A Comparison of the Seismic Effects of Different Blasting Types Executed During the Longwall Mining of a Coal Seam

Wojtecki, Łukasz; Gołda, Iwona

doi:10.1134/s1062739120060071

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…In addition to casualties, these disasters often also cause property damage such as roads, houses, and vehicles. Effective prevention and treatment of slope disasters are essential to promote social and economic development and protect people's life and property safety [1,2]. Slope monitoring is an important means to understand the development of slope disasters and the causes of disasters.…”

Section: Introductionmentioning

confidence: 99%

UAV Tilt Photography Control for Numerical Simulation of High and Steep Rock Slopes

Wang

Zhou

Wang

2023

Journal of Control Science and Engineering

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In order to provide accurate image information for the analysis and treatment of dangerous rocks and rockfalls during the early investigation, a UAV tilt photography control method for numerical simulation of high and steep rock slopes is proposed. Based on the UAV tilting photography technology, the slope section was obtained through a real 3D modeling and poststage point cloud data processing. Numerical simulation is used to study the motion characteristics of dangerous rock falling in a high and steep slope of a railway station. This essay introduces the application of a UAV tilting photography and real 3D modeling technology in the process of rock fall analysis and realizes the real scene restoration of the site. The point cloud data of the site is obtained, and the processing process of the point cloud is introduced in detail. The slope section of the site was obtained based on the point cloud, and RocFall software was used to obtain the motion characteristics of dangerous rock falling (falling trajectory, bouncing height impact energy, and impact velocity). The simulation results show that because of the rugged slope, the falling rocks collide and rebound on the slope for many times. In addition, near the bottom of the slope, there is a steep cliff with a height of 136.21 m, which is approximately 54° from the horizontal line, causing the falling rock to bounce and eventually fall at a higher height. It moves to the bottom of the slope and bounces off the level of the railway line before finally settling on the railway road. The maximum bounce height of falling rock in the process of slope rolling motion reaches 30 m. When falling rock moves near the railway line (coordinate is on the right side of zero), the bounce height is 15∼25 m, which threatens the safety of the railway operation. Conclusion. The UAV tilt photography technology can be well applied to the analysis of rockfall motion characteristics of dangerous rocks, and provide an accurate cross-section data information for the study of rockfall motion characteristics of dangerous rocks.

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Section: Introductionmentioning

confidence: 99%

UAV Tilt Photography Control for Numerical Simulation of High and Steep Rock Slopes

Wang

Zhou

Wang

2023

Journal of Control Science and Engineering

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Research on mechanism and practice of expansion‐induced fracturing and pressure relief in deep coal mines

Gu,

Liu,

et al. 2024

Energy Science & Engineering

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A nonexplosive expansion method is proposed to apply in the field of rock burst prevention and control in coal mine. The principle of the expansive agent reaction was analysed and specimens with one hole and two holes were tested with and without axial stress or an expansive agent. The results showed that the reaction products of the expansive agent exhibited excellent fluidity and did not induce secondary stress concentration within the specimens. The specimens with two holes exhibited more severe and intricate fractures upon introduction of the expansive agent, and the formation of crisscross networks of cracks occurred in both the horizontal and vertical directions. Stress concentration became more pronounced as the distance between the two holes decreased, making the specimen more vulnerable to cracking. A field test was conducted to evaluate the effectiveness of pressure relief through expansion‐induced fracturing in the roadway of 1318 working face. The results from the field test demonstrated that the quantity of coal powder in the deep area significantly decreased after expansion‐induced fracturing and fell well below the early warning index of the drilling cutting method.

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Mechanism of Roof Cutting and Stress Relief in Coal Seams with Hard Sandstone Coverage

Kong,

Liu,

Yang

et al. 2024

Geotech Geol Eng

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A Comparison of the Seismic Effects of Different Blasting Types Executed During the Longwall Mining of a Coal Seam

Cited by 4 publications

References 15 publications

UAV Tilt Photography Control for Numerical Simulation of High and Steep Rock Slopes

UAV Tilt Photography Control for Numerical Simulation of High and Steep Rock Slopes

Research on mechanism and practice of expansion‐induced fracturing and pressure relief in deep coal mines

Mechanism of Roof Cutting and Stress Relief in Coal Seams with Hard Sandstone Coverage

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