用试桩值反演分析不同土体预应力砼管桩参数

Inversion Analysis of the Pre-stressed Concrete Pipe Pile Parameters through Pile Testing Data

通过3个场地试桩资料反演分析,取得不同土体管桩参数选取原则与方法初步成果:砂性土侧阻力、端阻力可据实测标贯击数加5击后的密实度按桩基规范选取,且具有桩端进入持力层越深端阻力越大的特点,甚至可将砾砂的端阻力提高到卵石挡选取;上更新统粘性土侧阻力、端阻力亦可据实测液性指数提高一挡或半挡按桩基规范选取;全新统粘性土、上更新统粉土侧阻力可据实测液化指数或密实度直接按桩基规范选取。

Through inversion analysis of pile testing data at three sites, the author has concluded as follows. The lateral and tip resistance of sandy soil can be determined according to the code by the density, after adding 5 strikes to the standard penetration test, and the tip resistance becomes higher as the pile gets deeper into the supporting course. As for the upper Pleistocene cohesive soil, the lateral and tip resistance can be determined according to the code after raising the liquidity index by one or half a level. In addition, the lateral resistance of the Holocene cohesive soil and the upper Pleistocene silt can be determined according to the code directly based on the origin liquidity index of density.