砂砾石隧洞设计优化

Preliminary Design Optimization of Sand-gravel Tunnels

根据《水工隧洞设计规范》(SL 279—2002),对于土洞,衬砌结构计算一般不考虑支护结构作用,若支护结构控制住变形,可视具体情况适当减少衬砌结构所承受的土压力.以新疆某砂砾石土洞工程为例,指出在该类砂砾石地层中可按围岩释放比等效支护结构,控制塑形区和破坏区发展,提出了在衬砌结构受力计算中考虑支护作用的优化方法,从而为同类工程的优化设计提供参考.

specification for design of hydraulic tunnel provisions of the tunnel in the lining structure calculations generally do not consider the founction of the supporting structure.If the supporting structure controls the deformation,the soil pressure of the lining structure should be reduced according to the specific situation.Based on the example of a sand-gravel tunnel in Xinjiang,it points out that the release ratio of the surrounding rock could be equivalent to the support structure in such rock formations,which controls the development of the shaping and damage areas.The optimization method which the role of supporting structure is considered in the calculation of the lining structure stress.This can provide a reference for the optimization design of the similar projects.