浅埋洞室围岩压力若干问题研究

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1、同济大学硕士学位论文浅埋洞室围岩压力若干问题研究姓名：王晓形申请学位级别：硕士专业：土木工程·结构工程指导教师：丁文其20060101摘要压力由围岩与初衬承担30～40％；V级围岩，压力由围岩与初衬承担10～30％；VI围岩，则由二衬承担全部压力；(4)基于地层结构法分析，从施工方案(工序)角度研究了洞室开挖过程中的支护结构对围岩压力的响应，并对几种典型工况进行了比较分析；从长期监测数据着手，初步研究了软弱围岩条件下洞室围岩压力的时间效应，并着重讨论了仰拱在其间的力学行为。关键词：浅埋洞室围岩压力连拱隧道双塌落拱荷载同济大学申请硕士学位论文浅坶

2、洞室围岩压力若干问题研究ABSTRACTWiththerapiddevelopmentofnationaleconomysuchastheenergysources，communication，nationaldefensemunicipalengineering，andmineengineeringetc，andglobalenvironmentalprotectionandtheneedofsustainabledevelopmentforthehumanbeing，theconstructionsofundergroundengineer

3、inghavegotmoreandmore．Recentlyyears，withthedevelopmentofcommunicationinfi'astructurehasbeenincreasedsharplNAndthereappearmoreandmoretunnelsinevitablywiththeexpansionofhighways．Butthereexistsomeproblemsinthedesignandconstructioninundergroundproject．Theseproblemscauselandslide

4、，liningcrackorexcessivesafetNwhichleadstothelargewasteofhumanandmaterialresources．Theexistingproblemswhichneedfurtherresearcharelistedasfollow．(1)Thetwintunnel，asanewstructurestyle，hasobviousdominanceinmiddleandshortlengthtunnel．Anditsrationalloadmodeiswhatthedesignerfocuses

5、on．(2)TheCodeforDesignofRoadTunnel(JTGD70—2004)introducetherock-structuremethodtotherockpressurecalculationofdeepseatedtunnelforrockclassI~ⅣButtherockpressureofshallowtunnelarestillcalculatesaslooseningload．Infact，therockdisplaysself-bearingcapacityinsomeshallowburiedcavems．

6、Howtodeterminetheloadratiobearedbytherockitselfisthekeytooptimizedesign，whichisstillapuzzlewefacetoday．(3)TherearesubjectiveandobjectiveindeterminaciesindesignbyFEM．Theyarethecalculationmode，thecalculationparameters，calculationassumption，dataandinformationshortageindesignand

7、construction，andetc．TheFEMcallnotgiveUSquantitativedesigningparameters，butqualitativeanalysis．Andtheotherproblemssuchastheprotectionoftheplantcoverandhistoricbuildingswhileexcavating，integralcollapseoftheshallow-seatedcavern，blowupoftheinvertedarchalSOexist．Theresearchiscarr

8、iedoncombinedwiththeKeyTechnologiesInTheConstructionofTwinTunnel，whichisWes