煤层底板破坏流固耦合数值模拟

根据煤层底板含水层具有不均一性的特点，建立了底板含水层非均布水压力学模型和流固耦合模型，并根据"下三带"理论和弹塑性理论求得了底板保护带突水极限压力的弹性解和塑性解。利用FLAC3D软件对工作面采动底板进行了流固耦合数值模拟，并对煤层采动底板的应力破坏特征以及渗流特征进行了研究。综合采用理论计算和数值模拟的方法对煤层底板进行了突水预测。研究表明:非均布水压模型更符合工程实际，数值模拟方法可以快捷、准确的对煤层底板突水进行预测，对水害防治具有重要意义。 

Fluid-solid coupling numerical simulation of coal seam floor failure

Aimed at the heterogeneous characteristics of aquifer in floor, the paper established a non uniform hydrostatic mechanical model and a fluid-solid coupling model for aquifer in floor. According to the "three zone" theory and elastic-plastic theory, it obtained the elastic and plastic solutions for limit pressure of water inrush in protection zone of floor. We used the software FLAC3D to carry out numeric simulation of fluid-solid coupling of the disturbed coal face, studied deeply the characteristics of stress destruction and infiltration in the floor disturbed by coal mining. Theoretical calculation and numerical simulation method were used to predict water inrush in coal seam floor. Research shows that the non uniform pressure model is more consistent with the engineering practice, numerical simulation method can be fast and accurate to forecast water inrush. It is of great significance for water hazard control.