挤密桩参数对黄土地基加固效果的影响研究

Research on the Infl uence of Compaction Pile Parameter on the Reinforcement Effect of Loess Foundation

为研究挤密桩参数对黄土地基加固效果的影响,文章以兰州新区现代农业双创基地建设项目为研究背景,基于有限元软件,建立挤密桩复合地基数值模型,研究挤密桩桩长、桩径和桩间距对地基沉降量的影响,最后分析三种参数与最终沉降量的关系。研究结果表明,地基沉降量与挤密桩桩长呈负相关,与挤密桩桩径呈负线性关系,与挤密桩桩间距呈正线性关系;挤密桩桩长6 m为地基沉降量的突变点,可能与下层土体承载力高于上层土体承载力有关。

In order to study the influence of compaction pile parameters on the reinforcement effect of loess foundation,this paper takes the construction project of modern agricultural innovation and entrepreneurship base in Lanzhou New Area as the research background.Based on thefinite element software,the numerical model of compaction pile composite foundation is established to study the influence of compaction pile length,pile diameter and pile spacing on foundation settlement.Finally,the relationship between three parameters and the final settlement is analyzed.The results show that:The settlement of foundation is negatively correlated with the length of the compaction pile,negatively linear with the diameter of the compaction pile,and positively linear with the spacing of the compaction pile;The compaction pile length of 6 m is the mutation point of foundation settlement,which may be related to higher bearing capacity of the lower soil layer than that of the upper soil layer.