Abstract
After presupporting of roof, overlying roof bending deformation law has undergone greatly changed. In order to accurately calculate the top roof of artificial roof movement law after the roof pre-control top. Based on the analysis of the top moving characteristics of the roof and the theory of elastic foundation thin plate, the mechanics model of pre-control top-mining filling body-artificial roof-roof is established. The basic deflection, stress equations and the critical conditions of roof breaking are derived. The impact of roof bending deformation of the key factors affects the artificial roof thickness and elastic modulus. Combination of Wo Hu Shan specific engineering conditions, the calculation equation of tensile stress and sinking displacement of lying tiger hill is deduced and the critical roof thickness is 1.87m. To retain a certain safety factor, the artificial roof thickness of 2.5m is used. The monitoring results show that the maximum roof displacement is 15.80mm, which is consistent with the theoretical calculation.
Published Version
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