Discrete element modelling of deformation and damage of a roadway driven along an unstable goaf — A case study

Gao, Fuqiang; Stead, Doug; Kang, Huan; Wu, Yan

doi:10.1016/j.coal.2014.02.010

Cited by 79 publications

(33 citation statements)

References 18 publications

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“…The main material parameters of lithology are listed in Table 3. In addition, the mechanical and physical properties of the contacts between every two layers are described in [33]. …”

Section: Geological Conditions Of Gatewaysmentioning

confidence: 99%

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Assessment of Excavation Broken Zone around Gateways under Various Geological Conditions: A Case Study in Sichuan Province, China

Yang

Cao

et al. 2016

Minerals

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Abstract:To study common failure characteristics of gateways, a total of 55 typical gateways at coal mines, in Sichuan Province, China, were selected for investigating the rules of broken widths based on the ground-penetrating radar (GPR) technique and numerical model. Results indicated that the broken width values around the gateways were larger than 1.5 m, and those in the roof and high side wall were larger than those in the low side wall, as a whole. The width values had close relationships with the thickness of the coal seam and immediate roof, angle of the coal seam, and depth of the gateways. Furthermore, combined with the plastic zone of numerical models in 3-Dimensional Distinct Element Code (3DEC) and the broken width, we obtained the excavation broken zone (EBZ) cross-section diagram for each gateway and determined that the EBZ appeared to have a basically elliptical shape-with the long axis along the seam inclination direction and the short axis along the vertical direction of the rock layer-and that this elliptical shape was only slightly affected by the gateway cross-section shape. It was observed that the failure extent was greater in the seam inclination direction than in the vertical direction of the rock layer. Obviously, the gateways presented asymmetric failure characteristics and implied that an asymmetric support system should be provided when using bolts, cables, and shotcrete combined with steel mesh and steel belts. Such a support system could improve material parameters and form a combined arch structure in surrounding rocks, with arch crown and arch springing thicknesses that are larger in the roof and high side wall.

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“…The main material parameters of lithology are listed in Table 3. In addition, the mechanical and physical properties of the contacts between every two layers are described in [33]. …”

Section: Geological Conditions Of Gatewaysmentioning

confidence: 99%

“…The physical and mechanical parameters of each mode material were obtained from the investigation (seen Section 2.1) and obeyed the Mohr-Coulomb shear failure criterion and tensile failure criteria, and the following yield criterion (Equations (4) and (5)) was used. The contact obeyed the Coulomb Slip model [33]. …”

Section: Steps For Obtaining Ebzmentioning

confidence: 99%

Assessment of Excavation Broken Zone around Gateways under Various Geological Conditions: A Case Study in Sichuan Province, China

Yang

Cao

et al. 2016

Minerals

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“…In recent years, the failures of rock-roof and the collapse of surface are more frequent which severely damages to people and mining [1][2][3]. In these mine disasters, the air shock wave is one of typical forms with the characteristic of high velocity, high pressure, huge impact force and short application time [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Two-phase Model of Air Shock Wave Induced by Rock-fall in Closed Goaf

Ren¹,

Liu²,

Cao³

et al. 2016

Preprint

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“…In recent years, the failures of rock-roof and the collapse of surface happened more and more frequent which have severely damaged to people and mining [1][2][3]. In these mine disasters, the air shock wave is one of typical forms with the characteristic of high velocity, high pressure, huge impact force and short effective duration [4].…”

Section: Introductionmentioning

confidence: 99%