离心机振动台试验中侧向流动地基位移分析方法研究  

Analysis method for lateral spreading ground displacement in centrifuge shaking table tests

作　　者：王睿[1,2] 张建民[1,2] 张嘎[1,2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]清华大学岩土工程研究所,北京100084

出　　处：《世界地震工程》2010年第S1期225-229,共5页World Earthquake Engineering

基　　金：国家自然科学基金项目(51079074)

摘　　要：通过分析倾斜可液化地基的离心机振动台试验,对离心机振动台试验中地基土体位移分析方法进行了研究,得到了能够有效测量和计算可液化地基地震过程中和震后侧向流动的位移的方法。这种分析方法能够通过对加速度数据的处理和计算,有效地克服位移传感器在地震过程中反应不够灵敏导致的位移过程测量的误差,得到合理的地震过程中地基位移变化;同时利用位移传感器对低频位移测量准确的优势,通过量测的震后侧向位移值对计算位移值进行修正,可以得到地震结束后,地基的最终变形。本研究为土工离心机振动台试验中侧向流动地基的位移测量和分析提供可靠有效的方法,也能够为进一步的可液化地基离心模型试验的土体位移相关研究分析提供必要基础。Through analyzing a dynamic centrifuge model test for single pile foundation in sloping liquefiable ground,effective calculation and measurement of soil displacement are explored under an earthquake and during lateral spreading after strong earthquakes.The developed method can overcome the inaccuracy of displacement sensors in centrifuge model tests under strong earthquakes.Through processing and integration of measured acceleration data,soil displacement processing under earthquakes can be calculated.Using the advantages of displacement sensors for measuring low frequency displacements,the measured post-earthquake lateral spreading is added to the calculated displacement to acquire the final displacement in the soil.This research provides an effective method for the displacement analysis of soil in dynamic centrifuge tests,and will provide basis for further investigation into the displacement of lateral spreading ground under earthquakes.

关 键 词：离心机振动台 可液化地基 位移 滤波 

分 类 号：TU435[建筑科学—岩土工程]