The current research on the failure theory of surrounding rock failure caused by excavation disturbance of deep buried engineering is seriously insufficient, especially under the combined conditions of true three-dimensional stress and excavation disturbance, which leads to unclear excavation responses and engineering disasters. Therefore, this study carried out true triaxial disturbance tests to investigate the mechanical characteristics of rock under excavation unloading and disturbance in deep engineering. Calculation methods for the anisotropic Young’s modulus, cohesion, friction angle and dilation angle during rock fracture were proposed to reveal their evolutions. A dynamic anisotropic mechanical model reflecting rock degradation induced by true triaxial disturbance was further established, and the numerical program was implemented in finite difference software. Numerical simulation results with proposed model were basically consistent with laboratory tests and deep engineering field monitoring data. Based on numerical simulation, a rock disturbance fracture degree index was proposed to quantitatively evaluate the fracture location, range and failure degree of surrounding rock after engineering excavation disturbance. Compared with static excavation, disturbance excavation leads to larger deformation of surrounding rock, larger depth and degree of failure, and more energy released.

中文翻译：

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新型动力各向异性力学模型及破坏程度指标的深埋隧道开挖扰动响应


目前对深埋工程开挖扰动引起的围岩破坏的破坏理论研究严重不足，特别是在真三维应力和开挖扰动的共同条件下，导致开挖响应不明确和工程灾害。因此，本研究开展了真正的三轴扰动试验，以研究深部工程中岩石在开挖、卸载和扰动下的力学特性。提出了岩石破裂过程中各向异性杨氏模量、内聚力、摩擦角和膨胀角的计算方法，以揭示其演变过程。进一步建立了反映真实三轴扰动诱导岩石退化的动力学各向异性力学模型，并在有限差分软件中实现了数值程序。所提模型的数值模拟结果与室内测试和深度工程现场监测数据基本一致。在数值模拟的基础上，提出了岩石扰动断裂程度指数，定量评价工程开挖扰动后围岩的断裂位置、范围和破坏程度。与静开挖相比，扰动开挖导致围岩变形更大，破坏深度和破坏程度更大，释放的能量更多。