Research on hydraulic fracturing control collapse technology for initial mining and roof caving of working face under goaf
During the initial mining period of the working face under the goaf,sudden collapse of the roof can easily cause problems such as instantaneous gas outburst from the overlying goaf.Hydraulic fracturing technology can effectively weaken the roof and promote its timely collapse.However,the stress environment of the roof during the initial mining period under the goaf has the characteristics of low vertical stress and high horizontal stress,which can affect the fracturing effect by changing the expansion form of water pressure cracks.In response to this,the mechanism of weakening the roof through hydraulic fracturing during the initial mining of the working face under the goaf was revealed,and a hydraulic fracturing plan was developed and applied on site.To achieve slow and phased collapse of the roof during the initial mining period,the implementation effect was good.
initial mining and roof cavinghydraulic fracturing and roof cuttingroof collapseunder goafsectional collapse
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