Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structural Slip Model for Coal Bumps and the Effect of Coal Weakening Under Three-Hard Condition
Abstract Coal bump refers to a sudden catastrophic failure of coal seam and coal burst into underground mining roadway, while typical shallow-focus coal bumps in China generally happened under a three-hard strata structure. In order to clarify the mechanism of coal bumps caused by mining effect under the condition of hard coal-rock strata structure, a modified structural slip model is built considering coordinated deformation of roof and floor. The practical parameters of the Xinzhouyao coal mine are used to prove the validity of the model, then the vertical stress and the state of plastic zone under high stress are discussed with different strength reduction coefficients. The results show that the length of plastic zone is 1.5 m, 1.8 m, 2.3 m, 2.9 m respectively when the lateral pressure coefficient is 0.6, 0.9, 1.2, 1.5, with vertical peak stress ranging from 21.5 to 14.1 MPa, and that the model could well reflect the stress distribution and bump risk with stress status. By discussing the effect of weakening of coal seam, the structural slip mode of coal seam induced by mining effect are evaluated, the model can provide support for following risk evaluation and control.
Structural Slip Model for Coal Bumps and the Effect of Coal Weakening Under Three-Hard Condition
Abstract Coal bump refers to a sudden catastrophic failure of coal seam and coal burst into underground mining roadway, while typical shallow-focus coal bumps in China generally happened under a three-hard strata structure. In order to clarify the mechanism of coal bumps caused by mining effect under the condition of hard coal-rock strata structure, a modified structural slip model is built considering coordinated deformation of roof and floor. The practical parameters of the Xinzhouyao coal mine are used to prove the validity of the model, then the vertical stress and the state of plastic zone under high stress are discussed with different strength reduction coefficients. The results show that the length of plastic zone is 1.5 m, 1.8 m, 2.3 m, 2.9 m respectively when the lateral pressure coefficient is 0.6, 0.9, 1.2, 1.5, with vertical peak stress ranging from 21.5 to 14.1 MPa, and that the model could well reflect the stress distribution and bump risk with stress status. By discussing the effect of weakening of coal seam, the structural slip mode of coal seam induced by mining effect are evaluated, the model can provide support for following risk evaluation and control.
Structural Slip Model for Coal Bumps and the Effect of Coal Weakening Under Three-Hard Condition
Ning, Wang (Autor:in) / Yaodong, Jiang (Autor:in) / Xiaolong, Zhou (Autor:in) / Dengyuan, Zhu (Autor:in)
2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
Structural Slip Model for Coal Bumps and the Effect of Coal Weakening Under Three-Hard Condition
| Online Contents | 2019
Rock bumps. Roadways. Numerical methods. Hard coal mining
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Numerical simulation of coal seam joints and stiffness effects on coal bumps
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