三轴试样变形数字图像测量误差和精度分析  

Errors and accuracy analyses of digital image processing technique for measuring specimen deformation in triaxial test

作　　者：王助贫[1] 邵龙潭[2] 刘永禄[3] 韩国城[1] 

机构地区：[1]大连理工大学土木工程系,辽宁大连116024 [2]大连理工大学工程力学系,辽宁大连116024 [3]大连理工大学物理系,辽宁大连116024

出　　处：《大连理工大学学报》2002年第1期98-103,共6页Journal of Dalian University of Technology

基　　金：教育部高等学校骨干教师资助计划资助项目 [教技司 ( 2 0 0 0 ) 6 5号 ]

摘　　要：计算机数字图像识别技术为三轴试验土样变形测量提供了一种简单并且有效的测量方法 ,它不仅可以克服常规测试方法存在的诸多缺陷 ,而且具有相对较高的测试精度 .比较详细地分析了土样变形数字图像测量系统的各种可能误差源 ,讨论了各种误差的影响并提出相应的消除和减小误差的办法 .实际测试检定表明 ,数字图像测量系统在三轴试样变形测量中的应变测量精度为 1 0 - 4 ,高于常规测量方法的测试精度 ,能够满足土样变形高精度测量的要求 .Digital image processing technique for measuring the specimen deformation in triaxial test is a simple and convenient method. It has high accuracy and can get over many shortages encountered in traditional triaxial test. All types of error sources and their influences existing in the presented technique are discussed in detail, and the means to reduce or get rid of the errors are suggested. By comparing the measurement results of diameters of copper column with the truth values, it is shown that the accuracy of the digital image processing is 10-4, which is higher than that of traditional method. Digital image processing technique can meet the high accuracy measurement of soil specimen deformation.

关 键 词：土工三轴试验 数字图像测量 误差分析 土样变形 计算机数字图像识别 变形测量 强度 应力应变 

分 类 号：TU411.7[建筑科学—岩土工程] TP391.41[建筑科学—土工工程]