阵列式位移计在动力测试中的应用

Application of Shape Acceleration Array in Dynamic Test

摘要:

阵列式位移计（SAA）是一种基于微电子机械系统测试原理测试加速度和位移的传感器，具有精度高、可重复利用、自动实时采集等特点。该仪器装置可满足静态下岩土工程的变形测试要求，如边坡滑移、隧道、路基沉降、桥梁挠度等变形监测，也适用于动态下的加速度、位移、温度的测试。国内首次将阵列位移计（SAA）应用在大型振动台试验中，对桩基和刚性复合地基以及地基土在地震动作用下加速度和位移等动力响应进行研究。表明加速度动力系数在砂层中放大，软土中减小。随着输入地震动峰值的增大，地基土中不同深度测点的峰值加速度动力系数均有所降低，说明在累加地震作用下土体传递地震波的能力减弱。

Abstract:

Shape Acceleration Array （SAA） is a sensor based on the microelectromechanical systems （MEMS） testing principle used to test acceleration and displacement with high accuracy，reusability，and automatic real-time acquisition.The instrument device can meet the deformation testing requirements of static geotechnical engineering such as sliding slope，tunnel，embankment settlement，and deflection and deformation monitoring of bridges and is also used for testing of dynamic acceleration，displacement，and temperature.This study is the first domestically to use SAA in a large-scale shaking table test.Moreover，acceleration，displacement，and other dynamic responses of pile，rigid composite foundation，and soil are studied relative to ground motion.The results show that the acceleration dynamic coefficient increases in sand and decreases in soft soil.As the input seismic peak increases，the peak acceleration dynamic coefficient of measuring points at various depths is reduced，which indicates that in the cumulative effect of the earthquake，the ability of the soil to pass seismic waves is weakened.