平原水库坝下放水兼放空涵洞沉降变形分析  

Analysis on settlement of the discharge culvert under an earth dam in a plain-area

作　　者：邵宇[1] 邓刚[1] 徐泽平[1] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100048

出　　处：《中国水利水电科学研究院学报》2009年第4期275-280,共6页Journal of China Institute of Water Resources and Hydropower Research

摘　　要：坝下涵洞是平原水库大坝中重要建筑物,其应力变形特性关系到涵洞的工作性状,同时也直接影响大坝的安全。本文采用不同的土体本构模型,利用三维非线性有限元数值计算方法对某平原水库大坝及坝下涵洞的应力变形进行了研究,并对涵洞下地基砾质土换填料及坝基土材料特性对涵洞沉降变形的影响进行了分析。根据计算分析结果,得出坝体应力变形的数值和分布符合常规土石坝的应力变形分布规律,涵管底部采用换填土料对控制涵管的沉降变形起到了较为明显的作用,涵管下部基础土体的材料特性对涵管的沉降变形仍有一定程度的影响,坝体的断面设计及设计中所采用的处理方案是可行的等结论,进一步检验了设计的合理性。The culvert is an important structure for an earth dams in a plain area.The stresses and deformation features of the culvert have influence on not only the performance of the culvert itself,but also on the dam safety.By employing different constitutive models of soil,the stress and deformation propertyies of an earth dam and the culvert under the dam have been analyzed by FEM. The impacts of the material properties of foundation soil and the measures of using backfill gravel material are analyzed.The result reveals that the values and the distribution of stress and deformation of the earth dam are in a normal range.The replacement of original foundation soil with backfilled gravel material under the culvert has a significant impact on reducing the settlement of the culvert.However it should also be noticed that the properties of the deeper foundation still have certain impact on the settlement of the culvert.Based on the analysis,the engineering design of the earth dam and culvert is checked and verified.

关 键 词：土坝 涵洞 沉降变形 

分 类 号：TV223.2[水利工程—水工结构工程]