摘要
小净距重叠隧道合理开挖时序对确保施工安全性具有十分重要意义。本文结合施工支护具有滞后性的特点,重点从围岩破坏模式角度出发,研究了爆破动载作用下中厚水平层状岩小净距重叠隧道合理开挖时序问题,通过对围岩岩块脱落、岩层面开裂、岩层面滑移等特征比较分析,给出了先下后上开挖时序较优的研究结论。成果对类似工程具有一定程度的参考和借鉴意义。
The reasonable excavation sequence of overlapping tunnels with small spacing is of great significance to ensure the safety of the construction.In this paper,combined with the construction team and support with hysteresis characteristics,focus on the failure mode of surrounding rock angle of the blasting dynamic load under the action of thick layered rock small spacing overlapped tunnel reasonable excavation sequence,through the comparison and analysis of the characteristics of rock block falling off,cracking of the rock surface,rock level slip,gives the first after excavation is sequential,and the conclusion of the study.The results have a certain degree of reference and reference for similar projects.
引文
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