动静组合荷载下砂岩冲击岩爆碎屑分形特征  

Analysis of fractal characteristics of fragment of sandstone impact rock burst under static and dynamic coupled loads

作　　者：何满潮[1] 王炀[1,2] 苏劲松 刘冬桥[1] HE Manchao;WANG Yang;SU Jinsong;LIU Dongqiao(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining ＆ Technology（Beijing）,Beijing 100083,China;School of Mechanics ＆ Civil Engineering,China University of Mining ＆ Technology（Beijing）,Beijing 100083,China;Nanjing Agile Real Estate Development Company Limited,Jiangsu,Nanjing 210000,China)

机构地区：[1]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]南京雅居乐房地产开发有限公司,江苏南京210000

出　　处：《中国矿业大学学报》2018年第4期699-705,共7页Journal of China University of Mining & Technology

基　　金：国家重点研发计划专项项目(2016YFC0600901)

摘　　要：运用自主研发的冲击岩爆实验系统,进行了改变动载波幅和改变静载的两种冲击岩爆实验,收集实验后砂岩碎屑,使用图像处理软件对两种冲击岩爆中粒碎屑图片进行处理,获得岩爆碎屑的粒度-数量、周长-数量以及面积-数量分形维数值.选取两种冲击岩爆碎屑,拍摄不同倍数下的裂纹电镜扫描(SEM)图片,提取SEM图片微观裂纹,计算裂纹分形维数值.结果表明:不同的参数组合所计算的分形维数值不同;放大倍数越大,裂纹的分形维数越大;改变静载的冲击岩爆实验分形维数值要高于改变动载的冲击岩爆实验的分形维数值,碎屑更为破碎.Using self-developed impact rock burst experimental system,two types of impact rock burst experiments were carried out,of which one was induced by changing the static loads and the other was induced by changing the amplitude of dynamic load,respectively.The sandstone fragments after these two experiments were collected.Using image processing software to process the medium fragments images for two types of impact rock burst experiments,the fractal dimensions of granularity-quantity,perimeter-quantity and area-quantity relationships were calculated.Selecting the fragments for the two types of impact rock burst experiments,scanning electron microscope（SEM）technique was used to capture the images of micro-cracks with different magnification,and the fractal dimensions of the micro-cracks were calculated based on the digital information from the images.The results show that the fractal dimensions are different when different methods are used;the fractal dimension of the micro-cracks increased with increase of magnification;the fractal dimensions of the second type of impact rock burst experiment are greater than the first one,and the degree of crushing of the fragments aremore intense.

关 键 词：动静组合加载 冲击岩爆 碎屑 图像处理 分形维数 

分 类 号：TU458[建筑科学—岩土工程]