针对水工高压隧洞环锚无黏结预应力混凝土衬砌的结构特性和已建工程在施工及运行过程中暴露出来的问题,提出了将锚索钢绞线由衬砌内部移至外侧表面、锚具槽由衬砌下部的双排布置改为衬砌底部的单排布置、减小衬砌厚度和锚索钢绞线根数的结构优化方案,并对结构优化依据、可行性和结构优化前后衬砌混凝土中预应力分布状态进行了分析论证。结果表明,本文提出的结构优化方案可显著减小隧洞岩石开挖量、衬砌混凝土浇筑量和锚索无黏结钢绞线用量;在保持衬砌预压应力水平不变的基础上,环向预压应力分布更为均匀,低应力区范围显著减小;结构优化后锚具槽混凝土易于回填密实,增强了锚具保护可靠性。 In view of the structural characteristics of non-bonded prestressed concrete lining of hydraulic high pressure tunnel ring anchor and the problems exposed during the construction and operation of the existing construction project, the paper puts forward that the anchor cable strand should be moved from the inside of the lining to the outside surface, From the double arrangement of the lining to the single arrangement at the bottom of the lining, the structure optimization scheme to reduce the thickness of the lining and the number of the strand of the anchor cable is established. Based on the optimization of structure, feasibility and prestressing of lining concrete before and after optimization Distribution of the status of the analysis. The results show that the structure optimization scheme proposed in this paper can significantly reduce the amount of tunnel excavation, the amount of lining concrete pouring and the amount of unbonded strand of anchor cable. While maintaining the pre-stress level of the lining unchanged, The stress distribution is more uniform and the range of low-stress area is significantly reduced; the anchored groove concrete is easy to backfill and dense after structure optimization, which enhances the protection reliability of the anchorage.