胶结充填体下顶底柱进路开采参数优选

为了实现顶底柱安全回采, 提高矿石利用率, 利用三维有限元方法对不同参数下的胶结充填体下顶底柱进路开采进行了优选。分析了巷道开挖高度1.8 m、顶板充填体厚度为2.0 m和2.5 m两种情况下, 巷道宽度从1.8 m到3.0 m各个结构参数的力学特点, 利用最大主应力准则和塑性区贯通准则分别判断了巷道的合理宽度。结果显示, 应用最大主应力准则时, 顶板充填体厚度为2.0 m和2.5 m对应的合理的巷道宽度分别为2.2 m和2.2 m, 应用塑性区贯通准则时, 合理的巷道宽度分别为2.2 m和2.4 m。另外, 对有限元的结果进行拟合得到了最大沉降与巷道宽度的二次函数关系, 以及合理宽度、充填体抗拉强度和安全系数之间的关系, 可直接指导实际设计与施工。

Parameter Optimization for Pillars Robbing under Cemented Filling Body

In order to draw pillars safely and increase ore utilization, parameters of pillar robbing under cemented filling body was optimized via 3D-FEM. Based on the analysis of mechanical properties of underground roadway excavated 1.8 m high and ranging from 1.8 m to 3.0 m wide, with roof filling body 2.0 m and 2.5 m in thickness respectively, proper width for such roadway was respectively determined by using maximum principal stress theory and plastic zone connection criterion. Analysis results with the first theory showed that it is advisable for roadways with roof filling body 2.0 m and 2.5 m thick to be the same of 2.2 m wide. While the analysis with plastic zones connection criterion led to the advisable widths of 2.2 m and 2.4 m, respectively. Furthermore, the fitting of finite element method resulted in a quadratic function of the maximum subsidence and roadway width, as well as the relation among the advisable width, tensile strength of filling body and safety coefficient, which have great practical values for future design and construction.