Optimal Design of Presplit Blasting Network of …
To ensure that the mining steps of deep concave open-pit coal mines with heterogeneous complex rock masses in arid areas are safely bounded by the design requirements and form a fixed side wall ...
WhatsApp: +86 18221755073
Engineering blasting operations
In levels of vibrations can damage the open pit slopes or underground pillar and lead to subsequent problems of safety and subsequent recovery of ore from the blast affected areas. In stopes, damage to the hanging wall can lead to slabbing, high dilution, and need for secondary blasting to relieve ore passes that become blocked by large ...
WhatsApp: +86 18221755073
Case study of establishing a safe blasting criterion for the pit …
Then, the final design criteria for safe blasting in Pasir mine are defined by the following scaled distance inequality: (6) D L 1 / 2 = D s ≥ 5 in Eq. (6) D s is in the …
WhatsApp: +86 18221755073
Optimization and Application of Spacing Parameter for …
In view of the near slope blasting in Barun open-pit mine, which has merged sublevel mining, the operation safety conditions of middle-sized and large equipment in the second phase expansion are ...
WhatsApp: +86 18221755073
Evaluation of Ground Vibration due to Surface Blasting at a …
Among many existing solutions to blast vibration problems, one can think of chocking through a buffered zone, inducing a free face by pre-splitting, and using explosives with lower shock wave energy.
WhatsApp: +86 18221755073
Impact of Open-pit Blasting on the Stability of Adjoining …
A study was conducted to investigate the damage potential to underground multi-seam openings caused due to vibration generated by open-pit coal mine blasting. The objective was to recommend optimal explosives weight per delay to be detonated in open-pit blasts to ensure the safety and stability of underground openings. Sixteen …
WhatsApp: +86 18221755073
Study on Blasting Technology for Open-Pit Layering of …
Due to the violent vibration caused by explosives during blasting, it will have a serious impact on the surrounding buildings and the lives of residents near the …
WhatsApp: +86 18221755073
Blast vibration damage to underground coal mines from adjacent open-pit
3.2.. Instrumentation in underground workingsThe selected area in each underground working for instrumentation was in the direction of advancing face of open-pit working and within 200. m from the open-pit working faces, This was done with an anticipation that opencast blast will come nearer and nearer and one day it may be over …
WhatsApp: +86 18221755073
Determination of Safe Distance While Blasting at Open Pit …
Abstract. This paper deals with problems related to the determination of safe distance with special reference to adverse effects accompanying blast work. One of them is related to …
WhatsApp: +86 18221755073
Stability Analysis of a Multi-Layered Slope in an …
The design of slopes in open pit mines requires an in-depth understanding of the ground behavior to predict the potential failure mechanism and to better determine the stabilization measures. This …
WhatsApp: +86 18221755073
Blast vibration effects in an underground mine …
Blast designs were optimised at open-pit mine to control vibration in view of long-term safety and stability of the underground openings. The underground development face blasts were also ...
WhatsApp: +86 18221755073
Blasting effect analysis of hole-by-hole millisecond minute …
For non-structural fractured rock mass, deep-hole blasting at the open pit coal mine usually results in a large amount of irregular rock bulk due to the structural plane, exerting impact on the ...
WhatsApp: +86 18221755073
Stability Analysis and Optimal Design of Ultimate Slope of an Open Pit …
The major goal of this study was to provide a stable and optimal design for the ultimate slope of the Shadan Open Pit Mine using numerical modeling to calculate the minimum factor of safety equal ...
WhatsApp: +86 18221755073
The Application of Shaped Charge Blasting Technology in Open-pit Mine
Bilateral cumulative tensile explosion, a control blasting technology of cumulative explosion, is put forward and defined, which aims at resolving the problems existing in conventional blasting ...
WhatsApp: +86 18221755073
Open pit mine blasting work requirements
The chassis resistance line refers to the distance from the center of the medicine column to the step slope on the level of the step platform. The chassis resistance line is generally used as the basis for the design of the blasting parameters, which is an important parameter in open-air blasting. (3) Charge structure of open-pit blasting . 1.
WhatsApp: +86 18221755073
Numerical analysis of high bench blasting in open pit mine
Heidaigou open-pit coal mine was chosen as an example to explore the influences of bench height on cast blasting in open-pit coal mines. Theoretical analyses and site tests were carried out ...
WhatsApp: +86 18221755073
(PDF) Optimization of Close-Range Blasting Design with …
In order to reduce the large rocks produced by blasting of hillside open-pit mine with heterogeneous and complex rock mass in arid area, based on the lithology characteristics of complex rock mass ...
WhatsApp: +86 18221755073
Surface Vibration of Throw-Type Blast in an Open-Pit Mine
The results show that: 100 ~ 300 m away from the blasting area, the radial direction (X direction) of the blasting area produces the largest vibration velocity of 26.8 cm/s, but at the same time, the decay rate of the peak vibration velocity of the survey line 2 in each direction is small, and the decay percentages of 56, 75 and 70% are smaller ...
WhatsApp: +86 18221755073
Determination of Safe Distance While Blasting at Open Pit Mine …
There are considered the aspects of stability of Muruntau open pit edges and complex of high-angle conveyor KNK-270 during the interconnection of possible seismic loads and dynamic loads, which ...
WhatsApp: +86 18221755073
Determination of Safe Distance While Blasting at Open …
In Figure 1., there is shown the appearance of the open pit mine Zabrdica in the vicinity of Valjevo. Fig. 1 Open pit Zabrdica in the vicinity of Valjevo Shots with all carried out blasting operations have been distributed in several rows with the dip of 80 has been 3,0-3,3 m while the distance among rows has been 2,8-2,9 m.
WhatsApp: +86 18221755073
Research on Blasting Technical Scheme of Hillside Open-Pit Mine …
In order to reduce the large rocks produced by blasting of hillside open-pit mine with heterogeneous and complex rock mass in arid area, based on the lithology characteristics of complex rock mass ...
WhatsApp: +86 18221755073
Controlled blasting in an open-pit mine for improved …
The use of presplitting with the blasting programme for an open-pit copper mine produced a significant improvement in the soundness of the final slope face. As a result of the increased quality of the cut slopes, the mine management were able to adopt 20 m high benches with a steep overall slope angle of 60".
WhatsApp: +86 18221755073
Study on Blasting Technology for Open-Pit Layering of …
Jianshan open-pit was 0–3.6m, but the blasting did not cause overall damage to the adjacent high and steep slopes. In the future, this model can be used to predict rock damage caused by subsequent blasting. Keywords: open-pit mine, high and steep slope, blasting technology, blasting vibration, numerical simulation INTRODUCTION
WhatsApp: +86 18221755073
Controlled blasting for long term stability of pit-walls
In the process of open-pit and underground mining, the seismic wave generated by open-pit blasting can influence the stability of the surrounding rock masses on a roadway. It is easy to destabilize the surrounding rock, which seriously affects the stability of the roadway and the safety of the underground mining operation.
WhatsApp: +86 18221755073
Understanding the connection between blasting and …
There are a number of controlled blasting techniques that can be implemented to improve highwall stability. These include line drilling, smooth wall …
WhatsApp: +86 18221755073
Study on Three-Dimensional Dynamic Stability of Open-Pit High …
The propagation process of blasting vibration has always been a difficult problem affecting the stability of high slopes in open-pit mines. Taking the Jianshan Phosphorus Mine as the research background, combined with engineering geological investigation, field blasting test, blasting vibration monitoring, numerical simulation …
WhatsApp: +86 18221755073
Stability assessment and feature analysis of slope in Nanfen Open Pit …
Introduction. As the mining method is turning from open pit mining to sag by mining, vertical height of open-pit mine slope continues to increase, the slope deformation and failure mode has close relationship with regional geological structure characteristics and the rock mass structure feature, the stability is influenced largely by rock mass, …
WhatsApp: +86 18221755073
Non-structural fracture blasting technique and case study of open pit …
Taking limestone hillside open-pit mine in Dabancheng, Hongshun, Xinjiang as the target area, focusing on the technical problems in the blasting site, and through repeated blasting experiments ...
WhatsApp: +86 18221755073
Determination of Safe Distance While Blasting at Open …
In Figure 1., there is shown the appearance of the open pit mine Zabrdica in the vicinity of Valjevo. Fig. 1 Open pit Zabrdica in the vicinity of Valjevo Shots with all carried out blasting operations have been distributed in several rows with the dip of 80 has been …
WhatsApp: +86 18221755073
Controlled blasting (pre-splitting) at an open-pit mine in …
An attempt has been made to examine the impact of blast vibration, joint frequency and relative joint orientation to the pre-split blasting at Rampura-Agucha Pb-Zn open pit mine of Hindustan Zinc ...
WhatsApp: +86 18221755073