某铁矿隔水护顶矿柱厚度计算及安全影响预测

科学合理地确定矿山隔水护顶矿柱安全厚度是矿山安全生产的前提条件，为保障某铁矿地表民房、道路等建（构）筑物安全，防止矿山开采过程中产生的导水裂隙带贯通第四系含水层，采用荷载传递交汇线法、K.B.鲁别涅依他估算法和冒落带、导水裂隙带高度估算法3种理论分析方法对隔水护顶矿柱厚度进行计算，并利用数值模拟手段对留设隔水护顶矿柱后的开采过程安全影响进行了分析，对理论计算结果进行了验证。3种理论计算方法得出的隔水护顶矿柱厚度分别为14.3～17.3 m、17.5～31.4 m和41.8～57.4 m，推荐隔水护顶矿柱留设厚度为60 m。通过数值模拟分析得出，在留设60 m厚的隔水护顶矿柱的基础上，开采区域和隔水护顶矿柱位置产生的最大拉应力约0.47 MPa，矿山开采不会对隔水护顶矿柱造成破坏；地表产生的最大水平位移约5.8 cm，最大垂直位移约26.5 cm，最大倾斜为1.70 mm/m，最大曲率为0.20 mm/m2，最大水平变形值为0.70 mm/m，满足相关规范要求，预测矿山开采不会造成地表建（构）筑物破坏。

Thickness Calculation and Safety Impact Prediction of an Iron Mine′s Water proof Pillar#br#

Scientifically and reasonably determining the thickness of the mine′s water proof pillar is a prerequisite for safe production in the mine,which can protect the safety of houses and roads on the surface and prevent the generation of water conducting fissures that can penetrate the Quaternary aquifer during mining.The load transfer intersection line method,K.B.Lubeneyita estimation method,and fracture zone height estimation method are used to calculate the thickness of the water proof pillar.The thicknesses obtained by the three theoretical calculation methods are 14.3～17.3 m,17.5～31.4 m and 41.8～57.4 m respectively,so the thickness of the Water proof pillar is 60 m.Numerical simulation shows that under the premise of a 60 m thick water proof pillar,the maximum tensile stress generated in the mining area and pillar is about 0.47 MPa,and mining will not cause damage to the water proof pillar.In the simulation results,the maximum horizontal displacement of the ground surface is about 5.8 cm,the maximum vertical displacement is about 26.5 cm,the maximum tilt is 1.70 mm/m,the maximum curvature is 0.20 mm/m2,and the maximum horizontal deformation value is 0.70 mm/m,which meets the relevant specifications Requirements to ensure surface safety.