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岩体是流变体,在高地应力的长时间作用下其内部非均匀应力随着时间自我松弛,逐渐趋向于静水压力状态。在这样的状态下,虽然其体积仍维持弹性,但丧失了进一步抵抗剪切变形的能力,处于流动的状态,其能量储存具有体积的特征。采用平面压缩模型,研究岩石在不同应力水平长期作用下的变形性状及能量分配关系,给出在快速卸荷条件下发生自持续动力断裂破坏条件,以期揭示深部岩体初始地应力水平(能量在体变及形变上的分配关系)对卸荷条件下岩体运动过程中表现的惯性、黏性及弹塑性变形的影响规律,为建立深部岩体加卸荷本构关系打下基础。
The rock mass is a rheological body. Under the action of high ground stress for a long time, its internal non-uniform stress relaxes gradually with time and tends to hydrostatic pressure gradually. In this state, although its volume remains elastic, it loses its ability to resist shear deformation further and is in a state of flow whose energy storage has a volumetric character. The plane compression model is used to study the deformation characteristics and energy distribution of rock subjected to long-term stress at different stress levels. The condition of self-sustaining dynamic fracture under rapid unloading conditions is given in order to reveal the initial stress level of deep rock mass Body deformation and deformation) on the inertia, viscosity and elastic-plastic deformation of the rock mass under unloading condition in order to establish the foundation for the loading and unloading constitutive relation of the deep rock mass.