Mechanical model of deformation-seepage-erosion for Karst collapse column water inrush and its application
With the extension of coal mining in China,fault water inrush has become one of major disasters threatening the safety of coal mine production.Based on the research results related to the mining-induced fault water inrush,this pa-per proposes a conceptual model of water inrush caused by the erosion synergy of mining-induced rock mass damage rup-ture and fractured rock mass(fault),derives the permeability evolution equation of the two media,and systematically con-structs the cooperative disaster causing mechanism model between mining failure and particle erosion inside faults.The numerical simulation is conducted to study the deformation and failure of rock mass,the particle transport in faults and the evolution characteristics of seepage channel,and systematically explain the temporal and spatial evolution mechanism of seepage catastrophe caused by mining-induced fault inrush.The results show that:①With the continuous advancement of working face,the damage field of mine floor rock mass is connected with the fault erosion fracture,forming a seepage path of aquifer-fault-mining fracture-working face,and with the increase of erosion time,it finally develops into several dominant water diversion channels,resulting in a sharp increase in water inflow at the working face and a lagging water inrush.②With the increase of seepage time,the water inflow and fracture opening degree inside faults all show three stages:slow change,sudden increase and stable,and the erosion particle concentration shows a trend of first increasing and then decreasing.③Under the geological conditions of the mining area studied in this paper,in order to prevent the oc-currence of fault water inrush,the methods such as advanced grouting or leaving water prevention coal pillars can be adop-ted,and the advance grouting time should be before the bottom plate fracture zone connects faults,if grouting is not ap-plied,the width of the reasonable water prevention coal pillar should not be less than 20 m.
fault water inrushquarried rock masserosionwater inrush channels
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