木寨岭公路隧道大变形综合评价预测  

Comprehensive Evaluation and Prediction of Large Deformation of Muzhailing Highway Tunnel

作　　者：石州 罗彦斌[1] 陈建勋[1] 刘伟伟[1] 武云飞 SHI Zhou;LUO Yan-bin;CHEN Jian-xun;LIU Wei-wei;WU Yun-fei(School of Highway,Chang'an University,Xi'an Shaanxi 710064,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《公路交通科技》2020年第8期90-98,158,共10页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(41831286)。

摘　　要：基于模糊综合评价法与层次分析法,结合木寨岭公路隧道复杂地质条件下隧道大变形的统计结果,提出了适用于软弱破碎围岩隧道施工阶段大变形快速分级预测的模糊层次综合评价方法。该方法将隧道变形分为无大变形、轻微大变形、中等大变形、严重大变形和极严重大变形5个等级,选取了对隧道大变形影响显著且在隧道施工阶段能够快速获得的岩层产状、强度、完整性和地下水作为大变形的分级和评价指标。为了充分考量4类指标对大变形的影响,共选取了结构面倾角、结构面走向与洞轴线夹角、点荷载强度、掌子面软岩比例、掌子面岩层平均厚度、岩体RQD值、每延米洞长出水量、地下水特征8项亚级指标对大变形进行分级预测。将本方法与陈子全法、孟陆波法和Jethwa法应用于木寨岭隧道5个大变形段进行了工程验证与对比分析。结果表明:实际变形量超过陈法和孟法预测范围上限值的变形量最大可达上限值的2.4倍和4.4倍,隧道大变形实测变形值均位于本研究方法预测的大变形范围内。本预测方法在木寨岭公路隧道变形段的工程实践表明:该方法的工程适用性强,准确度高,可为软弱破碎围岩隧道大变形的分级和预测提供一种新方法和新思路。Based on the fuzzy comprehensive evaluation method and AHP,combining with the statistical results of large deformation of Muzhailing highway tunnel under complex geological conditions,a fuzzy hierarchical comprehensive evaluation method suitable for fast classification prediction of large deformation of soft and fractured surrounding rock tunnel in construction stage is proposed.This method divides the tunnel deformations into 5 grades:no large deformation,slightly large deformation,medium large deformation,severely large deformation and extremely serious large deformation.It chooses occurrence,strength,integrity and groundwater of rock stratum,which have significant influence on large deformation of tunnel and can be obtained quickly in the tunnel construction stage,as the classification and evaluation indicators of large deformation.In order to fully consider the influence of 4 indicators on large deformation,dip angle of structural plane,angle between structural plane direction and tunnel axis,the point load strength,the proportion of soft rock on tunnel face,the average thickness of rock stratum on tunnel face,the RQD value of rock mass,the outflow per 1 m along tunnel and groundwater characteristics are selected for classification and prediction.The proposed method,Chen Ziquan method,Meng Lubo method and Jethwa method are applied to 5 large deformation sections of Muzhailing Tunnel for engineering verification and comparative analysis.The result shows that the actual deformation exceeds the upper limit values of Chen’s and Meng’s prediction ranges up to 2.4 times and 4.4 times of the upper limit respectively,the measured deformation values of large deformation of tunnel are all within the large deformation range predicted by this method.The engineering practice of this prediction method in the deformation section of Muzhailing Highway Tunnel shows that this method has strong engineering applicability and high accuracy,which provides a new method and a new idea for classification and prediction of large d

关 键 词：隧道工程 大变形预测 模糊综合评价 层次分析法 快速识别 软弱互层岩体 

分 类 号：U452[建筑科学—桥梁与隧道工程]