Analysis on reverse fault activation and water inrush possibility for coal mining above confined aquifer in a mining area
Abstract：According to the geological characteristics of 732 working face in a mining area,a mechanical model was built,and the expression for normal stress and shear stress on the fault was given respectively.By calculating the normal stress and shear stress on F16 reverse fault in excavation process,it is obtained that additional normal stress and additional shear stress is produced.Additional normal stress makes the tensional fracture emergence and development within F16 fault,while additional shear stress makes the shear fracture opening within F16 fault and makes shear joint opening on both parts of F16 fault.These results lead to water permeability improved within F16 fault.On this basis,failure distribution of coal roof and seepage feature of coal floor was simulated by using RFPA2D-Flow software.The results show that there is no connected fracture channel between aquifer on other part and working face in excavation process,because the shallow depths of F16 reverse fault is compactly closed and shale on coal floor isn＇t destroyed.Ordovician limestone water can＇t burst into working face and the seepage flow on coal floor is not enough to lead to water inrush accident.
Keywords：coal mining above confined aquiferreverse faultfault activationwater inrushOrdovician limestone waterRFPA2D
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)