Abstract: In order to prevent Karst collapse column conducting ordovician limestone water and making great mine flood, the basic characteristics of Karst collapse column in Shuangliu coal mine are studied by geometric parameters, development characteristics, precursory and distribution characteristics through theoretical analysis and field observation. It indicates that Karst collapse column mainly develops in shallow parts with small faults, while the attitude of coal and rocks is mainly distributed within ordovician limestone Karst dissolution pore and cave development region. Taking X15 Karst collapse column from 220 working face in Shuangliu coal mine as an example, the water inrush risk is analyzed by FLAC3D during mining upper coal group when there is Karst collapse column. The results show that: with working face moving forward, plastic failure fields, stress and seepage field of surrounding Karst collapse column begin to change. When the face moves to 30 m from the Karst collapse column, the plastic failure fields and seepage field begin to contact with each other, and with the face advancing, it extends to heavy water inrush risk.

Key words: Karst collapse column, development characteristics, numerical simulation, water inrush risk