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 3 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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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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Mechanism and Prevention of Rock Burst in a Wide Coal Pillar under the Superposition of Dynamic and Static Loads

Jiang,

Xu,

et al. 2024

Processes

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To address the frequent occurrence of rock burst disasters in areas with wide coal pillars during mining in the western mining area of China, the wide coal pillar area of the Tingnan coal mine in Shanxi Province was used as the research background. Theoretical analysis, numerical simulation, and field tests were used to establish the mechanical criterion and the energy criterion for the dynamic instability of wide coal pillars. The process and mechanism of wide coal pillar dynamic instability under dynamic and static load disturbances were revealed, and a wide coal pillar rock burst prevention and control scheme was proposed. The results indicated that when the load above a coal pillar reached the stress failure index and the energy failure index was met, the coal pillar reached the critical conditions for rock burst. With increasing static load, the stress, energy, and range of the plastic zone all showed increasing trends on both sides of the coal pillar. Under a given dynamic load, the stress and plastic zone range of the coal pillar significantly increased compared to those without a dynamic load. Under a given static load, the greater the dynamic load, the more likely the coal pillar was to undergo dynamic instability. The evolution of coal pillar dynamic instability was divided into three stages: energy accumulation, local instability, and dynamic instability. When the critical stress and energy conditions for coal pillar dynamic instability are exceeded, rock burst will occur. To reduce the static and dynamic loads of coal pillars, a rock burst prevention and control scheme of energy release and load reduction was proposed and applied onsite. The monitoring results showed that this control plan effectively reduced the stress of the coal pillar and the dynamic load generated by the fracture of the overlying rock layer, indicating safe mining in this area of wide coal pillars.

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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 3 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

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

Mechanism and Prevention of Rock Burst in a Wide Coal Pillar under the Superposition of Dynamic and Static Loads

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