中文摘要：

建立了煤矿底板渗流过程的力学模型，利用RFPA计算了当工作面推进到50m和100m时的渗透特性及渗流稳定性指数．研究表明：底板变形一渗流的耦合作用造成煤层底板边界随时间变化，边界变化到一定程度时形成导水通道；随着底板边界的变化，导水通道与各岩层之间的交集的渗透特性也发生变化；当任一导水通道经过的岩层渗透特性满足一定关系时，发生突水．当煤矿回采工作面推进到50m时，FWI为0．834，底板中水渗流是稳定的，不会发生突水；当工作面推进到100m时，FWI为0．928，接近1，这意味着底板可能产生渗流失稳现象．

英文摘要：

A dynamical model for the seepage flow in a coal-seam-floor is established. A soft ware, RFPA is used to work out the displacement, stress and strain fields on which the seepage properties and the factor of water inrush（FWI） are calculated when the workface advances to 50 m and 100 m respectively. This study shows that, the boundary of the coal-seam-floor changes with the time because of the coupling action between the deformation and seepage flow, and a channel foe water pass through conforms when the boundary changes to a certain extent; As the boundary change, the seepage properties of the intersection set between the water flowing channel and every stratum change at the same time; when the seepage properties of any water flowing channel meet with a certain relationship, water inrush will take place; When the work face advanced 50 m, the factor or water inrush is FWI=0. 834, and the seepage is stable, and no water inrush take place; but When the work face advanced 100 m, FWI=0. 928, i. e. , the factor or water inrush approaches to 1,it means the seepage flow in the coal-seam-floor may be instable.