[提要]  通过对同一场地7根大直径钻孔灌注嵌岩桩和非嵌岩桩的静载对比试验及在部分桩身埋设应力计，分析比较了它们的承载能力和荷载传递特性。对有深厚上覆土层的大直径钻孔灌注桩是否设计成嵌岩桩和何时设计成嵌岩桩及其适宜的嵌岩深度提出了建议。同时指出，大直径钻孔灌注桩承载力存在临界深度。
[关键词]  大直径 钻孔灌注柱  嵌岩桩 承载能力  比较分析 静载试验

On basis of comparative load tests of 7 large diameter bored socket and non-socket piles (2 instrumented piles), the bearing capacities and load transferring properties are compared. it is proposed when and whether large diameter bored pile loacated in thick overburden layer should be designed as socket piles and what the proper socket depth is. Moreover, the author points out that the large diameter bored pile has critical length.
Keywords: large diameter; bored socket piles; non一socket piles; bearing capacity; comparative study