己建压力隧洞复合预应力混凝土衬砌修补加固关键技术研究

Construction technique and calculation research on an anti-seepage structure of composite prestressed concrete lining in pressure diversion tunnel

提出一种复合预应力混凝土衬砌修补、加固防渗方案,该方案在原衬砌混凝土上,二次浇注一高性能纤维混凝土薄层。在新老混凝土中间设置薄钢板,通过在老混凝土表面开槽等手段,在老混凝土与防渗层之间形成一密闭中空的环形空间。利用水泥浆通过有限的径向位移对新浇注的薄层混凝土根据需要人为地施加某一数值与分布的均布压应力,使二次衬砌混凝土层具有一定数值的环向预压应力。这样可以分担部分的内水压力,而使该方案具有预应力混凝土补强加固效果及复合防渗功能。其优点是不仅省去预应力筋,达到防渗加固效果,而且施工简便,损失过水断面较小。

In order to better understand the heat budget of tributary bay in reservoir,spatial-temporal distribution of water temperature structure,water surface heat fluxes and heat transports by advection are analyzed in this paper,based on the measured water temperature,meteorological data,and shortwave radiation data which are downloaded from National Oceanic and Atmospheric Administration(NOAA).Results show that(1)water surface temperature of Zhuyi Bay ranges from12.0℃to31.6℃,and bottom temperature ranges from11.8℃to27.8℃.(2)Influenced by the interaction between the main stream and the tributary,there is temperature difference in water surface along the tributary bay,and the net heat flux at the confluence of the main stream and tributary ranges from-63.02W/m2to128.81W/m2,in the middle reaches of tributary it ranges from-62.01W/m2to116.14W/m2,and in the upstream of tributary bay it ranges from-59.31W/m2to78.04W/m2.(3)The heat transports by advection correlate with the fluctuation of water level.(4)The heat transports by advection is the main factor of the changes of water heat content in the tributary.