中南大学学报（自然科学版）2017，Vol.48Issue(12)：3309-3315,7.DOI:10.11817/j.issn.1672-7207.2017.12.023
单楔形掏槽爆破腔体时空演化及应用
Temporal-spatial evolution and application of blasting cavity of single wedge cutting
摘要
Abstract
In order to change the present situation of narrow cutting cavity, the model of single wedge cutting blasting was established by combining AUTO CAD with ANSYS. The explicit dynamic software LS-DYNA was used to simulate cavity extension. From the aspects of temporal and spatial evolution with multi-direction cutaway views, the applicability of vertical single wedge cutting blasting for TONGKENG mine haulage roadway excavation was researched. The results show that joint modeling with AUTO CAD and ANSYS can overcome the shortcomings of ANSYS for complex model modeling, and achieve refined digital modeling for roadway. Cavity extension is more intuitive when elements failure is defined, which contributes to the analysis of cutting effect. The bidirectional primary and secondary trumpet-shaped cavity is formed with the outlines of triangle in horizontal and longitudinal sections. Meanwhile, there is different outlines in different vertical sections. The superposition of blasting stress waves has remarkable effect on the shape of cavity that is close to the hole bottom, and the shape of cavity near excavating face is influenced by the layout of blast holes markedly. For improving the blasting effect, the layout of auxiliary holes can be adjusted to sloping appropriately. The volume of this cavity is larger than that of the cylinder cutting. Therefore, the vertical single wedge cutting blasting is capable of improving the cutting present situation. Its footage keeps 2 m and efficiency ratio is 91％. Furthermore, the time lag between the denotations of auxiliary holes and cutting holes should be kept in the scope of milliseconds.关键词
掏槽爆破/巷道掘进/时空演化/联合建模/数值模拟Key words
cutting blasting/roadway excavation/temporal and spatial evolution/joint modeling/numerical simulation分类
矿业与冶金引用本文复制引用
胡建华,杨春,周科平,周炳任,张绍国..单楔形掏槽爆破腔体时空演化及应用[J].中南大学学报（自然科学版）,2017,48(12):3309-3315,7.基金项目
国家"十二五"科技支撑计划项目(2015BAB12B01) （2015BAB12B01）
国家重点研发计划(2017YFC0602901) （2017YFC0602901）
国家自然科学基金资助项目(41672298)(Project(2015BAB12B01) supported by National Science and Technology Pillar Program during the "Twelfth Five-Year" Period （41672298）
Project (2017YFC0602901) supported by the National Key Research and Development Program of China （2017YFC0602901）
Project(41672298) supported by the National Natural Science Foundation of China) （41672298）
