For a long time, one of the important safety problems in open-pit mines is the stability of a large number of high slopes with gently inclined soft interlayer. Rock masses formed after long geological processes generally have some initial damage. Mining works also cause varying degrees of disturbance and damage to rock masses in the mining area during the mining process. This phenomenon means that accurate characterization of the time-dependent creep damage for rock masses under shear load is necessary. The damage variable D is defined based on the spatial and temporal evolution laws of shear modulus and initial level of damage for the rock mass. In addition, a coupling damage equation between the initial damage of the rock mass and shear creep damage is established based on Lemaitre's strain equivalence assumption. Kachanov's damage theory is also incorporated to describe the entire process of time-dependent creep damage evolution for rock masses. A creep damage constitutive model that can reasonably reflect the actual mechanical properties of rock masses under multi-stage shear creep loading conditions is established. This takes into account multi-stage shear creep loading conditions, instantaneous creep damage during the shear load phase, staged creep damage and factors influencing the initial damage of rock masses. The reasonableness, reliability and applicability of this model are verified by comparing the results of the multi-stage shear creep test with calculated values from the proposed model. As opposed to the traditional creep damage model, the shear creep model established in this present study takes into account the initial damage of rock masses and can describe the multi-stage shear creep damage characteristics of rock masses more convincingly.

中文翻译：

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考虑初始损伤的岩体新剪切蠕变损伤模型[J].

长期以来，露天矿的重要安全问题之一是大量缓倾软夹层高边坡的稳定性。经过长期地质作用形成的岩体一般都有一定的初始损伤。采矿工程在开采过程中也会对矿区内的岩体造成不同程度的扰动和破坏。这种现象意味着必须准确表征剪切载荷下岩体随时间变化的蠕变损伤。损伤变量D是根据岩体剪切模量的时空演化规律和初始损伤水平定义的。此外，基于Lemaitre应变等价假设，建立了岩体初始损伤与剪切蠕变损伤的耦合损伤方程。卡恰诺夫 还结合了s损伤理论来描述岩体随时间变化的蠕变损伤演化的全过程。建立了多阶段剪切蠕变加载条件下能合理反映岩体实际力学性质的蠕变损伤本构模型。这考虑了多阶段剪切蠕变加载条件、剪切加载阶段的瞬时蠕变破坏、阶段性蠕变破坏以及影响岩体初始破坏的因素。通过多级剪切蠕变试验结果与所建模型计算值的对比，验证了该模型的合理性、可靠性和适用性。与传统的蠕变损伤模型相反，