arch crown

基本解释

The blasting vibration rules of arch crown and upper and side surrounding rocks behind tunnel face are studied.
研究隧道掌子面后方隧道拱顶、掌子面正上方和侧面围岩的爆破振动规律。
The test results show that the failure of surrounding rock initiates from arch crown of tunnel and develops upward progressively.
试验结果表明：隧道围岩的破坏从拱顶开始，并逐渐向上发展；
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According to the monitoring data of the arch crown subsidence, the thesis analysis the effect rule of the arch crown subsidence because of excavation.
本文以拱顶下沉的监测数据为依据，分析了群洞开挖对拱顶下沉的影响规律，通过对群洞施工时的洞室之间的相互影响情况，提出一些有指导性的意见。