单轴循环加卸载岩石非均匀变形演化特征  

Properties of non-uniform deformation evolution of rock under uniaxial cyclic loading and unloading

作　　者：杨小彬[1,2] 韩心星 刘恩来 张子鹏[1,2] 汪腾蛟 张立辉 YANG Xiaobin;HAN Xinxing;LIU Enlai;ZHANG Zipeng;WANG Tengjiao;ZHANG Lihui(School of Resource and Safety Engineering, China University of Mining and Technology （ Beijing）, Beifing 100083, China;Beijing Key Laboratory for Precise Mining of lntergrown Energy and Resources,Beijing 100083, China;Bnlianta Coal Mine,Shenhua Shendong Coal Group, Ordos 017209, China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]共伴生能源精准开采北京市重点实验室,北京100083 [3]神华神东煤炭集团补连塔煤矿,内蒙古鄂尔多斯017209

出　　处：《煤炭学报》2018年第2期449-456,共8页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(51274207);国家自然科学基金青年基金资助项目(50904071)

摘　　要：为了研究循环加卸载下岩石材料的力学响应机制,开展了花岗岩试件单轴循环加卸载非均匀变形演化试验研究。采用CCD相机对试验过程中试件的变形图像进行采集,基于数字散斑相关方法分析了循环加卸载过程中试件的非均匀变形、局部化影响特征参数演化规律。研究发现:随着循环次数的增加,非均匀变形现象越来越明显;非均匀变形统计指标Sw随着加载应力的增大而增大,随着循环次数的增加而加剧;当试件出现局部化现象后,后续循环随着应力的增大及循环次数的增加,其挤压位移和局部化带影响宽度皆有所增大。In order to study the mechanic responding mechanism of rock materials under cyclic loading and unloading,uniaxial cyclic loading and unloading tests were carried out to investigate the non-uniform deformation evolution processes of granite specimens. The deformation images of specimens during the tests were collected by CCD camera and based on the digital speckle correlation method,the non-uniform deformation,the evolution laws of the characteristic parameters of the localization during cyclic loading and unloading were analyzed. The research results show that：With the increase of cycle numbers,the non-uniform deformation is more and more obvious. The statistical index Swof non-uniform deformation increases with the increase of loading stress,and increases with the increase of cycle numbers. After the localization of a specimen appears,the extrusion displacement and the influence width of the localization band all increase with the increase of stress and cycle numbers in the subsequent cycles.

关 键 词：循环加卸载 数字散斑相关方法 非均匀变形 局部化 位移 

分 类 号：TD315[矿业工程—矿井建设]