Planning and design of underground space construction during longwall mining in coal mines

Wu, Weili; Bai, Jianbiao; Yan, Shuai; Wang, Xiangyu; Wu, Bowen

doi:10.1080/15567036.2020.1747574

Cited by 6 publications

(6 citation statements)

References 45 publications

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“…The following can be observed from Table 3. (1) In the inversion results of the goaf parameters (D 1 , D 2 , X c , Y c , H, ϕ n , α, m), the maximum relative error is 16.61%, and the absolute error is 26.57 m, which appears on the dip length D 2 . (2) Despite being the same type of parameters, the absolute error and relative error of the strike and dip length D 1 and D 2 are quite different.…”

Section: Inversion Of Goaf Parametersmentioning

confidence: 96%

“…Therefore, two groups of experiments were designed. (1) The cyan area was used to obtain accurate PIM parameters [8]; the aim of this group of experiments was to provide the PIM parameters of this area for the second experiment to verify the experimental results. (2) The red was used to obtain the positioning parameters and PIM parameters of the underground goaf to verify the feasibility of the proposed method.…”

Section: Sar Data Processingmentioning

confidence: 99%

“…This often results in the reduction of ground elevation, which can cause serious ecological and environmental problems including farmland inundation, soil salinization, and desertification. It can also be detrimental to the safety of people's lives and property [1,2]. Research examining mining subsidence has played a positive role in reducing surface subsidence disasters and economic losses [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Position Inversion of Goafs in Deep Coal Seams Based on DS-InSAR Data and the Probability Integral Methods

Zhang

Fan

et al. 2021

Remote Sensing

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The goafs caused by coal mining cause great harm to the surface farmland, buildings, and personal safety. The existing monitoring methods cost a lot of workforce and material resources. Therefore, this paper proposes an inversion approach for establishing the locations of underground goafs and the parameters of the probability integral method (PIM), thus integrating distributed scatter interferometric synthetic aperture radar (DS-InSAR) data and the PIM. Firstly, a large amount of surface deformation observation data above the goaf are obtained by DS-InSAR, and the line-of-sight deformation is regarded as the true value. Secondly, according to the obtained surface deformations, the ranges of eight goaf location parameters and three PIM parameters are set. Thirdly, a correlation function between the surface deformation and the underground goaf location is constructed. Finally, a particle swarm optimization algorithm is used to search for the optimal parameters in the range of the set parameters to meet the requirement for minimum error between the surface deformation calculated by PIM and the line-of-sight deformation obtained by DS-InSAR. These optimal parameters are thus regarded as the real values of the position of the underground goaf and the PIM parameters. The simulation results show that the maximum relative error between the position of the goaf and the PIM parameters is 2.11%. Taking the 93,604 working face of the Zhangshuanglou coal mine in the Peibei mining area as the research object and 12 Sentinel-1A images as the data source, the goaf location and PIM parameters of the working face were successfully inverted. The inversion results show that the maximum relative error in the goaf location parameters was 16.61%, and the maximum relative error in the PIM parameters was 26.67%.

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Section: Inversion Of Goaf Parametersmentioning

confidence: 96%

Section: Sar Data Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Position Inversion of Goafs in Deep Coal Seams Based on DS-InSAR Data and the Probability Integral Methods

Zhang

Fan

et al. 2021

Remote Sensing

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“…This circumstance made it possible to get rid of the chain pillars and apply Y-shaped ventilation system. In order to do this, the head goaf-side entry 2 was retained behind the longwall face using a roadside backfill body [16], [17], or an artificial wall [14] (Fig. 3).…”

Section: Chain Pillar Technology and Its Alternativementioning

confidence: 99%

Rock pressure relief is the basic alternative for sustainable underground mining

Nazimko¹,

Zakharova²,

Kusen³

et al. 2021

E3S Web Conf.

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Retreat longwall mining is the most productive system for underground extraction of tabulated deposits. However, the steady growth of the mining depth dramatically increased the ground pressure in chain pillars protecting the longwall entries. Therefore, several coal industries have tried to shift to pillarless mining and practiced maintenance of the head or tail entry behind the longwall in the stress relief zones using the backfill bodies in the thin coal seams. We modernized the pillarless variant of the retreat longwall system introducing the third roadway, which is driven in the consolidated goaf behind the moving longwall in a stress relief zone. We used a computer code FLAC3D to simulate stress redistribution during pillarless extraction of adjacent panels that assisted to determine optimal parameters of mining layout. This modernized technology provides for sustainable mining due to enhancement of transport, ventilation, safety conditions, and a comfortable environment because of the stability of the underground roadways, which serve the high productive longwalls.

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“…The efficiency of mining-out the coal seams and the safety of mining operations largely depends on the method used to control the roof in the stope face. As evidenced by the world experience of coal seams mining in difficult mining-and-geological conditions, the state of side rocks and the mine workings preservation in a sedimentary rock mass are most favourably influenced by the method of controlling the roof through backfilling of the mined-out space [1]- [3]. Therefore, in order to avoid emergency situations and reduce the probability of negative rock pressure manifestations in mine workings, especially when mining the coal seams at great depths, it is necessary to focus on backfilling of the mined-out space as a way to control the roof in the stope face.…”

Section: Introductionmentioning

confidence: 99%

Experimental characteristics for deformation properties of backfill mass

Iordanov¹,

Novikova²,

Simonova³

et al. 2020

Min. miner. depos.

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Determining the deformation properties of backfill mass used to preserve the continuity of the coal-rock stratum enclosing mine workings. Methods. To achieve the purpose set, laboratory studies have been performed on crushed rock samples with different granulometric composition, which are exposed to uniaxial compression in a steel cylinder. The experimental data are processed using the mathematical statistics methods. Findings. As a result of performed laboratory studies, it has been determined that during compression pressure of the backfill material from crushed rock, the deformation modulus is a variable value and depends on the value of the applied load, which means that it cannot be used as a physical characteristic of the backfill mass. It has been proven that the deformation modulus characterizes the backfill mass rigidity, that is, its ultimate stress state. The rigidity value under a constant external load, can be regulated using the granulometric composition of the crushed rock. It has been revealed that the maximum shrinkage of the backfill mass is achieved when repacking crushed rock fractions of different sizes under volume compression of the backfill material. In the case when the backfill material is a homogeneous fraction of crushed rock, when increasing the constrained modulus, the backfill mass rigidity increases, and shrinkage decreases. Originality. It has been proven that the values of the crushed rock compaction coefficient, which characterizes the shrinkage of the backfill mass, are correlated with a parabola and depend on the granulometric composition of the source material. With inhomogeneous granulometric composition, the compaction coefficient values are maximum, and for backfill material with the similar fraction, they decrease with a change in the bulk density of the crushed rock. Practical implications. To ensure the side rocks stability and to maintain mine workings in an operational state, it is necessary to ensure a uniform by volume granulometric composition inhomogeneity of the crushed rock. This determines the ability of the roof and bottom of the coal seam to effectively respond to the impact of external factors that are manifested in the mass of sedimentary rocks during mining operations.

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Planning and design of underground space construction during longwall mining in coal mines

Cited by 6 publications

References 45 publications

Position Inversion of Goafs in Deep Coal Seams Based on DS-InSAR Data and the Probability Integral Methods

Position Inversion of Goafs in Deep Coal Seams Based on DS-InSAR Data and the Probability Integral Methods

Rock pressure relief is the basic alternative for sustainable underground mining

Experimental characteristics for deformation properties of backfill mass

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