摘要
预加固技术在隧道穿越不良地段时具有明显的支护效果及显著的经济效益，本文对各种预加固技术，如小导管，管棚，锚杆，水平旋喷注浆成拱，人工冻结，预切槽法进行了阐述与总结，并分析当前预支护的研究现状，提出相关建议及思考，供类似隧道施工参考。
Pre-support in the tunnel which through the bad lot, have a significant support effect and the significant economic benefits. This article describe and reviewed a variety of Pre-support technology and analyzed the current status of nursing research,put forward some suggestion and thought for similar tunnel reference.
关键词
隧道工程
不良地段
预加固技术
tunnelling engineering
bad lot
pre-support technology
