软土中预制桩承载力时间效应三参数模型  

THREE-PARAMETER MODEL FOR TIME-DEPENDENT BEARING CAPACITY OF PREFORMED PILE IN SOFT SOIL

作　　者：杨丽君[1] 王伟[1] 宰金珉[2] 

机构地区：[1]绍兴文理学院土木工程系,绍兴312000 [2]南京工业大学土木工程学院,南京210009

出　　处：《工业建筑》2008年第6期54-57,共4页Industrial Construction

基　　金：浙江省教育厅科研资助项目(20061161);国家自然科学基金资助项目(40672183)

摘　　要：预制桩承载力的时间效应是岩土工程中一个非常重要且尚未很好解决的问题。在承载力初始增长速率和承载力最大增量的基础上,引入承载力增长半衰期的概念,揭示双曲线模型的数学缺陷。根据机理分析和能量耗散假定,在建立承载力时间效应控制微分方程的基础上,推导出预制桩承载力时间效应的三参数模型。分析表明:该模型可克服双曲线模型的缺陷,双曲线模型及其承载力增长半衰期均是三参数模型对应的特例。最后,通过对两个工程实例的拟合与实测对比进一步验证新模型的正确性。The time effect process of bearing capacity of preformed pile is an important and unsolved geotechnical subject. Based on the initial increasing rate and the maximum increment of bearing capacity, half time of bearing capacity process is defined and employed to study the time effect model. Shortcoming of hyperbolic model is validated in terms of it. According to mechanical analysis and some energy dissipating postulates, the governing differential equation for bearing capacity increasing process is developed, and a 3-parameter model for this process is established. Mathematical analysis shows that the hyperbolic model and its half-value time are corresponding degraded expressions of the established 3-parameter model, respectively. The 3-parameter model overcomes the shortcoming of hyperbolic model. Finally, good agreements have been found between simulated results of the proposed model and two field tests.

关 键 词：预制桩 极限承载力 时间效应 能量耗散 微分方程 

分 类 号：TU473.1[建筑科学—结构工程]