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 ...

In addition, when using interval charging, the blasting vibration of the 13-meter step decreases to 1.775 cm/s at 150 m, which is less than the safe vibration …

Mine Health and Safety Act 29 of 1996 and Reguations. Capte Town: Republic of South Africa, Government Gazette. Monjezi, M., Amini Khoshalan, H. & Yazdian Varjani, A., 2010. Prediction of flyrock and backbreak in open pit blasting operation: a neuro-genetic approach. Arabian Journal of Geosciences, 5(3), pp. 441-448.

Based on the blasting technology in the south region in Anqian open-pit mine, a generalized three-dimensional bench blasting model with 3 rows and 21 bore holes is set up, and the complete process ...

First, the insufficiencies of Sadov's formula under the condition of group-hole blasting in an open-pit mine are analyzed. A theoretical derivation method for modifying the maximum charge coefficient is proposed. ... the safety distance problem of the grouting curtain in blasting construction is solved using the modified Sadov's formula ...

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 …

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 ...

The primary aim of every twenty-first century mining operation is to extract as much ore as possible in a safe and economical manner. Failure in mine excavation occurs when the shear stress acting on the rock is greater …

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 ...

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 ...

The long-term repetitive blasting vibration had long-term cumulative damage effect on the slope stability of Xiaolongtan Open-pit Coal Mine, because it adopted blasting as the principal instrument ...

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

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 …

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 ...

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 ...

As the key technology of high-step stripping and blasting engineering, throwing blasting will be the development trend of the production optimization and benefit maximization of the open-pit mine in the future. In order to break with the research idea of optimizing the cast blasting effect by improving the effective throwing rate for a long …

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 …

Zhu et al. [10] proposed a new method to predict the vibration velocity of multi-hole trenching blasting of laminated rock masses, which can be used for optimizing engineering blasting design and ...

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 ...

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 ...

In open pit mines, the blasting operation should be effectively optimized at the lowest possible total cost, providing technical specifications and the required safety norms.

A large number of burnt rocks in some open-pit mines in Xinjiang, Inner Mongolia and Ningxia have a great influence on the blasting effect. For this kind of rock, through the analysis of physical and chemical changes, combined with ANSYS/LS-DYNA and PFC 2D numerical simulation software, a burnt rock model with multiple joint cracks …

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 …

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

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 ...

Abstract. In open pit mines, the blasting operation should be effectively optimized at the lowest possible total cost, pr oviding. technical specifications and the required safety norms. The ...

There are a number of controlled blasting techniques that can be implemented to improve highwall stability. These include line drilling, smooth wall …

Drilling and blasting play vital roles in opencast mining. These operations not only affect the cost of production directly but as well and significantly, the overall operational costs.

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.

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 …