边坡桩基受力特性的离心模型试验

Centrifugal model test on mechanic features of pile foundation at slope

鉴于采用常规试验方法对临空面的边坡桩基较难进行分析,利用基于相似理论的土工离心试验机,通过缩小原型尺寸的方式对其进行研究。在土工离心试验中,采用自制的加载系统分别对端承桩与摩擦桩这2种不同形式的桩基施加水平荷载和竖向荷载,给出边坡桩基受力性能的研究方法,并进行了受力机理分析。试验结果表明:边坡桩基受较小的水平荷载时,2种桩基形式受力性能相差不大;摩擦桩在承受竖向荷载时承载性能较差,对桩周土体扰动较大,不宜作为边坡桩基的形式。

It is very difficult to study the pile foundation in slope by the traditional method because there exists free surface in it. By employing the geotechnical centrifuge based on the theory of similarity, the pile foundation is studied by reducing the dimensions of the centrifugal tests, the horizontal and vertical loads are exerted on end-bearing pi prototype. In the le and friction pile respectively by the loading devices developed by the authors. The research methods and mechanic mechanism are presented. The test results indicate that the differences between the mechanic features of two pile foundations are little. The friction pile is not proper to be used as pile foundation in slope because of the poor performance when it is subjected to the vertical loads and it can bring a large perturbation for the soil around the pile. 1 tab, 14 figs, 13 refs.