关键词: 透水管桩, 超静孔压, 初始排水时刻, 模型试验

Abstract: 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,

Key words: permeable pipe pile, excess pore water pressure, initial drainage time, model test