超挖是指以设计开挖轮廓线为基准，实际开挖的断面在基准线以外的部分。
n. overbreak ; backbreak ; overexcavation
These will be very useful in the assessment of the overbreak in underground workings and of the stability of workings in construction as well as their reinforcement.
这对于地下洞室超挖的评价方法以及工程建设中地下洞室稳定性评价以及加固处理具有一定指导意义。
参考来源 - 某抽水蓄能电站PD6平洞超挖调查与评价 ENGLISH·2,447,543篇论文数据，部分数据来源于NoteExpress
分析了超挖的因素，提出了防止或减少超挖的措施。
Analysed the factors of overbreaking, offered some preventative and reducing overbeaking measures.
介绍一软土地区深基坑由于超挖引起基坑险情的工程实例。
An engineering example that a deep foundation pit is in dangerous status caused by over excavation in soft clay is described.
地质塌方、转弯段的技术性超挖按实计量并折算成隧道延米计价。
Geological landslides and technical over-break in turning part shall be measured again and converted to total length of the tunnel.
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