粘土永久变形预估模型试验与仿真研究
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摘要
路基永久变形影响沥青路面的车辙,经详细分析推荐出路基土永久变形试验方案,对粘土进行了重复加载动三轴试验,建立了塑性应变和荷载作用次数之间的关系式,使用最小二乘法拟合出该式中的系数与含水量和回弹模量之间的回归公式.采用扩展的Drunker-prager土体本构模型,对于粘土重复加载动三轴试验进行了有限元仿真.试验曲线或有限元仿真曲线与预估模型均比较吻合,相关系数R2均在0.99以上;模型参数的回归公式的相关系数R2最小值为0.53,大于临界值0.50.分析结果表明:建立的粘土永久变形预估模型可靠性较高,可以用有限元仿真来代替部分室内重复加载动三轴试验.
The permanent deformation of subgrade has effects on the rutting of asphalt pavement.The program of permanent deformation tests of subgrade soils was established through analysis in detail.Repeated loads tests were conducted with clay.The basic relationship between the permanent strain and the number of load applications was found,and the regression formula between the coefficients in the models and a moisture content and a resilient modulus were found with the least square method.At last,extended Drunker-Prager model was used to clay and the repeated load triaxial tests were simulated by the finite element method.The square of the correlative coefficient between the calculated curve and measured or numerical simulated one was as great as 0.99.The minimum square of the correlative coefficient of the regression formula of the coefficients in the models was 0.53 which was greater than the critical value of 0.50.Results show that the permanent deformation prediction model for a clay founded have high reliability,and some repeated load triaxial tests can be replaced by finite element simulations.
The permanent deformation of subgrade has effects on the rutting of asphalt pavement.The program of permanent deformation tests of subgrade soils was established through analysis in detail.Repeated loads tests were conducted with clay.The basic relationship between the permanent strain and the number of load applications was found,and the regression formula between the coefficients in the models and a moisture content and a resilient modulus were found with the least square method.At last,extended Drunker-Prager model was used to clay and the repeated load triaxial tests were simulated by the finite element method.The square of the correlative coefficient between the calculated curve and measured or numerical simulated one was as great as 0.99.The minimum square of the correlative coefficient of the regression formula of the coefficients in the models was 0.53 which was greater than the critical value of 0.50.Results show that the permanent deformation prediction model for a clay founded have high reliability,and some repeated load triaxial tests can be replaced by finite element simulations.
引文
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[2]QI U Y,DENNIS N D,ELLIOTT R P.Deformation characteristics of subgrade soils under repeated loading[J].Geotechnical Engineering,1999,30:85-97.
[3]TSENG K,LYTTON R.Prediction of permanent deformation in flexible pavement materials[J].Implication of Aggregates in the Design,Construction,and Performance of Flexible Pavements,1989,1016:154-172.
[4]AYRES MJ.Development of a rational probabilistic approachfor flexible pavement analysis[D].College Park:U-niversity of Maryland,1997.
[5]Transportation Research Board of the National Academies.Guide for mechanistic-empirical design of newand reha-bilitated structures NCHRP1-37A[R].Washington D C:Transportation Research Board of the National Acade-mies,2004.
[6]UZANJ.Permanent deformationinflexible pavements[J].Journal of Transportation Engineering,2004,130(1):6-13.
[7]ZHAO Y S,DENNIS N D,ELLIOTT R P.Prediction of subgrade permanent strain using simple soil properties[J].ASCE Geotechnical Special Publication,2004,126:1076-1085.
[8]梁伟.砂土永久变形预估模型试验和仿真研究[D].西安:长安大学,2008.LIANG Wei.Study on the permanent deformation rrediction model of sand through tests and simulations[D].Xi′an:Chang′an University,2008.
[9]ELLIOTT R P,DENNIS N D,QI U Y.Permanent deformation of subgrade soils[R].Fayetteville:Mack-Blackwell Transportation Center,University of Arkansas,1998.
[10]JTG B01-2003.公路工程技术标准[S].北京:人民交通出版社,2004.JTG B01-2003.Technical standard of highway engineering[S].Beijing:China Communications Press,2004.
[11]郭忠印,丛林,高启聚,等.路基和粒料抗永久变形性能预估研究[R].上海:同济大学,2007.GUO Zhong-yin,CONG Lin,GAO Qi-ju,et al.Study on the permanent deformation prediction model of soil and aggregrate[R].Shanghai:Tongji University,2007.
[12]张洪亮,胡长顺,高江平.移动车辆荷载作用下路基中压应力测试[C]//第五届交通运输领域国际学术会议论文集.北京:人民交通出版社,2005:131-139.ZHANG Hong-liang,HUChang-shun,Gao Jiang-ping.Measurement of compressive stress in subgrade of asphalt pavement under moving load[C]//Proceedings of the5th international conference of transportation professionals.Beijing:China Communications Press.2005:131-139.
[13]朱以文,蔡元奇,徐晗.ABAQUS与岩土工程分析[M].香港:中国图书出版社,2005.ZHU Yi-wen,CAI Yuan-qi,XU Han.ABAQUS and geotechnical engineering analysis[M].HongKong:China Book Press,2005.
[14]范文,闫芙蓉,俞茂宏.考虑各向异性损伤的统一弹塑性损伤模型[J].西安建筑科技大学学报:自然科学版,2009,41(3):318.FAN Wen,YAN Fu-rong,YU Mao-hong.Unified elastic-plastic damage model considering anisotropic damage[J].J.Xi′an Univ.of Arch.&Tech.(Natural Science Edition),2009,41(3):318.
[15]王琴,陈隽,李杰.地下管线非一致地震激励振动台试验的三维有限元建模[J].建筑科学与工程学报,2008,25(3):51-57.WANG Qin,CHENJun,LI Jie.3-Dfinite element modeling of underground pipeline under non-uniformearthquake excitationin shaking table tests[J].Journal of Architecture and Civil Engineering,2008,25(3):51-57.
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