一、隧道开挖作业中超欠挖的不可避免性大家都知道,隧道施工中超挖和欠挖是经常议论的难题。因为它是关系到工程进度、工程质量和经济效益的大事;如果开挖超挖了一立方米,就得用同等数量的砼或浆砌片石去回填密实,如果欠挖了,就要用大量的时间和人作“剥皮”处理,所以超挖和欠挖都是同等令人头痛的事情。若按平均线性超挖为18厘米(即四臂台车开挖的允许超挖值)计算,则每米成洞造价就要增加近千 First, the inevitable tunnel digging over the inevitable we all know, over-excavation and under-digging tunnel construction is often discussed the problem. Because it is related to the progress of the project, the quality of the project and economic benefits of the event; if digging over a cubic meter of excavation, you have to use the same amount of concrete or mortar rubble to backfill dense, if less dug, we must use a large amount Of the time and people doing “peeled” treatment, so over-excavation and under-excavation are all equally troubling things. If the average linear over-excavation of 18 cm (that is, four-arm trolley excavation allows the value of over-excavation), the cost per meter hole will increase by nearly a thousand