强震作用下水闸整体抗震稳定性分析

Analysis of overall seismic stability of sluice gates under strong earthquakes

摘要

高地震烈度区水闸动力稳定分析是坝工设计中的重要问题。依托某强震区域水闸工程，建立了水闸-库水-地基三维有限元模型，考虑无限地基辐射阻尼效应、地基岩土材料非线性以及水闸与地基动力接触非线性，采用有限元时程分析方法，进行了水闸非线性地震反应分析。以水闸整体位移发生突变、水闸与地基交界面滑动区贯通以及动力计算不收敛作为结构整体失稳的判据，对强震作用下水闸的整体稳定性进行了评价。结果表明：在各地震工况下，水闸-地基整体变形规律正常，变形量值可控，水闸整体并未沿着结构与地基交界面产生整体滑动，水闸-地基整体稳定性可以得到保证。

Abstract

The dynamic stability analysis of sluice gates in high seismic intensity areas is an important issue in dam design. Relying on a sluice gate project in a strong earthquake area, a three-dimensional finite element model of the sluice gate-reservoir water-foundation system was established. The model considered the radiation damping effect of infinite foundation, the nonlinearity of foundation rock and soil materials, and the dynamic contact nonlinearity between the sluice gate and the foundation. The finite element time history analysis method was used to conduct a nonlinear seismic response analysis of the sluice gate. The criteria for overall structural instability were the sudden change in overall displacement of the sluice gate, the penetration of the sliding zone at the interface between the sluice gate and the foundation, and the non-convergence of dynamic calculations. The overall stability of the sluice gate under strong earthquakes was evaluated. The result showed that under various seismic conditions, the overall deformation pattern of the sluice gate-foundation system was normal, the deformation values were controllable, the sluice gate did not undergo overall sliding along the interface between the structure and the foundation, and the overall stability of the sluice gate-foundation system could be guaranteed.

关键词

水闸 / 有限元 / 时程分析法 / 接触非线性 / 动力抗滑稳定

Key words

sluice gate / finite element / time history analysis method / contact nonlinearity / dynamic anti-sliding stability

Author summay

曹 海(1987—), 男, 高级工程师, 学士, 主要从事水电站调度运行研究。E-mail: [e-mail]

基金资助

中国长江电力股份有限公司资助项目(Z242302042)