基于三维实景模型的面板堆石坝施工期变形分析  

Deformation analysis of face rockfill dam during construction based on 3D real scene model

作　　者：李多惠 赵然 曾昭高 戚顺超 杨兴国[1] Li Duohui;Zhai Ran;Zeng Zhaogao;Qi Shunchao;Yang Xingguo(College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China;PowerChina Sinohydro Bureau 7 Co.,LTD.,Chengdu 610213,China)

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国电建水电七局有限公司,四川成都610213

出　　处：《吉林水利》2023年第3期1-7,共7页Jilin Water Resources

基　　金：国家自然科学基金(51909182);四川省国际科技创新合作面上项目(2020YFH0092);四川双一流大学计划经费大学;中央高校基本科研业务费专项资金。

摘　　要：为获得更准确的坝体变形分析,采用三维激光扫描仪获取坝址区高精度的地形数据,建立三维实景有限元计算模型,精细地刻画了该坝址区独特的三维地形特征:沿顺河向左岸变缓,但右岸变陡;坝址基岩沿横河向存在上下游起伏的特性。通过有限元计算,分析了该面板堆石坝施工期坝体变形特性。结果表明:当坝体填筑到最大坝高时,最大沉降(约0.95m)发生在距坝顶1/3—1/2坝高位置处;顺河向最大位移分别为0.13m(朝上游),0.09m(朝下游);左右岸坝体朝河谷中心聚拢。坝底和两岸基岩对窄深河谷中堆石体的变形提供了较强的约束作用,两岸河谷非对称性导致了左右岸轴向位移的差异。研究表明坝体位于河流拐弯处且河谷左右岸坡度不一导致堆石体位移表现出了较强的空间效应,为更真实地对面板堆石坝变形进行预测,不应在数值计算中忽略河谷地形的空间效应。In order to obtain a more accurate deformation analysis of the dam,a 3D laser scanner was used to obtain the high-precision topographic data of the dam site,and a 3D real finite element model was established.The unique 3D topographic features of the dam site were described precisely:along the river,the left bank became slow but the right bank became steeper.The bedrock of the dam site fluctuates upstream and downstream along the Henghe River.Through finite element calculation,the deformation characteristics of the face rockfill dam are analyzed.The results show that when the dam body is filled to the maximum dam height,the maximum settlement(about 0.95m)occurs at the position of 1/3—1/2 dam height from the dam top.The maximum displacements along the river are 0.13m(upstream)and 0.09m(downstream),respectively.The dam on the left and right banks gathers towards the center of the valley.The dam bottom and bedrock on both sides of the dam provide a strong constraint on the deformation of the rockfill in the narrow and deep valley.The asymmetry of the valley on both sides leads to the difference of the axial displacement of the left and right banks.The results show that the dam body is located at the bend of the river and the slope of the left and right banks of the valley is different,which leads to the strong spatial effect of rockfill body displacement.In order to predict the deformation of the face rockfill dam more accurately,the spatial effect of the valley topography should not be ignored in the numerical calculation.

关 键 词：面板堆石坝 三维实景模型 数值分析 变形特性 

分 类 号：TV641.4[水利工程—水利水电工程]