导水桩复合地基处理新技术及试验研究

Technology and experimental study of water-conducting pile composite foundation

针对软土的特性和在软土地基上进行基建施工的环境特点,分析现有软土地基加固技术及其适用情况,在室内试验、模型桩试验的基础上提出了一种新型地基处理技术——导水桩复合地基处理法。通过现场试验观测分析,研究了导水桩复合地基承载力、排水固结、孔压消散、桩土应力分担状况等。结果表明:导水桩在土体中承担了竖向排水体作用,在上部填土荷载作用下与基底褥垫层构成排水系统,排水固结能力强,能迅速加速桩间土的固结,充分发挥桩间土的承载力;还可作为竖向增强体,有效传递竖向荷载,并与固结后的桩间土组合共同承载,达到控制施工后地基沉降的目的,推广应用前景良好。

Aiming at the property of soft soil and environmental characteristic of infrastructure construction on soft soil foundation,the existing soft soil foundation reinforcement technologies and applicability were analyzed.Based on indoor test and model pile test,a new type of foundation treatment technology,the water-conducting pile composite foundation treatment method was proposed.Through field test observation and analysis,the bearing capacity,drainage consolidation,pore pressure dissipation and pile-soil stress sharing of water-conducting pile composite foundation were studied.The results showed that the water-conducting pile bore the vertical drainage body in the soil,and formed a drainage system with the base cushion under the upper filling load,which accelerated the consolidation of the soil between piles and gave full play to the bearing capacity of the soil between piles.It could also be a vertical reinforcement to effectively transfer vertical load,which combined with the consolidated soil between piles to bear the load and control the settlement of the foundation after construction.