苏通大桥地基中敏感优势层工程地质问题分析
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摘要
根据优势面理论,采用优势指标法将敏感优势层分为3级,并确定了苏通大桥地基中的1粉砂层和7粉细砂层为敏感优势层。苏通大桥采用超长灌注桩基础,桩身全部置于土层中,敏感优势层的工程地质问题主要包括桩基承载力问题、软土流变问题及砂土液化问题。本文研究认为,敏感优势层将导致桩基承载力的降低,敏感优势层的流变将影响基坑的稳定性,通过试验得到了土的流变模型参数。此外,敏感优势层皆为砂土层,在震动荷载作用下会发生液化而丧失承载力。
Based on the preferred plane theory, the sensitive preferred stratum is classified into 3 grades, from which the stratum of fine silt-1 and silt—fine-sand-7 in the foundation of Suzhou—Nantong (Sutong) bridge are verified to be the sensitive preferred stratums. To Suzhou—Nantong bridge, the super long piles will be used, and the body of the piles will be all in the soils. So the engineering geology problems of the sensitive preferred stratum include: bearing capacity of the piles, rheology of the soft soil and sand liquefication. The study resumts indicate that because of the sensitive preferred stratum, the bearing capacity of piles will be reduced, the rheology of the soft soil will affect the stability of the pits, by the experiments the parameters of the rheology model are gotten. Under the effect of the quaky loads, the sands is easy to be liqueficated, then the stratums will lose bearing capacity.
Based on the preferred plane theory, the sensitive preferred stratum is classified into 3 grades, from which the stratum of fine silt-1 and silt—fine-sand-7 in the foundation of Suzhou—Nantong (Sutong) bridge are verified to be the sensitive preferred stratums. To Suzhou—Nantong bridge, the super long piles will be used, and the body of the piles will be all in the soils. So the engineering geology problems of the sensitive preferred stratum include: bearing capacity of the piles, rheology of the soft soil and sand liquefication. The study resumts indicate that because of the sensitive preferred stratum, the bearing capacity of piles will be reduced, the rheology of the soft soil will affect the stability of the pits, by the experiments the parameters of the rheology model are gotten. Under the effect of the quaky loads, the sands is easy to be liqueficated, then the stratums will lose bearing capacity.
引文
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罗国煜,吴浩.1991.工程勘察中的新构造—优势面分析原理.北京:地质出版社.
罗国煜.1992.区域稳定性优势面分析理论与方法.岩土工程学报,14(6):10~18.
罗国煜.1993.岩坡优势面分析及其专家系统研究.科学通报,38(21):1979~1982.
罗国煜,陈新民,李晓昭,等.2000.城市环境岩土工程.南京大学出版社,13~19.
蒋建平,高广运,罗国煜.2002.苏通大桥超长灌注桩基持力层分析土工基础,16(4):43~45.
蒋建平.2002.水下大直径超长桩理论分析与工程应用.南京:南京大学出版社.
倪宏革,罗国煜.2000.地下开采中优势面控灾机理分析.地质论评,46(1):71~78.
汪明武,罗国煜.1999.最优化方法在砂土液化势评价中的应用.岩土工程学报,21(6):704~706.
许宏发.2000.桩的抗拔承载力与非线性计算理论研究.南京:中国人民解放军大学工程兵工程学院出版社.
杨志法,王思敬,冯紫良,等.2002.岩土工程反分析原理及应用.北京:地震出版社.
郑榕明,陆浩亮,孙钧.1996.软土工程中的非线性流变分析.岩土工程学报,18(5):2~13.
郑铣鑫,武强,侯艳声.2002.城市地面沉降研究进展及其发展趋势地质论评,48(6):612~618.
ChenChunlin,ZhangHuiming.2000.Someproblemsintriaxialtestsonsaturatedsands.ChineseJournalofGeotechnicalEngineering,22(6):659~663(inChinesewithEnglishabstract).
FluggeW.1975.Viscoelasticity(secondedition).NewYork:ApringVerlagHeidebergBerlin.
LuoGuoyu,WuHao.1991.PrincipleofNeotectonic—preferredPlaneAnalysisonGeotechnicalInvestigation.Beijing:GeologicalPublishingHouse(inChinese).
LuoGuoyu.1992.Analysisofregionalstabilitybytheoryofpreferredplane.ChineseJournalofGeotechnicalEngineering,14(16):10~18(inChinesewithEnglishabstract).
LuoGuoyu.1993.Analysisofpreferredplaneandexpertsystemofrockslope.ChineseScienceBulletin,38(21):1979~1982(inChinese).
LuoGuoyu,ChenXinmin,LiXiaozhao,etal.2000.EnvironmenGeotechnicalEngineering.NanjingUniversityPublishingHouse13~19(inChinese).
JiangJianping,GaoGuangyun,LuoGuoyu.2002.AnalysisofbearinglayerforpilesinSuzhou—Nantonghighwaybridge.SoilEng.AndFoundation,16(4):43~45(inChinesewithEnglishabstract).
JiangJianping.2002.TheoryStudyandEngineeringApplicationofLargeDimeterandSuper-longPileunderWater.NanjingUniversityPublishingHouse,(inChinese).
NiHongge,LuoGuoyu.2000.Astudyofthemechanismofhazardscontrolledbypreferredplaneinundergroundmining.GeologicalReview,46(1):71~78(inChinesewithEnglishabstract).
WangMingwu,LuoGuoyu.1999.Applicationofoptimizationmethodtoassessmentofsandliquefactionpotential.ChineseJournalofGeotechnicalEngineering,21(6):704~706(inChinesewithEnglishabstract).
ZhengRongming,LuHaoliang,SunJun.1996.Nonlinearcreepanalysisforsoftsoilengineering.ChineseJournalofGeotechnicalEngineering,18(5):1~13(inChinesewithEnglishabstract).
ZhengXianxin,WuQiang,HouYansheng,WuMengjie,YingYufei.2002.Advancesandtrendsinresearchonurbanlandsubsidence.GeologicalReview,48(6):612~618(inChinesewithEnglishabstract).
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