摘要
研究目的:近年来,我国在西部铁路建设过程中的复杂地质问题逐渐显现,西部地区广泛分布的三叠系板岩、新近系砂岩地层极大地增加了隧道建设难度。本文依托新建西宁至成都铁路穿越拉脊山隧道工程,针对高压气体、弱成岩地层等复杂地形地质条件和山区铁路施工运营特点,对复杂地层中长隧道选线及工程问题开展研究。通过对拉脊山地质特征及设置长大隧道工程适应性分析,提出艰险山区铁路选线原则和方法。研究结论:(1)结合工程地质条件和类似工程经验,确定线路方案选择原则,从施工难度与风险、辅助坑道设置、隧道设置和工程投资等方面对比分析了不同方案适应性,结果表明绕避高压气体、最短通过弱成岩地层设隧方案最优;(2)结合工程建设难点,对隧道修建、施工方案、高压气体以及弱成岩地层隧道结构设计等关键问题分别研究,并给出了对应工程措施;(3)本文结论可为后续类似工程建设提供参考。
Research purposes:In recent years,attention has been paid on the problem of complex strata during the process of railway construction in Western China.The widely distributed Triassic slate and Neogene sandstone strata greatly increase the difficulty of tunnel construction.In this paper,based on the newly-built tunnel project of Xining to Chengdu railway crossing the Laji Mountain,in view of the complex topographic and geological conditions such as high-pressure gas,weak diagenetic strata and the characteristics of railway construction and operation in mountainous areas,the route selection and engineering problems of long length tunnel in complex strata are studied.Based on the analysis of the geological characteristics and the adaptability of the long tunnel project,and the principles and methods of railway line selection in dangerous mountain area are put forward.Research conclusions:(1)According to the engineering geological conditions and the similar engineering experience,the route scheme selection principle is determine,the adaptability of different schemes is compared and analyzed from the aspects of the construction difficulty and risk,the auxiliary tunnel setting conditions,tunnel setting and engineering investment.The results show that the tunnelling scheme bypassing the high pressure gas and passing through the shortest in weak rock stratum is optimal.(2)According to the difficulties of engineering construction,the key problems such as tunnel construction,construction scheme,high-pressure gas and tunnel structure design of weak diagenetic strata are studied respectively,and corresponding engineering measures are given.(3)The conclusions of this paper can provide reference for the subsequent similar engineering construction.
作者
牛远程
NIU Yuancheng(China Railway First Survey and Design Institute Group Ltd,Xi'an,Shaanxi 710043,China)
出处
《铁道工程学报》
EI
北大核心
2022年第8期12-17,共6页
Journal of Railway Engineering Society
关键词
高压气体
弱成岩地层
复杂地形
综合选线
high pressure gas
weak diagenetic formation
complex terrain
comprehensive railway line selection
