水下钻孔灌注桩后注浆承载特性试验研究

Experimental Study on Bearing Characteristics of Post Grouting for Underwater Cast-in-pace Bored Piles

依托武汉市东西湖区某大型工业建筑项目进行水下钻孔灌注桩后注浆承载特性试验。基础设计采用水下钻孔灌注桩桩基,针对不同桩径、不同桩长、相同桩端持力层,分别采取后注浆与不注浆措施进行单桩承载力对比试验,且通过桩身内力测试,揭示了不同工况下桩侧、桩端阻力随桩顶荷载增加的分布规律以及桩端桩侧荷载分担比,为桩基深化设计与施工提供依据。

The experiment of post grouting for underwater cast-in-pace bored piles has been constructed based on a large industrial construction project located in the East and West Lake area in Wuhan.Underwater cast-in-pace bored piles is adopted in the foundation design.For different pile diameters,different pile lengths at the same bearing layer of pile tip,the respective experiment of the bearing capacity of single pile is tested by post grouting and non-grouting.By the internal force test of pile body,the distribution law of pile side resistance and pile tip resistance with the increase of the pile top load under different working conditions are revealed,and the pile tip and pile side load sharing ratios are also obtained,which provides reference for the further design and construction of the pile foundation.