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1) 南京航空航天大學(xué)土木工程系，210016；  2) 東南大學(xué)土木工程學(xué)院橋隧與地下工程系
，南京，210096。
【提要】 廣西地區(qū)廣泛分布的第三系泥巖是典型的軟巖，一般作為建筑物樁基的持力層。為充分利用該層的承載力，往往在該地質(zhì)層進(jìn)行樁端擴(kuò)大。南寧市地王商會(huì)中心的樓層高、荷載大，其基礎(chǔ)采用了軟巖擴(kuò)底樁。其樁基試驗(yàn)采用自平衡試樁法，通過試驗(yàn)獲得了工程設(shè)計(jì)所需的重要參數(shù)，并進(jìn)一步認(rèn)識(shí)到浸水對(duì)軟巖擴(kuò)底樁的承載性能有較大的削弱，施工中應(yīng)對(duì)此采取有效措施。
【關(guān)鍵詞】 第三系泥巖 軟巖 擴(kuò)底樁 自平衡法
Research on Bearing Performance of Enlarged Toe Pile Embedded in Mudstone in Nan
ning/Cheng Ye1, Gong Weiming2, Ai Jun1, Dai Guoliang2 （1 Department of Civil
 Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2 College of Civil Engineering, Southeast University, Nanjing 210096,China）
Abstract:The tertiary mudstone distributing widely in Guangxi Province is the typical weak rock.It is usually chosen as the holding stratum of the building piles to make full use of its high bearing capacity. Enlarged toe piles embedded in weakrock foundation is adopted in Nanning Diwang Commerce Center for the height of the building is great and the load on it is large. The selfbalanced method is applied to the pile test of the highrise building. Key parameters required in design are obtained from the test. It is further realized that the bear
ing capacity of the enlarged toe pile embedded in weakrock will decrease when it is dunked. So effective measures should be adopted to avoid it.
Keywords:tertiary mudstone; weakrock; enlarged toe pile; selfbalanced method