穿越城区组合衬砌隧洞外水内渗问题研究  

External water seepage into water conveyance tunnel across urban areas with composite lining structure

作　　者：王汉辉 陶军[2] 张存慧 苏凯[2,3,4] WANG Hanhui;TAO Jun;ZHANG Cunhui;SU Kai(Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China;State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering,Ministry of Education,Wuhan 430072,China;Hubei Key Laboratory of Water System Science for Sponge City Construction,Wuhan University,Wuhan 430072,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]武汉大学水资源工程与调度全国重点实验室,武汉430072 [3]武汉大学水工岩石力学教育部重点实验室,武汉430072 [4]海绵城市建设水系统科学湖北省重点实验室(武汉大学),武汉430072

出　　处：《水力发电学报》2023年第9期125-134,共10页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51879207)。

摘　　要：近年来我国兴建的穿越城区引水隧洞工程中采用了一种新型组合衬砌结构,由外层管片、内层不透水钢管和两者之间的回填混凝土、排水板组成。运行期内水压力经回填混凝土向外传递,外层管片朝外变形,管片间接缝会张开,进而引发外水内渗问题。结合深圳市罗田水库-铁岗水库输水隧洞工程,建立某典型洞段渗流分析的三维有限元计算模型,分析了多种外部条件下衬砌的外水内渗流量和外水压力。分析表明:完建期管片渗透系数每减小一个量级,隧洞渗流量降低约90%,回填混凝土使隧洞渗流量降低30%~40%,注浆圈对隧洞渗流量影响较小。运行期接缝为主要渗漏通道,占总渗流量的90%以上,此时注浆圈可以明显降低隧洞渗流量。隧洞渗流量的峰值出现在运行期,应作为隧洞外水内渗流量的控制条件。隧洞外水压力取值应以自密实混凝土回填后的完建期最大。In recent years,a new type of composite lining has been adopted in the construction of diversion tunnels across urban areas in China.The joint of its outer segments may open under the internal water pressure transmitted by the back-filled self-compacting concrete,thereby causing a problem of external water seepage.In this paper,a three-dimensional finite element model for the seepage in a typical tunnel section is developed;the amount of seepage flow and the external water pressure of the lining under various external conditions are examined in a case study of the Luotian Reservoir to Tiegang Reservoir water conveyance tunnel project in Shenzhen.The results show that for the tunnel in the completion stage,its seepage flow decreases by about 90%if the seepage coefficient of the outer segments is decreased by one order of magnitude.Concrete backfilling reduces the seepage by 30%~40%,and the grouting ring has little effect on the seepage.During operation,the lining joint is the main leakage channel,accounting for more than 90%of the total seepage;the grouting ring in this stage can reduce the seepage significantly.The peak seepage occurs in the operation stage,and it is thought to be a control condition of the tunnel seepage.The external water pressure determination should be based on the completion stage subsequent to the self-compacting concrete backfilling.

关 键 词：穿越城区输水隧洞 组合衬砌 外水内渗 注浆圈 渗流量 外水压力 

分 类 号：TV672.1[水利工程—水利水电工程]