基于结构分析法的重力坝坝顶水平位移预警指标拟定

Deformation Early-Warning Index for Horizontal Displacement of Gravity Dam Crest Based on Structural Analysis Method

为满足河南石漫滩水库大坝安全运行与变形监控需要,提出一种基于大坝变形监测数据、统计模型、参数反演和有限元分析的重力坝变形指标拟定方法.首先,建立坝顶顺河向位移测点的统计模型,正分析得到坝顶位移的水压分量、温度分量和时效分量;然后,建立大坝典型坝段有限元模型,选取7号坝段IP2和IP6倒垂测点作为参数反演测点,反演分析坝体弹性模量和坝基变形模量;最后,在高水位、极寒温降的最不利工况下,基于结构分析法拟定大坝坝顶位移预警指标,为大坝运行安全性态评价和位移监控工作提供了分析手段和理论支持.

In order to meet the needs of safe operation and deformation monitoring of Henan Shimantan Reservoir,this paper proposes a method for determining the deformation index of gravity dams based on dam deformation monitoring data,statistical models,parameter inversion and finite element analysis.First,the statistical model of the dam crest displacement along the river is established,and the hydraulic pressure component,temperature component and aging component of the dam crest displacement are obtained through positive analysis.Then,the finite element model of the typical dam section of the dam is established,and the 7#dam section IP2 and IP6 are selected for inversion analysis.The elastic modulus of the dam body and the deformation modulus of the dam foundation are inversely analyzed.Finally,under the most unfavorable working conditions of high water level and extremely cold temperature drop,early-warning index of dam crest displacement is formulated based on the structural analysis method,which provides analytical means and theoretical support for the evaluation of dam operation safety and displacement monitoring.