海洋石油平台超长桩拒锤分析及工程实例

发布时间：2018-02-25 15:19

  本文关键词： 超长桩 拒锤 超静孔隙水压力 水力劈裂 可打入性分析方法　出处：《岩土力学》2015年S2期 　论文类型：期刊论文

【摘要】：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β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。
[Abstract]:Pile foundation is a common foundation form of offshore oil platform. Limited by marine environment, it is usually manufactured in sections, transported and hammered in, each pile section is connected as a whole by welding, and if the pile is connected, the hammer stop time is longer. During the piling process, the soil around the pile accumulates a very large excess pore water pressure, which causes hydraulic fracturing in the soil around the pile, which results in the acceleration of the drainage consolidation and strength recovery of the soil around the pile. The longer the hammer stop time, the greater the recovery degree of soil strength, which leads to the difficulty of subsequent piling and even refusing hammer. This paper proposes a method to consider the recovery of soil strength during hammer stopping by fatigue factor 尾. The method of calculating the number of hammering and judging the risk of rejection hammer by using GRLWEAP software is used to calculate the number of hammering and to judge the risk of rejection hammer. By comparing the engineering examples with the measured results, the method is used to calculate the number of penetration hammers and the measured values are close to each other. It shows that it is feasible and applicable, and can provide guidance for engineering design and construction.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学建筑工程学院;
【基金】：国家自然科学基金(No.51322904,No.51279127,No.41402263) 天津市重点项目基金(No.13JCZDJC35300) 教育部新教师基金项目(No.20130032120053)
【分类号】：TU473.1

【参考文献】

中国期刊全文数据库 前7条

1 闫澍旺;周群华;刘润;董伟;;Pit Bearing Capacity Effect on Status of Soil Plug During Pile Driving in Ocean Engineering[J];China Ocean Engineering;2011年02期

2 韩亮;姚爱军;郭萍;韩军伟;;深海水下导管架钢管桩可打性实例分析[J];地下空间与工程学报;2014年S2期

3 闫澍旺;张锡治;刘润;;海洋石油平台桩基拒锤现象[J];天津大学学报;2007年11期

4 刘润;闫s，

本文编号：1534073