土质边坡建筑桩基水平荷载试验研究

结合工程实际，在土质边坡进行桩基水平荷载试验，研究在水平力作用下的桩体变形特征及承载力。试验结果表明：（1)由位移控制的该工程下部结构设计是安全的；(2)试桩因离土质边坡坡脚距离不同而力学响应有明显的不同，在水平位移一定的条件下，离坡脚愈近，水平承载力愈大，这表明了在坡内土体竖向分力作用下，桩体本身受到较大的球应力作用，整体抵抗能力提高；(3)对于土质边坡建筑桩基础，桩体的承载能力与荷载施加方向是否和坡向一致未见有明显关系，显示了土质边坡均匀性特点，这与岩质边坡地质结构有明显的方向性有很大的不同。

IN-SITU TESTING STUDY ON PILE FOUNDATION IN SOIL SLOPE UNDER HORIZONTAL LOADINGS

In-situ horizontal loading tests of pile foundation for an eleven-storey building on a soil slope are carried out. Combining testing results with the physical and mechanical properties of the slope soil, and the parameters of piles, it can be concluded that (1) the foundation structure design controlled by displacement consideration for the building is safe,(2) the mechanical response of piles obviously changes with the variance of distance from a pile to the soil slope to some extents, and when the horizontal displacement of pile is known, the shorter the distance is,the greater the horizontal bearing capacity of a pile is,which reflects the fact that the piles closer to a soil slope are under the greater three-dimensional static pressures,and (3) the bearing capacity of a pile is not related to the relation between loading direction and the slope inclination direction. This means that the soil slope is of homogeneous property,which is different from rock slope with strong directional influence due to geological structures of rock mass.