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时间:2020-04-23
《冲击荷载下淤泥地基上覆土层合理厚度试验研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第35卷第3期岩土力学Vbl-35NO.32014年3月RockandSoilMechanicsMar.2014文章维号l1000-7598(2014103-841-06冲击荷载下淤泥地基上覆土层合理厚度试验研究钱晓敏,李彰明,曾文秀(广东工业大学岩土工程研究所,广州5100901摘要:基于某大面积深厚淤泥软基加固处理工程试验,从淤泥地基承载特征考虑,为定量确定软土之上覆盖层(包括原覆盖层及人工填土层)并反映静动力排水固结法中静力、动力荷载和排水体系的相互适应关系,建立了冲击荷载下淤泥地基上覆土层合理厚度的定量模型。
2、对该模型参数地基压力扩散角0、地基承载力特征值、冲击荷载允许应力比R进行分析.讨论。模型中变化的允许应力比直观和定量地反映了冲击荷载大小与软土层排水体系布置方式、软土覆盖层厚度的相互适应关系,也可作为评判软基加固效果的参数。相关试验结果还表明,对于淤泥地基,实际夯击作用下大于《建筑地基基础设计规范》中的23。~3O。。工程应用表明,建立的模型与实际情况有较好的一致性,其定量的表达式也为工程人员设计应用提供了便利,对类似的软土地基处理工程有借鉴或指导意义。关键词:静动力排水固结法;淤泥地基;工程试验;冲击荷载;覆盖层合
3、理厚度;模型参数中图分类号:TU447文献标识码:AIn—situtestsandanalysesofreasonablecoveringthicknessformuckfoundationunderimpactloadQIANXiao—min,LIZhang—ming,ZENGWen-xiu(InstituteofGeotechnicalEngineering,GuangdongUniversityofTechnology,Guangzhou510090,China)Abstract:Basedonengineer
4、ingtestsofmuckfoundationtreatmentproject,amodelofthereasonablethicknessofoverburdenonmuckfoundation(includingtheoriginalcoveringandartificialfillingsoil)isestablishedusingstatic-dynamicdrainageconsolidationmethodunderimpactloading.Thebasicconsiderationsofthemod
5、elarethebearingstratumcapacityofmuckfoundationandtheadaptiverelationsamongstaticloading,dynamicloadinganddrainagesystem.Furtheranalysisismadeofthemodelparametersincludingfoundationpressuredifusionangle0,bearingcapacityeigenvaluesofmuckfoundation厶andmaximumallow
6、ablestressratioR.TheparameterRinthemodelvisuallyandquantitativelyreflectsthemutualadaptationrelationshipsamongimpactloading,distributionofdrainagesystemandthicknessofoverburden.Inaddition,theparameterRcanbeusedasevaluationparameterformuckfoundationreinforcement
7、efects.Andtheresultsofrelevanttestsalsoshowthatparameter0hasalargervalueunderactualtampingthanthe23O30。intheCodeforDesignofBuildingFoundationofChina.Engineeringapplicationsindicatethatthemodelisingoodagreementwiththereality;andthequantitativerelationalsoprovide
8、sconvenienceindesignandapplicationforgeneralengineeringstaif,whichCanbeusedforreferenceorguidanceinsimilarsoftfoundationtreatmentprojects.Keywords:static—dynamicdrainagecons
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