Synergies Support Technology for Large Section Coal Roadway with Thick Complex Roof

To solve support difficult problem for the 2513 coal roadway with thick layer complex roof of Chensilou Coal Mine, we analyze the stability of surrounding rock of roadway including that the migration process can be drawn into the roof interlayer slip, flex separation, instability caving in three stages, and the determining factor for the stability of the both side is the width of the limit stress balance area. According to rock the situation, we use a rope ladder to the roof bolt support technology and the coal side anchor beam supporting active control technology as the core technology. Mine pressure observation showed that the maximum amount of subsidence for the roof is 73 mm, the maximum closer capacity of two groups is 147 mm, 2 m basic point separation capacity is 19 mm,6 m basic point separation is 33 mm, wich contros the roadway effectively and meets production needs.