摘要
随着堆石坝筑坝高度不断增加,常规大坝安全监测手段已无法满足需要。为此,提出了基于MEMS加速度计组合测量的准分布式大坝变形监测技术,对柔性测斜仪的具体组成、监测原理进行了阐述,并进行室内试验。试验分析表明:在水平安装(2D模式)时,垂直向位移测量误差为3%左右;在垂直安装(3D模式)时,柔性测斜仪在垂直方向为基准±60°可信区间内,水平位移测量误差2%左右;通过三次样条插值对位移曲线进行误差修正。消除了由测量控制点和测点间距产生的误差,提高了测量精度。柔性测斜仪具有高精度、大量程、能判断位移变化绝对的方向的优点,在大坝变形监测方面具有广阔的运用前景。
As the height of dams for rockfill dams continues to increase,conventional dam safety monitoring methods are no longer sufficient.To this end,a quasi-distributed dam deformation monitoring technology based on MEMS accelerometer combination measurement is proposed.The specific composition and monitoring principle of the flexible inclinometer are expounded and indoor experiments are carried out.The experimental analysis shows that in the horizontal installation(2D mode),the vertical displacement measurement error is about 3%.In the vertical installation(3D mode),the flexible inclinometer is in the vertical direction within the reference±60°confidence interval,horizontal.The displacement measurement error is about 2%.The displacement curve is corrected by cubic spline interpolation.The error caused by the measurement control point and the measuring point spacing is eliminated,and the measurement accuracy is improved.The flexible inclinometer has the advantages of high precision,large range,and ability to judge the absolute direction of displacement change,and has broad application prospects in dam deformation monitoring.
作者
郑天翱
蔡德所
陈声震
林成锋
李书恒
杨佳星
ZHENG Tian-ao;CAI De-suo;CHEN Sheng-zhen;LIN Cheng-feng;LI Shu-heng;YANG Jia-xing(College of Civil Engineering and Architecture, Three Gorges University, Yichang 443002, Hubei Province, China;College of Hydraulic and Environment, Three Gorges University,Yichang 443002, Hubei Province, China)
出处
《中国农村水利水电》
北大核心
2020年第7期190-195,共6页
China Rural Water and Hydropower
基金
国家自然科学基金重点项目(51439003)。
