Research on critical flow velocity of coal mud deposits in drainage roadway of fully-mechanized caving face with large water prone siltation
According to the water leaching problem in front of the fully-mechanized caving face of Gaojiapu Coal Mine,the main source of water comes from the roof of the coal face,and the mine water inflow reaches 4 000-5 000 m3/h.Combined with the characteristics of coal mud deposits in the drainage roadway of the mining face,The rheological type and constitutive equation of the coal mud mixture were determined by Robinovitch-Moner equation and Hagen-Poiseuille equation,and the flow model of the coal mud and water mixture was established by large-scale loop experiment method.The sedimentation characteristics of coal mud deposits in the drainage roadway of working face in the high and low pressure section and at different shear rates were analyzed theoretically.The critical flow velocity of coal mud deposits flow under the condition of dynamic water was calculated as 1.1-1.5 m/s,and the critical flow velocity of coal mud deposits was obtained.The sedimentation mechanism of coal mud in the process of mine water flow was studied,providing theoretical ba-sis for scientific and reasonable dredging work.
large water prone siltationfully-mechanized caving facea surge of watercoal mud depositscritical low velocity
万方数据
维普
