隔离层是确保露天转地下安全开采的关键,为确定姑山铁矿安全隔离层厚度,运用Ansys有限元分析软件进行数值模拟.首先对相同跨度(27.5m)不同隔离矿柱厚度与采空区高度的规则采空区进行数值模拟,优选采空区控顶高度为16m.对不同跨度和不同隔离矿柱厚度进行数值模拟,得到了不同跨度下的安全隔离层厚度.选择5种具有代表性的理论计算方法计算隔离层的安全厚度,其结果与数值模拟结果趋于相同.最后结合理论计算结果,给出各个跨度下的安全隔离层厚度.以姑山铁矿为例,推荐其露天转地下开采的隔离层厚度为18m.

Interval layers are a key to ensure the safety of the transition from open pit to underground mining. Through simulation, finite element software is used to get the safety thickness of interval layers for Gushan Iron Mining. Firstly, a numerical simulation is carried out by using the software of ansys on several regular goaf models which have the same span(27.5m), but different thicknesses of ore pillar and different heights of goaf, optimally selecting the goaf height as 16 meters. Then, numerical simulation are created on other goaf models with different spans and thicknesses of interval layers and safety thickness of interval layers are obtained for these cases. Then five typical theoretical calculation methods are chosen to calculate its safety thickness. The result is similar with the former one. At the last, by making a combination of these two results, a consequence for different spans is got. And it is recommend 18 meters as safety thickness of interval layers for Gushan Iron Mining.