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超欠挖一直是隧道开挖中遇到的一大难题。该文在金丽温高速红枫连拱隧道超欠挖现象现场调查的基础上,绘制出开挖断面超欠挖块体投影面的平面展示图,对超欠挖现象的各种几何形态进行统计分析,包括投影面的边分析、面分析和块体的空间分布、超欠挖深度、体积分析。统计连拱隧道超欠挖块体空间几何和体积等分布特征,得出开挖断面上不同弧段的超欠挖差异,最后估算由于超欠挖而造成的对隧道成本的影响以及不同弧段超挖造成增加投入的差异。
Over-under-excavation has always been a major problem encountered in tunnel excavation. Based on the investigation of the overbreak and underbreak phenomenon of the Hongfeng high-speed Hongfeng multi-arch tunnel, this paper draws a plane map of the over-under-excavation block’s projection plane and analyzes the various geometric shapes of the over-under-digging phenomenon , Including the edge of the projection surface analysis, surface analysis and the spatial distribution of blocks, over-under-dig depth, volume analysis. Statistics of arch tunnel over-under-excavation geometry and volume distribution characteristics of the block, resulting in excavation cross-section of different arc overbreak difference, and finally estimate due to over-excavation caused by the impact on the tunnel cost and different arcs Overdrafts result in increased investment differences.