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Factors influencing overbreak volumes in drill-and-blast tunnel excavation. A statistical analysis applied to the case study of the Brenner Base Tunnel – BBT
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.tust.2020.103475
G.M. Foderà , A. Voza , G. Barovero , F. Tinti , D. Boldini

Abstract This paper deals with the analysis of overbreak in tunnels excavated with the drill-and-blast method. The overbreak phenomenon has many negative impacts on tunnelling organisation and economy and its precise assessment plays a fundamental role in the process of construction optimisation. The study proposes an operative methodology to estimate overbreak volumes and to distinguish so-called technical overbreak, mainly related to drill-and-blast design and execution, from geological overbreak, typically influenced by rock-mass characteristics. The approach was developed and implemented during the excavation of the Brenner Base Tunnel (BBT) and was based on the interpretation of tunnel laser scanning surveys and high-resolution images of the excavated surfaces. The analysis of more than 1,800 m of excavation from three different tunnels of the BBT system allowed to identify the main factors influencing the technical and the geological overbreak. An empirical model for overbreak prediction, based on the Rock Mass Rating index and the length of blast holes, is subsequently presented and validated in the last part of the paper.

中文翻译:

钻爆隧道开挖超挖体积的影响因素[J]. 应用于 Brenner Base Tunnel 案例研究的统计分析 – BBT

摘要 本文研究了钻爆法开挖隧道的超挖分析。超挖现象对隧道掘进组织和经济性有诸多负面影响,其精确评估在施工优化过程中起着基础性作用。该研究提出了一种估算超挖量并区分所谓的技术超挖(主要与钻爆设计和执行有关)与通常受岩体特征影响的地质超挖的操作方法。该方法是在 Brenner Base Tunnel (BBT) 开挖过程中开发和实施的,基于对隧道激光扫描调查和开挖表面高分辨率图像的解释。分析超过1,从 BBT 系统的三个不同隧道开挖 800 m,可以确定影响技术和地质超挖的主要因素。随后在论文的最后部分提出并验证了基于岩体评级指数和爆破孔长度的超挖预测经验模型。
更新日期:2020-11-01
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