摘要
工程实践表明,"重锤低落距"和"轻锤高落距"的作用效果有较大差别。在考虑材料非线性、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特性的基础上,利用显式瞬态非线性有限元分析技术分析了强夯夯锤对地基土的冲击碰撞过程,得到了土体的运动轨迹、夯锤与土体之间的最大撞击力、撞击持续时间、夯沉等结果,分析了不同夯击方式下的能量利用效率及土的物理力学指标对夯击方式的敏感性,结果表明"重锤低落距"优于"轻锤高落距"这一结论是有条件的。
The practices show that ＂heavy hammer and low fall＂ and ＂light hammer and high fall＂ give different treatment effects. Considering material nonlinearity, geometric nonlinearity, contact nonlinearity, movement nonlinearity and coupling characters of them etc., large deformation dynamic nonlinear FEM based on explicit time integration is applied to simulating the impact process of dynamic compaction. The trace of soil, maximum collision force, collision duration have been obtained at the same single blow energy but with different combination of height and hammer weight. From the analysis, the efficiency coefficient and the influencing degrees of these soil parameters on the treatment effect are obtained. The results show the conclusion of ＂heavy hammer and low fall is superior to light hammer and high fall＂ is conditioned.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第11期3119-3123,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.50279036)
关键词
强夯
有限元法
大变形
动量
dynamic compaction
finite element method
large deformation
momentum
