以三维有效应力法分析群桩动态试验研究

Numerical study for dynamic responses of pile foundation in shake table tests using a three dimensional effective stress analysis

1995年Kobe地震产生大规模液化,造成许多桩基础建筑物、货柜和桥墩破坏;尤其在液化土壤发生侧溃的地区,桩基损害最为严重。所探讨的试验模型为日本筑波的公共工程研究所中心所做之试验,其探讨位于港口之群桩基础在液化土壤发生侧溃下之反应。群桩基础所坐落处为液化回填层,护岸为钢版桩组成。地震波为正弦Sin波500gal。主要以三维有效应力法分析,该系列群桩基础在土壤液化引起之地盘流动下的反应。另配合土层变化进一步延伸探讨群桩基础于三层土剖面中改变桩帽设置于不同高度、置换不同松砂强度于松砂层及桩长改变各情况下之动态反应。

In 1995, Kobe earthquake resulting in large-scale liquefaction caused obvious damage to pile foundations of buildings, containers and piers. The most serious damage area to piles is in the liquefied soils with lateral spreading. The model tests are conducted in the Center of Public Works Research Institute in Tsukuba, Japan. The responses for a pile foundation in lateral spreading at a port are studied. The pile foundation is located in liquefied-backfill layer where sheet piles are employed for revetment work. The main purpose is to conduct a three-dimensional effective stress analysis to examine the responses of the pile foundation in a lateral spreading due to soil liquefaction. In addition, this study also investigates the dynamic responses of the pile foundation to several configuration changes.