渠坡上基桩的水平承载机制试验研究

南水北调中线工程建设中，交通桥和生产桥的支承结构大部分坐落在两侧渠坡上；运行期间的荷载（特别是水平荷载）通过桥墩和承台传到置于渠坡的桩基础上，在一定的深度范围内将产生桩、土分离及不均匀沉降，拉裂基础与渠坡结构层的结合，影响渠道的防渗效果。为了采取有效的防治措施，需要掌握渠坡斜面上基桩的变形机制。作为研究环节之一，通过物理模型试验研究了渠坡上基桩的水平承载机制，结果表明：基桩处在渠坡上的抗变形能力要比处在水平地基上的抗变形能力弱，水平承载能力比基桩处在水平地基上的要小。

Test sduty of horizontal bearing mechanism of pile on canal slope

In the construction of Middle Route of the South-to-North Water Transfer canal project, bearing structure of traffic bridge and connection bridge are mainly on the two side of canal slope. During the operation load expecially horizontal load will be transfered to the pile on the canal slope by the role of pier and cap, which can produce separation of pile and soil and cause uneven settlement in some deep range, on one hand can fracture the combine of foundation and layer structure of canal slope; and on the other hand affect the anti-seepage effect of canal slope. In order to take effective control measures, the deformation mechanism of pile on canal slope should be masterd. In this paper physical model test which is a link of research is designed to study the horizontal bearing mechanism of pile on canal slope; and the result shows that the anti-deformation performance of pile on canal slope is weaker than that of pile on horizontal subgrade; and horizontal bearing capacity of pile on canal slope is lower than that of pile on horizontal subgrade.