土体疲劳对打桩分析的影响  

The Influence of Soil Fatigue on Pile Drivability

作　　者：刘润[1] 董伟[1] 禚瑞花[2] 闫澍旺[1] 樊之夏 冯韶辉[4] 

机构地区：[1]天津大学岩土工程研究所,天津300072 [2]解放军军事交通学院,天津300161 [3]中国海洋石油工程股份有限公司,天津300450 [4]中水北方勘测设计研究有限责任有限公司,天津300222

出　　处：《海洋技术》2005年第4期68-72,共5页Ocean Technology

基　　金：国家自然科学基金资助项目(50309009);国家高技术研究发展计划(863计划)资助项目(2004AA616100)

摘　　要：在动力沉桩过程中,桩长时间连续运动导致桩侧土体强度的降低,使土体产生疲劳效应。结合一维应力波动理论,桩—土相互作用模型和土体疲劳的不同计算方法,编制计算软件,对渤海某油田采油平台的桩基工程进行打桩分析,预测沉桩过程所需的锤击数、桩周土静阻力以及桩的极限承载力。比较不同的桩侧土体疲劳计算模式的分析结果,并用工程实测数据验证计算值。为工程设计和施工提供参考。During driving a pile, the soil around the pile will be disturbed by the repeated hammer loading, which cause the soil strength to decrease greatly. A program has been developed based on the one-dimension stress wave theory coupled with several soil fatigue models. The program has been used in ocean pile drivability analysis for a platform in Bohai area. This program can be used to predict the strike counts, static resistance of soil around pile, stress in the pile and the pile bearing capacity. Several soil fatigue models are introduced into the program and the results have been compared with the observed data. The model that can give better prediction results is recommended for engineering practice.

关 键 词：打桩分析 波动理论 土体疲劳 沉桩性状 

分 类 号：P753[交通运输工程—港口、海岸及近海工程]