基于变形混合模型的连拱坝补强加固工程蓄水期变形预警指标拟定  

Deformation Early-warning Index for Reinforced Multi-arch Dam During Impoundment Period Based on Deformation Hybrid Model

作　　者：詹明强 陈波[1,2] 鄢涛 ZHAN Ming-qiang;CHEN Bo;YAN Tao(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098

出　　处：《水电能源科学》2022年第7期106-110,共5页Water Resources and Power

基　　金：国家重点研发计划(2018YFC0407104);国家自然科学基金项目(52079049,51609074,51739003);中央高校基本科研业务费(B200202160)。

摘　　要：拟定工程蓄水安全预警指标,重新评估大坝工程补强加固后的安全性态非常重要,尤其是蓄水期的加固连拱坝,提出了一种基于坝体结构变形监测数据、统计模型和有限元数值模拟的加固连拱坝安全状态监测新方法。首先,利用从统计模型中提取的水压分量、改进的反演目标函数和遗传优化迭代算法,提出了一种快速优化反演大坝力学参数的方法;然后,建立了某加固连拱坝的有限元模型,模拟了大坝蓄水期随水位上升的变形行为,在相同水压变化条件下,基于模拟变形和统计模型得到的水压变形分量,采用快速优化反演方法计算了大坝老化坝段的力学参数;最后,利用正演模拟水压变形分量和统计模型的其他分量,建立了新的大坝变形预警指标。该预警指标可用于预测大坝不同水位下尤其是高水位下的变形情况。It is very important to draw up the safety warning index of water storage and re-evaluate the safety state of the dam after reinforcement, especially for the reinforced multi-arch dam during the water storage period. A new method of monitoring the safety state of reinforced multi-arch dam based on deformation monitoring data of dam body structure, statistical model and finite element numerical simulation was proposed. Firstly, a fast and optimized method of dam mechanical parameters inversion was proposed by using the water pressure component extracted from the statistical model, the improved inversion objective function and the genetic optimization iterative algorithm. Then, the finite element model of a reinforced multi-arch dam was established to simulate the deformation behavior of the dam with the rising of water level during the impoundment period. Under the same condition of water pressure change, the mechanical parameters of the aging dam section were calculated by using the water pressure deformation component obtained by the simulated deformation and statistical model. Finally, a new early warning index of dam deformation was established by using forward simulation deformation and other components of statistical model. This early warning index can be used to predict the deformation of dams at different water levels, especially at high water levels.

关 键 词：连拱坝 补强加固 参数反演 预警指标 

分 类 号：TV698.1[水利工程—水利水电工程]