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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。
This paper intends to use numerical methods to analyze the dynamic compaction effect of rockfill and the optimization of construction equipment parameters. Taking hydraulic compaction technology as an example, based on the change of porosity of the gravel soil, a two-dimensional particle flow discrete element method was used to calculate and analyze the dynamic compaction problem of rockfill subgrade. Based on the change of the porosity of rockfill material before and after impacting, the dynamic compaction effect of subgrade and the effective influence depth of dynamic compaction under different ram weight, different drop height of rammer and different ram lifting time are discussed. From the comparative analysis of the calculated results, it can be seen that increasing the weight of the rammer and increasing the height of the rammer can effectively enhance the dynamic compaction effect and increase the impact depth of the rammer. Increasing the lifting time can only slightly increase the dynamic compaction effect of the rockfill subgrade , While the impact of dynamic impact on the depth of impact is not significant. Hydraulic ramming technology is suitable for use to change the hammer weight program to enhance the dynamic compaction effect and the impact of increasing the impact of ramming depth.