Study On The Support Technology Of The Rodaway In The Loose Coal Seam Below Close Range Goaf

Present bolting support technology has basically solved the support problem of normal coal roadway in the place of which has the relatively superior surrounding rock condition in the depth below -500~-600m, has less prominent tectonic stress. However, in the complex condition using present bolting support technology in the coal roadway doesn't have the ideal results.The dissertation adopt the theoretical analysis,numerical simulation combined the industrial experiment to carry out technology research.In the base of ananlyzing the present support theory and technology,the roadway's floor stress field and the deformation breakage character in the loose coal seam below close range goaf have been researched,the main factor which affect the surrounding rock's support pressure below the goaf has been analyzed,the basic support idea of this kind roadway and the pertinence control technique have been proposed : weaking water's affection,improving the surrounding rock performanceby grouting in the surrounding rock,adopting the high-enforced pre-stress support system for the roof's initial support strength and the key sites'support should be reinforced for effectively controlling the roadway's deformation and ensuring the roof's safty.In the end,combined with the specific condition of the 7223 roadway in xutuan mine,the industrial experimental research has been carried out,the support schem is novel,believable,has the low cost and the convenience for the construction.It has gained the favorable technical safty and social economic effect,also provides the favorable reference for widely using the technology in the similar geological condition.