透水管桩加速超静孔压消散的单桩模型试验研究

基于室内模型试验，研究透水管桩促进桩周土超静孔压消散的效果和规律。通过透水管桩和普通管桩单桩沉桩模型试验对比，发现使用透水管桩更有利于桩周土超静孔压消散，其促进作用沿深度方向递增，沿水平方向递减。在桩周土超静孔压消散前期，透水管桩的促进作用最明显，有利于加快施工进度。改变透水管桩初始排水时刻，观察桩周土超静孔压消散情况，发现初始排水时刻设在沉桩完成时的情况下，桩周土超静孔压峰值明显减小。试验结果表明，沉桩施工中，透水管桩提高了施工进度，降低了对周围环境的影响。

Model experimental study of accelerating dissipation of excess pore water pressure in soil around a permeable pipe pile

This paper aims to investigate the promotion-efficiency and law of the dissipation process of excess pore water pressure by using permeable pipe pile based on indoor model test. The contrast tests between the permeable pipe pile and normal pipe pile indicate that the permeable pipe pile is beneficial to evidently promote the dissipation of excess pore water pressure. The promoting effect increases along the depth direction and decreases along the horizontal direction. Permeable pipe pile has the most obvious effect in the early period of the dissipation of excess pore water pressure, greatly speeding up the construction progress. Through changing the initial drainage time of the permeable pipe pile and observing the variation of the excess pore pressure dissipation in the soil around the pile, it is found that the peak value of excess pore pressure is evidently reduced in the soil around the pile when the initial drainage time is set at the finished moment of pile driving. This study shows that the permeable pipe pile can improve the construction schedule and reduce the influence on the surrounding environment in the process of pile driving,