E3S Web Conf.
Volume 198, 20202020 10th Chinese Geosynthetics Conference & International Symposium on Civil Engineering and Geosynthetics (ISCEG 2020)
|Number of page(s)||4|
|Section||Geosynthetics Applied Design Theory and Method|
|Published online||26 October 2020|
Coupling numerical model of hydraulic fracturing seepage in soft coal based on elastoplastic damage
1 Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400037, China
2 State Key Laboratory of The Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
* Corresponding author: firstname.lastname@example.org
In order to guide the field application of hydraulic fracturing of soft coal in coal mine, based on the elastic-plastic damage theory, the coupling numerical model of soft coal hydraulic fracturing seepage was studied. The porosity strain relationship equation, permeability strain relationship equation, the relationship between permeability and volume plastic tensile strain and volume plastic shear strain of coal and rock mass are derived, and the plastic correction equation and softening parameters are defined. The stress coupling equation and yield criterion are programmed and embedded into the finite difference software FLAC3D for numerical solution. The numerical simulation shows that the numerical calculation model of soft coal hydraulic fracturing conforms to the actual law, and the field fracturing radius investigation experiment is consistent with the numerical simulation results.
© The Authors, published by EDP Sciences 2020
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