桩的抗压刚度结构  

A structural model for the compression stiffness of pile-soil systems

作　　者：李靖森[1] 王健[1] 杨宇[2] 

机构地区：[1]北京建筑工程学院,北京100044 [2]交通部公路科学研究院,北京100088

出　　处：《土木工程学报》2008年第11期99-105,共7页China Civil Engineering Journal

摘　　要：为得到计算受压桩的沉降、承载力并能分析压力在桩中传递规律的方法,对受压桩的物理现象进行研究。运用系统论中的结构方法,将桩和土作为桩-土受压系统,并建立该系统的抗压刚度结构,来揭示桩与桩侧土和桩底持力层三元素抗压功能之间的内在联系,揭示桩的抗压功能的构成方式,创造性地获得桩-土系统的"集成抗压刚度"数学模型,并且提出了受压桩简明、实用的计算方法。用试验数据进行计算,结果与实测相符。研究表明,建立的桩的抗压刚度结构,具有普遍性,符合客观规律,它的抗压功能,反映了抗压桩的功能;集成抗压刚度在概念上和理论方面,比目前采用的方法要完善得多。桩的抗压刚度结构的建立,是研究抗压桩机理的有效途径,它为桩基的设计计算,提供了新思路,搭设了新的研究平台。To obtain the method of calculating the settlement and bearing capacity of a pressure-bearing pile and analyzing the pressure transfer along a pile, the physical phenomenon of pressure-bearing piles was investigated. Using the structural method of systematic theory, a pile and its side soils were considered as a pile-soil pressure- bearing system, and an anti-compression stiffness structure was established to reveal the inner relations of the anti- compression functions between the three components, the pile, the side soils and the support layer at the tip of the pile. A mathematic model of integrated anti-compression stiffness for the pile-soil system was creatively obtained to bring the constitutive pattern of anti-compression function of a pile to light, and furthermore, a concise and practical calculation method for pressure-bearing piles was put foreword. The calculation results agree well with experimental data. The established anti-compression stiffness structure for the pile was universal and consistent with the anti-compression function of pressure-bearing piles. The integrated anti-compression stiffness method was more comprehensive, from both conceptual and theoretical aspects, than those so far adopted methods. The anti- compression stiffness structure for pressure-bearing piles provides an effective approach to studying the anti- compression mechanism, as a new train of thought and a new platform for design and calculation of pile foundations.

关 键 词：受压桩 沉降 承载力 桩-土系统 抗压刚度结构 集成刚度 

分 类 号：TU473.1[建筑科学—结构工程]