With the extend of mining in depth and scope, the coal bed of lower Taiyuan Formation is more and more threatened by confined water of floor. It is one of mainly tasks that mine in safely, highly yield and efficiency that threaten by confined water in China.This paper studied the mechanism of water-inrush and water-inrush prediction on Panxi coalmine. Firstly, based on the analysis of geology and hydrology and water-inrush from coal bed floor date of Panxi coalmine, generalized the "six factor theory" which affect water-inrush from coal bed floor. Secondly, analyzed stress state of the coal bed floor and movement feature of coal bed top layer and floor, comprehensively studied the depth of destroyed floor in deeper level mine with theoretical analysis, numerical simulation and actual measurement in situ. Based on the date of water-inrush of mined in deep level, summarized the empircal formula of the depth of destroyed floor. Analyzed the reason and influential factor and ascertainment method on the depth of original damage zone and mined damage zone. Studied on obstruction performance of coal bed floor and applied it to Panxi coalmine. Studied on dynamic mechanism of water-inrush from coal bed floor and analyzed the mechanism of water-inrush faulted floor, include the water-inrush of original fault and activated fault by mined, another studied the development mechanism of fault with mechanics. At last, used more factors compositing theory, brings forward the model of water-inrush to forecast water-disaster problem in coal mine and applicable software to predicate water-inrush from mining floor is made.
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