Research on Reinforcement Parameters and Optimal Lifting Position of Reinforced Concrete False Roof in Downward Filling Method
The rationality of the artificial false roof construction plan is the key and core link to achieve safe and efficient downward filling and mining of steeply inclined broken ore bodies.This study takes the reinforced concrete artificial false roof of a copper mine as the research object.Based on thin plate theory and elastic mechanics and combined with the actual down-ward approach filling and mining technology,an equivalent mechanical model of the artificial false roof is established to analyze the reinforcing parameters of the reinforced concrete artificial false roof,determine the parameters of the bottom bars,the pa-rameters of the hanging bars and the position of the hanging points:at least 104 main bars need to be arranged on the 30 m long false roof along the vein;at the same time,oblique hanging bars are used to hang the main bars 0.8 m away from the side rails,and the upper and lower side panels are designed to be lifted If the spacing between the bars is 500 mm,then there will be 60 inclined hanging bars on the upper and lower plates respectively;the optimal hanging position of the hanging bars is 0.2～0.25 of the span of the artificial false roof from the end,where the stress on the hanging bars is reasonable and relatively economy.This study provides calculation ideas and engineering reference for the design of reinforced concrete artificial false roof rein-forcement and suspension reinforcement scheme.
downward filling methodartificial roofreinforced concretereinforcement parametershanging bar position
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