滇西红层大变形地质选线风险评价研究  

Risk Assessment Study on Geological Route Selection for Large Deformation in Red Beds of Western Yunnan

作　　者：杜建军 张营旭 宋章[1] 陈伟[1] 沈维[1] DU Jianjun;ZHANG Yingxu;SONG Zhang;CHEN Wei;SHEN Wei(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2025年第2期1-6,共6页High Speed Railway Technology

基　　金：中国铁路经济规划研究院有限公司科研课题(2021YJJ06)。

摘　　要：针对滇西红层区深埋、高地应力以及软弱破碎围岩的隧道工程,软岩大变形问题日益严重,然而在选线阶段缺乏隧道软岩大变形风险评价方法。本研究通过分析滇西红层区隧道工程的勘察与施工数据,基于岩石强度应力比确定软岩大变形等级。研究结果表明,(1)滇西红层区砂泥岩岩心的砂质含量与其天然单轴抗压强度平均值呈正相关;(2)该地区软岩大变形普遍存在,但以低风险为主,不影响该地区隧道选线;(3)局部泥质富集带叠加断裂密集区叠加形成高风险单元,隧道选线应尽量避开;(4)隧道施工中软岩大变形等级与风险评估结果的一致性验证了本研究方法在滇西红层区隧道选线阶段评估软岩大变形风险的适用性。本研究可为滇西红层的深埋长大隧道工程选线提供参考。Tunnel engineering in the deep-buried,high-stress,and weak,fractured rock mass of the red beds in western Yunnan is increasingly confronted with significant soft rock deformation issues.However,there is a lack of risk assessment methods for soft rock deformation during the route selection phase.This study analyzed the survey and construction data of tunnel projects built in the red beds of western Yunnan and determined the grades of soft rock deformation based on the rock strength-stress ratio.The results indicate that:(1)There is a positive correlation between the sand content of sand-mudstone cores and their average natural uniaxial compressive strength in the red beds of western Yunnan.(2)Although large deformation of soft rocks is common in this area,it is mainly low-risk and does not significantly impact tunnel route selection.(3)High-risk units formed by the superposition of locally enriched muddy zones and fault-dense areas should be avoided during tunnel route selection.(4)The consistency between the grades of soft rock deformation and risk assessment results during tunnel construction validates the applicability of the proposed method for assessing soft rock deformation risks during the tunnel route selection in the red beds of western Yunnan.This study can provide a reference for route selection in deep and long tunnel projects in the red beds of western Yunnan.

关 键 词：选线阶段 软岩大变形 风险评价 滇西红层 

分 类 号：U212.22[交通运输工程—道路与铁道工程] U25