丹江口大坝加高工程新老混凝土结合问题研究  

Research on the Problems of Bounding State between Fresh and Old Concrete in the Dan Jiangkou Dam Heightening Project

作　　者：肖汉江[1] 崔建华[1] 徐跃之[1] 

机构地区：[1]长江科学院材料与结构研究所,武汉430010

出　　处：《南水北调与水利科技》2007年第5期8-11,30,共5页South-to-North Water Transfers and Water Science & Technology

基　　金："十一五"国家科技支撑计划重大项目"南水北调工程若干关键技术研究与应用"(2006BAB04A01)

摘　　要：在大坝加高工程中,新老混凝土结合问题是主要技术难题之一;同时,坝体加高前后的坝踵应力变化、新老坝体能否联合受力也是设计关心的主要问题。根据丹江口大坝加高施工方案,对大坝加高施工期以及完建后的运行期新老混凝土结合面工作状态、新老坝体联合受力情况、水库水位抬高后对坝踵应力影响等问题,采用数值模拟方法进行了仿真计算分析。得出了大坝加高及水库水位升高后,与大坝加高前相比,坝踵附近垂直向应力状态没有恶化;在任一时刻,新老混凝土结合面都是部分张开、部分接触,但缝面还是能有效地传递水平推力等结论。In the dam heightening project, Problems of bounding between fresh and old concrete are one of the main difficult technical problems. Simultaneously, fore and after the dam heightening, variation of the vertical stress of the dam heel and the joint work of the new and old section of the dam are also the main problems that must be considered. For making a study of above questions, an emulation computation on thermal stress of the dam heightening was carried out according to the construction scheme of the heightening project. It is concluded that： the vertical stress state of the dam heel was improved after the heightening compared with the results before. The joint face is partially open and partially close at anytime, but it can pass the horizon pushing force effectively.

关 键 词：丹江口大坝 加高工程 温度应力 接触非线性 新老混凝土结合 

分 类 号：TV68[水利工程—水利水电工程] TU37[建筑科学—结构工程]