Investigating different methods used for approximating pillar loads in longwall coal mines

Tuncay, Deniz; Tulu, Ihsan Berk; Klemetti, Ted

doi:10.1016/j.ijmst.2020.12.007

Cited by 17 publications

(6 citation statements)

References 2 publications

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“…Nowadays, when solving problems of geomechanics, i.e. when assessing stability of the near-contour massif of mine workings, numerical methods are widely used [23]- [28]. They include a finite element method, a boundary element method, a finite difference method etc.…”

Section: Figure 2 Characteristic Shape Of Chamber Roof Caving At the ...mentioning

confidence: 99%

Analysis of the roof span stability in terms of room-and-pillar system of ore deposit mining

Zhienbayev¹,

Balpanova²,

Asanova³

et al. 2023

Min. miner. depos.

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Purpose. To ensure the roof span stability in terms of room-and-pillar system of mining taking into consideration the calculations, modelling, and statistic analysis of factual rock falls from the roof. Methods. Analysis of inelastic deformations to define overall displacement of a thin-layer roof of the chamber being 9 m wide was performed with the help of software complex RS2. To estimate the effect of chamber spans on the roof stability, a problem was considered in two variants where chamber width was 8 and then 7 m. The results were analyzed in terms of strength factor of the interchamber pillars. Statistic analysis of the roof stability loss for the chambers was carried out according to the results of monitoring of a state of the worked-out space in the context of the Zhaman-Aibat deposit. The obtained data were compared in terms of chamber roof spans being 9-7 m. Findings. The performed studies make it possible to state that the reduction of chamber spans down to 7 m decreases the roof deflection up to 2 cm and ensures stability of both chamber roof and worked-out space by 13 times; in its turn, that results in safe conditions while stoping. Optimal parameters of the roof span stability for chambers and safe mining conditions were substantiated basing on computer modelling and statistic analysis of the results of geotechnical monitoring of a state of worked-out space at the Zhaman-Aibat deposit. Originality. The regularity of changes in the safety factor of the peripheral part of a chamber was substantiated depending on the chamber width (7, 8, and 9 m) and considering the distance from the contoured chamber (m). Reduction of the chamber span by 1 m (from 9 to 8 m) reduces roof deflection by 2 times (up to 5 cm); moreover, breaking depth in the roof experiences considerable reduction – up to 1.75 m. Reduction of the chamber span by 1 m more (from 8 to 7 m) reduces the roof deflection up to 2 cm; breaking depth in the roof decreases considerably as well – up to 1.33 m. Practical implications. The proposed variant of chamber span reduction can decrease significantly the total area of rock falls and ensure stability of the worked-out space of the Zhomart mine where roof stability is the weakest element on the mining system. The obtained results can be the basis for the development of methodological recommendations to calculate mining parameters at the Zhaman-Aibat deposit as well as at other deposits with medium roof stability.

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Section: Figure 2 Characteristic Shape Of Chamber Roof Caving At the ...mentioning

confidence: 99%

Analysis of the roof span stability in terms of room-and-pillar system of ore deposit mining

Zhienbayev¹,

Balpanova²,

Asanova³

et al. 2023

Min. miner. depos.

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“…As a three-dimensional numerical simulation software based on the finite difference principle, FLAC3D has the characteristics of high calculation efficiency and wide range of application. In recent years, FLAC3D has been applied in geotechnical engineering by many scholars [12][13][14][15]. Therefore, FLAC3D was chosen to study rock movements in deep-well mining of Chentaigou Iron Mine.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Simulation Study of ground surface subsidence caused by filling mining on surface buildings and facilities in a mining area: a case study

Liu¹,

Liu²,

Chen³

et al. 2022

AETR

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The filling mining method is planned to be adopted in Chentaigou Iron Mine. There are many significant buildings and facilities in the mining area, making it necessary to evaluate the influences of underground mining on the surface buildings and facilities. The main purpose of this research was to evaluate the extent of the surface subsidence basin and the degree of damage of buildings and facilities after filling mining by numerical simulation. To this end, a three-dimensional numerical model of the whole mining area was established. Secondly, a Discrete Fracture Network (DFN) in 3DEC numerical simulation software was adopted to obtain the strength parameters of each representative elemental volume (REV). Furthermore, FLAC3D numerical simulation software was utilized to evaluate the range of influence of the surface subsidence basin after filling mining. Finally, the maximum major principal strain on the surface was calculated. The results show that the surface subsidence basin of underground mining in this iron mine undergoes slow expansion then rapid expansion. Expansion of the surface subsidence basin is restricted by fault F1. After the mining orebody, the maximum major principal strain of surface meets design requirements, and the surface buildings and facilities are deemed safe.

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“…With the gradual maturity and improvement of engineering geological numerical simulation technology, more and more researchers are comparing and verifying numerical simulation results with on-site measurement results to better solve engineering geological problems. Tuncay et al [28], Unver et al [29], and Shang et al [30] constructed a numerical model to analyze the roof settlement, surrounding rock damage, and stress evolution laws caused by the coal mining process and compared it with the measured results, which showed good results. In the above numerical simulation studies, multiple rock layers are usually constructed in the model; however, there is relatively little research on treating the top and bottom plates as one layer each.…”

Section: Introductionmentioning

confidence: 99%

Research on Multi-Physical Field Characteristics of Deep Coal Seam Mining Based on the Rock-Coal-Rock Model

Du,

Zhang,

Dai

et al. 2024

Processes

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In order to disclose the multi-physical field characteristics of the deep coal seam mining process and their dynamic evolution legislation, based on the “rock-coal-rock” model, during the mining process, the stress field, displacement field, energy field, and plastic zone evolution process are all simulated using FLAC3D6.0. The findings show that stress in the original rock is redistributed as a result of coal seam mining, creating a pressure relief zone in the middle of the goaf and advanced support pressure in the front part of the working face. The roof falls following the termination of coal seam mining. The collapsed blocks fill the middle of the goaf, playing a supporting role. The floor bulges as a new supporting pressure zone forms and builds up high elasticity. The stress reduction zone shifts from a rectangular to an inner circular distribution and an outer square as the working face’s mining distance increases and the range of the fracture field expands accordingly. In addition, a complete model was constructed to verify the correctness of the “rock-coal-rock” model. The stress, displacement, and energy curves of the overlying strata at a distance of 12 m from the bottom of the coal seam in the middle of the goaf obtained by the two methods were basically consistent. Ultimately, the findings of the numerical simulation were compared with the advanced support pressure data that were acquired on-site and they were good. This work can provide a reference for the safe mining of deep coal seams.

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Investigating different methods used for approximating pillar loads in longwall coal mines

Cited by 17 publications

References 2 publications

Analysis of the roof span stability in terms of room-and-pillar system of ore deposit mining

Analysis of the roof span stability in terms of room-and-pillar system of ore deposit mining

Numerical Simulation Study of ground surface subsidence caused by filling mining on surface buildings and facilities in a mining area: a case study

Research on Multi-Physical Field Characteristics of Deep Coal Seam Mining Based on the Rock-Coal-Rock Model

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