砂土地层中沉渣对旋挖桩承载力的影响

Sediment Influence on the Bearing Capacity of Swivel-driven Pile in the Sandy Soil Strata

由于摩擦型灌注桩承载变形机理较为复杂,影响其承载力的因素很多,其中沉渣对承载力的影响非常明显。旋挖灌注桩与其它形式的钻孔灌注桩相比,在控制沉渣方面具有一定的优势,但在较厚的砂土层中,采用泥浆护壁清孔往往造成单桩承载力的降低。根据试桩的结果,客观分析了旋挖桩在砂土层中的使用效果,以及沉渣对承载力的影响,旨在为旋挖桩在工程中的应用积累一些有益的经验。

There are many factors relate to the bearing capacity of piles because of the complex bearing-deformation mechanism, in which sediments have evident influence on the bearing capacity. Comparing with other cast-ln-place piles, although the swivel-driven pile possesses special advantage in controlling sediments, the method of adopting the slurry to clean bore usually decrease the bearing capacity of pile in the sandy strata with large thickness. Based on the result of trial piles, the applied effect of swivel-driven pile in the sandy soil and the influence of the bearing capacity due to sediments are objectively analyzed. Useful experience for the application of the swivel-driven pile in the project is offered.