基于π定理的崩落法转充填法过渡采场顶柱尺寸研究  

Study on top pillar size of transition stope from caving method to filling method based on π theorems

作　　者：刘艳章[1] 邓磊[1] 王其飞[1] 赵卫[1] 石志军[1] 张群[1] 张丙涛[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《采矿与安全工程学报》2015年第2期331-336,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51074115);国家科技支撑计划项目(2011BAB05B03)

摘　　要：崩落法转充填法开采过程中,充填法过渡采场顶柱下方存在采空区,顶柱上部有大量崩落法开采留下的松散岩石,顶柱的稳定性对过渡段矿石的安全开采具有重要意义。过渡采场顶柱厚度与跨度之比即厚跨比r是影响过渡采场顶柱稳定性的重要因素之一,为了分析顶柱稳定性,采用π定理建立了充填法过渡采场顶柱厚跨比r和顶柱稳定性的关系模型,该模型选取顶柱的许用应变作为采场稳定性判断标准,根据许用应变得到合理的厚跨比。将此关系模型应用于程潮铁矿无底柱分段崩落法转充填法的试验过渡采场顶柱尺寸研究中。运用有限元法计算得出程潮铁矿过渡采场顶柱的最小厚跨比rmin,根据损失率约束得出最大的厚跨比rmax。通过计算厚跨比r的取值为1.24~1.45。试验采场按此厚跨比进行生产,顶柱未失稳。工程试验检验了此关系模型的有效性。In the process of transition from caving method to filling method, there is a large scale goaf beneath the top pillar of a filling method transition stope and a large number of loose rocks upon this top pillar. So the stability of the top pillar of the transition stope has a great significance for mining safety. The thickness-to-span ratio of the top pillar is an important factor affecting the top pillar＇s stability. The relationship model of the stability and the thickness-to-span ratio of the top pillar of the filling method transition stope have been established with the π theorems to analyze the stability of top pillar. The allowable strain of top pillar has been selected as the criterion of stope stability in the model. According to the allowable strain, the reasonable thickness-to-span ratio has been obtained. This model has been applied to study the size of the top pillar in the test transition stope from sublevel caving method to filling method at Chengchao Iron Mine. The minimum thickness-to-span ratio which is suitable for the engineering condition of Chengchao Iron Mine has been obtained by the finite element method; the maximum thickness-to-span ratio has been obtained by loss rate. As the result of calculation, the thickness-to-span ratio for Chengchao iron is 1.24-1.45. The top pillar instability of the test stope does not happen in the production process. The effectiveness of the model is verified by engineering test.

关 键 词：顶柱尺寸 π定理 厚跨比 许用应变 

分 类 号：TD353[矿业工程—矿井建设]