Mechanism study on roadway surrounding rock failure and lag water inrush
The exploitation of Northern China type coal mine is under great threat of the floor confined water,one of the common produc-tion safety accidents in mines is the lag water inrush of confined water after roadway excavation.To decrease the lag water inrush acci-dents in roadways and achieve safe and efficient mining of coal seams threatened by confined water from the floor,mechanical analysis theory was used to establish mathematical analysis models and numerical simulation models.Relevant theories of engineering geology and hydrogeology were applied to derive and analyze.The research results indicate that:after the completion of roadway excavation,the bottom foot was the area with the largest range of damage;stress unbalance was the main cause of underground rock failure;the change of stress could lead to energy out-of-balance resulting in the floor confined water been risen;the mollification effect of water on rocks was a key factor causing lag water inrush.A method was proposed to strengthen roadway supporting and grouting to transform the bottom structure of the waterproof layer that has been damaged by confined water during roadway excavation,in order to prevent the problem of lag water inrush during roadway excavation.This has pointed out a new direction for preventing mines with high pressurized aquifers on the floor and the risk of lag water inrush.
roadwaylag water inrushrock mollificationreinforced supportinggrouting
万方数据
维普
