沥青混凝土心墙堆石坝的地震反应特性分析  

Seismic response analysis of rockfill dam with asphaltic concrete core wall

作　　者：李守义[1] 马成成[1] 李炎隆[1] 涂幸[1] 

机构地区：[1]西安理工大学水利水电学院,西安710048

出　　处：《水力发电学报》2013年第6期198-202,221,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51309190);国家教育部博士点基金项目(20126118120015);陕西省重点学科建设专项(106-00X9030)

摘　　要：基于土石坝动力分析中广泛采用的等效非线性本构模型,本文对ADINA软件进行二次开发,实现土石坝的动力等效线性化模拟。结合某沥青混凝土心墙堆石坝工程,采用三维非线性有限元法,进行地震反应分析,重点对沥青混凝土心墙的绝对加速度反应、动主应力反应及动剪应力反应的分布规律进行分析。结果表明:沥青混凝土心墙顶部及坝顶附近区域的加速度反应比较大;由于受地形约束条件影响,沥青混凝土心墙在接近坝基和心墙2/3高度处与岸坡混凝土垫座相接部位动应力较大,出现了拉应力区域;心墙的动剪应力最大值发生在心墙1/2高度处与岸坡混凝土垫座相接部位,受地形约束条件影响,心墙靠近两岸混凝土垫座附近出现局部剪应力集中现象。本文的研究成果为该工程的设计提供了参考依据。This paper presents an equivalent linear simulation of the dynamics of earth-rock dam based on an equivalent nonlinear constitutive model widely used in dynamic analysis of such clam and a re-developed ADINA model. A three-dimensional nonlinear finite element method was adopted to analyze the seismic responses of a real rockfill dam with asphaltic concrete core wall, focusing on the distributions of absolute acceleration, dynamic principal stress, and dynamic shear stress over this core wall. The results reveal relatively larger acceleration responses at the top of the core wall and at the dam slope near the crest. Under the influences of topographical constraints, the core wall shows larger dynamic stress responses and tensile stresses near the dam foundation and the monolith on the right or left side. Its peak dynamic shear stress occurs at its intersection with the slope concrete pedestal at its mid height. Under the constraints, local shear stress concentration appears at the core wall locations near both river banks. This study would provide references for design of earth-rock dam.

关 键 词：水工结构 地震反应 等效非线性 沥青混凝土心墙堆石坝 

分 类 号：TV312[水利工程—水工结构工程]