Stability Analysis of Surrounding Rock Structure in Deep Gob-side Roadway of Xinji No.2 Mine
In order to identify the structure characteristics and stability of the surrounding rock of the deep gob-side roadway in Xinji No.2 Mine,theoretical analysis,numerical simulation and others are used to analyze the key parameters and characteristics of the gob-side roadway surrounding rock in the 08 working face.The elastic-plastic changes and stress evolution laws of the surrounding rock during excavation along goaf and stoping period are simulated,and the prevention and governance method of"pressure relief-detection"of surrounding rock of high stress roadway by large diameter drilling and drilling debris method is put forward.The research shows that the"coal pillar-roof"structure is the key factor in controlling the stability of the surrounding rock of the deep working face roadway.The main parameters affecting this structure are the width and stress state of the coal pillar,the position of the basic roof fracture line,the lateral fracture span and its movement form of key rock blocks,etc;The 10 m coal pillar reserved in the ventilating roadway along goaf in the deep 08 working face of Xinji No.2 Mine is in a plastic state,which can form a stable"coal pillar-roof"structure with the roof and roadway.Neither roadway excavation nor stoping will induce instability of the coal pillar and roof.
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