公路隧道围岩压力研究与发展.docxVIP

3公路隧道围岩压力研究与发展曲海锋1,杨重存1,朱合华1,2,王华牢3,杨彦民3(1.同济大学地下建筑与工程系,上海200092;2.同济大学岩土工程重点实验室,上海200092;710075)3.中交第一公路勘察设计研究院,西安摘要:由于岩土体性质、地应力、边界条件、施工过程等方面的复杂性和随机性,使得公路隧道围岩压力的确定或计算变得十分困难。近百多年来,国内外的学者不断地结合新工艺、新技术,从不同角度出发对其进行了深入的研究,从最初的松动压力到现在的形变压力、从经验公式法到反分析预测法等,取得了不少有价值的成果。但随着近年来公路隧道的结构越来越复杂、断面越来越大,现有的这些围岩压力的计算方法已很难满足其建设的需要,发展更加合理的围岩压力计算方法已经成为一种迫切的需要。作者首先对经验公式法、理论计算法、现场量测法、模型试验法和反分析预测法等围岩压力计算方法的研究和发展进行分析和评价,指出这些方法中普遍存在的问题。在此基础上对我国公路、铁路隧道中经验公式的适应性和适用性进行了重点讨论,旨在为公路隧道围岩压力计算的研究和发展提供借鉴和参考意义。关键词:围岩压力;荷载结构法;经验公式;公路隧道中图分类号:U451.1文献标识码:A文章编号:167320836(2007)0320536208ResearchandDevelopmentonSurroundingRockPressureofRoadTunnelQUHai2feng1,YANGZhong2cun1,ZHUHe2hua1,2,WANGHua2lao3,YANGYan2min3(1.DepartmentofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,P.R.China;2.KeyLaboratoryofGeotechnicalEngineering,TongjiUniversity,Shanghai200092,P.R.China3.TheFirstHighwaySurveyDesignInstituteofChina,Xi’an710075,P.R.China)Abstract:Itisverydifficulttocalculateordeterminethesurroundingrockpressureofroadtunnelbecauseofcomplicationandrandomnessoftherockmasscharacter,parameterofgroundstress,boundaryconditionandcon2structionprocess.Sincethe20thcentury,lotsofscholarshavebeenstudyingitfromdifferentanglewiththenewtechniqueandmethodprofoundly,suchasfromloosening-pressuretodeformation-pressureandfromtheexperi2enceformulatothebackanalysismethod,andmanyresearchproductionshavebeenacquired.However,withmoreandmorecomplexityandlargecross-sectionoftunnelstructure,currentcalculationmethodsofsurroundingrockpressurecannotanswertheneedsofconstructionofroadtunnelinlargedegree.Therefore,developmentofmoreap2propriatecalculationmethodofsurroundingrockpressureisanimminentneedcurrently.Inthispaper,theempiricalformula,theoreticalcalculation,in-situmeasurement,model-experiment,backanalysisasthemethodstoobtainsurroundingrockpressureoftunnelaregeneralizedandanalyzed,andtheproblemsofthesemethodsarealsopointedoutanddiscussed.Then,theapplicabilityofempiricalformulasofsurroundingrockpressureofroadandrailwaytun2nelinChinaisstudied.