|
| Numerical simulation and analysis of bench blasting in open water-bearing hole |
| Received:September 04, 2020 Revised:September 11, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI： |
| KeyWord:strip mining; hole; blasting parameter optimization; numerical simulation; LS-DYNA |
| Author | Institution |
| WANG Hao |
昆明理工大学 公共安全与应急管理学院 |
| ZHANG Zhiyu |
昆明理工大学 国土资源与工程学院 |
| LEI Zhen |
贵州理工学院矿业工程学院 |
| LI Chaoqiang |
中铁十二局集团第二工程有限公司 |
|
| Hits: 1148 |
| Download times: 988 |
| Abstract: |
| In order to improve the unsatisfactory blasting effect of Jinning phosphate due to the accumulation of water in the hole, under the condition that the amount of single-hole explosive and the embedding depth unchanged, only the hole spacing and row spacing were changed. Using LS-DYNA, 6 sets of calculation models with hole spacing of 5m, 6m, 7m and row spacing of 3m and 4m were established and analyzed by Ls-Prepost. The results show that changing the hole spacing and row spacing of step blasting changes the superposition effect of the explosion stress wave. The hole spacing and row spacing have critical values, and the effective stress value of the selected element increases less when the critical value is lower. Considering the maximum effective stress of the unit comprehensively, it is recommended to use hole mesh parameters with a hole spacing of 600cm and a row spacing of 400cm. The hole network parameters obtained by numerical simulation were applied to the field blasting project. Statistical analysis found that the bulk rate decreased by 20.6% compared with the previous improvement, the blast pile looseness was good, the clump size was moderate, and the unit explosive consumption was reduced from the original 0.33kg·m-3 to 0.25kg·m-3 |
| Close |
|
|
|