Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Jun-chao, Shen; Zhang, Ying

doi:10.1155/2021/6157174

Cited by 5 publications

(3 citation statements)

References 24 publications

(24 reference statements)

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“…The influence of subjective consciousness and the noise and the dark environment of the mine often lead to misjudgment, resulting in over-discharge or under-discharge. If over-discharging, a large amount of gangue will be transported out of the working face with coal flow, and if under-discharging, a large amount of coal will be left in the mined-out area, which is easy to cause spontaneous combustion , and gas explosion. − In the context of China’s current energy mining, top coal over-discharge occurs from time to time, and a large amount of gangue mining ground has a serious impact on China’s environment, economy, other resources and society, − as shown in Figure . Impact on the environment …”

Section: Model Building Backgroundmentioning

confidence: 99%

Research on Coal Gangue Recognition Based on Multi-source Time–Frequency Domain Feature Fusion

Zhang,

Yang,

Zeng

2023

ACS Omega

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The over-exploitation of resources caused by the increasing coal demand has resulted in a sharp increase in solid waste emissions mainly gangue, which has made the burden on the environment, economy, resources, and society of our country heavier. In order to achieve a balance between energy consumption and solid waste emission in the process of top coal caving, this study carried out coal gangue recognition research based on multi-source time–frequency domain feature fusion (MS-TFDF-F). First, the process of coal gangue symbiosis and the harm of gangue in top coal caving are analyzed, and the fundamental method of comprehensive treatment of gangue is put forward, which is the accurate recognition of the coal gangue interface. Second, by building a top coal caving simulation test bed, the MS signals generated in the caving process of the coal gangue mixture with a gangue content of 0–100% are collected and the TFDFs are extracted. Third, the MS-TFDF-F-based coal gangue recognition model is established. Then, the recognition effect of the two TFDF-F sample sets was compared, and the results show that the time–frequency domain feature selection fusion method (TFDFS-FM) has higher accuracy. On this basis, this paper studies the variation law of the number of sensors on the coal gangue recognition accuracy of MS information fusion. Finally, the economic, social, environmental, and resource benefits of the model are qualitatively described. The final results show that the MS-TFDF-F-based coal gangue recognition model has the strongest recognition ability when fusing six sensor signals, and the recognition accuracy reaches 99% under the AdaBoost algorithm. The establishment of this model brings huge benefits to China’s environment, economy, resources, and society, and it is helpful to realize the balance between loss reduction mining and solid waste emission reduction in the process of top coal caving.

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Section: Model Building Backgroundmentioning

confidence: 99%

Research on Coal Gangue Recognition Based on Multi-source Time–Frequency Domain Feature Fusion

Zhang,

Yang,

Zeng

2023

ACS Omega

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“…In the process of automatic formation caused by roof cutting and pressure release, adjusting the roof structure will lead to a large amount of deformation, and the surrounding rock of the roadway will yield or even result in plastic flow, as the coal body is far from the free surface when it is still in its elastic state [26,27]. Therefore, FLAC3D (Fast Lagrangian Analysis of Continua) can better simulate the distribution of stress and strain in the surrounding rock of the roadway, which can help analyze the distribution and change law of stress and displacement in the surrounding rock of the roof-cutting and pressure-releasing automatic roadway [28][29][30].…”

Section: Analysis Of Roadway Stability Of Top-cutting and Pressure-re...mentioning

confidence: 99%

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

et al. 2022

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Coal will continue to play an important role in China’s economic development and social development in the coming decades. However, due to the complex distribution conditions of coal resources, the mining of coal resources is subject to various restrictions. Coal and gas outburst is an important issue in coal mining, and the threat to the mining of coal resources caused by high gas outburst activity has been receiving more attention. In order to solve the problems related to safe and efficient mining under coal seams with gas outburst, such as mining difficulties, large amounts of work, resource waste, no guaranteed gas treatment time, and low economic efficiency, it is necessary to innovate mining technology and methods for managing gas outburst in coal seams to improve the efficiency of coal mines and to solve the above problems. This study proposes a green mining technical method system known as the “L-H method”, which is applicable to the safe and efficient mining of coal seams with gas outburst based on combined theoretical analysis and numerical simulation. The following research results are achieved: (1) The “L-H method” is proposed, and a mining area model of coal seams with gas outburst is established. The specific details of the method and the implementation process are introduced. (2) Examples of H coal mine applications are presented, and the effects of the implementation of the “L-H method” are analyzed and summarized through mine pressure observations from roadways, and it is concluded that the implementation of top-cutting and pressure-relief technology has a good control effect on the roadway-surrounding rock and that gas extraction reaches the national standard of less than 8 m3/t for protrusion prevention; this ensures safety and also achieves efficient mining. This study will provide a good reference for the implementation of green mining methods to similar coal and gas outburst mines.

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“…Guo et al [32][33][34] studied the construction scheme of gob-side entry retaining technology under thick and hard roof conditions, proposed the pre-splitting blasting method, and conducted experiments on the site. Qi et al [35][36][37] proposed a new scheme of gob-side entry retaining technology in three-soft coal seams based on the mechanical and numerical calculation model, including roadway expansion and large section roadway support, which provided theoretical guidance for construction under similar geological conditions. Based on site investigation and numerical analysis, Das et al [38][39][40] analyzed the failure mechanism of the soft roof of a roadway in gently inclined coal seams and determined the bolt support parameters after working face advancement.…”

Section: Introductionmentioning

confidence: 99%

Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine

Zhou

et al. 2022

Sustainability

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As a kind of non-coal pillar roadway support technique, gob-side entry retaining is of great significance to improve the production efficiency of a fully mechanized working face. However, the construction of the roadway is often subject to the surrounding rock conditions, the application is mainly concentrated in the nearly horizontal and gently inclined coal seam conditions, and the application in the steeply inclined coal seam conditions is relatively less. This paper is based on the gob-side entry retaining roadway construction of the 58# upper right 3# working face in the fifth district of Xinqiang Coal Mine, and describes the investigation in which we measured the advanced abutment stress, mining stress, and roof stress and analyzed the moving rule of roof. On this basis, in this work, we determined the filling parameters and process and investigated the filling effect from the perspective of the deformation of the filling body and the surrounding rock. The results show that the influence range of the advanced abutment stress in the working face is about 20~25 m, the stress in the upper part is intense, and stress in the middle and lower parts are relaxed. The setting load, the cycle-end resistance, and the time-weighted mean resistance at the upper end of working face along the direction of length are the largest, followed by the middle part, and the lower end is the minimum. When exploiting the steep inclined coal seam, the upper part of the working face is more active than the lower part, and the damaging range of overlaying strata is mainly in the upper part of the goaf. With this research, we established the filling mining process in steeply inclined coal seams and determined the relevant parameters. The gangue cement mortar filling can ensure the deformation of the filling body, the surrounding rock of the roadway is small in the process of roadway retention, and the stress of the filling body is also small, which ensure the successful retention of the roadway. This study verifies the possibility of repair-less exploitation and provides a reference for the popularization and application of the gob-side entry retaining technique in steep inclined coal seam.

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Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Cited by 5 publications

References 24 publications

Research on Coal Gangue Recognition Based on Multi-source Time–Frequency Domain Feature Fusion

Research on Coal Gangue Recognition Based on Multi-source Time–Frequency Domain Feature Fusion

Study on a High-Efficiency Mining Technology System for Gas Outburst in Coal Seams—Example of an H Coal Mine

Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine

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