自然崩落法矿岩可崩性模糊物元评价方法

FUZZY MATTER-ELEMENT EVALUATION OF ORE-ROCK CAVABILITY IN BLOCK CAVING METHOD

为更加合理地评价自然崩落法矿岩的可崩性,把模糊数学和物元分析有机地结合在一起,将矿岩可崩性分为无可崩性、可崩性差、可崩性较好、可崩性好、可崩性很好5个等级作为物元,选用矿岩质量指标RQD值、单轴饱和抗压强度、节理间距、初次拉底水力半径、水理特性值作为评价指标,通过隶属度计算、关联度变换及从优隶属度处理,建立矿岩可崩性评价的关联系数模糊物元。采用求和归一法确定评价指标权重,运用关联度计算及最大关联度原则,对矿岩可崩性进行隶属度评价,计算矿岩各指标量相对于不同评价级别的隶属度,建立矿岩可崩性的复合模糊物元分析模型,并利用该方法对九顶山铜钼矿的矿岩体可崩性进行分级。结果表明:蚀变角岩可崩性较好,蚀变花岗斑岩可崩性很好,致密花岗斑岩的可崩性差;与单因素指标评价相对比,解决单因素指标对矿岩可崩性评价不相容的问题,评价结果与放矿口块度监测结果相吻合。

In order to evaluate the cavability of ore-rocks in block caving method, fuzzy mathematics and matter element analysis method were combined together. The cavability of ore-rocks was divided into five grades including none, poor, fair, good and perfect as the types of matters elements. The RQD, the saturated uniaxial compressive strength, the distance of joint, the hydraulic radius of first cut and the hydraulic feature values were taken as the indices of evaluation. Based on the principle of membership degree in fuzzy evaluation analysis, the membership degree of ore-rock index relative to different evaluation categories were calculated. A model of cavability of ore-rocks in terms of complex fuzzy matter element analysis was established; and a method of cavabiltiy description was presented. The cavability of ore-rocks in a copper-molybdenum mine at the Jiuding mountain was evaluated with the proposed method. The results indicate that： the cavability of altered hornfels is fair; the cavability of altered granite porphyry is good; and the cavability of dense granite porphyry is poor. The results of the evaluation agree well with results of ore lumpiness monitoring and avoided the problem of incompatibility of the evaluation with a single factor index.