摘要
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
At present,the novway rwle and the minimal ground stress rule is adopted in the design of high pressure tunnel for hydro projects in China.Surface force theory and physical force theory are being applied in the calculation.However,the surface force theory fails to reflect the actual working conditions of the tunnel and the physical force theory takes no considerfation of the impact of high pressure consolidation grouting.According to the comparison of the calculation results and combining with the engineering practice,the application conditions of surface force theory and physical force theory are discussed.It is found that the physical force theory is suitable for the case when water head is over 150m.It indicates that the water pressure is mainly supported by the surrounding rock and high pressure consolidation grouting is very important for tunnel design.For intact surrounding rock with grade Ⅱ or Ⅲ,the rational grouting depth is recommended to be 0 75 times of the tunnel diameter.
出处
《水利学报》
EI
CSCD
北大核心
2001年第7期36-40,共5页
Journal of Hydraulic Engineering
关键词
水工高压隧洞
体力理论
固结灌浆
结构设计
high pressure tunnel
hydro project
surface force theory
physical force theory
consolidation grouting
