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通过现场试验对夯扩挤密桩加固湿陷性黄土地基的机理进行研究。利用现场取得的加固前的原状土样和加固后的土样进行室内对比试验,测定加固前、后桩间土的物理力学性质指标(如孔隙比、湿陷系数和密实系数等)的变化。根据这些结果,分析了夯扩挤密桩加固湿陷性黄土地基的效果和夯扩挤密桩在水平方向和深度方向的挤密程度和影响范围。最后讨论了工程实践中夯扩挤密桩设计应采取的合理的桩间距。
The field experiment was conducted to study the mechanism of consolidation of collapsible pile with collapsible compaction piles. The comparison of physical and mechanical properties (such as void ratio, collapsible coefficient and compact coefficient) of soil before and after reinforcement was carried out by using indoor comparison test of undisturbed undisturbed soil samples and reinforced soil samples. Based on these results, the effect of rammed compaction piles on consolidation of collapsible loess foundation and the squeezing degree and influence range of compacted piles in horizontal direction and depth direction are analyzed. Finally, the rational pile spacing should be taken for the design of rammed compaction piles in engineering practice.