| Autor: |
Wang, X., Zhou, W., Yang, L., Wang, T., Xiao, X., Zhou, L. |
| Zdroj: |
Continuum & Distinct Element Numerical Modeling in Geomechanics - 2013 (Proceedings of the 3rd International FLAC / DEM Symposium); 2013, p1-6, 6p |
| Abstrakt: |
Hydraulic fracturing technique has been widely used to extract and release gas in coal mining practice. By means of the particle flow code PFC2D, a number of numerical models have been established to investigate the factors that may influence crack propagation during hydro-fracturing. The findings are presented as: crack patterns are governed by in-situ stress regimes; the number of cracks is positively correlated with the injection pressure; crack length increases with coal permeability and also with Young's modulus as well as Poisson's ratio. On the other hand, crack propagation is slightly impacted by shear strength when the coal appears less fractured with high tensile strength. In conclusion, the orientation and size of cracks are mainly governed by the factors including in-situ stress regime, tensile strength, permeability, as well as Young's modulus, Poisson's ratio, and shear strength of the coal, in addition to injection pressure. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
