露天转地下开采境界顶柱安全厚度研究

摘要

Boundary pillar is an guarantee for ensuring the safety of underground mining and open pit and the stability of open pit slope,and the reasonable thickness of boundary pillar is essential to realize the transition from open pit to under-ground. To determine the safety thickness of boundary pillar in Xinqiao mine,such measure as ratio of span and thickness e-quation,load transfer method and structural mechanics method, are adopted to calculate and analyze the safety thickness of boundary pillar. Numerical simulation on different spans and different boundary pillar thickness is carried out by ANSYS. By analyzing the theoretical calculations and numerical simulation results,the safety depth of boundary pillar under different goaf span is obtained. The results can effectively determine the thickness of boundary pillar of mine design,and have important im-plications for guiding safety production in transition from open pit to underground mining. Based on the actual mining span (30 m) in the mine,the safety thickness of boundary pillar in Xinqiao mine is recommended as 24 m.%境界顶柱是露天开采和地下开采有序进行的保证,其合理的厚度对露天转地下具有重要意义. 为确定新桥矿露天转地下境界顶柱安全厚度,运用厚跨比法、荷载传递线交汇法和结构力学方法对境界顶柱安全厚度进行理论分析与计算,并用ANSYS对不同跨度和不同境界顶柱厚度进行数值模拟. 通过对理论计算和数值模拟结果的分析,得到了不同采空区跨度下的境界顶柱安全厚度. 根据分析结果可以有效地确定矿山的境界顶柱厚度,为露天转地下安全生产提供可靠的指导. 根据矿山30 m的实际开采跨度,推荐新桥矿的境界顶柱安全厚度为24 m.