作　　者： ; ; ;

机构地区： 湖南工业大学土木工程学院岩土工程研究所

出　　处： 《株洲工学院学报》 2006年第4期90-93,96,共5页

摘　　要： 通过室内模型静载实验,研究和分析了不同荷载下的膨胀土地基中桩的荷载传递特点、桩侧摩阻力和桩端阻力的变化以及二者的荷载分担比例关系等。试验表明:膨胀土中桩的静载试验所得到的P-s曲线存在明显的拐点;桩身轴力随桩顶荷载的增加在桩身中部以上迅速递减,且桩身轴力增加与桩顶荷载增加几乎呈线性关系,桩中部以下几乎变化很小;该模型桩的荷载传递是以侧摩阻力为主的;桩侧摩阻力和桩端阻力均随桩顶荷载的增加也呈近似线性关系,但桩侧摩阻力和端阻力在荷载分担比方面存在一个极值。 A model test for a pile in expansive soil is carried out to study and analyze load-transferring characteristics, including the behavior of skin friction and pile-end resistance together with load distribution of both. The test shows a clear turning point occurs in a P-s curve; the axial force above the middle of the pile decreases dramatically and the increment of the axial force is linear with the increment of the applied load,but changes of axial force below the middle of the pile are very small; and the load transferring behavior of the model pile mainly relies on the literal friction resistance. Both the skin friction and the pile-end resistance increase nearly linearly with the increase of the applied loads at the pile-top. As for the bearing ratio in pile side friction and pile-end resistance,an ultimate value may be found.

关 键 词： 膨胀土 模型试验 荷载传递 荷载分担比

领　　域： [建筑科学] [建筑科学]