论黄土隧道进洞关键技术

摘要

黄土隧道进洞困难，经常发生仰坡开裂、导向墙下沉等问题。黄土隧道进洞前必须认真调查地形、地貌、陷穴、冲沟等，据此评价仰坡和周围山体的稳定性；进洞前要充分加固洞口两翼山坡的坡脚；进洞施工时要合理选择施工工法和支护措施，同时设置合理的预留沉降量。%A series of problems such as slope cracking and guide wall sinking often occurred during loess tunnel excava-tion.Before the excavation,we should make a serious investigation on topography,landforms,cratering,gully and so on. Therefore,we could evaluate the stability between the slope and its surrounding massifs,fully reinforced the hillside slope toes of the tunnel entrance before tunneling,and reasonably selected the construction methods and the supporting measures as well as set up reasonable reserved settlement during the excavation.