水力冲孔有效影响半径数值模拟

Numerical Simulation on Effective Influence Radius of Hydraulic Flushing Borehole

摘要: 根据力学平衡方程和质量守恒定律及煤层渗透率、孔隙率、煤岩体积应变等参数的关系,建立了煤层底板巷水力冲孔气固耦合方程。通过模拟不同出煤量的水力冲孔有效影响半径变化,得出水力冲孔有效影响半径随冲出煤量和抽放时间的增加而增加。当冲出煤量为1 t/m时,有效影响半径为5.8 m,卸压增透效果十分理想。
- 水力冲孔 /
- 数值模拟 /
- 有效半径 /
- 耦合方程
Abstract: According to the relationships among mechanics balance equation,the law of conservation of mass,permeability of coal seam,porosity,volume strain of coal,the gas-solid coupled equation of hydraulic flushing borehole in the coal seam floor is established.By simulating the changes of effective influence radius of hydraulic flushing borehole at different coal output,it obtains that the effective influence radius of hydraulic flushing borehole is increasing as the amount increasing of overflow coal and prolonging of drainage time.When the amount of overflow coal is 1 t/m,effective influence radius is 5.8 m,the effects of pressure relief and antireflection are very good.
- hydraulic flushing borehole /
- numerical simulation /
- effective influence radius /
- coupled equation

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