2021-04-22T02:31:02Z
http://oa.upm.es/cgi/oai2
oai:oa.upm.es:42137
2016-07-04T07:53:03Z
7374617475733D707562
7375626A656374733D636F6E737472756363696F6E
747970653D636F6E666572656E63655F6974656D
Ranges of validity of some distribution functions for blast-fragmented rock
Sanchidrián Blanco, José Angel
Civil Engineering and Construction
The general ranges of validity of some distribution functions are assessed from their behaviour with 119 sets of fragmentation data from bench blasting obtained by sieving. The emphasis is on determining the lower size/passing limit that the size-scaled Rosin-Rammler, Grady and Swebrec functions, and their bi-component versions, can represent with reasonable precision. By fitting these functions to the data using different weights, the accuracy of the fit varies in the different size/passing zones, so that an overall knowledge of the capacity of the function is obtained across the whole size range, from the coarse zone to the fines. Reasonable ranges of use of bimodal Rosin-Rammler and extended Swebrec (all of them 5-parameter, bi-component distributions) are, in terms of percentage passing p, 99>p>2 % (up to 100 % for the extended Swebrec), or 90>p>0.5 %, in which the expected error of the calculated size is below 15 % in the extremes of the range, and less than 5 % in most of the central range; maximum errors (i.e. errors that will only rarely be exceeded) are typically less than 50 % in the central range, and up to about 100 % in the extremes. Ranges of use for the Swebrec and the size-scaled Rosin-Rammler (3-parameter distributions), with only slightly larger errors than the bi-components, are 100>p>5 % or 80>p>2 %. The classical 2-parameter Rosin-Rammler can be used in the range 95>p>20 % or 90>p>10 %, with expected and maximum errors less than about 15 % and 100 % respectively.
E.T.S.I de Minas y Energía
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
2015
info:eu-repo/semantics/conferenceObject
Presentation at Congress or Conference
11th International Symposium on Rock Fragmentation by Blasting | 11th International Symposium on Rock Fragmentation by Blasting | 24-26 Agosto 2015 | Sydney, Australia
PeerReviewed
application/pdf
eng
info:eu-repo/semantics/restrictedAccess
http://oa.upm.es/42137/