拦沙坝非线性地震响应分析及极限抗震能力研究  

Nonlinear Seismic Response Analysis and Ultimate Seismic Capacity of Intercepting Sand Dam

作　　者：陈天燊 刘智[1] 赵兰浩[1] 李同春[1,2] CHEN Tian-shen;LIU Zhi;ZHAO Lan-hao;LI Tong-chun(College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Hohai University, Nanjing 210098, China)

机构地区：[1]河海大学水利水电学院,南京210098 [2]河海大学水资源高效利用与工程安全国家工程研究中心,南京210098

出　　处：《中国农村水利水电》2020年第3期134-139,共6页China Rural Water and Hydropower

基　　金：国家重点研发计划项目(2016YFC0401601)。

摘　　要：以某抽水蓄能电站拦沙坝河床坝段为例,采用线弹性模型和非线性模型研究地基断层对坝体极限抗震能力的影响。以坝体建基面在地震作用下发生瞬时失稳为破坏依据,计算了坝体破坏前坝体-地基系统损伤、渗流场演变过程以及抗滑稳定安全系数时程曲线,得到了线弹性模型和非线性模型下坝体所能承受的最大地震作用分别为2.18倍设计地震和2.67倍设计地震。结果表明:重力坝底部地基中的断层对廊道顶部和底部的应力状态有较大影响;考虑地基断层材料非线性后,坝体发生滑动破坏的主要原因是帷幕震坏和断层大面积损伤;综合考虑地基断层材料非线性以及损伤对渗流场的影响能够更好地模拟复杂地基条件下的坝体极限抗震能力。By taking the riverbed dam section of intercepting sand dam of a pumped storage power station as an example,the linear elastic model and the nonlinear model are used to study the influence of foundation fault on the ultimate seismic capacity of the dam.Based on the instantaneous instability of the dam under the earthquake effect,the damage of the dam-foundation system,the evolution process of the seepage field and the anti-sliding safety coefficient time-history curve are calculated.The maximum seismic effect that the dam can withstand is 2.18 times design earthquake in the linear model and 2.67 times design earthquake in the nonlinear model.The results show that the fault at the bottom of the gravity dam foundation has a great influence on the stress state at the top and bottom of the corridor.Considering the nonlinearity of the foundation fault material,the main cause of the sliding failure of the dam is the curtain damage and the large area damage of the fault.The nonlinearity of the fault material and the influence of the damage on the seepage field can better simulate the ultimate seismic capacity of the dam under complex foundation conditions.

关 键 词：断层影响带 极限抗震能力 地基非线性 抗滑稳定 损伤-渗流耦合 

分 类 号：TV642.2[水利工程—水利水电工程]