大丽铁路三叠系松桂组页岩型隧道特征及施工对策  

The Geological Characters and Construction Countermeasures Corresponding on Tunnel through Shale(T_(3sn)) in Dali-Lijiang Railway

作　　者：杨英[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2008年第9期77-79,90,共4页Journal of Railway Engineering Society

摘　　要：研究目的:大丽铁路三叠系松桂组页岩型隧道具有特定构造环境下的工程条件,破碎页岩遇水软化膨胀等原因易引起初期支护变形,给隧道施工带来较大困难,因此,有必要研究该类围岩特性及隧道施工对策。研究结论:根据页岩(砂质页岩、炭质页岩)的结构特征,提出了相应的施工对策,如对开挖外轮廓进行调整、增大预留变形量、采用三台阶法施工、设置全环工18工字钢架、调整系统锚杆长度、加强监控量测等,这些措施较好地抑制了初期支护变形。Research purposes： There are some speeifieal engineering - geology eonditions on tunnel through shale （ T3s. ） in Dali -Lijiang railway. Due to some peculiar eharaeters of craeked with teetonies and intenerated and inflated with water for shale （ T3sn ）, a great deal of difficulties are brought on construction of tunnel. It is necessary to investigate construction countermeasures corresponding shale（T3sn）. Research conclusions ： Based on the characters of shale （ T3sn ）, a lot of construction countermeasures are adopted, including adjustment tunnel profile, accretion premeditate distortion, three -sidestep -diging into, setting steel structure, adjustment length of anchor - pole, strengthening inspection and so on. As a result of above measures, initial stage shoring distortion of tunnel is restrained effectively.

关 键 词：大丽铁路 砂质页岩 炭质页岩 隧道 施工 

分 类 号：U445[建筑科学—桥梁与隧道工程]