Influence of normal and reverse mud circulations on hole diameter of cast-in-situ bored pile s
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摘要: 在软土地区,钻孔灌注桩的成孔过程都要采用泥浆护壁。结合上海浦东某高层住宅小区钻孔灌注桩孔径实测数据 ,对成桩过程中两种泥浆循环方式对孔径的影响进行了对比研究, 并对其机理进行了探讨 。研究结果表明 : 在上海软土地区 , 采用正循环泥浆护壁能在一定程度上 增大孔壁粗糙度 ,扩大桩孔直径,对增加桩的承载力有一定作用。Abstract: In soft soil area it is necessary to take use of mud protection in the forming process of cast-in-situ bored piles. Based on the measured data of cast-in-situ bored piles of a high-rise residential in Pudong District of Shanghai, the influence of two kinds of mud circulations on the diameter of pile hole is studied, and its mechanism is discussed. The results show that in Shanghai, the soft soil area, the normal mud circulation rather than the reverse mud circulation can increase the roughness of hole wall and expand the diameter of pile hole to some extent, and it plays a role in increasing the bearing capacity of the piles.
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Keywords:
- pile foundation /
- cast-in-situ bored pile /
- mud /
- normal and reverse circulation /
- hole diameter
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