摘要
本文用壳体理论分析了喷射砼支护的柔性特征,得到了支护的“柔度”Δ与洞室半径 r_0、喷层厚度 t 的确定关系,即Δ=(r^2_0)/(Et);给出了支护结构径向位移的计算公式。讨论了支护柔度与围岩形变压力的关系,从控制围岩变形方面浅析了支护对保持围岩稳定性的机理。
Based on the shell-structure theory and through analysis of the flexible characteristics of concrete-shotcrete support,a relation of the compliance of support △,the radius of chamber r_0 and the thickness of concrete-shotcrete t,namely Δ=(r_0~2)/(Et),are obtained; a formula of the radial displacement for support structure is given;the relationship between the support compliance and the deformation pressure surrounding rocks are discussed.At the same time, from the point of view in the deformation controll of surround ing rocks,the mechanism of the stability in using supports main tainning surrounding rocks has been analysed.
