高阶段采场充填体强度影响因素敏感性分析

Sensitivity analysis of factors influencing the strength of filling body in high stage stope

高阶段矿房回采过程中,如何既能减少胶结剂用量又能保证高阶段充填体的稳定性,是采用阶段空场嗣后充填法开采的矿山面临的难题之一。为合理划分采场结构,降低充填成本,针对罗河铁矿高阶段采场充填体稳定性开展研究,研究了各因素交互作用下对充填体强度影响的敏感程度,提出采场宽度、高度、长度与充填体强度之间的合理匹配值。利用BOX-BEHNKEN设计法开展试验,根据设计原理进行4因素3水平设计,计算各种参数情况下,矿山安全生产所需要的胶结充填的抗压强度,再采用Design-expert软件拟合充填体强度需求影响因素与响应量,对响应面回归模型进行方差分析,确定各因素的敏感程度。研究结果表征了充填体强度需求影响因素敏感度顺序为:采场宽度>采场长度>采场高度>内摩擦角,提出了各工艺技术条件下充填体强度需求,对矿山实际生产具有一定指导意义。

During the process of high-stage room mining,how to reduce the amount of cement and ensure the stability of high-stage filling body is one of the problems faced by many mines that adopt the method of open stope and subsequent filling.In order to reasonably divide the stope structure and reduce the filling cost,this paper studied the stability of the filling body in the high stage stope of Luohe iron mine,investigated the sensitivity of the interaction of various factors on the strength of the filling body,and proposed the reasonable matching value between the stope width,height,length and the strength of the filling body.The Box-Behnken design method was used to carry out the experiment.According to the design principle,the four factors and three levels design were carried out.The compressive strength of cemented filling required by the safe production of the mine was calculated under various parameters.Then,the design expert software was used to fit the influencing factors and response quantity of the strength demand of the filling body.The variance analysis was carried out on the response surface regression model to determine the sensitivity of each factor.The results showed that the sensitivity order of factors affecting the strength demand of filling body was as follows:stope width>stope length>stope height>internal friction angle.The strength demand of filling body under various technological conditions was proposed,which can provide certain guiding significance for the actual production of mines.