摘要
为研究齐大山铁矿边坡混合岩在单轴压缩条件下的变形场演化规律,采用单轴压缩试验和白光数字散斑相结合的方法开展混合岩变形局部化研究,得到了岩样的水平位移场变化及变形局部化带形成规律。研究结果表明:混合岩岩样的破坏大致分为压密、弹性变形、变形局部化带缓慢形成及加速形成并趋于稳定4个阶段,压密状态时,岩样最大水平位移值较小,随着荷载水平的不断增大,水平位移值梯度变化凸显,形成变形局部化带,微小裂隙逐渐扩展成较大裂隙,并贯通试件内部,使得岩样损伤加剧,由单轴压缩状态向整体拉伸位移状态转化,加载后期局部化带变宽并趋于稳定。
In order to study the evolution pattern of deformation field of mignatite slope in Qidashan Iron Mine under uniaxial compression,uniaxial compression test and white light digital speckle are combined to study local deformation of the mixed rock,and variation of the horizontal displacement field and formation law of local deformation zone of the rock samples are obtained.The results show that the mixed rock sample failure roughly falls into stages of compaction,elastic deformation,local deformation zones forming and accelerating to be stable.The samples present minimum horizontal displacement for compaction,with increasing load,the horizontal displacement gradient change remarkably to form local deformation band and tiny cracks gradually expand and go through the specimen.As a result,damage of the samples intensifies with the state shifting from uniaxial compression to full tensile displacement,and the localization zone becomes wider and tends to be stable in the later loading period.
作者
王润
曹洋
吕蒙
代俊杰
徐子洺
张璐
陈肖肖
WANG Run;CAO Yang;LV Meng;DAI Junjie;XU Ziming;ZHANG Lu;CHEN Xiaoxiao(Qidashan branch of Anshan Iron and Steel Group Mining Co.,Ltd.,Anshan 114000,China;Anshan Iron and Steel Group Mining Co.,Ltd.,Anshan 114000,China;Liaoning Technical University,Fuxin 123000,China)
出处
《有色金属设计》
2022年第4期14-18,共5页
Nonferrous Metals Design
关键词
混合岩组
单轴压缩
数字散斑
变形局部化
形成规律
Migmatite formation
Uniaxial compression
Digital speckle
Deformation localization
Formation law
