强夯处治粉煤灰路基的显式动力非线性数值模拟

基于显式动力非线性有限元分析方法,利用ANSYS/LS-DYNA软件对强夯问题进行分析,得出了显式动力非线性数值模拟方法的一般步骤.结合某路基强夯实例建立三维立体模型,对碰撞过程进行数值模拟,得到了强夯加固范围及夯后土体的应力场、位移场.通过与现场实测数据的比对,验证了显式动力非线性有限元数值模拟方法在强夯问题中的适用性.在此基础上,研究和探讨了岳阳地区强夯处治粉煤灰路基中的夯锤参数选取问题,分析比较了夯后土体的沉降,结果表明同能级下重锤低落距有更好的加固效果.

Explicit Dynamic Nonlinear Numerical Simulation for Improving Fly Ash Embankment by Dynamic Compaction

Based on the explicit dynamic nonlinear finite element analysis method, ANSYS/LS-DYNA was used to analyze the dynamic compaction, and the general steps of explicit dynamic nonlinear numerical simulation method were obtained. Combined with the example of an embankment compaction, a three-dimensional model of the compaction process was simulated to get reinforcement range and fields of stress and displacement. Compared with the field data, this numerical simulation method was proved to be applicable. On this basis, the rammer selection for improving the fly ash embankment in Yueyang by dynamic compaction was studied, and the settlements of soil after dynamic compaction were analyzed and compared, and the results show that the choice of a heavier hammer under the same energy level will have a better reinforcement effect.