饱和砂土中桩基的振动台试验  

Shake Table Test on Pile Foundation in Saturated Sand

作　　者：冯士伦[1] 王建华[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《天津大学学报》2006年第8期951-956,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家"863"计划资助项目(2002AA615080);国家自然科学基金(50579050);天津大学青年教师基金(5110101).

摘　　要：确定地震荷栽作用下液化土层中桩的p-y特征参数,是客观评价此时桩水平承载特性的关键．通过饱和砂土中桩基的大型振动台试验,获得了不同相对密度砂层液化时的桩身弯矩和桩顶重物的加速度．根据试验结果,提出利用对静力p-y(p为相互作用力,y为相对位移)曲线进行折减,得到液化砂土中桩的水平承载特性的方法,进而应用非线性文克尔地基梁模型,计算了砂土液化时的桩身弯矩．若砂土的相对密度为20%～40%时,把静力p-y曲线折减为原来的0．1,作为液化砂土的p-y曲线．数值计算的桩身弯矩与试验结果比较一致．The bending moments along the model pile and the acceleration of the mass at the top of the model pile were obtained at the onset of liquefaction of sand with different relative densities by shake table test. Based on the test results, it is proposed that the static p-y （p is the soil-pile interaction resistance, and y is the relative displacement between the pile shaft and soil）curves of the pile should be scaled to determine the lateral bearing behavior of the pile in liquefied sand. And the bending moments of the model pile at the onset of liquefaction were further calculated using the model of the beam on nonlinear Winkler foundation. The calculated results of the bending moments of the model pile are consistent with the test results when the relative density of the sand is between 20%-40% and the static p-y curves scaled as 0.1 are used as the p-y curves for liquefied sand.

关 键 词：砂土液化 桩 P-Y曲线 振动台试验 

分 类 号：TU441[建筑科学—岩土工程]