桩基础是海洋石油平台常用的基础形式，受海上环境的限制通常分段制造、运输和锤击贯入，各桩段通过焊接连为整体，若接桩等造成停锤时间较长，后继打桩可能产生拒锤现象。打桩过程中桩周土体会积累很大的超静孔隙水压力，使桩周一定范围内土体发生水力劈裂现象，导致桩周土体排水固结及强度恢复速度加快，停锤时间越长，土体强度恢复程度越大，造成后继打桩困难甚至拒锤。提出了一种通过疲劳因子? 考虑停锤期间土体强度的恢复，利用GRLWEAP软件计算后继打桩贯入所需锤击数并判断拒锤风险的分析方法。将工程实例和实测结果进行了对比，文中方法计算得到后继打桩贯入锤击数和实测值接近，表明其可行且应用性较强，可为工程设计和施工提供指导。

The long piles of the ocean oil platform are usually manufactured as the integration of several segments which have to be assembled one by one during installation. During pile driving, excessive pore pressure will build up in such a high level that hydraulic fracturing in the soil round the pile may take place, which will cause the soil to consolidate much faster during pile extension period. Consequently, after pile extension, the soil strength will recover to some extent and the driving resistance will increase considerably, which makes restarting driving the pile very difficult and even cause refusal. A drivability analysis method for judging the risk of refusal by estimating the blow counts after pile extension is proposed, penetration GRLWEAP software is used to calculate the subsequent piling hammer the required number of hammer, in which the regain of soil strength is considered via the fatigue factor β. A case study is made using the proposed method, so as to prove the feasibility and applicability of the method.