新近沉积土强夯地基处理试验研究

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1、同济大学硕士学位论文新近沉积土强夯地基处理试验研究姓名：张晓哲申请学位级别：硕士专业：岩土工程指导教师：高广运20040601摘要黄泛区郑州某机场跑道地基属新近沉积土，需加固处理。为了减少场区地基的不均匀沉降、消除地基土的液化，采用强夯法对地基进行处理。大面积处理前，须进行试验，以确定合理的夯击能、夯击遍数等夯击参数。整个试验区分两个大区，八个小区。试验分别涉及不同的工程地质情况和工程地质条件相近条件下不同夯击能、不同布点方式、布点间距、填土与不填土、设排水板与不设排水板等多种情况。本次试验结果表明，该场地适合采用强夯法进行地基处

2、理。在中等夯-挑(2000--3000kN．m)下东试验区的有效夯实系数在0．6以上，西试验区的有效夯实系数在O．75以上。强夯法能够有效消除工后沉降，提高地基承载力和压缩模，地表以下10m范围内土层液化势得以消除，填土压实度达到了机场设计的要求。另外通过本次试验，还对影响深度、单击夯能、影响范围等施工参数提出了合理的意见和建议。关键词：新近沉积土；强夯法；有效夯实系数；压缩模量；压实度；地基承载力；工后沉降ABSTRACTThesomeaerodromeinZhengzhouisbasedOnrecentlydepositeds

3、oil．Thesubgradeneedstobeimproved．ThedynamicconsolidationmethodisadoptedtOdealwiththegroundinordertodecreasetheasymmetricsettlementofthegroundandtOeliminatetheliquefactionofthe1stand2ndlayerofthe9110und．Theexperimentationmustbedonetodeterminesomeappropriateparameterssu

4、chascompactingenergyandnumbersbeforeacross．theboardtreatment．Thewholeexperimentationareaisdividedintotwobigsectionsoreighlsmallsections．Theexperimentisdoneundertheconditionsofthedifferentcompactingenergy,differentdistributingpointmethod，differentpointspacing，whetheror

5、110tfillingsoil．whetherornotsettingdrainageboardandSOon，whichreferthedifferentorsimilarengineeringgeologicconditions，Theexperimentationresultsshowedthatitisappropriatefortheareatoadoptthecompactingmethodtodealwiththeground．Theeffectivecompactingcoefficientineastexperi

6、mentationspotwasabove0．6andwasaboveO．75inwestspotundermediumcompactingenergy(2000-3000kN．m、．Itapprovedthatthecompactingmethodcouldeliminateeffectivelyresidualsettlement，increasebearingcapacityoffoundationsoilandcompressingmodulus．Theliquefactionpotentialofthegl’oundun

7、der1Omwaseliminatedandthecompactnessofthefillingsoilcouldmeetthedesignrequirementsoftheaerodrome．Someeffectivesuggestionsabouttheconstructionparameterssuchastheinfluencingdepth，singlecompactingenel‘gYhavebeenproposed．Keywords：recentlydeposi伦dsoil；dynamicconsolidation；

8、effectivecompactingfacto：compressingmodulus；compactnesslbearingcapacityoffoundationsoll：residualsettlement声明本人郑重声明：本论文是在导师的指