新近吹填场地灌注桩不同桩型对比试验研究

Contrast Test Research of Bored Piles with Different Pile Type in Newly Blast-filled Ground

沿海地区新近吹填场地属于地基承载力严重不足的软弱地基,工程中常采用灌注桩对其处理以提高承载力、满足工程建设需求。该文通过对比分析普通钻孔灌注桩、后注浆灌注桩及三岔双向挤扩灌注桩(DX桩)的侧阻力和静载荷试验结果,发现后注浆灌注桩单桩承载力大幅提高,并且累计沉降符合工程质量控制要求。研究结果表明后注浆灌注桩可达到缩短工期、节省工程造价的目的。

In the coastal area, the newly blast-filled ground belongs to the soft foundation with insuffi- cient bearing capacity. It is usually processed by bored piles to improve the bearing capacity and meet the demand of engineering construction. In this paper, through analysing the pile side friction resistance and static load experiment results of ordinary bored piles ,post-grouting piles and three branch two-way enlar- ging-grounting pile （DX pile）, it founds the bearing capacity of single pile by post-grouting improves greatly, and the cumulative settlement meets the requirements of engineering quality control. The results show that the post-grouting piles can achieve the purpose of shortening the construction period and saving the project cost.