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受地形、地质条件限制,金佛山水利枢纽溢洪道将建立在第四系覆盖层地基上,为了解覆盖层地基的变形对溢洪道结构安全的影响,采用邓肯E-v非线性模型和线弹性模型,对不同工况下溢洪道的应力变形进行了有限元分析,研究了溢洪道在垫层竣工、结构竣工和泄水运行期时的地基变形、结构应力分布及伸缩缝变形。结果表明,地基变形、溢洪道结构应力分布与伸缩缝变形等分布符合一般规律,其中地基最终沉降量绝大部分发生在溢洪道垫层施工和结构施工期间,均在覆盖层厚度大处沉降量大,故建议对覆盖层天然地基进行处理,以减小施工期间地基的沉降变形。
Due to the limited topography and geological conditions, the Jinfooshan Hydropower Project spillway will be built on Quaternary overburden foundation. To understand the effect of overburden deformation on the structural safety of spillway, Duncan Ev nonlinear model and linear elastic model The stress and deformation of the spillway under operating conditions were analyzed by finite element method. The foundation deformation, structural stress distribution and deformation of expansion joints of the spillway during the completion of the cushion, the completion of the structure and the drainage operation period were studied. The results show that the distribution of foundation deformation, the stress distribution of the spillway and the deformation of the expansion joint are in accordance with the general laws. The final subsidence of the foundation occurs during the construction and construction of the spillway cushion, Therefore, it is suggested to treat the natural foundation of the overburden to reduce the settlement of the foundation during construction.