充填体矿柱刚度对采动地压分布影响分析

为研究充填体变形特性对采动压力分布的影响规律,采用弹性地基梁理论和结构力学理论,构建了充填体矿柱采动地压分布力学模型,给出了充填体变形参数影响下的矿柱压力理论解析解,分析了不同刚度比对采动地压分布影响规律,并提出了基于充填体与围岩变形参数匹配的充填体力学设计方法。研究结果表明：充填体与围岩变形参数对充填采场采动压力分布影响显著；岩体与充填体弹模比小于1000时,围岩及充填体采动压力对弹模比的参数敏感度较高；在充填体参数设计时,应将岩体与充填体弹模比控制在1500以内,为类似充填开采矿山的充填体力学设计提供了有益参考。

Influence Analysis of Backfill Pillar Stiffness on Mining Pressure Distribution

In order to study the influence of backfill deformation characteristics on mining pressure distribution, the elastic foundation beam theory and structural mechanics theory were used. The mechanical model of mining ground pressure distribution of backfill pillar was constructed. The theoretical analytical solution of pillar pressure under the influence of backfill deformation parameters was given. The influence law of different stiffness ratio on mining ground pressure distribution was analyzed. A mechanical design method of backfill based on matching deformation parameters of backfill body and surrounding rock was proposed. The results show that the deformation parameters of backfill and surrounding rock have a significant effect on the distribution of mining pressure. When the elastic modulus ratio between rock mass and filling body is less than 1000, the mining pressure of surrounding rock and filling body is highly sensitive to the parameters of elastic modulus ratio. In the parameter design of backfill, the elastic modulus ratio between rock mass and filling body should be controlled within 1500, which provides a useful reference for the mechanical design of backfill mining.