二级水电站的绿色片岩为弱结构面的大理石为样本，进行了多阶段荷载剪切蠕变试验，以分析这种结构面在不同法向应力条件下的剪切蠕变特征。 。试验结果表明，结构面的剪切蠕变过程可以分为三个阶段，即衰减阶段，衰减阶段，变形阶段和变形阶段。恒定阶段和加速蠕变阶段。此外，结构面的发展程度和法向应力水平对岩体的蠕变行为有很大的影响。此外，根据测试结果，我们通过在经典的Nishihara模型中添加新的流变元素，建立了非线性粘弹塑性剪切蠕变模型。此外，测试数据和拟合曲线的比较表明，该新模型可以更准确地描述薄弱结构面的粘弹性和粘塑性变形。我们通过在经典的Nishihara模型中添加新的流变元素，建立了非线性粘弹塑性剪切蠕变模型。此外，测试数据和拟合曲线的比较表明，该新模型可以更准确地描述薄弱结构面的粘弹性和粘塑性变形。我们通过在经典的Nishihara模型中添加新的流变元素，建立了非线性粘弹塑性剪切蠕变模型。此外，测试数据和拟合曲线的比较表明，该新模型可以更准确地描述弱结构平面的粘弹和粘塑性变形。