新建拉林铁路主要工程地质问题探讨  

Exploration on the Engineering Geological Problems of the New Lhasa—Linzhi Railway

作　　者：邹陈[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》2016年第4期26-30,共5页Journal of Railway Engineering Society

摘　　要：研究目的:拉林铁路地处青藏高原,地质环境极其复杂,特殊岩土与不良地质极其发育,对线路方案起控制作用。本文通过对主要工程地质问题进行分析,提出其针对性选线原则,以进一步稳定和优化线路方案。研究结论:(1)拉林铁路位于雅鲁藏布江缝合带中,构造发育;(2)典型特殊岩土为:软土、膨胀岩(土)、冻土等;(3)典型不良地质现象为:地震、高地应力、风沙、冰害、高地温等;(4)选线经验及原则:应沿抗震有利地段布线,宜选择河谷背风岸行进,迎风岸路堤应远离坡脚,并采取防沙固沙工程,水库塌岸地区应行走于受构造影响较小的一岸,应避开软硬夹层且层理倾向水库一侧的岸坡,宜选在覆盖层较薄的稳定山坡一侧,避免水库蓄水后往往诱发旧滑坡复活、新滑坡产生,冰害地区宜选择在阳坡一面通过,不宜在地下水发育段挖方,跨过溪沟时宜选择在坡度较陡、水流畅通的地段,线路应尽量绕避地热发育地段,无法绕避时,应选择地热边缘地带、构造简单、地热强度弱的地段,与地热分布带呈大角度相交通过;(5)该研究成果可用于类似工程的地质选线及工程设计中。Research purposes： The new Lhasa -Linzhi Railway is located in the Qinghai -Tibet Plateau, where geological environment is extremely complex. The developed special soil and rock and unfavorable geological condition are the key to the railway alignment. Through the analysis of engineering geological problems, this paper proposed targeted alignment principle ,to further stabilize and optimize the alignment programs. Research conclusions： （ 1 ） The new Lhasa - Linzhi Railway is located in the Yarlung Zangho River suture zone, with highly developed geological structure. （2）Typical special soil and rock：soft soil, expansive soil and rock, frozen soil and so on. （3） Typical unfavorable geological condition ： earthquake, high crustal stress, sandwind, ice damage, high ground temperature and so on. （4）Several suggestion to avoid the problems：it should he along the seismic favorable section;it is better to be along leeward slope valley, windward embankment should be far away from the toe, meanwhile taking some sand engineering;in reservoir bank collapse zone, it should be along the less influenced slope by structure, should he along the stratification inclined reservoir slope at the same time avoiding soft and hard intercalary strata, and better to he along stable slope with thinner cover to prevent old landslide lose stability again or new landslide produced after water storage ;in ice damage zone,it is better to be along sunny and steep slope that water flowed unobstructed when crossing a ditch, not excavated in the abundant underground water section;it should try to avoid the geothermal development zone, or be along geothermal edge, simple structure,weak geothermal zone with a large angle if it have to. （5） The research results can be used in the similar geological engineering survey and design.

关 键 词：拉林铁路 工程地质问题 特殊岩土 不良地质 选线原则 

分 类 号：U212.2[交通运输工程—道路与铁道工程]