Blast Design Parameters

Rock mass properties and blasting parameters control the efficiency of a blasting operation. In the present combined dataset statistical analysis the SB ratio a significant parameter influencing fragmentation was excluded due to poor variability in this parameter ie.

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High production volumes requiring large sized fleet.

. In critical situations digging a trench between the blast and the structure can further reduce ground vibration. Charge parameters of blast holes. Special requirements may require a design outside these rules.

The developed equations shed light on the influence of chosen blast design parameters on fragmentation. Modifying the blast design parameters. The blast design parameters utilized in the quarry are shown in figure 1 8.

Parameters for ore mining as it significantly affects further production process and profit return. Numbers of holes required to blast. Drill hole diameter ii.

Powder factor desired iii. By avoiding time consuming tasks such as scan-lines and rock sample collection for laboratory tests MWD techniques can not only save time but also improve the. Cost of explosive iv.

Reduction and optimum blast design parameter will give an economical result. Download Table Blast design parameters from publication. Key Tunnel Blast Design Parameters.

Tim Magub Ove Arup Partners Hong Kong Limited. This video lecture contains the basics of blast design parameters - Burden spacing depth etc. For reference - Jimeno E.

Benches may be designed and carried forth with more. Baobao Chen 12 Changyou Liu 12 and Jingxuan Yang 12. The blast engineer will only need to input parameters such as proposed.

Efforts to estimate effective blast design principles that could be applied in any geological and technical conditions are made. In order to blast the in-situ rock to the desired fragment size blast design parameter such as bench height hole diameter spacing burden hole length bottom charge specific charge and. Physico-mechanical properties of rock.

Large production drills and large hole diameters. Several blast operations were conducted using both traditional and modified blasting design parameters on the same ore bench with the same geological conditions. The parameters are i.

BLAst DESigner Software BLADES calculates blast plan parameters explosives charge distribution initiation timing and sequence results in terms of rock breakage and fragment size distribution. Measurement while drilling MWD techniques can provide a useful tool to aid drill and blast engineers in open cut mining. The blast design parameters used by the mine owners in ore bench blasting were obtained and later modified using Sharma PA and Langefors and Kihlstrom 1976s Swedish new method blasting.

Request PDF Blast Design Using Measurement While Drilling Parameters Measurement while drilling MWD techniques can provide a useful tool to. Subdrill - The Underutilised Blasting Parameter January 2020. Implementation of Flexigel Bulk System A Case Study of West Bokaro Colliery Tata Steel Limited Drilling Blasting is the first.

Burden spacing stemming bench stiffness ratio and powder factor were moved systematically and analysed to measure their influence on muckpile properties namely throw drop and lateral spread in order to ascertain the most optimum set of blast design parameters to achieve muckpile properties for optimum. Joint Technical Seminar by AGSHK HKIE Geotechnical Working Group on Cavern Tunnel Engineering HKTS. Three invariants are suggested as basis to determine drilling and blasting parameters for expected fragmentation results.

M2 Face Area. Loading times of the shovel and fragment sizes were obtained after the blasts from ore bench where both the traditional and modified blasting design parameters were applied. 114 DELAY PATTERNS Delay patterns and varying the hole array to fit natural excavation topography allow for more efficient use of the explosive energy in the blast.

Generates blast plan and according to the delay pattern structure simulation. In terms of at least two parameters which are typically the peak pressure and impulse or the peak pressure and equivalent trian-gular duration t d. Key blast design parameters ie.

This table describes the most common ratios between blast design parameters for production blasting in rock. Profile Shape Rock Type Quality. Bench parameters bench height drill angle number of holes to be blasted and.

But all the blast design parameters cannot be changed depending on the type of strata and bench height. A design blast pressure may be defined in terms of just the peak pressure only if there is an understanding that the blast-load duration is long compared with the response time of. BLAST DESIGN Figure 8-2 Staggered pattern Figure 8-3 Sing Figure 8-1 Square or rectangular pattern.

Kuznetsovs equation Table 1 Design Parameters for Shots 1 and 2 Shot Shot This equation Eqn. Blast Design Using Measurement While Drilling Parameters. Burden B is the distance from explosive charge to the nearest free or open face at the time the hole detonates.

1 is for estimating the mean Parameter Units 1 2 fragmentation expected from the use of selected Burden M 43 47 Spacing M 47 50 blast parameters. Design and Application of Blasting Parameters for Presplitting Hard Roof with the Aid of Empty-Hole Effect. Blast Design Parameters 21 Overview The following are the some of the important parameter which generally govern for blast design.

L and Carcedo A. Blast design parameters of bench blasting are the controlling parameters which regulate the desired fragmentation level of a particular blast. Tunnel Blast Design.

The extent to which it. Analysis on the Field Effect. Hole Diameter D Burden 20 to 40 D Spacing 11 to 14 B 115 for even hole distribution in a staggered pattern Subgrade 8 to 12 D.

1 Key Laboratory of Deep Coal Resource Mining. When predicted or monitored vibrations exceed the statutory limits ground vibrations are to be controlled by modifying the blast design parameters. Here type of the rock dynamic tensile strength tensile strength compressive strength.

Methodology The study of the various parameters of blasting suggests that the powder factor should be constant as per the requirement.

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