长九神山灰岩矿开采爆破块度预测研究  

Study on Prediction of Blasting Fragmentation in Changjiu Shenshan Limestone Mine

作　　者：朱子晗 尹岳降 陈明[1] 魏东[1] 卢文波[1] 刘建程 ZHU Zi-han;YIN Yue-jiang;CHEN Ming;WEI Dong;LU Wen-bo;LIU Jian-cheng(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Sino-hydro Eighth Bureau Co.,Ltd.,Changsha 410004,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]中国水利水电第八工程局有限公司,长沙410004

出　　处：《爆破》2021年第2期17-23,31,共8页Blasting

基　　金：国家自然科学基金面上项目(51979205,51779190);中国博士后科学基金面上资助项目(2020M672311);中国博士后科学基金特别资助项目(2020T130569)。

摘　　要：长九神山灰岩矿是世界上生产规模最大的砂石骨料场,爆破块度直接影响矿山的生产效益。结合现场实际生产,在两个岩体节理发育的采区共进行了11次爆破试验。基于Kuz-Ram爆破块度预测模型计算了爆破后的平均块度,发现平均块度预测计算值与爆破后实测值差异巨大。进而研究了计算值与实际值差距较大的原因,结果表明:岩体结构中节理发育程度、岩石性质是影响块度分布的主要因素,修正的Kuz-Ram模型岩石系数A的计算严重影响预测结果,建议在计算岩石系数A时,不考虑岩石密度的影响。通过现场4次验证性爆破试验数据分析显示,基于Kuz-Ram模型并使用建议修正方法得到的岩石系数,计算得到的平均块度预测值准确性明显提升,相对误差均在10%以下,预测准确性大幅提高。Changjiu Shenshan limestone mine is the largest sand aggregate field in the world.The blasting fragmentation directly affects production efficiency of the mine.Combined with production practice,11 blast tests were carried out in two mining areas where rock joints are developed.Based on Kuz-Ram blasting fragmentation prediction model,the average fragmentation after blasts was calculated.It is found that there is a great difference between the predicted value and the measured value.The results show that joint development degree and rock properties are the main factors affecting fragmentation distribution.The calculation of rock coefficient A in the modified Kuz-Ram model seriously affects the prediction results.It is suggested that the influence of rock density should not be considered in the calculating of the rock coefficient A.Through the analysis of data from four field verification blasting tests,it shows that the accuracy of the average fragmentation prediction value is significantly improved based on the Kuz-Ram model and the rock coefficient obtained by the proposed correction method.The relative errors are all below 10%,and the prediction accuracy is greatly improved.The research results can provide a technical support for the adjustment of blasting parameters in mining.

关 键 词：爆破块度 Kuz-Ram模型 块度预测 平均块度 岩石系数 

分 类 号：TD235[矿业工程—矿井建设]