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建立围岩-支护相互作用流变变形机制的数学力学模型是解决岩石地下工程支护问题的有效途径,其关键问题是,在围岩产生流变变形的过程中支护是如何对围岩进行作用的。根据基于Levy-Mises本构关系及D-P屈服准则的轴对称圆巷的理想弹塑性解、一维蠕变曲线的等时曲线相似的假设以及三维流变试验结果,推导出了原岩应力和被动支护反力均为恒载,且巷道围岩为三维应力状态下的蠕变方程及轴对称圆巷围岩的非线性黏弹塑性流变变形计算公式。与前人的工作相比,文中推导的公式中含有对围岩流变变形起决定作用的2个参数,即原岩应力p0和岩石材料的单轴塑性屈服应力σs,因此公式推导的理论基础更加完备、可信度更高。
It is an effective way to establish the mathematical mechanics model of rock-soil-support interaction rheological deformation mechanism to solve the rock-soil underground engineering support problem. The key question is how to support the surrounding rock during the rheological deformation of surrounding rock To play a role. According to the ideal elastoplastic solution of axisymmetric roundabouts based on Levy-Mises constitutive relation and DP yield criterion, the isochronal assumption of one-dimensional creep curve and the results of three-dimensional rheological test, the original rock stress and the passive The support reaction force is constant load, and the surrounding rock of the roadway is the creep equation in three-dimensional stress state and the nonlinear viscoelastic-plastic rheological deformation formula of surrounding rock of axisymmetric laneway. Compared with the predecessors’ work, the formula deduced in the article contains two parameters that play a decisive role in the rheological deformation of the surrounding rock, namely the original rock stress p0 and the uniaxial plastic yield stress σs of the rock material, so the theoretical basis of the formula deduction More complete, more credible.