Optimization and Practice of Support Working Resistance in Fully-Mechanized Top Coal Caving in Shallow Thick Seam

Huang, Peng; Feng, Jie; Jessu, Kashi Vishwanath; Xiao, Meng; Guo, Shuai

doi:10.3390/en10091406

Cited by 20 publications

(17 citation statements)

References 6 publications

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“…Based on that, in order to further upgrade the crushing effect of top-coal and reduce the block size of broken top-coal, the chock supports are raised up and down repeatedly by manual operation before moving the chock support forward, which can help the top-coal to be crushed into smaller blocks or pieces, as shown in Figure 6a above. In this case, the pressure from the main roof inflicted on the chock supports is alleviated and the strata behavior in the working face is moderate [16]. …”

Section: Optimization Of Caving Processmentioning

confidence: 94%

“…Hence it is necessary to weaken the top-coal, and some measures, After reviewing the literature, it was noticed that the chock support failure accidents reported are mainly in fully mechanized mining faces of shallow coal seams, in the Shendong coalfield [6,7], while chock support failure accidents in LTCC faces are rarely reported. Also, in recent years the research relating to LTCC has concentrated mainly on the mechanisms of top-coal caving and technical measures to improve the top-coal recovery rate [8][9][10][11][12][13][14][15][16][17][18][19]. Many scholars have conducted studies on the influence of the front abutment pressure [8], coal seam dip [9], coal strength [10,11], fracture distribution and stress conditions [12,13], thickness of top-coal [14], size of the top-coal blocks [15] and support working resistance [16] on the cavability of top-coal, and the corresponding measures to improve the cavability and recovery rate of top-coal [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China

Zhu

et al. 2018

Energies

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Longwall chock support failures seriously restrain the safety and high-efficiency of mining of extra thick coal seams, as well as causing a great waste of coal resources. During longwall top-coal caving (LTCC), the influential effect of the properties and the movement regulation of top-coal on strata behavior cannot be ignored, since the top-coal is the medium through which the load of the overlying strata is transferred to the chock supports. Taking Datong coalfield as an example, the mechanism of a chock support failure in the LTCC face was investigated. Research findings indicated that the hard top-coal and insufficient chock support capacity were primary reasons for chock support failure accidents. On account of the field-measured results, a new method to determine support capacity was proposed, which fully took the impact of the top-coal strength into consideration. The calculation revealed that the required support capacity had exceeded the existing production maximum, at about 22,000 KN. Since it was unrealistic to simply increase chock support capacity, other approaches, according to the theoretical analysis, were proposed, such as lowering the integrity and strength of the top-coal, and upgrading its crushing effect to weaken the support load effectively during the weighting period, which reduces the likelihood of chock support accidents occurring. Based on this, hydraulic fracturing for hard top-coal and optimization of the caving process (chock supports raised up and down repeatedly by manual operation before moving forward) were presented. The proposed solutions were successfully applied in LTCC-west8101 for subsequent mining and achieved substantial benefits. The above research provides valuable references and ideas for the control of strata behavior to ensure safe and highly efficient mining in extremely thick and hard coal seams with the LTCC method.

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Section: Optimization Of Caving Processmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China

Zhu

et al. 2018

Energies

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“…Coal miners are faced with more dangerous and more severe working environment than workers from other industries. Frequent coal mine accidents seriously affect the safety situation of China's coal industry and sustainable socioeconomic development as a whole [3,4]. In recent years, survey and analysis reports over several coal mine accidents in China have confirmed that off-post problems of coal miners play a key role.…”

Section: Introductionmentioning

confidence: 99%

Game Research on Coal Mine Workers’ Off‐Post Behaviors

Zeng

Yao

Wang

et al. 2019

Mathematical Problems in Engineering

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In order to seek for causes and solutions of off-post behaviors of coal miners, static and evolutionary games were utilized on the basis of an established strategy simulation model between coal mine enterprise and coal miners. These games were used to determine the revenue matrix of two game parties given off-post behaviors of coal miners from two levels (coal miners and coal mine enterprise). Thus, equilibrium and dynamic evolutionary analyses of the two parties should be conducted. Results indicated that, in the enterprise’s perspective, inspection cost and punishment intensity are important factors that influence the safety production and economic benefit of coal mine enterprises; in the coal miners’ perspective, wage loss and the constraint degree it generates are essential factors. Furthermore, these factors constitute a key to solving off-post behaviors of coal miners. Reasonability of the established simulation model was analyzed and verified on the basis of off-post behaviors of workers from a coal mine that belongs to Yanzhou Coal Mining Co., Ltd. The coal mine enterprise should enhance the inspection of safety production and establish scientific and complete off-post punishment mechanism. Moreover, the coal mine enterprise should provide proper compensation, treatment, and reward policies of workers to reduce the off-post behaviors of workers from a coal mine enterprise effectively.

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“…In last decades, many efforts have been devoted. Peng et al [3] put forward a method of optimizing and inverting working resistance based on the roof control effect and work in resistance overrun percentage. Singh and Singh [4] established a numerical modelling approach to predict the progressive caving behavior of strata and performance of powered roof support in a given geo-mining and strata condition.…”

Section: Introductionmentioning

confidence: 99%

The characteristics of mining induced stress fluctuations in broken rock mass over one kilometer deep coal mine

Yin

Xie

et al. 2019

THERM SCI

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Mine pressure is critical to the safety of working face. Evaluating the working resistance accurately of the stope hydraulic supports is one of the most effective and direct ways to reflect the overall stress characteristics of the roof and the deformation, movement and destruction of overlying strata. Due to the complex breaking form of the roof, the working resistance of the hydraulic supports at different positions of the mining face varies in different ways. One can obtain the pressure of hydraulic support system by pressure monitoring and analyze its fractal characteristics. Through spectrum analysis, a new parameter called accumulation power spectral density is defined which is used to describe the difference of working resistance of stope hydraulic supports. The results show that the fractal dimensions of face-end supports are smaller and face-end supports are unco-ordinated. Through in-situ monitoring, it is found that the mining stress has unstable periodic fluctuation characteristics. The conclusion can provide reference for rational selection and optimization of the similar-mining lay-outs.

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Optimization and Practice of Support Working Resistance in Fully-Mechanized Top Coal Caving in Shallow Thick Seam

Cited by 20 publications

References 6 publications

Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China

Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China

Game Research on Coal Mine Workers’ Off‐Post Behaviors

The characteristics of mining induced stress fluctuations in broken rock mass over one kilometer deep coal mine

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