Numerical modelling of multistage caving processes: insights from multi‐seam longwall mining‐induced subsidence

Ghabraie, Behrooz; Ghabraie, Kazem; Ren, Gang; Smith, John Grieve

doi:10.1002/nag.2659

Cited by 32 publications

(21 citation statements)

References 30 publications

(58 reference statements)

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“…More complicated mining conditions and dynamic processes, such as jointed overburden strata [70], multi-seam mining [71], and domino-like collapse disaster of room-and-pillar mines [72], can also be investigated. Numerical simulation methods have been an important tool in mine design and mine behavior analysis [73][74][75][76][77][78].…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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Abstract:Partial extraction methods such as underground strip pillar mining or room-and-pillar mining are widely adopted techniques to control ground subsidence. However, pillar failure in partial extraction mines may introduce violent secondary ground collapses. The stability of partial extraction mines dictates the safety of ground surface structures and the environmental health state of the surrounding mining areas. To reuse mining subsidence lands, it is necessary to evaluate the stability of the land through mine subsidence assessments. This paper summarizes current pillar stability assessment methods and their limitations, and the rock mechanics associated with the stability of abandoned mines. The effects of multiple factors that affect mine stability are discussed in detail; special attention has been extended to discuss the weathering effects associated with infused water and spontaneous combustion, as these are some key reasons for pillar strength degradation in abandoned mines. The mechanism of mine collapse and the corresponding post-mining disasters are also summarized. Finally, suggestions and strategies to improve current mine stability assessment methods are proposed based on the perspective of subsidence control.

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Section: Numerical Simulation Methodsmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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“…(2) Select the experimental factors. The Mohr-Coulomb yielding criterion, which is adopted in this study, can reasonably predict large strata deformation induced by coal-seam mining [21]. Four parameters are considered in this criterion, E, µ, c and ϕ, which are chosen as the experimental factors.…”

Section: Parameter Inversion Of the Strata Overlying The Upper Seammentioning

confidence: 99%

“…Therefore, it is necessary to carry out the parameter degradation of the yielded rock when calculating the subsidence induced by mining the lower seam. In this study, when carrying out the numerical simulation in FLAC 3D 5.0 (V5.0, Itasca, Minnesota, USA), the E of yielded rock is reduced by 99.5%, while other parameters are unchanged, according to Ghabraie et al [21]; the corresponding code is provided in Supplementary Materials. (3) Calculate the subsidence induced by mining the lower seam (S 2 ).…”

Section: Subsidence Prediction In Two-seam Miningmentioning

confidence: 99%

“…However, conventional single-seam subsidence-prediction methods are inaccurate in predicting multiseam subsidence [18,19]. This is due to the differences in profile, shape and magnitude of multiseam subsidence in comparison with that of single-seam subsidence [20,21]. The empirical method puts great effort into subsidence prediction because of the lack of theoretical analysis and individual difference; the numerical modeling methods and theoretical analysis have great advantages in explaining the deformation mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Adhikary et al [19] evaluated the utility of 2D and 3D numerical simulation in multiseam subsidence prediction. Ghabraie et al [21] predicted the subsidence of two-seam mining by the 3D finite element analysis method. Ghabraie et al [26] studied the differences between the single-seam and multiseam subsidence parameters and proposed an improved influence function to predict the subsidence of multiseam mining.…”

Section: Introductionmentioning

confidence: 99%

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A Comprehensive Method for Subsidence Prediction on Two-Seam Longwall Mining

Zhang

et al. 2019

Energies

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The purpose of mining subsidence prediction is to establish a reliable assessment for surface subsidence resulting from underground mining. In this study, a new method for predicting subsidence in two-seam mining is proposed. First, the surface subsidence due to mining the upper seam is monitored. Then, taking the subsidence data as indicators, the optimal mechanical parameters of overlying strata can be obtained by orthogonal experimental design and inverse analysis of numerical simulation. Finally, further subsidence is calculated and predicted by the numerical model. A case of two-seam underground mining is studied using this methodology. This coal mine is located in the Dongsheng coal field in Inner Mongolia, China. Based on GPS surface subsidence monitoring and parameter inversion, the subsidence induced by two-seam mining is estimated and predicted. This study shows that the ratio of the height of overlying strata to mining thickness (H/M), mining configuration and adjacent mining have a significant effect on the surface subsidence caused by two-seam mining. By parameter inversion, the proposed optimal parameters can be applied to predict the subsidence of a nearby mine with similar stratigraphic conditions. Furthermore, this methodology can also be used to predict the subsidence caused by mining of more than two seams.

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Optimization of staggered distance of coal pillars in multiseam mining: Theoretical analysis and numerical simulation

Sun

Cheng³

2020

Energy Science & Engineering

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Aimed at solving problems related to water retention and loss reduction in multiseam mining, a mechanical model of staggered distance mining was established. First, elastic and plastic slip line field theories were used to calculate the reasonable staggered distance expressions of multiseam mining. The staggered distance schemes of multiseam mining were optimized using the numerical simulation software FLAC3D. By performing an experiment comparing similar materials, the influence on water retention and loss reduction by optimal and unfavorable staggered distance schemes in multiseam mining was explored. The results showed that the σzz curve was distributed in the shape of a “peak” of the staggering distance coal pillars, the Z displacement curve was a “Л,” and the surface subsidence curve was a “W.” Each of these displayed the rule of “decrease then increase.” In staggered distance multiseam mining, the optimal staggered distance value for coal seam Nos. 2 and 3 was 40 m, while the most unfavorable staggered distance value was 0 m. The corresponding subsidence coefficients of the optimal staggered distance values were 0.29, 0.23, and 0.19, under the condition of keeping the optimal staggered distance value for coal seam Nos. 1 and 2 unchanged. These results could be beneficial in reduction of surface subsidence and may also have specific practical engineering significance.

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Numerical modelling of multistage caving processes: insights from multi‐seam longwall mining‐induced subsidence

Cited by 32 publications

References 30 publications

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

A Comprehensive Method for Subsidence Prediction on Two-Seam Longwall Mining

Optimization of staggered distance of coal pillars in multiseam mining: Theoretical analysis and numerical simulation

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