Risk Analysis and Extension Assessment for the Stability of Surrounding Rock in Deep Coal Roadway

Gao, Chunjing; Huang, Dongmei; Chang, Xikun; Han, Xiao

doi:10.3390/ijerph16234752

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…At the same time, it is also the largest coal producer and consumer in the world [1][2][3]. As the most important basic energy source, coal still plays a very important role in economic and social development [4][5][6][7][8][9]. In the process of deep mining, under the influence of "three highs and one disturbance", the mechanical properties and engineering response characteristics of coal rock will change greatly, and rock burst accidents will frequently occur [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method for Rock Burst Hazards in Strip Filling of Working Faces in Deep Coal Mines

Chen,

Sun,

Zhang

et al. 2023

Applied Sciences

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The impact risk evaluation for the strip filling of working faces has always been a research hotspot and a difficulty in the field of rock bursts. In this paper, the concept of the critical filling rate is first proposed, and the criterion for identifying the impact risk of the strip filling of a working face is established. Then, the membership function of coal body stress and the coal seam elastic energy index to impact risk was established, and the classification index of the impact risk grade was formed. On this basis, the overall and local evaluation method of the rock burst hazard for the strip filling of working faces was proposed. Finally, the C8301 working face of the Yunhe coal mine was taken as the engineering background, and the impact risk evaluation was carried out. It was found that the overall risk of the C8301 working face was determined as a strong impact risk, and there were six local risk areas, which included two weak impact risk areas, two medium impact risk areas, and two strong impact risk areas. This study can provide guidance and a reference for the impact risk evaluation of strip-filling mining under the same or similar conditions.

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Section: Introductionmentioning

confidence: 99%

Evaluation Method for Rock Burst Hazards in Strip Filling of Working Faces in Deep Coal Mines

Chen,

Sun,

Zhang

et al. 2023

Applied Sciences

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“…In recent years, subway tunnels, hydraulic tunnels, urban underground space, coal underground mining, and other projects have increased, and the stability of geotechnical bodies in underground engineering needs to be solved urgently. Therefore, the evaluation of the stability of the surrounding rock in underground engineering has been a research hotspot in the discipline of rock mechanics and engineering and a key technical difficulty that needs to be solved urgently in practical engineering [ 1 , 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Synergetic Theory of Information Entropy Based on Failure Approach Index for Stability Analysis of Surrounding Rock System

Xiong,

Yuan,

Liu

et al. 2023

Entropy

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It is generally acknowledged that the stability evaluation of surrounding rock denotes nonlinear complex system engineering. In order to accurately and quantitatively assess the safety states of surrounding rock and provide a scientific basis for the prevention and control of surrounding rock stability, the analysis method of the synergetic theory of information entropy using the failure approach index has been proposed. By means of deriving the general relationship between the total two-dimensional plastic shear strain and the total three-dimensional plastic shear strain and obtaining the numerical limit analysis step of the plastic shear strain, the threshold value of the ultimate plastic shear strain can be determined, which has provided the key criterion for the calculation of the information entropy based on the failure approach index. In addition, combining with the synergetic theory of the principle of maximum information entropy, the evolution equation of the excavation step and information entropy based on the failure approach index of the surrounding rock system in underground mining space are established, and the equations of the general solution and particular solution as well as the expression of the destabilizing excavation step are given. To account for this, the method is applied to analyze the failure states of the floor surrounding rock after the mining of the 71 coal seam in Xutuan Coal Mine and involve the disturbance effect and stability control method of the underlying 72 coal seam roof from the macroscopic and microscopic aspects. Consequently, the validity of the analysis method of synergetic theory of information entropy based on the failure approach index has been verified, which presents an updated approach for the stability evaluation of surrounding rock systems that is of satisfactory capability and value in engineering applications.

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“…C.J. Gao established the matter-element model of rock mass accident risk assessment in a deep roadway by combining hazard source theory with the extension method [5]. Y. Luo analyzed the stability of the surrounding rock in a deep roadway [6].…”

Section: Introductionmentioning

confidence: 99%

Study on Evolution of Front Abutment Pressure at Working Face in Repeated Mining of Close-Distance Coal Seams

et al. 2022

Sustainability

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In order to determine the reasonable width of a stopping coal pillar in close-distance coal seams, the evolution law of front abutment pressure of the working face with repeated mining was studied. Based on the actual engineering project, we conducted field measurement, theoretical analyses, numerical simulations and a physical similarity simulation test to study. The results show that: (1) according to field measurement, the influence range of front abutment pressure increases from 60 m to 75 m with repeated mining; (2) according to theoretical analysis, the arch height and span are negatively and positively correlated with the influence range of front abutment pressure, respectively; (3) with repeated mining, the arch height increased to 165 m, the arch span to 235 m and the influence range to 83.5 m by 14.5 m relative to that before repeated mining; (4) if it is necessary to ensure that the main roadway is less affected by the mining stress, the width of the stopping coal pillar in 2214 working face should be greater than 80 m. The influence range of front abutment pressure increases obviously with repeated mining in close-distance coal seams. The study provides a reference for similar engineering projects.

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Risk Analysis and Extension Assessment for the Stability of Surrounding Rock in Deep Coal Roadway

Cited by 10 publications

References 28 publications

Evaluation Method for Rock Burst Hazards in Strip Filling of Working Faces in Deep Coal Mines

Evaluation Method for Rock Burst Hazards in Strip Filling of Working Faces in Deep Coal Mines

Synergetic Theory of Information Entropy Based on Failure Approach Index for Stability Analysis of Surrounding Rock System

Study on Evolution of Front Abutment Pressure at Working Face in Repeated Mining of Close-Distance Coal Seams

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