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依托多条高速公路沉管灌注桩复合地基,通过地面隆起、原位监测和检测,对沉管灌注桩挤土影响范围、不同措施减少断桩率效果等进行了试验研究,分析了断桩机理和断桩率差异的原因。研究表明,软黏土地基中预先设置竖向排水体对减少沉管灌注桩挤土效应、断桩率的作用很小,断桩的主要原因是地面隆起将桩拔断,连续施工的断桩率小于隔桩跳打,连续施工和桩身上部插筋可以有效减少断桩率。
Relying on a number of highway submerged pipe grouting pile composite foundation, through the ground uplift, in situ monitoring and testing, immersed pipe grouting pile squeeze the scope of the impact of different measures to reduce the pile break rate were studied, analyzed the broken pile mechanism and Reasons for the difference of broken pile rate. The research shows that the vertical drainage body pre-set in the soft clay foundation has a small effect on reducing the squeezing effect of pipe sinking piles and the effect of broken pile rate. The main reason for broken piles is that the ground uplift breaks the pile, and the continuous pile breaking rate Less than every block jump, continuous construction and the upper pile reinforcement can reduce the pile breakage rate.