摘要
由于饱和土中孔隙水的流动特性以及桩基与土体的不同渗透率,饱和土与单相土中桩基的力学行为,尤其是动力学行为存在很大差异。将土体视为两相多孔介质,运用多孔介质理论表现土体的宏观力学性能,通过引入势函数和利用分离变量的方法,研究分析饱和土中桩基的纵向耦合振动问题,在此基础上,研究物性参数对饱和土-桩耦合体系动力学行为的影响。研究表明:长径比、桩土模量比对饱和土中桩的纵向振动有较大的影响,而土体黏滞阻尼系数和液固耦合系数也有一定的影响,但影响相对较小。
Because of the flow characteristics of pore water in saturated soils and the difference of porosities between pile and soil, the mechanical properties and especially the dynamic behaviors of piles in saturated soils are greatly different from those of piles in dry soils. Based on porous medium theory, the vertical coupled vibration of a pile in a saturated soil is investigated, with the introduction of the potential functions and the method of separation of variables. The soil is regard as a porous medium filled with water, and the mechanical properties of the soil are determined using the theory of porous medium. The influences of the material parameters on the dynamical behaviors of a saturated soil-pile system are examined numerically. It is shown that length-diameter ratio and modulus ratio have a great influence on the vertical vibration of the pile in saturated soil, while the influences of soil damping and coupled coefficient are smaller.
出处
《土木工程学报》
EI
CSCD
北大核心
2009年第9期89-95,共7页
China Civil Engineering Journal
基金
国家自然科学基金(10872124/A020601)
上海市自然科学基金(06ZR14037)
上海市重点学科建设项目(Y0103)
关键词
多孔介质
饱和土
纵向振动
耦合系数
长径比
porous medium
saturated soil
longitudinal vibration
coupled coefficient
length-diameter ratio
