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目前国内水工高压隧洞结构设计尚无适用的规范可循 ,主要依据挪威准则和最小地应力准则 ,在高压隧洞应力分析时主要有面力理论和体力理论两种 .面力理论无法反映水工高压隧洞的实际受力状态 ,尤其是当水头值较高时所得计算结果失真 ;现有的体力理论往往不考虑高压固结灌浆的影响 .本文通过计算对比并结合工程实践经验 ,讨论了面力理论和体力理论的适用条件 ,并得出结论认为 ,对水头值大于 15 0m的压力隧洞 ,面力理论不适合 ,应采用体力理论 ,同时应对渗流场和应力场进行耦合分析 .并指出由于围岩是高压隧洞的主要承载结构 ,应强调高压固结灌浆的重要性 ,建议对完整的Ⅱ、Ⅲ类围岩合理的灌浆深度取为 0 75倍开挖洞径
At present, there are no applicable norms for the structural design of domestic hydraulic high-pressure tunnels, which are mainly based on the norms of Norway and the principle of minimum stress. There are mainly two kinds of theories of facial force and physical strength in the analysis of stress in high-pressure tunnels. The actual stress state of the high-pressure tunnel, especially when the head value is high, the calculation results are distorted; the existing physical theory often does not consider the impact of high-pressure consolidation grouting.Through calculation and comparison and combined with engineering practice experience, Theory and physical theory, and concludes that the theory of facial force is not suitable for the pressure tunnel with a head value greater than 150m, and physical theory should be adopted and coupled analysis of seepage field and stress field should be carried out. Rock is the main load-bearing structure of high-pressure tunnel. The importance of high-pressure consolidation grouting should be emphasized. It is suggested that the reasonable grouting depth of complete type Ⅱ and Ⅲ surrounding rock be taken as 0 75 times tunneling diameter