Modern Mining ›› 2024, Vol. 40 ›› Issue (03): 208-211.
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After a long time of rock dissolution in karst landform area，many underground karst caves and fissures are formed. These fissures will further expand and develop under the action of groundwater， which brings certain geological risks to underground engineering and mining activities. Aiming at the roof falling accident of hidden karst water roadway in fault fissure zone，taking the roof falling accident of 1080 return air roadway in Mill mine of Wengfu Phosphate Mine as the engineering background，the characteris⁃ tics of the roof falling site of roadway were expounded. The roadway support method of "steel arch advance pipe shed + filling concrete method" was comprehensively proposed. A roof falling treatment scheme includ⁃ ing construction technology，personnel configuration and mechanical configuration is formed. The risk sourc⁃ es during construction are analyzed，and the corresponding prevention and control measures and safety tech⁃ nical assurance measures are put forward. Finally，the reliability of the support scheme is proved through construction practice，which provides a reference for similar conditions of roadway roof collapse accidents.
