露天地下开采隔离层稳定性研究

露天地下开采隔离层稳定性分析是矿山中经常遇到的问题。以大宝山矿露天地下开采的工程实例,采用数值分析方法,对隔离层稳定性进行分析计算,发现空区顶板的拉应力是关系隔离层稳定性的关键因素。通过对隔离层的安全厚度数值计算,与5种理论计算方法结果进行了比较,综合求和归一法数据处理和多项式数值逼近得到了不同空区跨度与隔离层安全厚度关系。结果为露天地下开采隔离层稳定性分析的方法进行了验证和补充,也为矿山设计隔离层厚度提供了参考,对指导露天地下开采安全生产施工具有重要意义。

Stability of boundary pillar of open pit and underground mine

The stability of boundary pillar can be found across in open pit and underground mine shifting. In this paper, based on the conditions of Dabaoshan Mine which is a open pit and underground mine, the stabilities of boundary pillar are calculated and analysed by using the method of numerical simulation. It is found that the tensile stress of the roof of mine-out areas is the main factor of the stabilities of boundary pillar. The boundary pillar’s safety thickness is calculated by the method of numerical simulation and have compared and analysed with other results which are calculated by five representative ways. Through summing up the calculation results by summation normalization method and approximating the result by polynomial numerical approximation method, the relationship between the span of mine-out areas and the boundary pillar’s safety thickness has been established. It can be used to prove , supplement for the stability of boundary pillar of open pit and underground mine and can guide the design of the boundary pillar’s safety thickness. This will be of great significances to instruct the safety production of open pit and underground mine.