【作者】 黄建；

【导师】 栾茂田； 崔春义；

【作者基本信息】 大连理工大学 ， 岩土工程， 2008， 硕士

【摘要】 目前,国内外有许多双排钢板桩型式的围堰结构,由于其整体性强,施工手段方便成熟,监测手段也较多,因此在港口工程中被广泛的采用。为了计算方便,常规方法主要以土压力理论为基础,无法考虑诸如土石物与板桩接触特性等因素的影响。为此,本文将针对双排钢板桩围堰体系静、动力受力变形特性,采用数值计算方法手段,主要围绕以下两个方面展开:1通过建立双排钢板桩围堰体系弹塑性有限元数值模型,采用基于Mohr-Coulomb破坏准则的理想弹塑性本构模型考虑土石物的弹塑性性质,采用罚函数接触算法描述界面接触特性,针对不同水位下钢板桩围堰在加载过程中呈现的受力变形特征进行了分析与讨论2通过建立双排钢板桩围堰体系动力有限元数值模型,采用Lanczos特征值模态法提取围堰体系自然频率与振型,采用Newmark逐步积分方法求解考虑几何非线性的动力平衡方程,并在此基础上,针对水平地震力作用下钢板桩围堰体系的动力受力变形特性分别进行振型分解反应谱分析和动力时程分析,并将计算结果加以比较。更多还原

【Abstract】 At present, there are many domestic and overseas engineering practices of double-walled cofferdam with steel sheet piles. Due to its good integrity, construction convenience and multifold testing measures, double-walled cofferdam with steel sheet piles is widely employed in port engineering. For computational convenience, conventional methods is mainly based on earth-pressure theory, thus can not consider these factors such as the effects of contact behavior between backfill and sheet piles. Therefore, the static and dynamic characteristics of double-walled cofferdam with steel sheet piles are conducted around two faces as follows by numerical method in this paper:1 Based on ABAQUS codes platform, the characteristics of internal forces and deformation of double-walled cofferdam with steel sheet piles at different water heights are analyzed by developing elasto-plastic FE model in plane stress state, adopting Mohr-Coulomb yield criterion to describe the elaso-plasticity of subsoil and Coulomb contact pair theory to simulate the contact behavior between sheet piles and backfill.2 On the basis of ABAQUS programs, dynamic FEM model is developed with Lanczos eigenvalue method to abstract natural frequency and mode, and with Newmark step-by-step integration method to solve dynamic equations considering geometrical nonlinearity. And then dynamic characteristics of double-walled cofferdam with steel sheet piles are discussed by numerical analyses of seismic response spectrum method and dynamic time-history method.更多还原