煤层开采导水裂隙带发育高度分析

o address the issue of development height of water flowing fractured zone in coal seam, a new calculation formula was proposed based on the length of working face, lithology, and fractured boundary angle of overlying strata etc. Firstly, the Flac3D simulation software was used to prove the important influence of the length of working face on the development height of water flowing fractured zone. And then based on the theory of dynamic stress equilibrium formed by expanded filling of ruptured rock mass, the formula of calculating the development height of water flowing fractured zone was derived by solving differential equation. The calculated result was compared with that from in-situ measurement, good agreement can be found. And it is also indicated that our proposed formula is even more accurate than the empirical formula, which implies that it can be used as a useful reference method to calculate the height of water flowing fractured zone.