Analysis of sedimentation characteristics of coal slime deposits in drainage roadway of fully-mechanized caving face with large water silt
YANG Hao-bo
KOU Gao-yuan
YE Lei
LIU Ding
ZHAO An-xin
Abstract：In view of the the problem of water spraying in front of the mining face of Gaojiapu Coal Mine,the main source of water comes from the roof of the mining face,and the mine water inflow reaches 4 000～5 000 m3/h.Combined with the characteristics of coal mud and silt in the drainage roadway of the mining face,the settlement of coal mud mixture under different flow velocity conditions was simu-lated by COMSOL numerical simulation,including simulation of dynamic flow characteristics of coal slime deposits,simulation of settling of coal slime particles at different initial flow rates,influence of different initial flow rates on velocity distribution of coal slime mixture,influence of different initial flow rates on stability of coal slime mixture.By analyzing the volume fraction distribution of coal slime mix-ture particles at the section near the pipe outlet under different initial flow rates,the non-silting critical velocity of the coal slime mixture was determined to be between 1.2 m/s and 1.4 m/s,and the silting mechanism in the flowing process of the coal slime mixture was an-alyzed,so as to obtain the settling characteristics of the coal slime settlement,which could provide a theoretical basis for scientific and reasonable silting work.
Keywords：fully-mechanized caving facecoal slime depositsdrainage roadwaysettlement characteristic
Publication Date：2023-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 77-81,86 )