Selection of an Appropriate Mechanized Mining Technical Process for Thin Coal Seam Mining

Wang, Chen; Tu, Shihao

doi:10.1155/2015/893232

Cited by 11 publications

(6 citation statements)

References 17 publications

(18 reference statements)

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“…Selective coal mining makes it possible to solve a number of problems arising during stoping within coal seams which thickness is less than a meter (Glamheden & Hökmark, 2010;Fomychov, 2012;Kovalevs'ka, Symanovych, & Fomychov, 2013). However, the key initial problem of the method is significant amount of rock, being undercut, which was planned to hoist to the surface originally (Dayang, 2013;Wang & Tu, 2015;Hu, Li, Hu, Zhou, & Yue, 2018;Li et al, 2018). Nevertheless, the development of the mined-out area backfilling with the use of the undercut rock has helped solve the problem.…”

Section: Statement Of the Problemmentioning

confidence: 99%

Analysis of operation parameters of partial backfilling in the context of selective coal mining

Sotskov¹,

Dereviahina²,

Маланчук³

2019

Min. miner. depos.

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Purpose is to determine factors of effect of mechanical parameters and geometry of packs, constructed using the undercut rocks in the process of selective coal mining, on the state of geomechanical system within a mine workingstope junction during a computational experiment. Methods.The computational experiments involved finite-element method to simulate three-dimensional analytical area of the geomechanical system. Rock mass was represented by twelve rock layers and a coal seam. In the process of the computations, neighboring rock layers displace freely relative to each other. Stresses and deformations have been calculated within a full-size 300×160×50 m block involving undisturbed rock mass, a stope and two development workings. Mechanical characteristics of packs were simulated using additional analytical calculations.Findings. The calculations of a geomechanical system of a mine working-stope junction have helped determine typical areas of the disturbed rock mass identifying a propagation mechanism of the stope roof fall taking into consideration the effect of backfilling parameters. Analysis of stress-strain state (SSS) of the geomechanical system within the stope roof, using the selected cross-sections, made it possible to define conditions of interaction of the rock layers resulting in the roof lowering on the packs.Originality. The identified regularities of interaction between a stope roof and backfilling components determine optimum conditions to control a stope roof during selective coal mining. It has been substantiated scientifically that consideration of longitudinal horizontal stresses to identify optimum backfilling parameters makes it possible to define unambiguously both a type, and geometry of protection schemes for the mined-out area of a stope in terms of different strength parameters and geometrical parameters of the disturbed rock mass. Practical implications.The results have helped determine a mechanism of a stope advance velocity as well as a type and geometry of the packs being constructed. The abovementioned makes it possible to minimize expenditures for internal logistics; to cheapen prime cost of mining; and to improve safety of stope miners.

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Section: Statement Of the Problemmentioning

confidence: 99%

Analysis of operation parameters of partial backfilling in the context of selective coal mining

Sotskov¹,

Dereviahina²,

Маланчук³

2019

Min. miner. depos.

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“…The selection of technical parameters of machines and equipment is important due to the arduous conditions in which they will work. It is possible to evaluate correctly selected machines through active monitoring of their operating parameters and analysis of operating conditions [33][34][35][36][37][38][39]. One of the main sources of hazards causing accidents at work in mining plants is the technical infrastructure and, in particular, machinery and technical equipment.…”

Section: Introductionmentioning

confidence: 99%

A Step-by-Step Procedure for Tests and Assessment of the Automatic Operation of a Powered Roof Support

et al. 2021

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A powered longwall mining system comprises three basic machines: a shearer, a scraper (longwall) conveyor, and a powered roof support. The powered roof support as a component of a longwall complex has two functions. It protects the working from roof rocks that fall to the area where the machines and people work and transports the machines and devices in the longwall as the mining operation proceeds further into the seam by means of hydraulic actuators that are adequately connected to the powered support. The actuators are controlled by a hydraulic or electro-hydraulic system. The tests and analyses presented in the developed procedure are oriented towards the possibility of introducing automatic control, without the participation of an operator. This is important for the exploitation of seams that are deposited at great depths. The primary objective was to develop a comprehensive methodology for testing and evaluating the possibility of using the system under operating conditions. The conclusions based on the analysis presented are a valuable source of information for the designers in terms of increasing the efficiency of the operation of the system and improving occupational safety. The authors have proposed a procedure for testing and evaluation to introduce an automatic control system into the operating conditions. The procedure combines four areas. Tests and analyses were carried out in order to determine the extent to which the system could be potentially used in the future. The presented solution includes certification and executive documentation.

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“…Currently, theoretical research and engineering practice about the mining technology and equipment for thin seams have been carried out at home and abroad (Fang et al, 2008; Guo, 2013; Liu, 2011; LV, 2009; Wang, 2009, 2016; Xu et al, 2012; Yuan, 2011). As a result, mechanized and automatic mining is the ideal path and the inevitable way to improve production efficiency and reduce labor intensity for thin seam (MAO et al, 2011; Wang and Tu, 2015; Yuan, 2017). However, automatic mining can be achieved only in suitable conditions, such as coal thickness changed very little or without geological structures.…”

Section: Introductionmentioning

confidence: 99%

New advances in automatic shearer cutting technology for thin seams in Chinese underground coal mines

Chen

Zhou

2021

Energy Exploration & Exploitation

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Automatic mining technology is the ideal path and the inevitable way to improve production efficiency, reduce labour intensity and ensure safety for thin coal seam. Recently, while automatic mining technology is increasingly applied in China for thin seams, the corresponding automatic cutting technology has made new advances. Among them, mnemonic cutting technology has been fruitful industrial tested with suitable conditions. Simultaneously, another one called cutting trace pre-set technology of the shearer has been put forward. Using this method, the cutting trace in the area with coal thickness changed and geological structures can be preset. What's more, self-adaptive regulation strategy of cutting trace based on coal-rock recognition by monitoring current of cutting motor was discussed. Then, the main problems and development trends of automatic mining in China was also proposed.

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Selection of an Appropriate Mechanized Mining Technical Process for Thin Coal Seam Mining

Cited by 11 publications

References 17 publications

Analysis of operation parameters of partial backfilling in the context of selective coal mining

Analysis of operation parameters of partial backfilling in the context of selective coal mining

A Step-by-Step Procedure for Tests and Assessment of the Automatic Operation of a Powered Roof Support

New advances in automatic shearer cutting technology for thin seams in Chinese underground coal mines

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