“东构造结”地区铁路工程地质选线研究  

Research on the Geological Route Selection of Railway Engineering in the"Eastern Tectonic Knot"Area

作　　者：何小军[1] 张广泽[1] 徐学渊 HE Xiaojun;ZHANG Guangze;XU Xueyuan(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China;Xu Zhengxuan Geological Innovation Studio of China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]中铁二院劳模(专家)徐正宣地质创新工作室,成都610031

出　　处：《铁道工程学报》2024年第12期11-16,共6页Journal of Railway Engineering Society

摘　　要：研究目的:南迦巴瓦“东构造结”地区具有海拔高、高差大,地壳隆升、板块挤压强烈,河流急速下切,高寒冻融作用强烈的特殊地质环境背景,对铁路工程地质选线提出了前所未有的挑战。本文旨在分析区域内的宏观地质构造以及特殊工程地质问题,提出“东构造结”地区铁路工程地质选线理念和重要原则。研究结论:(1)东久—拉月—通麦是该段地质选线的重难点,线路应尽量远离雅鲁藏布缝合带,走行于北侧冈底斯地块中,尽量利用帕隆藏布北侧的侏罗系花岗岩条带;(2)对泥石流、滑坡、岩堆、危岩落石等重力地质灾害极其发育地段,尽量减少明线段落长度,以隧道下埋形式通过;(3)开展软岩大变形、岩爆、高地温、高地应力等不良地质相关课题研究;(4)重视工程区帕隆藏布峡谷两侧支流地质灾害链的调查研究与风险评估;(5)重视工程区广泛分布的冰碛层的工程特性研究;(6)本研究成果可应用于高山峡谷等类似地区的铁路工程选线。Research purposes:The"eastern tectonic knot"area of Namche Barwa has a special geological environment of high altitude,large height difference,crustal uplift,strong plates extrusion,rapidly river bed scour,and strong frozen-thawed effect,posing unprecedented challenges for railway geological route selection.This paper aims to analyze the macro geological structure of the region and address specific engineering geological issues,and to propose new concepts and important principles for railway geological route selection in the"eastern tectonic knot"area.Research conclusions:(1)Engineering ranges of Dongjiu-Layue-Tongmai is the most important and difficult section,the proposed railway should keep away from the Yarlung Zangbo Suture Belt,making use of the Jurassic granite strip in the north of the Parlung Zangbo River,and walks on Gangdese block.(2)For the developed gravity geological disaster such as debris flow,landslide,rock heap and holding rock-fall,try to pass through by tunnel.(3)Research should be conducted on related issues such as soft rock large deformation,rock bursts,high geothermal conditions,and high geostress.(4)The investigation and risk assessment of the geological disaster chain on both sides of the Palong Zangbo Canyon should be paid attention to.(5)The research on the engineering characteristics of moraine layer widely distributed in the project area should be paid attention to.(6)The research conclusions can be applied to railway route selection in similar regions such as mountainous canyons.

关 键 词：南迦巴瓦“东构造结” 铁路工程地质选线 高山峡谷区 雅鲁藏布缝合带 

分 类 号：U212.22[交通运输工程—道路与铁道工程]