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时间:2020-03-24
《基于动态压缩模量的路基工后沉降计算研究.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、第40卷第4期四川建筑科学研究2014年8月SichuanBuildingSciencel97基于动态压缩模量的路基工后沉降计算研究栗金文,洪宝宁,刘鑫。,贺国庆(1.河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098;2.核工业第五研究设计院,河南郑州450000;3.河海大学隧道与轨道工程研究所,江苏南京210098)摘要:基于太沙基单向固结理论,结合土体变形计算公式,推求饱和土压缩模量的表达式。研究饱和土体压缩模量随固结度、固结系数和排水路径的变化规律,并分析了压缩模量的时间效应及其在路基工后沉降预估
2、中的应用研究。结论表明:1)固结初期,压缩模量随固结度增加呈缓慢线性增长;固结度U>60%时,压缩模量增长速度加快;固结后期,压缩模量增加很少;2)固结时间相同,压缩模量随固结系数增加而增加;固结系数C<5000em/a时,压缩模量几乎不变;3)双面排水时的压缩模量增长速度远大于单面排水;4)压缩模量随时间呈近似线性增长,且存在上限值;利用动态压缩模量可有效预估路基工后沉降。关键词:压缩模量;固结;固结系数;排水路径;时间效应;工后沉降中图分类号:TU472文献标志码:A文章编号:1008—1933(2014)04—19
3、7—04Researchoncalculatingpost-constructionsettlementofroadfoudationbasedondynamiccompressivemodulusLIJinwen,HONGBaoning,LIUXin,HEGuoqing(1.KeyLaboratoryofMinistryofEducationforGeomechanicsandEmbankmentEngineering,HohaiUniversity,Nanjing210098,China;2.TheFifthRese
4、archandDesignInstituteofNuclearIndustry,Zhengzhou450000,China;3.TunnelandRailProjectResearchInstitute,HohaiUniversity,Nanjing210098,China)Abstract:BasedontheTerzaghione-dimensionalconsolidationtheory,combinedwithsoildeformationformula,themathematicalexpressionofc
5、ompressivemodulusofsaturatedsoilisderived.Withthevariationofconsolidationdegree,coeficientofconsolidationanddrainagepath,compressivemodulusofsaturatedsoilisstudied,anditstimeeffectanditsapplicationinpredictingpost—constructionsettlementofroadfoudationisanalyzed.T
6、heresultsshow:1)Withconsolidationdegreeincreasing,compressivemodulushaslinearandslowgrowthintheearlystageofconsolidation;ItsgrowthratebecomeslargerasconsolidationdegreeU>60%;Ithasnofurtherincreaseinthelaterperiod;2)Withtheconsolidationcoeficientincreasing,compres
7、sivemodulusincreasesunderthesameconsolidationtime;ItchangeslittleastheconsolidationcoeficientC<5000cm/a;3)Underdoubledsideddrainage,thegrowthrateofcompressivemodulusisfargreaterthanunderthesingle—sideddrainage;4)Compressivemodulusapproximatelyincreaseslinearlyove
8、rtime,andithasanupperlimit;It’Sefectivethatpredictingpost-constructionsettlementthroughusingdynamiccompressivemodulus.Keywords:compressivemodulus;consolidation
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