Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining

Ünver, Bahtiyar; Yaşitli, Nazmi Erhan

doi:10.1016/j.coal.2005.05.008

Cited by 168 publications

(78 citation statements)

References 2 publications

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“…In the past, the studies are mainly done with the laboratory test and the theoretical analysis, but the laboratory tests need some cost, and the theoretical analysis has its limitation due to some assumption are needed in applying. So we want to find some more methods to study the topic, fortunately, in recent years, rapid advances in computer technology and sustained development have pushed the numerical analysis methods like the fast lagrangian analysis of continua three dimensions (FLAC3D) to the forefront of geotechnical practice [15][16][17][18]. In the present paper, the direct tests of joint are done to study the strength and deformation of joint, which will give some guidance for the real practice and the analytical studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation for direct shear test of joint in rock mass

Lin¹,

Cao²,

Yong³

2010

IJIGSP

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Abstract-Joint is among the most important factors in understanding and estimating the mechanical behavior of a rock mass. The difference of the strength, deformation characteristic of joint will lead to different strength and deformation of rock mass. The direct shear test is very popular to test the strength of joint owing to its simplicity. In order to study the three dimensional characteristic of joint, the numerical simulation software FLAC3D is used to build the calculation model of direct shear test under both loads in normal and shear direction. Deformation and mechanical response of the joint are analyzed, showing that, (1) relationship between shear strength and normal stress meets the linear Mohr-Coulomb criterion, the results are similar with that from the laboratory test; (2) the distribution of stress on the joint increases from the shear loading side to the other; and with the increase of normal stress, the distribution of maximum shear stress does not change much. The analysis results can give some guidance for the real practice; (3) the result from the numerical modeling method is close to that from the laboratory test, which confirms the correctness of the numerical method.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation for direct shear test of joint in rock mass

Lin¹,

Cao²,

Yong³

2010

IJIGSP

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“…Specifically, top coal caving in ESTCS is a completely different method compared with longwall top coal caving (LTCC) in gently inclined coal seams due to limited lengths of the working faces (Vakili and Hebblewhite 2010;Zhang et al 2011;Unver and Yasitli 2006). Generally, the length of the working face is shorter than the maximum length of 50.0 m, and the multi-narrow mine voids are above the mechanized SSTCC workings.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

et al. 2015

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When mechanized sub-horizontal section top coal caving (SSTCC) is used as an underground mining method for exploiting extremely steep and thick coal seams (ESTCS), a large-scale surrounding rock caving may be violently created and have the potential to induce asymmetric destabilization from mine voids. In this study, a methodology for assessing the destabilization was developed to simulate the Weihuliang coal mine in the Urumchi coal field, China. Coal-rock mass and geological structure characterization were integrated with rock mechanics testing for assessment of the methodology and factors influencing asymmetric destabilization. The porous rock-like composite material ensured accuracy for building a 3D geological physical model of mechanized SSTCC by combining multi-mean timely track monitoring including acoustic emission, crack optical acquirement, roof separation observation, and close-field photogrammetry. An asymmetric 3D modeling analysis for destabilization characteristics was completed. Data from the simulated hydraulic support and buried pressure sensor provided effective information that was linked with stress-strain relationship of the working face in ESTCS. The results of the 3D physical model experiments combined with hybrid statistical methods were effective for predicting dynamic hazards in ESTCS.

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“…Advancements in mining technology and equipment have made fully-mechanized top coal caving (FMTCC) an important mining technique that can ensure safe and efficient production in mines with suitable conditions [1][2][3][4][5]. Using various methods, scholars have conducted systematic and in-depth research on the overburden movement and strata behavior induced by FMTCC in different conditions.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Strata Behavior during Thick Seam Mining by Fully-Mechanized Top Coal Caving in a Loess-Covered Gullied Region

Wang

Zhang

et al. 2017

Minerals

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This study systematically investigates the overburden movement and strata behavior at a fully-mechanized top coal caving (FMTCC) face in a thick coal seam in a loess-covered gullied region by field measurement and theoretical analysis. A comparative analysis was performed to examine how the attitude of surface gullies and the structure of overburden affect face support resistance. The characteristics and evolution mechanism of strata behavior during FMTCC under gully slopes in a loess-covered gullied region were discovered through a mechanical analysis of the roof structure and a comparison to the mining of a typical shallow seam under gully slopes. The study found that as the FMTCC face advanced, the strata behavior initiated in the middle part of the face and then continued to both ends, and its intensity was higher in the middle part than in the upper and lower parts. During mining under gullies, the increases in support resistance were generally less than 5% (except for the maximum increases of 7-9%), indicating that the occurrence of gullies on the surface had little influence on the strata behavior at the FMTCC face. Due to the increased burial depth and the number of key strata, the roof at the FMTCC face under gullies formed a stable load-bearing structure called a voussoir beam, which was the key difference from the strata behavior characteristics in the shallow mine under gullies.

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Modelling of strata movement with a special reference to caving mechanism in thick seam coal mining

Cited by 168 publications

References 2 publications

Numerical simulation for direct shear test of joint in rock mass

Numerical simulation for direct shear test of joint in rock mass

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

Characteristics of Strata Behavior during Thick Seam Mining by Fully-Mechanized Top Coal Caving in a Loess-Covered Gullied Region

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