Basic trends in development of drilling equipment for ore mining with block caving method

Еременко, В. А.; Karpov, V. N.; Timonin, Vadim; Barnov, N. G.; Shakhtorin, I. O.

doi:10.1134/s106273911506037x

Cited by 14 publications

(4 citation statements)

References 2 publications

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“…Chiang and Stamm [13] presented a nonlinear dynamic model to compute the hammer performance, and the results were in agreement with the predicted values. Eremenko et al [14] determined the causes of performance drop in induced block caving using fans of two types of the hammer and discussed alternatives of improvement in drilling efficiency. Kim et al [15,16] developed a pneumatic dynamic model of DTH hammer to predict drilling performance and validated the model through laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Sun

et al. 2021

Shock and Vibration

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Although pneumatic down-the-hole (DTH) hammers have good performance of high penetration rate and minimal deviation tendency in the vertical section of oil and gas wells, they have not been successfully used in directional drilling due to drill tool wear and wellbore disturbance. Herein, we developed a novel type of pneumatic DTH hammer with a self-propelled round bit to overcome the technical difficulties of directional drilling. Nonlinear dynamic modeling developed by the authors was used to analyze the working principle and performance of the novel DTH hammer. The kinematics and dynamics simulation of this hammer were carried out using MATLAB language, and the motion law of the piston was revealed. The performance of the novel hammer was numerically simulated and evaluated by considering fluctuations of the front and rear chamber pressure, impact energy, acceleration, and frequency. The results show that our novel DTH hammer’s working principle is feasible and has an adequate structural design. The simulation results demonstrate reasonable design parameters. Compared to the numerical results for conventional DTH hammers, the velocity and acceleration of the piston of the novel hammer changed smoothly. The frequency was slightly higher than that of conventional hammers, while other parameters were nearly equal. The novel DTH hammer can be used in directional drilling, trenchless drilling, and seabed sampling drilling.

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Section: Introductionmentioning

confidence: 99%

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Sun

et al. 2021

Shock and Vibration

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“…The block caving method is commonly used in underground mining, and the depth of upward blast holes has reached more than 40 m to improve the mining efficiency. The underground mining emulsion explosives not only should satisfy the fluidity for the pumping process but also ensure the adhesion after injecting into the blast hole [4]. However, the fluidity and adhesion of emulsion explosives are mutually restrictive under normal conditions.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of a Novel Underground Mining Emulsion Explosive Containing Thickening Microcapsules

Chen

Cheng

Fang

et al. 2020

Propellants Explo Pyrotec

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In order to solve the sloughing problem of explosives in upward blast holes, a novel underground mining emulsion explosive with thickening microcapsules was developed. The microcapsules in the emulsion explosive would be damaged by high-speed shearing at the moment of entering the blast hole, releasing their internal thickening agents to the emulsion explosive in the blast holes. These thickening agents were evenly distributed with a linear network structure in the emulsion explosive to make it thickened in the hole. The microcapsules were spherical and could encapsulate the thickening agent effectively, and the viscosity of the emulsion matrix with 2 mass % of them was close to that of the reference emulsion matrix at ca. 127.9 Pa s. Experimental results of TG-DSC and detonation performance showed that the novel underground mining emulsion explosive had a good thermal stability and its detonation velocity was 5133 m s À 1 and still up to 4618 m s À 1 after storing at the temperature of À 20°C for 12 h. The novel underground mining emulsion explosive with thickening microcapsules not only achieved the goal of thickening in the blast holes, but also had excellent detonation performance and low-temperature resistance capability.

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“…Caving mining method has been widely used in metal mines around the world. Approximately 25% of mines worldwide use this method [ 1 ]. Also, more than 85% of iron ores and approximately 40% of non-ferrous metal ores in underground mines are mined out using this method in China [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the caved rock zones’ scope induced by caving mining method

et al. 2018

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Critical medium column theory has typically been used to predict the scope of caved rock zone (CRZ) caused by caving mining method. It is essential to understand the distribution laws of lateral pressure induced by caving mining method with different dipping angles. In this study, a self-designed scaled physical model was used to investigate the distribution laws with angles ranging from 80° to 90°, and ore drawing was employed in experiments to simulate caving mining method. The experimental results indicated that the distribution laws were divided into the reductive region and the extensive region during ore drawing. The reductive region was close to the drawing hole, and its scope was smaller than the other part. Moreover, decreasing the dipping angle was an effective way of controlling the maximum reduction rates and the scope of reductive region. By varying laws of lateral pressure, the predictive model of CRZs’ scope was established. Additionally, the rock mass located outside the predictive CRZs’ scope did not rupture based on the monitoring of Digital Optical Televiewing (OPTV), which was verified by the field test in Dabeishan Iron Mine, China. The results of the field test demonstrated that the prediction method used in this study was valid and could be used in practice.

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Basic trends in development of drilling equipment for ore mining with block caving method

Cited by 14 publications

References 2 publications

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Design Optimization and Performance Analysis of the Pneumatic DTH Hammer with Self‐Propelled Round Bit

Fabrication and Characterization of a Novel Underground Mining Emulsion Explosive Containing Thickening Microcapsules

Prediction of the caved rock zones’ scope induced by caving mining method

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