1) 南京航空航天大学土木工程系，210016；  2) 东南大学土木工程学院桥隧与地下工程系
，南京，210096。
【提要】 广西地区广泛分布的第三系泥岩是典型的软岩，一般作为建筑物桩基的持力层。为充分利用该层的承载力，往往在该地质层进行桩端扩大。南宁市地王商会中心的楼层高、荷载大，其基础采用了软岩扩底桩。其桩基试验采用自平衡试桩法，通过试验获得了工程设计所需的重要参数，并进一步认识到浸水对软岩扩底桩的承载性能有较大的削弱，施工中应对此采取有效措施。
【关键词】 第三系泥岩 软岩 扩底桩 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