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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。
Isolation layer is the key to ensure safe underground mining from open-air. In order to determine the thickness of safety isolation layer in Gushan Iron Mine, numerical simulation is carried out by ANSYS finite element analysis software. Firstly, the numerical simulation of the regular gob area with the same span (27.5m) of different thickness of quarry pillar and height of goaf is conducted. The height of controlled roof of goaf is 16m. Numerical simulations of the thickness of pillars with different span and different isolation have been made to obtain the thickness of the safety barrier under different span. Five kinds of representative theoretical calculation methods were selected to calculate the safety thickness of the insulation layer. The results are in agreement with the numerical simulation results. Finally, combined with the theoretical calculation results, given the span of safety isolation layer thickness. Taking the Gushan Iron Mine as an example, it is recommended that the thickness of the isolation layer be converted from open-pit to underground mining is 18m.