填石路基动力夯实离散元数值分析

本文意在使用数值计算方法分析填石路基动力夯实效果及施工设备参数优化问题。以液压夯实技术为例,基于碎石土孔隙率的变化使用二维颗粒流离散元方法对填石路基动力夯实问题进行计算分析。基于夯击前后填石材料孔隙率的改变,讨论了不同夯锤重量、不同夯锤下落高度及不同夯锤提升时间3种情况下路基的动力夯实效果及动力夯击的有效影响深度。由计算结果的对比分析可知,增大夯锤重量和提高落锤高度均可有效增强动力夯实效果及增大夯击的影响深度;增大提锤时间只能小幅提升填石路基的动力夯实效果,而对动力夯击的有效影响深度影响不大。液压夯实技术适合选用改变锤重方案来增强动力夯实效果以及增大夯击的影响深度。

Numerical Study of Dynamic Compacted Rock-filling Embankment Using Distinct Element Method

The objective of this paper is to analyze the problems of the dynamic compaction effect for rock-filling embankment using the numerical method. Based on the hydraulic impact compaction technique, the dynamic compaction for rock-filling embankment is analyzed via the particle flow distinct element method. The factors such as the weight of hammer, the drop height of the hammer and the time of hammer lifting are analyzed by the simulation of dynamic compaction. Based on the variation of porosity of the rock-filling embankment,the effect of the dynamic compaction and the influence depth of dynamic compaction for the embankment are analyzed. The results of computation show that the effect of the dynamic compaction and the influence depth of dynamic compaction of the embankment can be enhanced by increasing the weight or the drop height of the hammer. The effect of the dynamic compaction can be enhanced slightly by increasing the time of the hammer lifting, and the influence depth of dynamic compaction is not influenced by the time of the hammer lifting.