强夯动力性能的显式非线性数值分析  

Explicit nonlinear numerical analysis of dynamical performance of dynamic compaction

作　　者：田水[1] 王钊[2] 

机构地区：[1]武汉理工大学土木与建筑学院,武汉430070 [2]武汉大学土木建筑工程学院,武汉430072

出　　处：《岩土力学》2008年第6期1580-1584,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金资助项目(No.50279036)

摘　　要：充分考虑碰撞中出现的材料非线性、几何非线性、接触非线性、运动非线性以及它们之间相互耦合的特性,利用显式瞬态非线性有限元分析技术分析了强夯对地基土的冲击碰撞过程,得到了夯锤与土体之间的撞击力时间历程、土体位移、应力的时间历程,并得到了落距、夯锤重量、夯锤底面积与强夯加固深度之间的相互关系,分析结果表明:土体位移滞后于土体应力,再现了夯锤与土体碰撞的整个过程,反映了强夯过程中的一般现象和基本规律。Nonlinear FEM based on explicit time integration is applied to simulating the collision process of dynamic compaction.Many characters are taken into account,such as material nonlinearity,geometric nonlinearity,contact nonlinearity,movement nonlinearity and coupling characters of them,etc.The variation processes of collision force of hammer and deformation and stress of soil have been obtained at different heights,weights and areas of hammer.The analysis results indicate that the displacement of soil lags behind the stress of soil.The collision＇s entire process of hammer and soil and the common phenomenon in the dynamic compaction’s process has been reappeared.

关 键 词：强夯 有限元法 大变形 动力接触 

分 类 号：TU470[建筑科学—结构工程]