仙女堡水电站桩基承载力有限元分析研究

为了论证桩基作为仙女堡水电站地基加固手段的理论的可行性,有必要计算桩基础承载力.以3#控河闸为例采用ANSYS建立了有限元模型,将三种水位与三种桩长组合成3种工况.计算结果表明三种水位工况下的变位及应力变化规律一致,且校核工况下变位及应力水平最高,其次为正常蓄水位,最次之为设计洪水位.天然工况下的地基沉降均超出了规范允许值,闸底板下游右侧铅直应力超过地基承载力,从理论上得出地基加固必要性.根据工程实际,对深厚覆盖层引起闸室的沉降、应力进行深入的研究,分析资料详细,可为类似工程提供借鉴经验.

Study on pile foundation bearing capacity of fairy castle hydropower station with finite element method

To demonstrate theoretical feasibility of pile foundation as one mean to reinforce fairy castle hydropower station.It is necessary to calculate pile foundation bearing capacity.Establish finite element models with ANSYS as an example to analyze three water levels and three pile lengths to 3# river sluice.The results reveled that the change rule of the settlements and stresses under the three water levels were similar.Settlements and stresses under check flood level were the largest of all,the second was normal storage level and the smallest was design flood level.Settlements under nature foundation were larger than the standard ones.Besides,vertical stresses on soleplate were larger than the nature foundation’s.Therefore it is quite necessary to reinforcement the nature foundation.Based on project,this paper carried on deep research on the settlements and stresses caused by large and deep overburden layer and obtained some valuable achievements,which could provide some advices for other similar projects.