土与结构接触面试验中的土颗粒细观运动测量

Measurement of soil particle movement in soil-structure interface test

建立了包括设备、算法及软件的细观测量系统以用于测量土与结构接触面试验中土颗粒的运动。基于图像相关分析理论提出了一种新的补零相关分析算法以确定不同数字图像上的相关标记点,其测量精度可达亚像素量级。建立了跟踪并测量土颗粒运动的细观测量算法,编制了相应软件,实现了分析过程的程序化和自动化。对粗粒土与结构接触面剪切试验过程中的土颗粒运动进行了测量,初步证明了该技术的实用性。测量结果表明结构面附近的土颗粒由于结构面影响出现较大的变位,这种变位随着离结构面距离的增加而减小。

A microscopic measurement system including device, algorithm and software was presented to observe and measure the particle movement in soils during soil-structure interface test. A zero-padding algorithm based on correlation-based image analysis theory with the accuracy of sub-pixel class was presented to determine the benchmarks in different digital images. A particle-tracking method as well as its program, which was fully computerized, was therefore developed to track soil particles with simultaneous measurement of their translation and rotation. The method was used to measure the soil particle movement in practical soil-structure interface test, which preliminarily confirmed that the method was valid in reasonable calculation of soil particle movement with the present microscopic measure system. The test results show that the significant particle motions concentrate in the soils near the structure, which will decrease obviously with the increase of the distance away from the structure.