基于蠕变试验的黄土高填方工后沉降规律数值研究.pdf

《基于蠕变试验的黄土高填方工后沉降规律数值研究.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、西安理工大学学报JournalofXi’anUniversityofTechnology(2015)Vo1．31No．3295文章编号：1006—4710(2015)03—0295—06基于蠕变试验的黄土高填方工后沉降规律数值研究葛苗苗，李宁，郑建国，朱才辉，马旭东(1．西安理工大学岩-kI程研究所，陕西西安710048；2．机械工业勘察设计研究院，陕西西安710043)摘要：为了研究黄土高填方工后沉降规律，开展一系列压实黄土一维固结蠕变试验，分析含水率及压实度对黄土蠕变特性的影响，验证了Burger蠕变模型在描述压实黄土应变与时间关系上的适用性，在该模型基础上，运用FLA

2、C3D计算了黄土高填方工后沉降规律。结果表明：轴向加载瞬时，试样变形速率较大，随着时间的推移，变形速率减小并趋于稳定，压实黄土蠕变随含水率的提高而增加，随压实度的提高而减小。工后沉降对填料压实标准更敏感，在一定压实度和含水率范围内，工后沉降与含水率和压实度呈线性关系。可以通过高填方工后沉降速率和时间关系曲线上的拐点位置判断工后沉降稳定时间，填料压实度越低、含水率越大，拐点越靠后，沉降稳定的时间越长。关键词：压实黄土；固结蠕变试验；蠕变曲线；Burger模型；数值分析；工后沉降中图分类号：TV732．3文献标志码：ANumericalanalysisofthepost—con

3、structionsettlementregularityofloess—highfilledembankmentbasedoncreeptestGEMiaomiao，LINing，ZHENGJianguo，ZHUCaihui，MAXudong(1．InstituteofGeotechnicalEngineering，Xi’anUniversityofTechnology，Xi’an710048，China；2．ChinaJKInstituteofEngineeringInvestigationandDesign，Xi’an710043，China)Abstract：Ino

4、rdertostudythepost—constructionsettlementregularityofloess—highfilledem—bankment，theauthorhasconductedaseriesofuniaxialcompressioncreeptestswithcompacted1oess，analyzedtheeffectofthemoisturecontentandcompactiononcreeppropertiesofcompac—tedloess．TheapplicabilityofBurgermodelontherelationship

5、betweenstrainandtimeofthecompactedloessiSverified．Withthismode1astheconstructiveFLAC3DiSusedtocalculatethesettlementofpost—constructionoftheloesshighembankment．Theresultsshowthatthedeform—ationrateofthesampleislargerataxialinstantloadingandasthetimegoeson，thedeformationratedecreasesandtend

6、stobestable：withthemoisturecontentthecreepdeformationofloessiSincreasing，thedegreeofcompactiongetlowerwiththeimprovementofcompactdegree．Thepost—constructionsettlementiSmoresensitivetothecompactionstandardoftheloess．Thepost—constructionsettlementiSalinearrelationwithmoisturecontentandcompac

7、tiondegreewithinacertainrange．TheinflectionpointpositionontheVs-tcurveofhighearthfillingworkpostsettle—mentcanbeusedtoestimatethestabilitytimeofthepost—constructionsettlement．The1owerofthecompactiondegreeoffillingmaterials，thehighermoisturecontentofthefillingm