Abstract
Subsidence deformation of the bottom rock stratum of the bending belt was different due to deflection difference; the separation stratum space was easy to form between the soft and hard rock stratum, and the separation stratum water formed under the water supplies. Based on catastrophe theory and the mechanics theory, the pointed catastrophic model of key stratum (the rock beam structure overlying the separation stratum space) was established. The impact energy released by the key stratum breaking was calculated. The “crushing” modes and “cleavage” modes of separation stratum water-inrush were proposed under the impact energy of key stratum. The periodic step distance of two kinds modes of separation stratum water-inrush was calculated. At last, separation stratum water-inrush of extra-thick coal of Guo Jiahe mine was taken as an example to study, and the aim was to provide technical reference for the prevention and treatment of separation stratum water-inrush.
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