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分析现有围岩—支护作用机理存在的不足,认为造成岩石地下工程结构现场支护不理想甚至失效的根本原因是对围岩—支护作用机理的认识在有些方面还不清楚,甚至可能是错误的。分析认为:(1)在卡斯特纳方程求解过程中,支护反力的力学处理存在缺陷,不能真实地反映岩石地下工程支护反力的物理意义;(2)由卡斯特纳方程给出的围岩特性曲线的变形是弹塑性变形,这个变形在洞室开挖后的瞬间即完成。事实上,围岩—支护相互作用是在围岩的流变变形阶段发生的,即弹塑性变形的围岩特性曲线和支护特性曲线分别属于不同的时段,两时段没有重合点,亦即这两条曲线不可能相交。要解决这一问题,必须综合应用现代非线性理论与科学、非线性流变力学理论、并考虑围岩及支护参数的时变性。
Analysis of the existing surrounding rock - support mechanism of the existing problems, that the cause of rock underground construction site support is not ideal or even failure of the fundamental reason is that the surrounding rock - support mechanism of action in some aspects is unclear, and may even it is wrong. The analysis shows that: (1) In the process of solving the Kastner equation, the mechanical treatment of the supporting reaction force is deficient and can not truly reflect the physical meaning of the reaction force of the rock supporting underground engineering. (2) The given deformation of the surrounding rock characteristic curve is elasto-plastic deformation, this deformation in the moment after the excavation of the cave is completed. In fact, the surrounding rock-support interaction takes place in the stage of rheological deformation of the surrounding rock, that is, the elastic-plastic deformation of the surrounding rock characteristic curve and the support characteristic curve belong to different time periods, respectively, and there is no coincidence point in the two periods, The two curves can not intersect. To solve this problem, we must apply the modern nonlinear theory and the theory of science and nonlinear rheology, and consider the time-varying of surrounding rock and supporting parameters.