摘要
为研究复杂层状坝基的混凝土重力坝非溢流坝段的抗震性能,采用ADINA程序建立非线性有限元分析模型,以接触单元模拟缓倾角的软弱结构面,以concrete本构模型模拟混凝土材料在地震中的开裂、压碎动态特性,以Mohr-Coulomb本构模型模拟地基岩体材料在地震中的塑性屈服特性,分析了坝体位移、应力、接触面状态及极限抗震能力,研究了非溢流坝段在不同概率等级地震作用下的地震响应与破坏模式,并对复杂层状坝基重力坝的安全性能进行整体评价。结果表明,复杂层状地基结构的重力坝在地震中层间接触面能够产生一定滑移,但对坝体的应力和极限抗震能力影响不大。
In order to study the anti-seismic property of a non-overflow dam section with complex layered foundation,a nonlinear finite element model was establish by using ADINA program.Interface element was adopted to simulate weak interlayer.The concrete constitutive was applied to describe the dynamic characteristics of concrete cracking and crushing in the earthquake.The plastic characteristics of dam foundation were simulated by Mohr-Coulomb constitutive.By the calculation and analysis of displacement,stress,contact state and ultimate seismic capacity,the seismic response and failure mode of non-overflow dam section was studied under earthquake action with different probability.Finally,the overall evaluation of dam safety performance was obtained.It turns out that interface between interlayer could cause a sliding during the earthquake.However,it has nothing to do with the stress and ultimate seismic capacity of the dam.
出处
《水电能源科学》
北大核心
2015年第11期52-56,共5页
Water Resources and Power
