真空填土自载联合预压加固软土机理及其实际应用研究

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1、浙江大学博士后学位论文真空-填土自载联合预压加固软土机理及其实际应用研究姓名：李昌宁申请学位级别：博士后专业：岩土工程指导教师：龚晓南20031201ABSTRACTThecontradictionbetweenrapideconomicgrowthandhigh．speedtransportationdemandineasternareasmakesitnecessaryandemergencytobuildhigh—speedrailwayinsoftground．It’Struethatbuildingthehigh—sp

2、eedrailwayinsoftgroundismoredifficultthaninothergroundconditionsbecausethedemandofembankmentsettlementafterprojectioniSnoteasytocontrolandmeetwhichisstrictlyrequiredinbuildinghigh—speedrailwayduetothewellknownreasons．Thatrequirestheeffectiveandeconomicsoftgroundtreat

3、menttomakesurethattheembankmentofsettlementafterprojectionmeetsdemanding．Thecombinedmethodofvacuum—surchargepreloadingisfeasibleandwidelyusedintreatingsoftgroundwithseveraladvantagessuchassavingmoney，shorteningtimeandSOon．Butrecentstudyonvacuumpreloadingconsolidating

4、softgroundisstillnotcompletelydemonstratingthemechanismofitthatmakesitabsolutelynecessarytoresearchfurthcrinit．Throughtheoreticalanalyzingandlabexperimentscombinedwithsitemodeltests，thepaperputsforththedesignofcombinedmethodofvacuum-surchargepreloadingintreatingdeepa

5、ndcomplicatedsoftgroundofhigh—speedrailway，itsfeasibletechnicsandeffectstosurroundingenvironment．Somekeytechniquessuchaseffectiveconsolidationdepth，relationofconsolidationresultandvacuumenergy，settlementcontrolafterprojectionandmeasurestocontroleffectstosurroundingen

6、vironment，ere．，aresolvedtosomeextent．Theresultsobtainedareimportanttodevelopandperfectthemechanismofvacuumpreloadinginconsolidatingsoftground，whichcouldbewidelyusedintreatingdeepandcomplicatedsoftgroundofhighspeedrailwayeffectivelyandeconomically．Keywords：combinedmet

7、hodofvacuum—surchargepreloading；softground；high·speedrailway；settlementafterprojection2前言随着我国东部经济快速增长与交通运输需求之间矛盾曰益突出．修建京沪高速铁路以及东部地区城际高等级铁路已迫在眉睫。高速铁路对路基的变形控制要求很高，它提高了对路堤地基条件的要求，强调对工后沉降的严格要求，这就要求对地基进行经济、有效的处理。京沪及东部城际高速铁路沿线软土地基不但分布广泛，而且成因类型复杂，厚度大，-。般地基处理方法成本高、难度大。真空一填土自

8、载联合预压技术具有良好的经济性和独特的优越性，其特点是路基的填筑土可作为堆载荷载与真空起联合进行预压，路基稳定性不存在问题，填土速率也不受限制；路基填筑完成后，其上不必继续堆载超载土方，真空可相当于超载加速土体固结速度，没有超载土方的堆移和挖除工程，缩短工期：在