scholarly journals Assessment of Blasting-Induced Ground Vibration in an Open-Pit Mine under Different Rock Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Zhi-qiang Yin ◽  
Zu-xiang Hu ◽  
Ze-di Wei ◽  
Guang-ming Zhao ◽  
Ma Hai-feng ◽  
...  
Keyword(s):  
Rock Mass ◽  
Ground Vibration ◽  
Open Pit Mine ◽  
Vibration Monitoring ◽  
Open Pit ◽  
Blasting Vibration ◽  
Vibration Frequencies ◽  
Rock Masses ◽  
Vibration Signals ◽  
Modified Equation

In an open-pit mine slope, rock mass has multiple joint structures and blasting operations have an obvious influence on its stability. Therefore, accurately predicting the blasting vibration is necessary to ensure slope stability. In this study, the blasting vibration signals monitored at a blasting site with different rock masses were used to investigate the attenuation characteristics of blasting vibration through the peak particle velocity (PPV), frequency characteristics, and energy distribution of the blasting vibration signals analyzed with the time-frequency processing method. The results demonstrated that the main vibration frequency of the blasting vibration of dolomite was wider than that of shale, and these main vibration frequencies occurred at 25 kHz and 14 kHz for dolomite and shale, respectively, at a distance of 50 m from the blast area to the vibration monitoring point. With an increase in the distance from 50 m to 200 m, the main vibration frequencies decreased to less than 5 Hz. With increasing joint degree, the attenuation rate of the vibration velocity and energy attenuation of the blasting vibration increase, indicating that the structural parameters of the rock mass (such as the number of joints) have a significant impact on the attenuation law of blasting vibration. Furthermore, a modified equation that can be used for predicting PPV was developed by considering the effect of the number of joints in the rock mass on the blasting vibration. For the same ground vibration readings, the correlation factor increased from 0.8 to 0.85 for the Nicholls-USBM equation and the modified equation, respectively. The PPV of blasting under different rock masses of the Baideng open-pit phosphorite mine was used to verify the modified equation. The results show that a modified equation can be used for predicting the PPV of blasting engineering in the Baideng phosphorite mine and that the prediction accuracy is acceptable.

Prediction of the Ground Vibration Rate during Large-scale Explosions in the Underground Conditions

2021 ◽  
pp. 41-45
Author(s):  
V.N. Tyupin ◽  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Underground Mining ◽  
Calculated Data ◽  
Ground Vibration ◽  
Open Pit ◽  
Vibration Velocity ◽  
Earth Surface ◽  
Seismic Safety ◽  
The Earth

At present, to ensure seismic safety in massive explosions, the analytical dependence of the determination of the vibration velocity of M.A. Sadovsky rock mass is mainly used. This dependence is widely used in the creation of seismic-safe technologies for mineral deposits open-pit and underground mining. However, scientific research and production experience showed that the rate of oscillation depends on the energy parameters of the explosive, the diameter and length of its charges, the number of simultaneously exploded charges, the number of deceleration stages, the deceleration interval, etc. The purpose of this article is to predict the speed fluctuations of the massif on the earth surface when conducting the underground explosions depending on the parameters of large-scale explosions and physical-technical properties of the rock masses in the areas of explosion of the protected object. The formulas for calculating the velocity of rock mass on the earth surface during large-scale explosions in the underground conditions are substantiated and presented. The formulas were used for calculating the vibration velocities of the rock mass on the earth surface in accordance with the parameters of drilling and blasting operations during large-scale explosions in the mines of GK VostGOK. Comparison of theoretical (calculated) data and the results of actual measurements indicates their convergence. By changing the controlled parameters in the calculation formulas, it is possible to quantitatively reduce the seismic effect of a large-scale explosions on the protected objects. Further research will be aimed at studying the influence of tectonic faults, artificial contour crevices, filling massif or mined-out space on the rate of seismic-explosive vibrations during blasting operations in the mines. The research results can be used in the preparation of rules for conducting large-scale explosions at the underground mining.

Drilling rate prediction of an open pit mine using the rock mass drillability index

2015 ◽  
Vol 73 ◽  
pp. 130-138 ◽  
Author(s):  
Mohammad Ataei ◽  
Reza KaKaie ◽  
Mehdi Ghavidel ◽  
Omid Saeidi
Keyword(s):  
Rock Mass ◽  
Open Pit Mine ◽  
Open Pit ◽  
Drilling Rate ◽  
Rate Prediction

Landslide stabilization experience in Urtui open pit mine

2021 ◽  
pp. 102-106
Author(s):  
O. A. Isyanov ◽  
◽  
D. I. Ilderov ◽  
V. I. Suprun ◽  
S. A. Radchenko ◽  
...  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Geological Structure ◽  
Stability Control ◽  
Open Pit Mine ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Seams ◽  
Mining Operations ◽  
Early Access

Instability of pit wall slopes is the most critical accident in open pit mining. The risk of damages to pit walls is proportional to the height of exposed surfaces and to the time of exposure. Among many factors governing pit wall stability, the major factor is geological structure and weakening zones in rock mass. Deformation processes are initiated in host rock mass of coal seams mostly because of undercutting of weak interlayers. Alongside with local undercutting, another cause of landslides is transition of coal mining from down-dip extraction to up-dip extraction. The sequence of mining and morphology of weak interlayers also have influence on initiation and evolution of deformations. The basic component of engineering solutions on pit wall stability control is optimization of mining sequence and methods of accessing working horizons in open pit mines. Large-scale deformation of Western and Southeastern pit walls in Urtui mine could be avoided using the optimized sequence of mining operations. For example, mining advance mostly along the curve of the Urtui centroclinal fold, with early access and destress of the eastern and, first of all, western wings of the fold could make it possible to evade from up-dip mining of coal seams and, as a consequence, to solve the major geomechanical problems in the open pit mine.

EVALUA TION OF DUST EMISSIONS DURING TRANSPORTA TION OF ROCK MASS AT DEPOSITS DEVELOPED OPEN PIT MINE

2020 ◽  
Vol 2 (1) ◽  
pp. 78-87
Author(s):  
S.V. KOVSHOV ◽  
◽  
A.V. PASYNKOV ◽  
Keyword(s):  
Rock Mass ◽  
Comprehensive Analysis ◽  
Open Pit Mine ◽  
Dust Control ◽  
Open Pit ◽  
Dust Formation ◽  
Dust Suppression ◽  
Dust Emissions ◽  
Opencast Mine ◽  
Dump Trucks

The issues of dust formation and dust suppression in quarries during transportation of rock mass are considered. Foreign and Russian techniques and methods of dust control in open pit mine are analyzed. The limit number of equipment units for the Noyon-Tologoi opencast mine is established, and the dependence of the gross emission of inorganic dust on the number of dump trucks is determined. As a result of a comprehensive analysis, dust suppression methods for a polymetallic open pit mine are proposed.

scholarly journals Back Analysis and Calculation of Dynamic Mechanical Parameters of Rock Mass with Measured Blasting Vibration Signals

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Zhaowei Yang ◽  
Wenbo Lu ◽  
Qidong Gao ◽  
Peng Yan ◽  
Ming Chen ◽  
...  
Keyword(s):  
Rock Mass ◽  
Elastic Modulus ◽  
Blasting Vibration ◽  
Dynamic Parameters ◽  
Improved Method ◽  
S Wave ◽  
Vibration Signals ◽  
S Waves ◽  
Measured Field ◽  
Wave Identification

How to obtain dynamic parameters of rock masses quickly and precisely is a popular and difficult problem, which plays a very important part in engineering design or construction. Currently, the methods used to obtain these parameters are in situ testing method, empirical formula, and so on. However, these methods have some shortcomings, such as large investment and long construction period, which cannot obtain the dynamic parameters precisely and quickly in the engineering scale. In this study, a new method of estimating the rock parameters based on the measured field blasting vibration signals is proposed according to theory of elastic stress wave. In addition, an improved method for S-wave identification used in engineering scale was proposed and then the numerical simulation is given to verify the feasibility. Comparison of the numerical identification results and theoretical results clearly show that the improved method is available in S-wave identification with errors less than 2%. By identifying the arrival times of P and S waves, the propagation velocities of P and S waves are calculated and the parameters of rock mass can be obtained at last. Through analyzing the measured field blasting vibration signals in Fengning pumped-storage power station, the dynamic elastic modulus of rock mass inversed by vibration signals is about 2.2~2.9 times of its static elastic modulus, while the inversed dynamic Poisson's ratio is 0.9~0.975 times of the static.

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