Relationship between mining thickness and peak position of advancing abutment pressure: a case study in Helin coal mine in China

Cheng, Zhiheng; Qin, Hongyan; Chen, Liang; Zhao, Xidong; Yin, Song

doi:10.1007/s12517-021-07492-7

Cited by 3 publications

(6 citation statements)

References 30 publications

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“…39,40 It is difficult to directly measure the advance abutment pressure from the middle of working face. 41 However, the latter can better represent the advance abutment pressure of the whole working face. In addition, in the long-term operation of main roadways, the influence of rock creep on the advance abutment pressure cannot be ignored.…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

“…(c) The reasonable staggered distance between lower retracement channel and upper end‐mining coal pillar edge. Advance abutment pressure of N0381 working faceTaking the working face under solid coal (zone A) as an example, the distribution law of advance abutment pressure is analyzed.The monitoring of the advance abutment pressure is often carried out in headgate or tailgate 39,40 . It is difficult to directly measure the advance abutment pressure from the middle of working face 41 . However, the latter can better represent the advance abutment pressure of the whole working face.…”

Section: Design Principle and Control Strategy For Lower Retracement ...mentioning

confidence: 99%

“…The monitoring of the advance abutment pressure is often carried out in headgate or tailgate 39,40 . It is difficult to directly measure the advance abutment pressure from the middle of working face 41 . However, the latter can better represent the advance abutment pressure of the whole working face.…”

Section: Design Principle and Control Strategy For Lower Retracement ...mentioning

confidence: 99%

See 2 more Smart Citations

Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

et al. 2022

Energy Science & Engineering

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Different from single coal seam mining, the stress evolution in the end mining stage of close-distance coal seams is extremely complex. The unreasonable position and support of the lower retracement channel will cause serious deformation and damage to the surrounding rock. Taking the Yanzishan coal mine as the engineering background, the deformation and failure characteristics of the retracement channel under different overlay environments and the key influencing factors of position design were discussed by numerical simulation, theoretical analysis, and field investigation. The results show that the coupling superposition of upper coal pillar high stress and mining dynamic pressure will form a dangerous area with severe ground pressure behavior. The retracement channel should be preferentially designed in zone A (overlying mining roadways), followed by zone B (overlying end-mining coal pillar), and finally, zone C (overlying section coal pillar). In addition, the rational horizontal distance between the lower retracement channel and the upper end-mining coal pillar should make the channel in a good stress environment. The safety distance between the retracement channel and the nearest main roadway (end-mining coal pillar width) should be greater than the severe range of advance abutment pressure. Finally, the design principle and control strategy for the lower retracement channel is proposed. The feasibility and rationality of the study are verified by industrial applications.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Section: Design Principle and Control Strategy For Lower Retracement ...mentioning

confidence: 99%

Section: Design Principle and Control Strategy For Lower Retracement ...mentioning

confidence: 99%

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Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

et al. 2022

Energy Science & Engineering

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“…The immediate roof of the longwall face is a hard, inferior key stratum. The longwall face is affected by the advancing abutment pressure [45][46][47] when it advances to form a larger span. The diagonal failure of the coal pillars of the No.…”

Section: Analysis Of the Disaster Mechanism Of The Strong Ground Pres...mentioning

confidence: 99%

Research on Strong Ground Pressure of Multiple-Seam Caused by Remnant Room Pillars Undermining in Shallow Seams

Liang

et al. 2021

Energies

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Numerous room-and-pillar mining goaf are apparent in western China due to increasing small coal mining activities, which causes the collapse of the overlying coal pillars and the occurrence of strong ground pressure on the longwall face and surface subsidence. In this study, Yuanbao Bay Coal Mine, Shuozhou, Shanxi, was selected to study the collapse of the overlying coal pillars on the longwall face and reveal the mechanism of the pillar collapse and the disaster-causing mechanism caused by strong ground pressure. Results show that the dynamic collapse process of coal pillars is relatively complicated. First, the coal pillars on both sides of the goaf are destroyed and destabilized, followed by the adjacent coal pillars, which eventually cause a large-scale collapse of the coal pillars. This results in a large-scale cut-off movement of the overlying strata, and the large impact load that acts on the longwall face causes an unmovable longwall face support. Moreover, the roof weighting is severe when strong ground pressure occurs on the longwall face, causing local support jammed accidents. Furthermore, the data of each measurement point of the strata movement inside the ground borehole significantly increases, and the position of the borescope peeping error holes in the ground drill hole rise steeply. The range of movement of the overlying strata increases instantaneously, and the entire strata begin to move. Research on the mechanism of strong ground pressure can effectively prevent mine safety accidents and avoid huge economic losses.

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“…After setting each parameter, modal analysis and calculation are performed, and the first 60‐order modes including many local modes are extracted by the block Lanzos method [17–19]. After obtaining the natural frequency and mode shape of the system, in order to determine the deformation of each part of the structure under different frequencies of simple harmonic loads, a harmonic response analysis is required.…”

Section: Introductionmentioning

confidence: 99%

Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

Wang

Dai

Zhang

et al. 2022

The Journal of Engineering

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Vibration, especially basic vibration, may cause loose contacts, open circuits, or other contact problems, which account for a large proportion of system failure causes. Due to the complexity of the chassis structure used in the biomedical motors, the vibration analysis of a single component cannot solve the vibration problems encountered in the work of the system. Therefore, it is necessary to use system simulation and experiments to monitor and enhance the health of the structure. Finite element method is used to carry out the dynamic analysis from the component to the system, and calculate the natural frequency, modal shape and harmonic response. Then, the effectiveness and accuracy of the analysis results are verified by experiments through simulation and experiments. The results show that the measures taken have effectively reduced the vibration of the chassis equipment and improved its safety for better health safety of patients. There is just a 2% variation between the natural frequencies acquired from the experiment and the simulation computation. In terms of natural frequency, the first 6‐order natural frequencies all have errors of less than 10%, and the natural frequency error is comparable to that of fireproof board.

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Relationship between mining thickness and peak position of advancing abutment pressure: a case study in Helin coal mine in China

Cited by 3 publications

References 30 publications

Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

Field and simulation study of the rational retracement channel position and control strategy in close‐distance coal seams

Research on Strong Ground Pressure of Multiple-Seam Caused by Remnant Room Pillars Undermining in Shallow Seams

Vibration signal diagnosis and conditional health monitoring of motor used in biomedical applications using Internet of Things environment

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