arch crown

基本解釋

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頂、掌子面正上方和側面圍巖的爆破振動規(guī)律。
The test results show that the failure of surrounding rock initiates from arch crown of tunnel and develops upward progressively.
試驗結果表明：隧道圍巖的破壞從拱頂開始，并逐漸向上發(fā)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.
本文以拱頂下沉的監(jiān)測數(shù)據(jù)為依據(jù)，分析了群洞開挖對拱頂下沉的影響規(guī)律，通過對群洞施工時的洞室之間的相互影響情況，提出一些有指導性的意見。