Assessment of digital image correlation method in determining large scale cemented rockfill strains  

作　　者：Bob A.Lingga Derek B.Apel Mohammadali Sepehri Yuanyuan Pu 

机构地区：[1]School of Mining and Petroleum Engineering,University of Alberta,Edmonton T6G 2W2,Canada

出　　处：《International Journal of Mining Science and Technology》2019年第5期771-776,共6页矿业科学技术学报（英文版）

摘　　要：A conventional contact method(using linear transducers)and a non-contact method are deployed to measure the axial and lateral deformations of large scale cylindrical cemented rockfill specimens.Experimental works incorporating two pinhole cameras to create one stereovision by digital image correlation shows that the non-contact method is as reliable for testing large cylindrical specimens as measurements done by using linear variable displacement transformer and string potentiometer.Considering this particular large specimen,the experiment resulted in the acceptable mean difference between lateral strain using both methods is 5.1 percent,and 14.5 percent for the axial strain.This occurrence is inevitable due to the heterogeneity of the concrete system and the placement of the monitoring point in digital image correlation method,although the comparison of stress-strain relationship in both methods still indicates a conformity.Based on the results of the present experiments,the authors recommend the noncontact method for a detailed investigation of the material behavior during the uniaxial compressive strength tests.Full field strain measurement enables this digital method to examine local strains near cracks at any point,a very useful tool for studying material deformation behavior.

关 键 词：Experimental testing CEMENTED ROCKFILL Digital image correlation Strain measurement MINE BACKFILL 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TD803[自动化与计算机技术—计算机科学与技术]