A Comprehensive Evaluation Method of Bench Blast Performance in Open-Pit Mine

Liu, Mingqing; Liu, Jun; Zhen, Mengyang; Zhao, Futian; Xiao, Zhimin; Shan, Pengfei; Wang, Yue; Ou, Chen; Zheng, Haowen; Lei, Zheng

doi:10.3390/app10165398

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…Blast waves have different characteristics that can be extracted using Fourier transform [27], wavelet transform, and fractal analysis [28][29][30]. The wavelet wave signal decomposition is used to derive the wavelet coefficients.…”

Section: Methodsmentioning

confidence: 99%

Digital Processing of Seismic Data from Open-Pit Mining Blasts

Koteleva

Frenkel

2021

Applied Sciences

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This article describes an approach of mathematical processing of signals (seismograms) from five blasthole charges from experimental blasting, each 3 m deep, with equal explosive weight (1 kg), and equidistant (3 m) from one other. The seismic explosive waves were measured at a 13 to 25 m distance. This article provides spectral analysis, wavelet analysis, and fractal analysis results. It defines the dependence of dominant frequency and amplitude on the distance to the blast center. According to the experimental data, the dominant frequency is calculated as y = 1.0262x0.2622 and the amplitude dependency as y = 18.139x−2.276. Furthermore, the analysis shows that 80% of the entire signal is concentrated in half the area of frequency range, i.e., the low frequency zone is of the most interest. This research defines the dependence of distance on the energy value of signal wavelet analysis. It is demonstrated that, according to the experimental data, the 12th frequency range is closely correlated with the distance values. This article gives the definitions of entropy, correlation dimension, and predictability time. This experiment shows that entropy and correlation dimension decrease but predictability time increases when the distance to the blast center increases. This article also describes the method for determining optimal drilling and blasting parameters, and concludes with the possibility of applying the analytical results to predicting and enhancing drilling and blasting operations.

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Section: Methodsmentioning

confidence: 99%

Digital Processing of Seismic Data from Open-Pit Mining Blasts

Koteleva

Frenkel

2021

Applied Sciences

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“…A well selected pattern would produce fragmentation that can be accommodated by available loading and hauling equipment and crushing plant with little or no need for secondary blasting. Therefore, it is a well acknowledged fact that the performance of mining operations such as excavation and crushing reeves on fragmentation has been pre-conditioned by blast designs [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Examining the Effect of Powder Factor Variability on Granite Productivity

Kareem Salati,

Shola Adeyemo

2023

Recent Advances in Mineralogy

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This research seeks to examine the effect of powder factor variability on granite productivity during its quarrying. Schmidt hammer was used for the in-situ determination of rock hardness. Uniaxial compressive strength (UCS) of in situ rock was estimated from the values obtained from Schmidt hammer rebound hardness test and its density determined from laboratory test. After preliminary field studies, ten (10) blasts with varied powder factors were studied and their overall effects on granite productivity examined. Three (3) rock samples were carefully collected from the quarrying site and subjected to laboratory analysis for UCS and bulk density tests. With spacing and burden kept between 1.7 m and 1.8 m and stemming height also varied between 1.5 m and 2 m, charge columns of between 4.5 m to 6.5 m were maintained, while number of holes drilled per blast was between 64 and 88. Results obtained from the test revealed that the average UCS of the granite samples was 80.67 MN/m2 while the average bulk density was 2465.67 kg/m3. Therefore, considering ten (10) blasts with varied powder factors of between 0.77 kg/m3 and 0.97 kg/m3, total volumes of rock of between 1109.76 m3 and 2280.96 m3 was produced. Hence, varied powder factors have been found to have varying effects on rock fragmentation sizes and by extension, granite productivity.

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“…In addition, large open-pit mines in China are mainly located in remote areas such as Xinjiang and Inner Mongolia, where the ecological environment consists mostly of fragile Gobi or grasslands [3], and the open-pit mining operations [4] have caused large-scale damage to the geological structure and vegetation in these areas [5,6]. In the past 10 years, the large-scale development and construction of open-pit coal mines has caused the destruction of surface vegetation [7], exacerbated desertification in mining areas, and accelerated the degradation of local ecosystems [8,9].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Land Saving and Loss Reducing and Slope Stability Variation Patterns in Open-Pit Mine

Guo

Zhou

et al. 2021

Geofluids

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This study presents different land saving and loss reducing schemes. Comprehensively compare the economic benefits of the schemes. It is shown that the optimal scheme can recover tons of coal resources on the south slope, creating significant economic benefits. Numerical simulation was utilized to analyze the changes of slope stability, deformation, and shear strain increment in the process of land saving and loss reducing. Results found that the slope stability decreases rapidly, and the toe of the slope has to be internally discharged in time to compress the slope. Timely follow-up of in-slope rows can improve slope stability. The position of the slope shear exit changes with the increase of the distance of the inner row, and its stability increases gradually. When the distance of the lower inner row exceeds 120 m, the increase of the internal row distance has little influence on the slope stability. When the inner distance exceeds 60 m in the process of internal dumping of upper platform, the position of potential sliding plane gradually changes from the lower dump to the upper and lower dump with the increase of inner dumping distance. It shows that the stability of the dump will be damaged if the upper dump continues to be discharged. Therefore, the distance between the upper and lower dump sites is more important than 60 m. The stability of the south slope is good in the process of mining and internal drainage, and the overall stability of the south slope is controllable, based on slope radar monitoring.

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A Comprehensive Evaluation Method of Bench Blast Performance in Open-Pit Mine

Cited by 8 publications

References 15 publications

Digital Processing of Seismic Data from Open-Pit Mining Blasts

Digital Processing of Seismic Data from Open-Pit Mining Blasts

Examining the Effect of Powder Factor Variability on Granite Productivity

Optimization of Land Saving and Loss Reducing and Slope Stability Variation Patterns in Open-Pit Mine

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