混凝土面板堆石坝面板挠度分布式监测试验  

Tests on distributed monitoring of deflection of concrete faces of CFRDs

作　　者：何斌[1] 何宁[1] 许滨华 蔡忍 邵翰林 张启灵 HE Bin;HE Ning;XU Bin-hua;CAI Ren;SHAO Han-lin;ZHANG Qi-ling(Department of Geotechnical Engineering,Nanjing Hydraulic Research Institute,Nanjing 210024,China;Nanjing CaZor Instruments Co.,Ltd.,Nanjing 210037,China)

机构地区：[1]南京水利科学研究院岩土工程研究所,江苏南京210024 [2]南京嘉兆仪器设备有限公司,江苏南京210037

出　　处：《岩土工程学报》2020年第5期837-844,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划课题(2018YFC1508505);国家自然科学基金面上项目(51579152)。

摘　　要：混凝土面板堆石坝的混凝土面板安全是保证混凝土面板堆石坝安全运行的最重要保障,混凝土面板的挠度变形监测是混凝土面板安全监测的主要组成部分。基于分布式光纤传感技术,提出了一种混凝土面板挠度分布式监测新技术,开展了系统试验测试验证混凝土面板挠度分布式监测新技术测量精度并论证其可行性。建立了基于Matlab程序和准分布式散点应变测试数据的挠度计算方法,结果表明该方法所得计算值与实测结果吻合,各测点挠度变形测量的绝对误差<5 mm,平均相对误差<3%,挠度变形测量准确度达到mm级,能较好监测不规则挠度变形曲线,验证良好,且实现了全断面分布式挠度变形监测,证明了混凝土面板堆石坝的面板挠度分布式监测新技术的适用性和先进性,并适合大挠度变形测量,可满足300 m级混凝土面板堆石坝在全长范围混凝土面板分布式挠度监测需求。Ensuring the safety of concrete faces is the key to the safe operation of concrete face rockfill dams(CFRDs).The deflection is an important index to monitor the integrity of a concrete face.Based on the distributed optical fiber sensing technology,a new technology is proposed to monitor the deflection of concrete faces of CFRDs,and systematic tests are carried out to verify the measurement accuracy of this new technology as well as its feasibility.Based on the Matlab program and the quasi-distributed scatter strain test data,a method for calculating deflection is established.The research findings show that the calculated deflection at each measurement point on the concrete face is consistent with the measured one at the corresponding position(the absolute error is 5 mm,and the average relative error is 3%).It is validated that this new technology can monitor the deflection including irregular deflection with millimeter accuracy.It is also suitable for the distributed monitoring of the deflection of the full section of concrete faces and the measurement of large deflection.The proposed advanced technology is proved to be applicable to monitoring the deflection of the entire concrete face of a 300-meter level CFRD in a distributed manner.

关 键 词：混凝土面板 挠度变形 分布式光纤传感技术 测量精度 

分 类 号：TU413[建筑科学—岩土工程]