Production Blast-Induced Vibrations in Longhole Open Stoping

2012 ◽  
pp. 160-170
Author(s):  
John Henning ◽  
Hani Mitri
Keyword(s):  
Mining Operation ◽  
Metal Mining ◽  
Blast Vibration ◽  
Zone Width ◽  
Blast Design ◽  
Design Practices ◽  
Powder Factor ◽  
Vibration Attenuation ◽  
Stope Design

This paper examines stope design approaches employed at a metal mining operation in Canada for extraction of transverse primary, transverse secondary, and longitudinal stopes. Variations in stope and slot design, blast design, and blast vibration attenuation are presented in detail. It is shown that the type of blasthole stoping technique employed varies according to stope sequence and ore zone width. Within this range of stopes, blasting design practices have been standardized in terms of drillhole diameter, powder factor, and the type and pattern of the explosives used.

Production Blast-Induced Vibrations in Longhole Open Stoping

2010 ◽  
Vol 1 (2) ◽  
pp. 1-11 ◽  
Author(s):  
John Henning ◽  
Hani Mitri
Keyword(s):  
Mining Operation ◽  
Metal Mining ◽  
Blast Vibration ◽  
Zone Width ◽  
Blast Design ◽  
Design Practices ◽  
Powder Factor ◽  
Vibration Attenuation ◽  
Stope Design

This paper examines stope design approaches employed at a metal mining operation in Canada for extraction of transverse primary, transverse secondary, and longitudinal stopes. Variations in stope and slot design, blast design, and blast vibration attenuation are presented in detail. It is shown that the type of blasthole stoping technique employed varies according to stope sequence and ore zone width. Within this range of stopes, blasting design practices have been standardized in terms of drillhole diameter, powder factor, and the type and pattern of the explosives used.

A review study of predictive model blast vibration attenuation equation by using neural network as an evaluator

2011 ◽  
Vol 25 (1) ◽  
pp. 69-85 ◽  
Author(s):  
Sugeng Wahyudi ◽  
Hideki Shimada ◽  
Ganda Marihot Simangunsong ◽  
Takashi Sasaoka ◽  
Kikuo Matsui ◽  
...  
Keyword(s):  
Neural Network ◽  
Predictive Model ◽  
Blast Vibration ◽  
Vibration Attenuation ◽  
Review Study

scholarly journals PRELIMINARY ASSESSMENT OF THE EFFECTS OF BLAST DESIGN FACTORS ON FRAGMENTATION AT LAFARGE KANTHAN LIMESTONE QUARRY, CHEMOR, PERAK

2021 ◽  
Vol 10 (2) ◽  
Author(s):  
Shaib Abdulazeez Shehu ◽  
Mohd Hazizan Mohd Hashim ◽  
Nur Aliah Hazirah Awang Kechik
Keyword(s):  
Compressive Strength ◽  
Correlation Coefficient ◽  
Uniaxial Compressive Strength ◽  
Fragment Size ◽  
Design Parameters ◽  
Stiffness Ratio ◽  
Blast Design ◽  
Powder Factor ◽  
Controllable Factors ◽  
The Mean

The results of blasting affect every other downstream operation in quarrying and mining process. Factors influencing blast results can be classified as either controllable or non-controllable. If desired fragmentation is to be obtained, the controllable factors (blast geometry and explosive properties) must be sufficiently designed to match the non-controllable ones (geological factors and legislative constraints). This study investigates the influence of blast design parameters on rock fragmentation. Six different blast designs were studied and analyzed. Rock samples were obtained from each face to evaluate the uniaxial compressive strength (UCS). Images of muck pile were captured using suitable digital camera. The images were uploaded into the WipFrag software to analyze the fragmentation resulting from the blasting. The particle size distribution of each blast was obtained, and the mean fragment size correlated with the blast design parameters. The percentage cumulative passing for gyratory crusher with the feed size of 1500 mm ranges between 92.8 to 100%. The stiffness ratio, powder factor and uniaxial compressive strength have high correlation with mean fragment size. The stiffness ratio increases with mean fragment size with a correlation coefficient of 0.89. The mean fragment size becomes finer with increase in powder factor with a correlation coefficient of 0.76. Powder factor also has a high correlation with the uniaxial compressive strength of the rock. The higher the uniaxial compressive strength of rock, the higher the powder factor needed for a specified fragment size. In this study, spacing to burden ratio has a very weak correlation with the fragment size. All the studied blast events produced good fragmentation with a uniformity index varying from 2.097 to 2.525.

Development of a New Blast Vibration Prediction Model Incorporating Burden Variations in Surface Blasting

2012 ◽  
pp. 171-187
Author(s):  
M. Ramulu
Keyword(s):  
Vibration Monitoring ◽  
Design Parameters ◽  
Rock Fracturing ◽  
Blast Vibration ◽  
Vibration Intensity ◽  
Blast Design ◽  
Vibration Prediction ◽  
The Common ◽  
Predictor Model ◽  
Quantitative Explanation

The globally followed common vibration predictor model includes distance from source to vibration monitoring location and quantity of explosive charge per delay without giving much consideration to blast design parameters. Though there are qualitative assertions on the influence of burden on the vibration intensity by many researchers, no work on quantification of influence of burden has been reported. This paper deals with the development of a predictor model incorporating burden deviations in the existing predictor equation. The influence of burden on the vibration was viewed from the angle of detonation and rock fracturing during blasting. The new predictor equation is based on existing models developed by other researchers on the influence of burden on the blasthole pressure and vibration intensity as well as on some logical assumptions. The influence of burden on vibration was examined in two independent phases of blasting, and the net effect was calculated by adding the influence in both the phases. The study provides a quantitative explanation for the common observations of increased vibration levels produced by the blast rounds with excess burden and/or misfired shots.

scholarly journals Minimising Backbreak at the Dewan Cement Limestone Quarry Using an Artificial Neural Network

2017 ◽  
Vol 62 (4) ◽  
pp. 795-806
Author(s):  
Khan Muhammad ◽  
Akram Shah
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Field Tests ◽  
Ann Model ◽  
Limestone Quarry ◽  
Blast Design ◽  
Powder Factor ◽  
Controllable Factors ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

Abstract Backbreak, defined as excessive breakage behind the last row of blastholes in blasting operations at a quarry, causes destabilisation of rock slopes, improper fragmentation, minimises drilling efficiency. In this paper an artificial neural network (ANN) is applied to predict backbreak, using 12 input parameters representing various controllable factors, such as the characteristics of explosives and geometrical blast design, at the Dewan Cement limestone quarry in Hattar, Pakistan. This ANN was trained with several model architectures. The 12-2-1 ANN model was selected as the simplest model yielding the best result, with a reported correlation coefficient of 0.98 and 0.97 in the training and validation phases, respectively. Sensitivity analysis of the model suggested that backbreak can be reduced most effectively by reducing powder factor, blasthole inclination, and burden. Field tests were subsequently carried out in which these sensitive parameters were varied accordingly; as a result, backbreak was controlled and reduced from 8 m to less than a metre. The resulting reduction in powder factor (kg of explosives used per m3 of blasted material) also reduced blasting costs.

scholarly journals Safe Blast Design for Efficient and Sustainable Underwater Excavation: Art Meets Science!

2021 ◽  
Author(s):  
BALAMADESWARAN P ◽  
A.K. Mishra ◽  
E. Kumar ◽  
K. Manikanda Bharath
Keyword(s):  
Fragment Size ◽  
Blast Design ◽  
Drilling Parameters ◽  
Powder Factor ◽  
Proper Design ◽  
Aqueous Layer ◽  
High Level ◽  
Selection Of

Abstract Most of the dredging work associated with harbor, port, channel deepening, and other related operation requires underwater blasting due to the characteristics of material being dredged / moved. Underwater blasting is typically used to remove rocks for deepen harbours and channels, creating channels and levees, installing conduits, and other more specialised blasting operations that shall be completed below sea. Usually, such dredging work occurs in deep-water of varying between 16–20m in order to remove just few meters of rocks. Hence, this type of blasting activity needs high level of skill and familiarity than equivalent activities carried out above the surface of water because of aqueous layer over the its rock. Therefore, the factors such as selection of drilling parameters and drilling equipment, selection of appropriate explosives and accessories, usage of correct powder factor, determination of safe explosive charges per delay and selection of suitable personnel are studied carefully for accomplishing the successful underwater blasting operations. In addition to the above, the system shall also address the proper design for the underwater blasts to excavate the rock to the required depth keeping in view the permissible allowances of minimum and maximum depth and fragment size required. While adopting underwater blasts, adequate safety measures are also defined for safety of men, other vessels in the blasting zone and structures from blasting vibrations. Here, the authors broadly outline their approach with respect to underwater blasting using the existing blasting technology, with a case study.

scholarly journals A Method for Multihole Blasting Seismic Wave Prediction and Its Application in Pillar Recovery

2021 ◽  
Vol 9 ◽  
Author(s):  
Lianku Xie ◽  
Daiyu Xiong ◽  
Tianhong Yang ◽  
Li He ◽  
Qinglei Yu
Keyword(s):  
Seismic Wave ◽  
Delay Time ◽  
Far Field ◽  
Improved Method ◽  
Fundamental Vibration ◽  
Blast Vibration ◽  
Measuring Point ◽  
Blast Design ◽  
Wave Prediction ◽  
The Difference

Long-hole blasting in mines is likely to cause strong vibration of surficial infrastructure, greatly damage the rock mass surrounding goaf near explosion center, and possibly induce blast vibration disasters. In this article, an improved method for multihole blasting seismic wave prediction is proposed to estimate far-field blast vibration. In this method, the fundamental vibration waveforms are firstly measured through the field blast with a single deck at an underground pilot area. The fundamental vibration waveforms are then used to simulate the vibration waveforms for a single-deck case in the production blast by considering the difference of the equivalent distances from the production blast site and the pilot area to the surface measuring point. The vibration waveforms for the single-deck case are linearly superposed to predict the possible vibration waveforms in production blast with multiple long holes and decks according to the designed delay time between decks. Based on these predicted waveforms, the blast vibration can be estimated and the blast design can be optimized to determine a rational delay time in accordance with the vibration limit. The proposed method was applied in pillar recovery of Hongling Polymetallic Mine to optimize the long-hole blast design to manage blast vibration. The rational delay time for the 716 production blast design was recommended as 26 ms. The practice showed that the blast vibration induced by the 716 production blast has been managed, and the predicted and the measured waveforms agree well. It provides an effective method for multihole blast design to control blast vibration.

ANALISIS KESTABILAN LERENG DINDING AKHIR DI PIT BARATLAUT PADA PENAMBANGAN BATUBARA DI PT. PUTERA BARA MITRA , KECAMATAN MENTEWE, KALIMANTAN SELATAN

KURVATEK ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 21-34
Author(s):  
Untung Wahyudi ◽  
Excelsior T P ◽  
Luthfi Wahyudi
Keyword(s):  
Slope Stability ◽  
Mining Operation ◽  
Subsurface Water ◽  
Mining System ◽  
Mine Site ◽  
Analysis And Design ◽  
The Stability ◽  
End Wall ◽  
Wall Slope ◽  
Mining Slope

PT. Putera Bara Mitra used open mining system for mining operation, Yet the completion of study on the end wall slope stability that  undertaken by geotechnical PT. Putera Bara Mitra in Northwest Pit and the occured a failure in the low wall on the 1st June 2012 led to the need for analysis and design the overall slope at the mine site. To analyze and design the overall slope, used value of the recommended minimum safety. The value was based on company for single slope SF ≥ 1.2 and SF ≥ 1.3 for overall slope. The calculation used Bichop method with the help of software slide v 5.0. Geometry improvements was done at the low slopes that originally single wall with a 30 m bench height and a slope 70° with SF = 0.781, into 4 levels with SF = 1.305. The analysis explained the factors that affect the stability of the low wall included the mining slope geometry, unfavorable drainase system, material stockpiles and seismicity factors. It was necessary to do prevention efforts to maintain the stability of the slope included the redesign to slope geometry, handling surface and subsurface water in a way to control slopes draining groundwater, vegetation stabilization using and monitoring slope using Total Station with Prism and Crackmeter to determine the movement of cracks visible on the surface. 

Call the Plumber! Engaging Students With Authentic Engineering Design Practices

Science Scope ◽  
2017 ◽  
Vol 040 (05) ◽  
Author(s):  
Chandan Dasgupta ◽  
Beth Sanzenbacher ◽  
Jeremy Siegel ◽  
Deanna McBeath ◽  
Tom Moher
Keyword(s):  
Engineering Design ◽  
Design Practices
Sign in / Sign up

Export Citation Format

Share Document