目录一、前言....................................................................................................................................1二、工法特点............................................................................................................................3三、适用范围............................................................................................................................3四、工法原理及关键技术........................................................................................................3五、工艺流程及操作要点........................................................................................................4（一）工艺流程.................................................................................................................41、三导洞施工法（见图2）.......................................................................................42、中导洞＋分部开挖法（见图3）...........................................................................53、施工工艺流程（见图4）.......................................................................................5（二）操作要点.................................................................................................................61、洞口工程施工准备.................................................................................................62、长管棚施工.............................................................................................................63、反压回填土及地表导管注浆.................................................................................74、中导洞开挖.............................................................................................................85、侧导洞开挖.............................................................................................................86、中隔墙施工（参见图6）.......................................................................................87、正洞施工.................................................................................................................98、支护体系施工.........................................................................................................99、防排水体系...........................................................................................................1010、二次衬砌施工.....................................................................................................1011、监控量测..............................................................................................................11六、机具设备..........................................................................................................................13七、劳动力组织......................................................................................................................13八、质量控制..........................................................................................................................14九、安全措施..........................................................................................................................14十、效益分析..........................................................................................................................14十一、工程实例................................................................
