Experiment Study on Decreasing Blasting Vibration Adopting Large Diameter Hole-by-Hole Initiation

2011 ◽  
Vol 301-303 ◽  
pp. 1556-1559
Author(s):  
Ren Shu Yang ◽  
Yu Long Che ◽  
Guo Liang Yang ◽  
Chuan Huo
Keyword(s):  
Effective Means ◽  
Large Diameter ◽  
Test Method ◽  
Mine Safety ◽  
Open Pit ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Open Pit Mines ◽  
Diameter Hole ◽  
Vibration Damage

Blasting vibration damage is a major factor in mine safety. Millisecond blasting is an effective means to reduce blasting vibration damage. Taking field test method to study high slope deformation in open pit mines a little bit difference of each quick-fried bore blows up’s blasting vibration damage. Research found that, taking a little bit difference of each quick-fried bore blows up, Slope’s vibration velocity is 0.6cm/s, Compared to initiation by row’s theoretical value reduced by 58.33% , a little bit difference of each quick-fried bore blows up is an effective means to reduce blasting vibration damage, it is great significance for improving the slope stability.

scholarly journals A Preliminary Study on the Design Method for Large-Diameter Deep-Hole Presplit Blasting and Its Vibration-Isolation Effect

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Shuangshuang Xiao ◽  
Hongsheng Wang ◽  
Guowei Dong
Keyword(s):  
Vibration Isolation ◽  
Design Method ◽  
Blast Hole ◽  
Large Diameter ◽  
Field Testing ◽  
Open Pit ◽  
Vibration Velocity ◽  
Deep Hole ◽  
Charge Mass ◽  
Presplit Blasting

Presplit blasting can reduce vibration and back impact induced by cast blasting, thus resulting in a smooth bench slope. To design reasonable presplit blasting parameters, this research investigated the formation of presplit faces based on the explosion mechanics and revealed the cracking mechanism of presplit blasting. According to the stress distribution in the vicinity of the blast holes under the action of explosive stress waves and blasting gas, we deduced theoretical formulae for parameters including charge mass in blast holes, hole spacing, and distance from presplit blast holes to cushion holes. On this basis, a method was proposed for the design of large-diameter deep-hole presplit blasting. Field testing was conducted by setting different spacing for presplit blast holes, to monitor the blasting-induced vibration. The results showed that appropriate hole spacing can reduce the particle vibration velocity and the attenuation index of blasting-induced vibration changed slightly while the attenuation coefficient decreased significantly; the formed presplit faces were smooth and had a high half-cast factor. Finally, the reasonable hole spacing for presplit blasting, distance from presplit blast hole to the cushion hole, and the charge mass in blast holes in the Heidaigou open-pit coal mine were determined, respectively.

Damage Analysis on a Frame Structure under Repeatedly Blasting Vibration

2010 ◽  
Vol 163-167 ◽  
pp. 3214-3218
Author(s):  
Wen Hui Tan ◽  
Miao Yu ◽  
Peng Fei Zhang
Keyword(s):  
Damage Mechanics ◽  
Continuous Medium ◽  
Damage Model ◽  
Conventional Technique ◽  
Frame Structure ◽  
Open Pit ◽  
Blasting Vibration ◽  
Structural Members ◽  
Open Pit Mines ◽  
Theory Of Damage

Blasting is a conventional technique for mining, but structures adjacent to open pit mines are often damaged by blasting vibration, therefore, durability and safety of these structures are affected. Damage characteristics of a three-floor frame structure on the top of an open pit mine under repeatedly blasting vibration is studied in this paper. The damage model of structural members is made based on the theory of damage mechanics of continuous medium, and an overall damage model of the structure is also established by the method of frequency. The results showed that the Young’s modulus, frequency of the structure decreased as increasing of the blasting times, the damage factors of structural members are bigger than that of the structure; the strength of the structure decreased greatly under repeatedly blasting vibration, the strength of the structure is low. The durability of structures is affected, but the structure will not collapse. The research is helpful for blasting control in open pit mines and design on structures adjacent to open pit mines.

scholarly journals Vibration Safety Criteria for Surficial Rock Mass of Open Pit Slope Affected by Underground Mining Blasting Operations

2017 ◽  
Vol 11 (1) ◽  
pp. 627-637 ◽  
Author(s):  
Nan Jiang ◽  
Chang Xiong ◽  
Chuanbo Zhou ◽  
Xuedong Luo ◽  
Shiwei Lu ◽  
...  
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Ultimate Tensile Stress ◽  
Stress Waves ◽  
Open Pit ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Stress Criterion ◽  
The North ◽  
South Slope

Introduction: Blasting vibration velocity is an important index to evaluate the stability of mine slopes under blasting operations. Objective: In order to determine the blasting vibration safety criteria for slope rock mass scientifically and reasonably, the influence of stress waves on surficial rock mass of mine slopes was analyzed when stress waves propagate to the slope surface, and mathematical models for blasting vibration safety criteria are proposed based on the ultimate tensile stress criterion, the ultimate shear stress criterion and the Mohr-Coulomb criterion. Results and Conclusion: Combined with the field blasting operations during the open-pit to underground mining in Daye iron mine, the blasting vibration safety criteria is calculated. It is obtained that the blasting vibration safety criteria for the north slope and the south slope are 11.08cm/s and 10.20cm/s respectively. The results agree well with the Safety Regulations for Blasting in China and provide a reference to determine blasting vibration safety criteria for other similar projects.

scholarly journals A New Mathematical Model for Predicting the Surface Vibration Velocity on the Step Topography

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Xu Wu ◽  
Qifeng Guo ◽  
Yunpeng Zhang
Keyword(s):  
Mathematical Model ◽  
Measured Data ◽  
Open Pit ◽  
Vibration Velocity ◽  
Amplification Coefficient ◽  
Blasting Vibration ◽  
Attenuation Effect ◽  
Amplification Effect ◽  
Propagation Law ◽  
Terrain Effect

In order to control production blasting and optimize mining operation, it is important to study the step topography vibration amplification and attenuation effect in the open-pit mine. Surface particle vibration velocity attenuation characteristics, the formation, and change rules of the terrain effect were studied by analyzing the field measured data. Results show that local amplification effect and local attenuation amplification effect of particle vibration velocity are obvious. Amplification effect associates with bench height, and the attenuation effect is closely related with the distance from the vibration source and distance from the top. With the increase of elevation, vibration magnification of the particle on the top was 1.1∼1.4. Because of the influence of the terrain effect, particle vibration velocity on the slope toe was obviously inhibitory. Based on the measured data, elevation amplification factor and clamping effect factor which influence blasting vibration velocity are put forward, and a new mathematical model considering the attenuation coefficient, the elevation amplification coefficient, and the clamping effect coefficient for predicting the blasting vibration velocity of the step topography is further improved. The regression analysis results show that the fitting coefficient of determination of the new prediction model is 0.8152 in horizontal and 0.8902 in vertical, respectively, and the prediction error is less than 20%, which is much better than other formulas. This new model provides effective reference for blasting seismic wave propagation law research of slope engineering.

Mining technologies at Polyus Krasnoyarsk

2020 ◽  
pp. 30-33
Author(s):  
L. F. Skorik ◽  
◽  
V. A. Karpov ◽  
I. N. Timofeev ◽  
A. I. Ptashnik ◽  
...  
Keyword(s):  
Rock Mass ◽  
Slope Stability ◽  
Numerical Models ◽  
Stability Control ◽  
High Rate ◽  
Mine Safety ◽  
Open Pit ◽  
Wave Impact ◽  
Open Pit Mines ◽  
Research Activities

The article discusses mining efficiency and the related research activities at Polyus Krasnoyarsk. Olimpiada and Blagodat gold fields feature difficult geological, hydrological and geotechnical conditions. Sustainable mining at high rate and high output requires permanent scientific, engineering and design support and supervision. In this regard, the integrated and fruitful efforts are persistently undertaken to improve performance of drilling and blasting, including minimization of seismic and shock wave impact on rock mass beyond the perimeter blast holes, optimization of size grade composition of blasted rock pile, and determination of displacement vector of rocks in muck pile using appropriate instrumentation and software. Furthermore, modification and upgrading of drainage systems and slope stability control is always in process in Olimpiada open pit mines. Polyus Krasnoyarsk engages itself with refining of information on geomechanics and hydrogeology of gold ore bodies. The purpose of these activities is to determine and amend the parameters of ore body occurrence, morphology of faulting, rock contacts and folding structures in rock mass, physical and mechanical properties of rocks, as well as hydrogeological conditions, with updating of the numerical models. Such information at hand ensures mine safety and enables safe and economically efficient decision-making on spoil bank design to provide the required slope stability in open pit mines.

Analysis of Efficiency of Drilling of Large-Diameter Wells With a Profiled Wing Bit / Badania Efektywności Wiercenia Studni Wielkośrednicowych Świdrem Skrawającym z Profilowanymi Skrzydłami

2012 ◽  
Vol 57 (2) ◽  
pp. 363-373
Author(s):  
Jan Macuda
Keyword(s):  
Average Rate ◽  
Large Diameter ◽  
Open Pit ◽  
Mechanical Parameters ◽  
Drilling Rate ◽  
Geological Conditions ◽  
Rock Drillability ◽  
Drilling Technology ◽  
Weight On Bit ◽  
Rotary Speed

Abstract In Poland all lignite mines are dewatered with the use of large-diameter wells. Drilling of such wells is inefficient owing to the presence of loose Quaternary and Tertiary material and considerable dewatering of rock mass within the open pit area. Difficult geological conditions significantly elongate the time in which large-diameter dewatering wells are drilled, and various drilling complications and break-downs related to the caving may occur. Obtaining higher drilling rates in large-diameter wells can be achieved only when new cutter bits designs are worked out and rock drillability tests performed for optimum mechanical parameters of drilling technology. Those tests were performed for a bit ø 1.16 m in separated macroscopically homogeneous layers of similar drillability. Depending on the designed thickness of the drilled layer, there were determined measurement sections from 0.2 to 1.0 m long, and each of the sections was drilled at constant rotary speed and weight on bit values. Prior to drillability tests, accounting for the technical characteristic of the rig and strength of the string and the cutter bit, there were established limitations for mechanical parameters of drilling technology: P ∈ (Pmin; Pmax) n ∈ (nmin; nmax) where: Pmin; Pmax - lowest and highest values of weight on bit, nmin; nmax - lowest and highest values of rotary speed of bit, For finding the dependence of the rate of penetration on weight on bit and rotary speed of bit various regression models have been analyzed. The most satisfactory results were obtained for the exponential model illustrating the influence of weight on bit and rotary speed of bit on drilling rate. The regression coefficients and statistical parameters prove the good fit of the model to measurement data, presented in tables 4-6. The average drilling rate for a cutter bit with profiled wings has been described with the form: Vśr= Z ·Pa· nb where: Vśr- average drilling rate, Z - drillability coefficient, P - weight on bit, n - rotary speed of bit, a - coefficient of influence of weight on bit on drilling rate, b - coefficient of influence of rotary speed of bit on drilling rate. Industrial tests were performed for assessing the efficiency of drilling of large-diameter wells with a cutter bit having profiled wings ø 1.16 m according to elaborated model of average rate of drilling. The obtained values of average rate of drilling during industrial tests ranged from 8.33×10-4 to 1.94×10-3 m/s and were higher than the ones obtained so far, i.e. from 181.21 to 262.11%.

Management and engineering solutions to improve stripping equipment efficiency in Chernogorksy open pit mine

2018 ◽  
pp. 36-48
Author(s):  
G. N. Shapovalenko ◽  
S. N. Radionov ◽  
V. V. Gorbunov ◽  
V. A. Khazhiev ◽  
V. Yu. Zalyadnov ◽  
...  
Keyword(s):  
Open Pit Mine ◽  
Open Pit ◽  
High Concentration ◽  
Open Pit Mines ◽  
Blasting Operation ◽  
Internal Dump ◽  
Mining Conditions ◽  
Mining Front ◽  
Comparison Of Equipment

Chernogosky open pit mine integrates truck-and-shovel system of mining with overburden rehandling to internal dump with a set of walking excavators for rehandling of overburden to mined-out area of the pit. It is possible to improve efficiency of stripping in the conditions of Chernogorsky OPM by reducing percentage of stripping with more expensive handling system. The relevant research and solutions to this effect are presented in this article. Comparative characterization of mining conditions and parameters of mining systems applied is given for open pit mines Chernogorsky, Turnui, Nazarovsky, Vostochno-Beisky and Izykh. The comparative analysis points at the need to account for difficulty of mining and process sites in comparison of equipment productivity. High concentration of mining machines, which is conditioned by narrow mining front and simultaneous operation of five faces, as well as blasting operation implemented every 1-2 days, are recognized as the main constraints of excavator capacity in mining with direct dumping in Chernogorsky open pit mine. The management and engineering solutions implemented in the mine and resulted in higher efficiency of draglines are described.

MECHANICAL/HYDRAULIC ENGINEERING IN RECLAMATION OF OPEN PIT MINES

2018 ◽  
Vol 5 ◽  
pp. 59-64
Author(s):  
P.A. Prokhorov ◽  
◽  
Val.V. Sencus ◽  
A.L. Mansurov ◽  
◽  
...  
Keyword(s):  
Hydraulic Engineering ◽  
Open Pit ◽  
Open Pit Mines
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