计入时效的桥台基桩负摩阻力解析计算方法研究  

Study of Analytical Method to Caculating Negative Skin Friction on Abutment Pile with Taking into Account Time Effect

作　　者：贺炜[1] 王泓华[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410076

出　　处：《公路交通科技》2009年第6期40-44,共5页Journal of Highway and Transportation Research and Development

基　　金：长沙理工大学人才引进基金资助项目(1004178)

摘　　要：桥台地基土在填土荷载作用下产生的固结沉降,常引起基桩负摩阻力问题,深入研究其发展规律及计算方法十分必要。首先探讨了基桩负摩阻力特性及桩土相对位移计算方法,结合桥台工程特点,选用一维固结理论模拟桥台填土过程对地基土沉降量的影响。在此基础上,考虑桩土相互作用及土体的分层特性,基于荷载传递法导得基桩负摩阻力分段解析解,以此建立出可考虑时效的基桩负摩阻力计算方法。最后,结合某工程实例进行了计算分析,结果表明,该方法可较好描述地基土沉降发展过程及桩身荷载传递性状。Negative skin friction is regularly caused by settlement of consolidating surrounding soil on the site of bridge abutment, so it is quite necessary to study the developing regularity and calculating method of negative skin of pile. First, the characteristic of negative skin friction and calculating method of relative displacement between pile and soil were discussed. Second, the feature of construction procedure of abutment was considered and the one dimension consolidation theory was introduced to simulate the settlement of subsoil during construction process of abutment backfill. Then, based on the load transfer method, the piecewise analytical solutions of negative skin friction of piles, were obtained with consideration of the pile-soil interaction and the character of layered stratum, and the calculating method for the time effect of negative skin friction was established. Lastly, an engineering example was analyzed by the presented method. The result indicates that the developing of soil settlement and load transfer behavior of pile could be described well with this method.

关 键 词：桥梁工程 桩基础 负摩擦阻力 荷载传递法 一维固结理论 桩土相互作用 

分 类 号：TU473[建筑科学—结构工程] U443.15[建筑科学—土工工程]