土工三轴试验试样全表面变形数字图像测量系统的精度分析

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Abstract Possible sources of both system errors and random errors for digital image processing system have been discussed. Calibrations have been made to get ride of system errors such as lens distortion. As for random errors，necessary improvements for experimental environment and data processing have been made. After all these measures taken，other error sources remained are not quantified separately，instead，accuracy of the entire system is examined. Capability of using this system for strain measurement in triaxial tests is illustrated throught comparisons of strain results obtained from both this system and conventional measurement techniques. Finally，the accuracy of this system is quantified through comparison of strain results obtained by both image processing technique and a static strain tester，and the statistical accuracy value is given out to be 4×10－5.

Key words： soil mechanics triaxial test system accuracy whole surface deformation measurement volumetric strain

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	Articles by authors
	LIU Xiao1
	SHAO Longtan1
	GUO Xiaoxia1
	HUANG Chuan2
	XUE Jie1
	YANG Song3
	4

Cite this article:

LIU Xiao1,SHAO Longtan1,GUO Xiaoxia1, et al. ACCURACY ANALYSIS OF DIGITAL IMAGE PROCESSING SYSTEM FOR TRIAXIAL SPECIMENS WHOLE SURFACE DEFORMATION MEASUREMENT[J]. , 2012, 31(S1): 2881-2887.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2881

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