深基坑技术在大型水电站堰基中的应用研究  

Application of deep foundation pits to cofferdam foundation of large sized hydropower stations

作　　者：郭征红[1] 徐伟[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《岩土工程学报》2006年第B11期1702-1706,共5页Chinese Journal of Geotechnical Engineering

摘　　要：将深基坑技术应用到大型水工结构中,采用地下连续墙处理围堰坝基深厚覆盖层以挡土并兼作围堰堰体。从施工技术和结构分析两方面对这一新型的坝基施工方案进行综合研究:首先对施工过程中需要解决的关键工艺进行技术分析;然后,依据水工规范,核算坝体整体结构的拉压应力与抗滑稳定性,进而采用三维有限元方法,分析坝体结构在最不利工况下的受力变形特性。研究结果表明:地下连续墙的施工参数符合大型坝基施工的各项要求,更有成熟的工艺解决施工中的关键问题;坝体整体结构的受力变形与稳定性满足规范要求且安全储备较大。综合分析初步验证了深基坑技术在大型坝基施工中应用的可行性,并对施工过程提出一些建议,为同类工程设计施工提供参考。Applying deep foundation pit technology to large-scale hydraulic structure, the underground diaphragm walls were adopted to deal with the deep overburden layer of the cofferdam foundation as both retaining wall and cofferdam body. The comprehensive researches on this new-style construction scheme of dam foundation were carded out from the two aspects of construction technology and structure analysis. First, the technical analysis of the key technologies which need to be considered during construction process was made; then, according to the specifications for water conservancy and hydropower engineering, the tensile and compressive stresses and stability against sliding of the overall structure of the dam body were checked out. The three-dimensional finite element method was also employed to analyze the stress and deformation characteristics of the dam body structure under the worst operating mode. The results of these previous researches indicate that, the construction parameters of underground diaphragm wall match the condition of the large-scale dam foundation construction, furthermore, current ripe technologies can serve these key problems in the stage of construction very well; the stress status and stability of the overall dam body structure meet the demand of specifications and it has proved that the structure gets enough emergency capacity. The feasibility of the application of deep foundation pit technology to the construction of large-scale dam foundation is verified preliminarily by the comprehensive analysis, of which the function is not only to put forward some proposals for construction process, but also to provide reference to similar engineering.

关 键 词：深基坑 地下连续墙 堰基 施工方案 可行性 

分 类 号：TV551.3[水利工程—水利水电工程] TU47[建筑科学—结构工程]