STUDY ON BED-SEPARATED FISSURES OF OVERLYING STRATUM AND INTERSTICE PERMEABILITY IN FULLY-MECHANIZED TOP COAL CAVING
综放开采覆岩离层裂隙变化及空隙渗流特性研究

Based on the model test of simulated material, the distribution of bed separated fissures is measured in the process of fully mechanized top coal caving.The analytic formulas of eqaivalent areas of bed separated fissures are calculated both ahead of and behind initial rupture of the key strata, and the analytic formulas of interstice permeability coefficients are also calculated for different fissure district. By in situ observation and monitoring in working face 110 # of Weijiadi coal mine, Jingyuan ming bureau, the interstice permeability of gob fissure region is studied.