辉绿岩单轴压缩过程变形场的DIC监测与模拟  

DIC monitoring and simulation of deformation field during uniaxial compression of diabase

作　　者：冯慧坤 吕原君 罗战友 刘广建 FENG Huikun;LÜYuanjun;LUO Zhanyou;LIU Guangjian(Rock Mechanics Institute,Ningbo University,Ningbo 315211,China;School of Civil Engineering,Shaoxing University,Shaoxing 312000,China)

机构地区：[1]宁波大学岩石力学研究所,浙江宁波315211 [2]绍兴文理学院土木工程学院,浙江绍兴312000

出　　处：《宁波大学学报（理工版）》2024年第5期27-34,共8页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金(42277147);宁波市自然科学基金(2023J085).

摘　　要：作为贮备丰富和应用广泛的辉绿岩,其内在的力学特性及破坏模式影响着辉绿岩矿的开采和使用安全.以辉绿岩标准试样为研究对象,利用万能试验机和三维全场应变测量系统获取其单轴压缩过程的力学参数,通过数字图像相关技术(Digital Image Correlation,DIC)获取试样测试过程的位移和应变,利用颗粒流分析软件(Particle Flow Code,PFC)建立基于试验参数的二维模型,给出应变场获取方法并实施单轴压缩模拟试验.结果表明:DIC技术能反映出试样表面压缩断裂过程的位移场及应变场,但试样表面颗粒跌落后存在无法监测的缺陷;PFC可以模拟全过程的应变场,且试样起裂位置及裂纹扩展路径与DIC监测结果匹配,但应变场测量精度受到测量圆、布局方式等参数设置的影响.DIC监测技术和数值分析技术的有效结合能更好揭示试样破坏过程的应变演化规律,研究成果可为岩石试样破坏的应变演化提供参考.Diabase with its abundant reserves and extensive applications has been widely studied,and its mechanical properties and failure modes have a significant impact on the mining and utilization of diabase.This study focuses on standard diabase specimens,utilizing a universal testing machine and a three-dimensional full-field strain measurement system to acquire mechanical parameters during the uniaxial compression process.Digital Image Correlation(DIC)technology is employed to observe displacement and strain in the specimens during the testing process,and Particle Flow Code(PFC)software is used to construct a two-dimensional model based on the parameters tested,conducting uniaxial compression simulation experiments.The results indicate that the DIC technology can accurately reflect the displacement and strain fields during the compression fracture process of the specimens.However there is problem of unable to monitor once the particles fall off the specimen surface.By comparing DIC monitoring data with PFC simulation data,it is found that the crack initiation location and crack propagation path of the specimens have high consistency,but the measurement accuracy of the strain field is affected by parameters such as the measurement circle and layout method.The combination of DIC monitoring technology and numerical analysis technology can reveal the strain evolution rules in the specimen failure process more deeply,providing valuable references for studying the failure of specimens under external forces.

关 键 词：辉绿岩 单轴压缩 数字图像相关技术 数值分析 应变场 

分 类 号：TU458.3[建筑科学—岩土工程]