Measurement of Blast Fragmentation最新文献_第4页

On-line fragmentation measurement utilizing the CIAS(R) system 利用CIAS(R)系统在线破碎测量

Measurement of Blast Fragmentation Pub Date : 2018-12-19 DOI: 10.1201/9780203747919-13

D. Downs, B. Kettunen

引用次数: 4

Blast fragmentation measurement using GoldSize GoldSize爆破破片测量方法

Measurement of Blast Fragmentation Pub Date : 2018-12-19 DOI: 10.1201/9780203747919-14

T. Kleine, A. Cameron

引用次数: 8

WipFrag image based granulometry system 基于WipFrag图像的粒度测量系统

Measurement of Blast Fragmentation Pub Date : 1900-01-01 DOI: 10.1201/9780203747919-15

N. Maerz, Tom C. Palangio, J. Franklin

引用次数: 80

Image sampling techniques and requirements for automated image analysis of rock fragmentation 岩石破碎自动图像分析的图像采样技术和要求

Measurement of Blast Fragmentation Pub Date : 1900-01-01 DOI: 10.1201/9780203747919-18

N. Maerz

{"title":"Image sampling techniques and requirements for automated image analysis of rock fragmentation","authors":"N. Maerz","doi":"10.1201/9780203747919-18","DOIUrl":"https://doi.org/10.1201/9780203747919-18","url":null,"abstract":"When photographing or video taping rock fragmentation, sampling strategies have to be carefully considered, in order to produce an image that is both capable of being analyzed, and representative of the entire rock assemblage. A consideration is where the image is to be taken. It could be the top of a muckpile, the front edge or a cross section of the muc k pile as it is being mucked. It could be photographed in the back of a haulage truck, the bucket of a loader, or on a conveyor belt. Or it could be photographed in a stockpile. All strategies are valid, but each must be evaluated to ensure good picture quality (i.e. not obscured by dust), and representative sampling (i.e. not skewed because of some size sorting by mechanical processes). Another consideration is the scale of the image. At the very least, the area must be limited so that the individual blocks can be recognized by the image analysis algorithms. If zoom-merging techniques (images at different scales) are to be used, an appropriate strategy must be employed so that the relative number of images at each scale somewhat reflect the differences in scale. Furthermore, when zooming, care must be taken to avoid pointing the camera at zones of large or small blocks that might attract the eye. A final consideration is the angle of the surface being photographed with respect to the camera. Ideally the surface should be perpendicular to the direction the camera is pointed, as that eliminates perspective error. Perspective error can also be reduced by using camera lenses with long focal lengths where possible. As an alternative, the image can be rotated (tilted) to compensate for oblique angles. This requires two perpendicular scale bars to be appropriately placed in the image.","PeriodicalId":284411,"journal":{"name":"Measurement of Blast Fragmentation","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114496503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 20

Block size determination around underground openings using simulations 利用模拟确定地下洞口周围的块体大小

Measurement of Blast Fragmentation Pub Date : 1900-01-01 DOI: 10.1201/9780203747919-31

N. Maerz, P. Germain

{"title":"Block size determination around underground openings using simulations","authors":"N. Maerz, P. Germain","doi":"10.1201/9780203747919-31","DOIUrl":"https://doi.org/10.1201/9780203747919-31","url":null,"abstract":"The in situ block size of the rock mass may be the single most important parameter influencing the stability and strength of some underground openings. Rock masses can often reasonably be characterized by a simple size-strength classification. The actual block size distribution is the product of the interaction between the joint orientation, spacing and persistence of that rock mass. Despite the importance of in situ block size, it is currently difficult to quantify. Block size is typically estimated as one of three indices, Rock Quality Designation (RQD), Volumetric Joint Count (J v ), and Block Size Index (I b ). These, being index properties do not quantify actual block size. The Centre de Technologie Noranda has initiated standardized scanline mapping techniques for the purposes of characterizing the discontinuities. This data is being used to quantify block size. Algorithms have been developed which simulate the division of a specified volume of rock by a number of joints or joint sets. These joints can be generated stochastically, based on summary statistics and inferred distributions of the field data, or deterministically, using the actual joints measured along the scanline.","PeriodicalId":284411,"journal":{"name":"Measurement of Blast Fragmentation","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133884503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

Reconstructing 3-D block size distributions from 2-D measurements on sections 从剖面上的二维测量数据重建三维块尺寸分布

Measurement of Blast Fragmentation Pub Date : 1900-01-01 DOI: 10.1201/9780203747919-7

N. Maerz

引用次数: 21