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海洋石油平台大直径超长桩贯入过程中会出现两种极端现象,即拒锤与溜桩。本文总结了打桩过程中不同型式桩的贯入特性,针对出现拒锤和溜桩现象的基桩的可打入性特性进行分析研究,提出以下措施:对于基桩连续贯入条件下的模拟计算,提出连续可打入性分析的重点是砂土和粘性土的不同疲劳效应;针对拒锤现象,结合实际工程对拒锤发生机理进行了研究,根据海上高应变复打试验得到桩周土强度随时间变化的规律公式,提出Restart的计算模拟方法;针对溜桩现象,结合实际工程对溜桩的过程和发生机理进行了探讨,提出了在溜桩状态下土阻力的计算方法,在此基础上,建立了判断溜桩范围的分析计算方法;利用CAPWAP软件针对海洋平台桩基工程沉桩过程中的极端现象进行了分析计算,验证了所提出的方法的合理性,可供桩基设计以及沉桩施工参考。
Offshore oil platform large diameter piles into the process there will be two extreme phenomena, namely, rejection hammer and slippery pile. This paper summarizes the penetration characteristics of different types of piles during piling, analyzes the drivability of piles with refuse hammering and slip-piling phenomenon, and puts forward the following measures: For the simulation calculation of continuous penetration of piles , And puts forward that the analysis of continuous drivability focuses on the different fatigue effects of sand and clayey soils. According to the refuse hammering phenomenon, the mechanism of refuse hammering is studied in combination with practical engineering. According to the test of high strain rewinding at sea, According to the regular formula of time-varying, the method of Restart calculation and simulation is put forward. In view of the phenomenon of slippery pile and the actual project, the process and mechanism of slippery pile are discussed. The calculation method of soil resistance under slippery pile is put forward. , An analysis and calculation method for judging the sliding pile range was established. The CAPWAP software was used to analyze and calculate the extreme phenomena during pile sinking of offshore platform pile foundations, which validated the rationality of the proposed method, Pile driving construction reference.