Construction Scheme and Application Effect of Huayingshan Tunnel Going Through Steep Inclined Coal Seam Goafs
Based on the real engineering of Huayingshan tunnel going through the coal seam goafs in Gaodingshan mine,survey technology and excavation support strategies of complex goafs are investigated.To analyze the safety of tunnel structures,a three-dimensional numerical analysis model is constructed when tunnels cross through steep inclined coal seam goafs.Combined with the application,construction technology of tunnels traversing steep inclined coal seam goafs is evaluated.The results show that:1)Advanced geological drilling technique can accurately determine the spatial location,harmful gases and fillings of coal seam goafs.Furthermore,it can provide guidance for the prediction of potential construction risks.2)After taking advanced large pipe shed and curtain grouting measures,the surrounding rock is comparatively stable during the tunnel construction phase and there are no occurrences of rock falling or collapse.Moreover,the construction was successfully completed.
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