摘要
负摩阻力问题广泛存在于桩基工程中,深入探讨其分布规律及计算方法,具有重要的理论与工程实际意义。笔者首先讨论了基桩负摩阻力的产生机理及其主要影响因素,对佐藤梧双折线模型进行了改进,以荷载传递法建立出基桩负摩阻力的基本微分方程。在此基础上,考虑桩-土相互作用及土体的分层特性,导出了适合于任意土体沉降曲线的基桩负摩阻力分段解析解。进而引入土体沉降的 Boussinesq 解,结合文中解答对某工程实例进行了分析。其结果表明,该方法能较准确地描述桩身负摩阻力的传递过程,且计算方法简便,参数易于获取,具有通用性,是一种可行的基桩负摩阻力分析方法。
As it has long been recognized that, negative skin friction resistance most possibly exists on piles when the soil around pile move downward relative to the pile, so to determine the distribution rule and find that appropriate calculation methods of negative skin friction resistance are of important theoretical and practical significance in engineering. The forming mechanism and primary influential factors of negative skin friction resistance were first discussed. Then, based on the load transfer method and improved Kezdi's double-broken-line model, the differential equation of negative skin friction resistance along the pile shaft was established, and considering the character of layered stratum, a piecewise analytical solution which was suitable for any kind of soil settlement curve was obtained. Lastly, an engineering example was analyzed by the method in combination with the Boussinesq solution. The calculated results agree well with the field measured data. Furthermore, the method proposed can accurately describes the transferring process of negative skin friction resistance on pile and the relative parameters can be easily obtained, which is also simple to calculate and feasible to analyze the negative skin friction resistance in engineering.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2004年第9期1442-1446,共5页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(编号:50378036)
