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针对功果桥水电站导流隧洞欠挖情况,根据进口段欠挖典型断面建立了数值仿真分析模型,比较了不同欠挖程度下衬砌结构的受力特征,分析了衬砌和围岩间粘结强度对衬砌结构的影响,并采用内力法对衬砌内的配筋进行了复核。结果表明,随欠挖程度的增加,衬砌实际厚度减小;在外水压力作用下,衬砌变形逐渐增大,应力也随之增加,衬砌安全度逐渐减小;在衬砌与围岩间粘结强度为0.4MPa,且欠挖深度在衬砌厚度的40%(欠挖92cm)及其以上时,衬砌结构的安全将得不到保证;同时衬砌与围岩间粘结强度对边墙和底板的变形和应力影响较大,而对顶拱位置影响较小。
Aiming at the under-dredging situation of diversion tunnel in Gongguoqiao Hydropower Station, a numerical simulation analysis model is established according to the typical section of under-excavation in inlet section. The stress characteristics of lining structure under different under-excavation degrees are compared. The bond strength between lining and surrounding rock The impact on the lining structure, and the use of internal force method to check the lining reinforcement. The results show that with the increase of under-excavation, the actual lining thickness decreases. Under the external water pressure, the deformation of lining increases and the stress increases, and the safety of the lining decreases gradually. The bond strength between lining and surrounding rock Is 0.4MPa, and the undercutting depth is less than 40% of the lining thickness (less than 92cm), the safety of the lining structure can not be guaranteed. Meanwhile, the deformation of the side wall and the floorboard between the lining and the surrounding rock And stress greater impact, but less impact on the position of the arch.