煤岩体内孔裂隙的发育状况对注水渗流的影响占主要因素，随着工作面的推进，采动应力会造成煤层孔裂隙结构的改变。为探究采动过程中煤岩孔裂隙的变化规律，在三轴压缩实验的基础上，利用体积变形表征煤岩孔隙体积变化随应力加载的演化过程，应用Fluent自定义函数（UDF）对孔隙体积随加载时间的变化关系进行编程，以开采时间及注水时间为轴，数值模拟分析采动应力对煤层注水渗流场的影响作用；对比不同应力加载阶段相同时间增量的煤体内钻孔附近渗流场的渗透压力、渗流速度及注水量的变化。结果表明：在相同时间增量条件下，压密阶段、体积膨胀阶段、变形破坏阶段煤体内钻孔周围水压与含水量依次增加，注水润湿范围逐渐增大；采动应力对注水渗流具有重要的影响。

The development of fractures and pores in coal is the main factor affecting the seepage of water injection. With the advance of the working face, the mining stress will cause the change of coal seam pore fracture structure. In order to explore the change law of pore and fracture in coal during mining, based on triaxial compression experiment, volume deformation is used to characterize the evolution process of pore volume change with stress loading. Fluent custom function （UDF） is applied to program the relationship between pore volume change with loading time. Taking mining time and water injection time as axes, the effect of mining dynamic stress on seepage field of coal seam water injection is analyzed by numerical simulation. By comparing the changes of seepage pressure, seepage velocity and water injection in the seepage field near the borehole in different stress loading stages with the same time increment, the results show that under the same time increment condition, the water pressure around the borehole increases successively, the water content around the borehole increases successively, and the water injection wetting range expands successively in the compaction stage, volume expansion stage, deformation and failure stage. It can be seen that mining stress has an important influence on water injection seepage.