The Stable Analysis And Apprisal Underground Vacant Place In Da-ling Iron Ore Of Feng-cheng City

With the swift development of the national eccnomy, mineral resources dries up gradually, but our country is actually increasing the demands of the raw material year by year, therefore pillar recovery is the urgent problem which our country mine faces,is directly related to the sustainable development of the mine,it is meaningful to research the recovery of the metal pillar and the roof.this article combines the pillar and roof recovery practice underground vacant place of da-ling iron ore ,this article has carried on the comprehensive analysis and the appraisal to underground vacant place stability of the da-ling iron ore which applied limit balance method of the rock mechanics and numerical simulation and so on.Through the limit balance method,it is obtained before and after pillar recovery that the smallest safety coefficient of the pillar is 7.60 as well as 8.80 on the roof.it is also obtained that the smallest safety thickness of the roof is 7m.by the simulation of ADINA,it can be obtained that the underground vacant place is stable before and after the recoveryof pillar and roof.By the analysis of this article,it can be concluded that the pillar and the roof remain stable in the process of recovery.it is also Simultaneously provide the reliable proof for recycling the mineral resource scientificly and safely.at the same time,it also provide a improtant reference value for the similar mine to recycle the pillar and the roof under the vacant region.