Sensitivity Analysis of Mechanical Parameters of Different Rock Layers to the Stability of Coal Roadway in Soft Rock Strata

According to the geological characteristics of Xinjiang Ili mine in western area of China, a physical model of interstratified strata composed of soft rock and hard coal seam was established. Selecting the tunnel position, deformation modulus, and strength parameters of each layer as influencing fac...

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Bibliographic Details
Published in:TheScientificWorld 2013-01, Vol.2013 (2013), p.1-8
Main Authors: Yan, Ji-xing, Gao, Xin, Wang, Wei-ming, Zhao, Zeng-hui
Format: Article
Language:English
Subjects:
Animals
Anthozoa
Coal
Coal industry
Coal mining
Deformation
Finite element method
Floors
Geology
Influence
Lithology
Mechanical properties
Models, Theoretical
Modulus of deformation
Nonlinear analysis
Parameter sensitivity
Plastic deformation
Regression analysis
Regression models
Road maintenance
Sensitivity analysis
Stability analysis
Strata
Transportation
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Summary:According to the geological characteristics of Xinjiang Ili mine in western area of China, a physical model of interstratified strata composed of soft rock and hard coal seam was established. Selecting the tunnel position, deformation modulus, and strength parameters of each layer as influencing factors, the sensitivity coefficient of roadway deformation to each parameter was firstly analyzed based on a Mohr-Columb strain softening model and nonlinear elastic-plastic finite element analysis. Then the effect laws of influencing factors which showed high sensitivity were further discussed. Finally, a regression model for the relationship between roadway displacements and multifactors was obtained by equivalent linear regression under multiple factors. The results show that the roadway deformation is highly sensitive to the depth of coal seam under the floor which should be considered in the layout of coal roadway; deformation modulus and strength of coal seam and floor have a great influence on the global stability of tunnel; on the contrary, roadway deformation is not sensitive to the mechanical parameters of soft roof; roadway deformation under random combinations of multi-factors can be deduced by the regression model. These conclusions provide theoretical significance to the arrangement and stability maintenance of coal roadway.
ISSN:2356-6140
1537-744X
DOI:10.1155/2013/869040