强夯加固机理的非线性动态冲击显式有限元数值分析

NUMERICAL ANALYSIS OF THE IMPACT DYNAMICAL PERFORMANCE OF DYNAMIC COMPACTION WITH NON-LINEAR EXPLICIT DYNAMIC FEM

根据强夯的特点,采用同时考虑几何非线性、材料非线性、状态非线性,并且考虑瞬态大变形的非线性动态显式有限元,分析了强夯对地基土的冲击碰撞过程。该方法克服了以往有限元计算强夯动力问题时需再引入其他的简化假定的已知量,能较实际地反映强夯加固的动力特性。通过对工程实例计算研究,取得了令人满意的效果。

Based on the characteristics of soil dynamic consolidation （ DC ）, nonlinear FEM with momentary display function is applied to simulate the collision process of dynamic consolidation. This study simulated the dynamic consolidation of loess numerically to generate an elastic - plastic finite element representation of soils. In this study, material nonlinearity, geometric nonlinearity, contact nonlinearity, movement nonlinearity and coupling characteristics of them were taken into account. The histories of soil stress, collision force of hammer were obtained ; at the same time, the deformation of soil and soil density were acquired at different depth, and comparisons were made of the displacement and the stress of soil. The consolidation mechanism of dynamic compaction is investigated and some useful conclusions are gained.