施  峰     （福建省建筑科学研究院  福州 350025）

[提要]  通过对11根大直径超长钻孔桩（其中9根桩身埋设有测试元件）的静荷载试验，对大直径超长桩受最大荷载为24MN时的受力特性和荷载传递机理及侧阻力、端阻力的变化规律进行研究，分析了施工工艺、嵌岩深度、桩端高压注浆等因素对大直径超长桩承载力的影响。介绍了重载试验的特点和难点，给出桩周土层的分层极限侧阻力和极限桩端阻力，可为相同地质条件的桩基设计提供可靠的依据。
[关键词]  大直径钻孔灌注桩  超长  荷载传递  现场试验  承载力

The mechanism of load transmission and variation law of lateral resistance ancl tip resistance of super long large diameter bored piles are studied through eleven field tests. The affecting factors of rock socket depth, pile end groutlng, construction technique are analyzed. The difficult point of high capacity static load tests is solvecI.The range of lateral resistance values of soil layers is presented.
Keywords: large diameter bored pile; super long; load transmission; field test; bearing capacity