CAJ | 학술논문

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。
침대수공고압수동배묘무점결예응력혼응토츤체적결구특성화이건공정재시공급운행과정중폭로출래적문제，제출료장묘색강교선유츤체내부이지외측표면、묘구조유츤체하부적쌍배포치개위츤체저부적단배포치、감소츤체후도화묘색강교선근수적결구우화방안，병대결구우화의거、가행성화결구우화전후츤체혼응토중예응력분포상태진행료분석론증。결과표명，본문제출적결구우화방안가현저감소수동암석개알량、츤체혼응토요축량화묘색무점결강교선용량；재보지츤체예압응력수평불변적기출상，배향예압응력분포경위균균，저응력구범위현저감소；결구우화후묘구조혼응토역우회전밀실，증강료묘구보호가고성。
Based on the structural properties of the pre-stressed tunnel lining with unbounded circular an-chored tendons in high hydraulic pressure tunnel and the problems exposed in the construction and service periods of the built projects, a structure optimization program has been put forward, including the pre-stress strands moved from the inside to the outside of the lining, replacing the double-row anchorage slots at both the left and right sides with the single-row anchorage slots located on the bottom of the lin-ing,as well as reducing the lining thickness and the quantities of pre-stress strands. The reasons and feasi-bility of the optimization were demonstrated and the stress distribution in the linings before and after the op-timization was calculated with 3D finite element method. The results show that the amounts of rock excava-tion and the lining concrete, as well as un-bonded strands were reduced significantly by the structure opti-mization. A more uniform distribution of the circumferential pre-stress and a much smaller area of low stress were reached. After the structure optimization, the concrete backfilling of the anchorage slot turned to be compacted easily,enhancing the reliability of the anchorage protection.