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论文类型：期刊论文

发表时间：2015-07-11

发表刊物：Yantu Lixue/Rock and Soil Mechanics

收录刊物：EI、PKU、ISTIC、Scopus

卷号：36

页面范围：669-684

ISSN号：10007598

摘要：Application of digital image processing technique to measuring specimen deformation in triaxial test can solve a series of problems about deformation measurement in traditional triaxial test. This paper introduces the development of triaxial image measuring system, which can be divided into three stages: (1) Digital image measurement system based on edge recognition, which determines the radial deformation of soil specimen by tracking the changes of the edge location and axial deformation of soil specimen by identifying the white mark line. (2) Digital image measurement system based on corner recognition, which measures and tracking each corner point (node) position, and obtains the displacement of soil surface node at any moment; we can obtain the displacement (deformation) field and strain field of the soil surface by using the finite element technique. (3) Whole surface digital image measurement system, based on the front surface corner recognition, together with two reflection mirrors situated inside the triaxial cell, a 360 degree coverage of specimen's deformation could be achieved using only one video camera. Digital image measurement system for measuring specimen deformation in triaxial test has the unparalleled advantages comparing with traditional measurement methods, especially in the research of the constitutive model. ?, 2015, Academia Sinica. All right reserved.