装订线毕业设计说明书（毕业论文）兰州市南山路五标民大隧道（东段）结构设计专业：岩土与地下工程学生：xxx指导教师：xxxPAGE\*MERGEFORMAT94摘要拟建兰州市南山路五标民大隧道（东段），位于兰州市城关区五泉山下，处于南山路东段。，民大隧道结构，采用现浇矩形闭合框架混凝土结构。隧道断面形式采用双洞，洞宽14m，高5m，上覆土层2m，重度为。隧道所处位置地形复杂、地面建筑物多。隧道基坑开挖深度17米，由于场地限制，需在基坑开挖前进行基坑支护。通过对拟建场地的工程地质条件分析，基坑边坡为两级支护，分别为6.0m，11.0m.在本次基坑支护设计过程中，考虑到施工经济等原因，根据场地的土层条件及兰州市类似基坑工程的经验，为保证基坑的稳定性及尽量节省投资，先后分析了三种方案：1.土钉墙支护；2.桩-锚支护；3悬臂梁支护.基坑支护结构设计的安全等级按一级考虑，重要性系数取γ0=1.1。关键词：土钉墙多支点排桩基坑支护矩形闭合框架AbstractProposedcompositecommercialresidentialbuildingsinHandanCity,RochesterheadHandanurbansouth,thewestsideofthestreetbrightlightdrinksfactory,29oftheground,undergroundfloor,buildingheight87.0m,theformofashearwallofthestructure,thefoundationdesignclassCategoryBare.Pitdepthof10m.Throughtheproposedvenueoftheengineeringgeologicalconditions,theshallowgroundwaterlevelbyretainingmeasures.Aslittledepthofexcavation,itmaytrytoconsideradoptingasimplerfoundationpitsupportmeasurestoensurethatthebasisfornormalconstructionandthesafetyofthemainundergroundstructuresandsurroundingbuildingswillnotbeharmed.Inthepitsupportingthedesignprocess,takingintoaccounttheconstructionofeconomicandotherreasons,accordingtothesiteandsoilconditionssimilarexcavationworksinHandanCityofexperience,toensurethestabilityofthepitandsaveasmuchaspossibleinvestment,thepitwallToarankingofthedifferentlevelsofpitwalltoadifferentsupportprogrammes.Hasanalyzedtwooptions:1.Cantileverpilesupport,2.Cantileverpileandbolting3.Soilnailwallsupport.Asdeeppit,pilescantilevercalculateddeformationanddisplacementofverylargeeconomicandreinforced,sobeexcluded.Cantileverpileandtheanchoroftheprogramme,additionalsingle-soildrainagefromtheretainingwalloftherole.Inadditiontothenorthpitwallforthetwogrades,therestwerelevel,usingthesamesupportprogramme.Keywords:SoilnailwallSinglefulcrumpilePitSupport目录TOC\o"1-2"\h\z\uHYPERLINK\l_Toc15973摘要PAGEREF_Toc159731HYPERLINK\l_Toc24883绪论1.1基坑工程的特点和发展概况PAGEREF_Toc248835HYPERLINK\l_Toc177552基坑支护设计