大丽铁路的地质特征和隧道工程

研究目的:大丽铁路地形地质条件十分复杂,地处高地震区,地质灾害众多,通过本线施工揭示总结,为滇藏线延伸积累经验。研究方法:通过对大丽铁路沿线地层、地质构造、不良地质和特殊岩土等地质特征及生态环境的分析,介绍不同地质条件应采取的工程措施。研究结果:针对本线岩溶、滑坡、错落、泥石流、顺层、软土、膨胀土等地质特征,提出了比较有效的路基、桥梁、隧道工程的处理对策。研究结论:路基采用注浆加固、抗滑桩、碎石桩、搅拌桩等方法,桥梁采用桩基、换填、加强基础刚度的方法,隧道采用大小管棚超前支护及钢架、系统锚杆支护的方法,形成完整的支护体系;施工开挖验证措施合理可行。

Geological Characteristics and Tunnel Engineering in Dali-Lijiang Railway

Research purposes: Geological condition is very complex in Dali-Lijiang railway including geological(disaster),strong earthquake.By studying methods or measures of engineering constructing and processing in(Dali-Lijiang) railway,many experiences are accumulated to construct extending Yunnan-Tibet railway in future.Research methods:In the paper,it is introduced that the engineering geological characteristics about stratum,(geological) structure,unfavorable geological condition,special soil and rock and entironment in Dali-Lijiang railway.Based on different geological condition,this paper also briefly puts forward the corresponding methods or measures of(engineering) constructing and processing. Research results: According to the geological characteristics of karst,landslide,dislocation,debris flow,bedding,soft soil and swelling soil,etc.the effective treatment measures has been put forward correspondingly for subgrade,bridge and tunnel works.Research conclusions:Such consolidation methods as grouting consolidation,anti-slide pile,crushed stone pile and mixing pile are adopted for subgrade;such methods as pile foundation,replacement and strengthening of foundation rigidity are adopted for bridge;such support methods as big and small pipe roof advance support,steel frame and systematic rockbolt support are adopted for tunnel.These support measures form a complete set of support system,and these measures are proved reasonable and feasible in the construction excavation.