爆破器材2024，Vol.53Issue(6)：50-57,64,9.DOI:10.3969/j.issn.1001-8352.2024.06.008
避免山岭隧道爆破超挖与欠挖的优化方法及应用
Optimization Methods and Application for Over Excavation and Under Excavation Control in Mountain Tunnel Blasting
摘要
Abstract
In response to the problems of over excavation and under excavation during the construction of Xugaoling Tunnel on Xiangyang-Jingmen high-speed railway,3D numerical simulation technology was used to explore the impact of the minimum resistance line,auxiliary hole,and perimeter hole spacing on the quality of blasting construction in the blas-ting plan.Based on the optimization analysis of the original blasting parameters,the optimized blasting parameters were de-termined by minimizing the average linear over excavation and under excavation.Subsequently,a comprehensive evaluation of the construction quality using optimized blasting parameters was conducted through 3D laser scanning technology.The re-sults indicate that when the minimum resistance line increases from 60 cm to 75 cm,the amount of over excavation decrea-ses by about 63.6％.When the perimeter hole spacing increases from 40 cm to 55 cm,the amount of over excavation de-creases by about 77.8％.When the auxiliary hole spacing increases from 90 cm to 105 cm,the amount of over excavation only decreases by 20.0％.Using optimized blasting parameters for construction,the average linear over excavation and un-der excavation obtained from 3D laser scanning are controlled within 8 cm and 4 cm,respectively.The excavation and de-sign contour lines match well,achieving effective control of the quality of blasting construction.The optimized on-site blas-ting construction quality is excellent,avoiding the problem of large-scale over excavation and under excavation.关键词
铁路隧道/爆破/超挖与欠挖/最小抵抗线/辅助眼/周边眼Key words
railway tunnel/blasting/over excavation and under excavation/minimum resistance line/auxiliary hole/perimeter hole分类
交通运输引用本文复制引用
汪家甫..避免山岭隧道爆破超挖与欠挖的优化方法及应用[J].爆破器材,2024,53(6):50-57,64,9.基金项目
中铁十五局集团有限公司科技研发项目(2023C7) （2023C7）
