Ranges of validity of some distribution functions for blast-fragmented rock

Sanchidrián Blanco, José Angel (2015). Ranges of validity of some distribution functions for blast-fragmented rock. In: "11th International Symposium on Rock Fragmentation by Blasting", 24-26 Agosto 2015, Sydney, Australia. pp. 741-748.

Description

Title: Ranges of validity of some distribution functions for blast-fragmented rock
Author/s:
  • Sanchidrián Blanco, José Angel
Item Type: Presentation at Congress or Conference (Article)
Event Title: 11th International Symposium on Rock Fragmentation by Blasting
Event Dates: 24-26 Agosto 2015
Event Location: Sydney, Australia
Title of Book: 11th International Symposium on Rock Fragmentation by Blasting
Date: 2015
Subjects:
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 42137
DC Identifier: http://oa.upm.es/42137/
OAI Identifier: oai:oa.upm.es:42137
Deposited by: Memoria Investigacion
Deposited on: 04 Jul 2016 07:53
Last Modified: 04 Jul 2016 07:53
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