摘要
针对施工期进行补强加固处理的高拱坝在长期服役后真实材料力学参数是否满足设计要求的问题,本文依托某施工期补强碾压混凝土拱坝工程,首先采用钻孔取芯、大坝弹性波CT及表面波法(SASW)和现场普查相结合的方法进行大坝混凝土质量检测;进而基于变形监测资料对拱坝的实测位移进行定性分析;然后通过建立径向位移统计模型进行定量分析;接着采用正交设计-BP神经网络-数值计算相结合的方法,优化反演坝体和坝基的弹性模量。研究表明:该补强拱坝坝体内部混凝土强度基本在30 MPa以上,反演获得的坝体混凝土弹性模量为30.13~33.30 GPa。虽然该补强大坝拱冠梁处测点变形偏大且存在左、右岸变形不对称的现象,但结合运行期大坝质量检测成果以及参数反演结果,可认为目前补强拱坝运行状态良好,坝体混凝土能满足设计要求。
In view of the problem of whether the actual material mechanical parameters of the high arch dam that’s reinforced during the construction period can meet the design requirements after long-term ser⁃vice,this paper,based on a reinforced RCC arch dam during the construction period,uses a combination of the methods of core drilling,elastic wave CT of dam,surface wave method(SASW)and field survey to detect the quality of dam concrete.Then,the measured displacement of the arch dam is qualitatively an⁃alyzed based on the deformation monitoring data.Next,the statistical model of the radial displacement is es⁃tablished to perform quantitative analysis.Subsequently,orthogonal design,BP neural network,and a nu⁃merical calculation method are combined to invert the elastic modulus of dam body and dam foundation.The results show that the strength of the concrete in the arch dam is more than 30MPa,and the elastic modulus of the concrete obtained by inversion is 30.13~33.30 GPa.Although the deformation of the measur⁃ing points at the arch crown beam of the arch dam is large and the deformation of the left and right banks is asymmetric,by combining with the dam quality inspection results and parameter inversion results,it can be concluded that the current operation state of the arch dam is good,the dam concrete can meet the design requirements.
作者
谢同
黄耀英
徐耀
丁胜勇
费大伟
XIE Tong;HUANG Yaoying;XU Yao;DING Shengyong;FEI Dawei(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,China;Department of Material,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《中国水利水电科学研究院学报》
北大核心
2021年第4期400-410,共11页
Journal of China Institute of Water Resources and Hydropower Research
基金
国家重点研发计划(2018YFC0407103)
国家自然科学基金项目(51779130)
中国水科院基本科研业务费项目(SM0145B632017)。
关键词
补强高拱坝
质量检测
实测变形
力学参数
优化反演
reinforced high arch dam
quality inspection
measured deformation
mechanical parameters
optimization inversion
