Evolution Characteristics of Overlying Strata Fractures in Paste Composite Filling Stope

Paste composite filling mining (PCFM) is one of the effective ways to achieve water-preserved (preservation waterproof strata). To investigate laws fracture propagation overlying strata in PCFM stope, a kinematic model was established, which identified major determinants development fractures. Taking 112,201 working face test mine as research background, physical similar simulation, numerical computation, and theoretical analysis were combined analyze characteristics fractures under reaction between many factors (mining height, ratio, burial depth). The results show that larger height face, degree When smaller, are mostly distributed on both sides coal wall; when larger, wall upper part strata. paste ratio smaller Overlying wall. increases, it possible effectively control shallower depth is, faster developed. With increase depth, reduced, will finally tend be stable value. provide an important foundation for application localized technique mining, also complement theories mining.