Abstract: To study the relation between the maximum height of water flowing fractured zone and mining parameters, combining with the generalized damage-factor definition of interlayer stratum and water flowing fractured zone, and assuming that two elliptical arcs could be used to fit the subsidence curve of rock-soil layer above the water flowing fractured zone, the relation among mining height, bedrock thickness, loading layer thickness and generalized damage factors of water flowing fractured zone were deduced, which simplified the calculation method of determining the maximum height of water flowing fractured zone. The results show that there is a great relationship between the maximum height of water flowing fractured zone and mining parameters, and the mining parameters must be considered when determining the height of water flowing fractured zone. Meanwhile, the applicability and reliability of the calculation method has been proved by engineering instances, which provides theoretical foundation for the further study on water conservation mining.

Key words: probability distribution, water flowing fractured zone, mining parameter, water-preserved mining