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[提要]  通過對(duì)同一場(chǎng)地7根大直徑鉆孔灌注嵌巖樁和非嵌巖樁的靜載對(duì)比試驗(yàn)及在部分樁身埋設(shè)應(yīng)力計(jì)，分析比較了它們的承載能力和荷載傳遞特性。對(duì)有深厚上覆土層的大直徑鉆孔灌注樁是否設(shè)計(jì)成嵌巖樁和何時(shí)設(shè)計(jì)成嵌巖樁及其適宜的嵌巖深度提出了建議。同時(shí)指出，大直徑鉆孔灌注樁承載力存在臨界深度。
[關(guān)鍵詞]  大直徑 鉆孔灌注柱  嵌巖樁 承載能力  比較分析 靜載試驗(yàn)

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