摘要
基于大变形理论,针对已有强夯数值分析处理边界条件的不足,通过补列夯锤的刚体运动方程,较好地处理了锤土动力藕合相互作用的边界条件。建立了能调整施工参数的强夯法非线性有限元分析模型,同时,为了保证显示算法的网格稳定性,引入"生死单元法"。在同能级条件下,探讨了夯锤底面积和夯锤动量变化对加固效果的影响,分析表明,通过调整夯锤底面积的大小,可以方便地控制夯坑深度,夯锤底面积存在一个优化值,它对应的加固效果最佳;在同能级强夯下,重锤低落距是一种优化设计方案。最后通过工程试验结果,验证了本文计算模型的合理性。
Considering the local large deformation around the dynamic compacting spots, this paper presents a dynamic FEM equation in matrix form for elasto-plastic large deformation with nonlinear FEM. The ground treatment project for 300,000m2 fly-ash site in Zhenhai Port, Ningbo treated by dynamic consolidation method is calculated with the elasto-plastic large deformation transient dynamic FEM program. The shape, depth of compacting spot and the arrangement of the plastic zone in subsoil are obtained. The results by using the FEM program, which concerns double non-linearity, elasto-plasticity and large deformation, are more accordant with the practical engineering.
出处
《地下空间》
CSCD
2004年第4期427-433,464,共8页
Underground Space
基金
上海市重点学科(岩土工程)建设项目资助
