地下采空区矿柱稳定性分析

针对某地下采空区矿柱稳定性问题，在现场工程地质调查的基础上，按照ＮＣｉ岩体质量分类法对该矿区岩体质量进行了分类，并由此对其岩体强度作出了估算。运用点安全系数法和可靠度分析法分别计算了矿柱的点安全系数和可靠指标，结果表明采空区矿柱处于稳定状态，所得结论与工程实际比较吻合。

Stability Analysis of Pillars in Minedout Area

On the basis of field investigation of engineering geology, rock mass classification is made for a large phosphate mine according to NGI classification method and its rockmass strength is estimated. According to stress measurements of typical pilliars of its minedout area, their point safety coefficients and reliability are calculated using point safety coefficient method and reliability analysis method, respectively. The results show that all pilliars of the minedout area are in stable state. Since their measured results are in accordance with their actual engineering results, the measured results can be used as the basis for mining plan of deep orebody.