大直径挖孔灌注桩基承载力研究

On the Bearing Capacity of Large-Diameter Bored Piles

针对桩与墩的作用机理和承载力分析等问题。通过室内模型试验,得出桩与墩工作机理不同。计算它们的承载力方法也不应相同的观点。从二十多根现场试桩资料的统计分析表明:桩基持力层的承载力与动探击数有关。即与持力层介质的密实度和颗粒组成密切相关。与其它因素相关不密切。并在理论上论证了这一观点。

The working principle and bearing capacity are studied for both piles and piers to compare them. Through model tests.a conclusion is drawn that working principles between piles and piers hence their calculating methods of bearing capacity are different. According to the statistic data from bearing tests in situ.including 27 piles, the value of bearing capacity of pile's foundation/soil closely relates to its SPT blow count (N).i. e. its density and granular constituent.but scarcely to its buried depth and granular size and bears no relation to the bell diameter of piles. This point of view is also justified theoretically.