摘要
在国内外岩土模型动力试验中,一般以图表形式对监测区域进行逐一动态分析,无法直观形象的掌握试验模型整体受力变形,为深入分析动态响应机理带来一定的不便。以前-后排抗滑桩加固斜坡桥基的大型振动台模型试验为例,通过在岩土体中埋设一定数量的自制磷青铜带和水平加速度计,监测滑坡变形和加速度响应,结合已知测点的水平坐标和竖向坐标,利用Renka Cline随机矩阵生成方法转换为数字矩阵形式,据此绘制坡体变形及PGA放大系数的二维等势图。试验结果显示,二维等势图能合理反映斜坡PGA放大系数的变化规律,揭示振动波作用下斜坡变形破坏的基本特征,研究结论和试验现象保持一致,满足斜坡模型整体受力变形分析的基本要求,可以作为一种实用的试验分析方法。
For the dynamic tests of geotechnical model at home or abroad,the monitoring areas are commonly analyzed step by step with the form of charts,it is difficult to study the force and deformation characteristics of the whole test model directly,which brings some inconvenience for the in-depth analysis of the dynamic response mechanism.In this paper,the large-scale shaking table model test of bridge pile foundation reinforced with the front and rear stabilizing piles on gravel slope was taken as an example,the slope deformation and acceleration response were monitored by embedding some phosphor bronze strips and horizontal accelerometers.Combined with the known horizontal and vertical coordinates of the measuring points,the digital matrix was generated by applying the Renka Cline random matrix method,and the two-dimensional contour plots of slope deformation and PGA amplification factor were drawn.The results showed that the two-dimensional contour plots reflected the change rules of PGA am plification factor reasonably,the characteristics of slope failure mechanism under seismic wave loading were suggested,and the research conclusion was consistent with the test phenomenon.The two-dimensional contour plots met the essential requirements of the slope forced deformation analysis,it could be applied as a practical analysis method.
作者
邹祖银
雷达
蒋关鲁
罗斌
孙诗伟
赵伟豪
王太达
ZOU Zuyin;LEI Da;JIANG Guanlu;LUO Bin;SUN Shiwei;ZHAO Weihao;WANG Taida(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Engineering,Sichuan Agricultural University,Dujiangyan 611830,China;Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction,Dujiangyan 611830,China)
出处
《世界地震工程》
CSCD
北大核心
2020年第4期185-192,共8页
World Earthquake Engineering
基金
铁道部科技研究开发计划重大课题(Z2012-061)。
关键词
岩土模型
动力试验
磷青铜带
水平加速度计
二维等势图
geotechnical model
dynamic test
phosphor bronze strip
horizontal accelerometer
two-dimensional contour plot
