针对静载荷试验无法得到大直径桩基极限承载力的问题 ,分析了桩在静载荷作用下的工作性状及 2 0余根大直径人工挖孔桩的静载荷试验资料 .指出了现有几种荷载、时间、沉降关系曲线的局限性 ,提出了对大直径挖孔桩荷载—沉降曲线按双曲线拟合的逆斜率法 .结果表明 :逆斜率法能较好地预测单桩极限承载力 .同时 ,提出了利用工程桩作压载试验确定桩承载力的有关建议 Aiming at the problem that the ultimate bearing capacity of large-diameter pile foundation can not be obtained in static load test, the working behavior of pile under static load and the static load test data of more than 20 large-diameter artificial hole-digging piles are analyzed. Load, time and subsidence curve, a hyperbolic fitting inverse slope method is proposed for the load-settlement curve of large diameter digging pile.The results show that the inverse slope method can predict the ultimate bearing capacity of single pile well. At the same time, some suggestions are put forward to determine the bearing capacity of piles using engineering pile as ballast test