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本文在岩体节理面剪切蠕变试验和完整岩石扭转蠕变试验的基础上,探讨了多组节理岩体的剪切变形规律、各向异性性态及其时间效应,用试验论证了对节理面采用所建议的“弹-粘塑性”力学模型的正确性,分别推导了在不同应力状态下节理面、完整岩石和多组节理岩体粘塑性应变速率的计算公式,提出了节理岩体大断面洞室考虑分步开挖和不同支护时间的粘弹塑性有限元数值方法.通过对某地下工程实例的计算,得出多组节理岩体洞室稳定的定景分析和评价,以及工程设计和施工的若干合理化建议.
In this paper, on the basis of shear creep test and intact rock torsion creep test of jointed rock mass, the shear deformation law, anisotropic behavior and time effect of multiple jointed rock masses are discussed. The joint surface adopts the correctness of the proposed “elastic-viscoplastic” mechanical model, and the formulas for calculating the viscoplastic strain rate of jointed surface, intact rock and multi-joint jointed rock mass under different stress states are deduced, and the jointed rock mass is proposed. The viscoelastic-plastic finite element numerical method for large-section tunnels considering step excavation and different supporting times was adopted. Through the calculation of a certain underground engineering example, the stability analysis and evaluation of multiple sets of jointed rock caverns were obtained. Several rationalization proposals for engineering design and construction.