The optimal selection of schemes of water transportation projects is a process of choosing a relatively optimal scheme from a number of schemes of water transportation programming and management projects, which is of ...The optimal selection of schemes of water transportation projects is a process of choosing a relatively optimal scheme from a number of schemes of water transportation programming and management projects, which is of importance in both theory and practice in water resource systems engineering. In order to achieve consistency and eliminate the dimensions of fuzzy qualitative and fuzzy quantitative evaluation indexes, to determine the weights of the indexes objectively, and to increase the differences among the comprehensive evaluation index values of water transportation project schemes, a projection pursuit method, named FPRM-PP for short, was developed in this work for selecting the optimal water transportation project scheme based on the fuzzy preference relation matrix. The research results show that FPRM-PP is intuitive and practical, the correction range of the fuzzy rained is both stable and accurate; preference relation matrix A it produces is relatively small, and the result obtherefore FPRM-PP can be widely used in the optimal selection of different multi-factor decision-making schemes.展开更多
为减少回采过程中残留顶底柱资源浪费,以赤峰柴胡栏子金矿为研究对象,基于LS-DYNA有限元软件,建立挤压爆破崩落放矿回采底柱数值模型,根据0.7、0.8、1.0 m 3种最小抵抗线和0.8、0.9、1.0 m 3种孔距设计9种方案,通过分析炮孔爆破过程中...为减少回采过程中残留顶底柱资源浪费,以赤峰柴胡栏子金矿为研究对象,基于LS-DYNA有限元软件,建立挤压爆破崩落放矿回采底柱数值模型,根据0.7、0.8、1.0 m 3种最小抵抗线和0.8、0.9、1.0 m 3种孔距设计9种方案,通过分析炮孔爆破过程中爆炸裂纹扩展与压力演化、有效应力和有效塑性应变时程曲线以及矿石的损伤情况,获取各方案的评判指标。采用模糊层次分析法构建目标相对优属度矩阵和模糊判断矩阵,通过综合评判选出最佳的爆破方案。结果表明:最小抵抗线取0.7 m、孔间距取0.9 m为挤压爆破崩落放矿回采底柱的最佳爆破参数。现场试验结果表明,使用优化后的爆破参数获得的爆破效果更好。展开更多
基金The authors would like to acknowledge the funding support of the National Natural Science Foundation of China （Nos. 50579009, 70425001 ） the National 10th Five Year Scientific Project of China for Tackling the Key Problems （2004BA608B-02-02）the Excellence Youth Teacher Sustentation Fund Program of the Ministry of Education of China （Department of Education and Personnel [ 2002 ] 350）.
文摘The optimal selection of schemes of water transportation projects is a process of choosing a relatively optimal scheme from a number of schemes of water transportation programming and management projects, which is of importance in both theory and practice in water resource systems engineering. In order to achieve consistency and eliminate the dimensions of fuzzy qualitative and fuzzy quantitative evaluation indexes, to determine the weights of the indexes objectively, and to increase the differences among the comprehensive evaluation index values of water transportation project schemes, a projection pursuit method, named FPRM-PP for short, was developed in this work for selecting the optimal water transportation project scheme based on the fuzzy preference relation matrix. The research results show that FPRM-PP is intuitive and practical, the correction range of the fuzzy rained is both stable and accurate; preference relation matrix A it produces is relatively small, and the result obtherefore FPRM-PP can be widely used in the optimal selection of different multi-factor decision-making schemes.
文摘为减少回采过程中残留顶底柱资源浪费,以赤峰柴胡栏子金矿为研究对象,基于LS-DYNA有限元软件,建立挤压爆破崩落放矿回采底柱数值模型,根据0.7、0.8、1.0 m 3种最小抵抗线和0.8、0.9、1.0 m 3种孔距设计9种方案,通过分析炮孔爆破过程中爆炸裂纹扩展与压力演化、有效应力和有效塑性应变时程曲线以及矿石的损伤情况,获取各方案的评判指标。采用模糊层次分析法构建目标相对优属度矩阵和模糊判断矩阵,通过综合评判选出最佳的爆破方案。结果表明:最小抵抗线取0.7 m、孔间距取0.9 m为挤压爆破崩落放矿回采底柱的最佳爆破参数。现场试验结果表明,使用优化后的爆破参数获得的爆破效果更好。
