Mechanism and practice of support release of mining roadway about fully-mechanized top-coal caving mining stope
Abstract：In order to prevent the initial caving step distance of roof from increasing and a larger range of face end hanging roof,based on the importance of safe and efficient production of 2203 working face in Zhangcun Mine,used theoretical analysis,numerical simulation and field test methods to analyze changes of the state of mining roadway before and after support release,abutment pressure distribution and yield zone of coal pillar,the movement and destruction of the surrounding rock about adjacent roadway,and so on.Studied on the mechanism,method and technique of bolt support release of bolt and anchor.The results show that using support release can decrease the initial caving step and increase the initial caving quality of coal.And the pressure of coal pillars can be reduced,which change the stress state of coal pillar near the working face and improve the strength of the whole pillars.It also can recycle the anchors,cables and combination.In the 2033 working face,more than 90% of recoverable anchors are successfully recovered and the pallet and steel belts of unrecoverable anchors（cables） are recovered by and large.In addition,the initial caving step decreases 8 m and the initial caving quality of coal increases 7 311 t.
Keywords：fully-mechanized top-coal caving mining stopemining roadwaybolt support releasepillar yield zoneabutment pressure
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)