断层防水矿柱合理留设数值模拟分析与评价

Numerical Simulation and Assessment for Waterproof Pillar Design

根据某磁铁矿床Ⅰ~#矿体的水文地质特征和采矿方法,基于流-固耦合原理,利用Phase2软件建立了数值模型,分析研究了防水矿柱厚度对局部地下水渗流场的影响以及断层、围岩变形和破坏特征,并结合经验公式法得出了Ⅰ~#矿体合理的断层防水矿柱厚度。结果表明,对于Ⅰ~#矿体数值模拟建议留设的防水矿柱厚度为15~20 m,经验公式计算的防水矿柱留设厚度为16.59 m,综合考虑,Ⅰ~#矿体在目前地下水位条件下的断层防水矿柱厚度为17 m。

According to hydrogeological properties of Ⅰ^# orebody and mining method for it,a numerical model was established by using software Phase2 based on the basic theory of fluid-solid coupling. The influence of waterproof pillar thickness on local groundwater seepage,as well as fault,surrounding rock deformation and damage characteristics,was analyzed. A reasonable thickness for waterproof pillar was finally determined for Ⅰ^# orebody based on an empirical formula. Results show that a waterproof pillar shall be with thickness of 15 ~ 20 m for Ⅰ^#orebody according to the numerical simulation,while the empirical formula calculation led to the thickness at 16.59 m. As a result,the waterproof pillar for Ⅰ^#orebody at the existing underground water level is designed to be with a thickness of 17 m based on a comprehensive consideration.