粗粒料广义塑性模型对不同应力路径适应性研究
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摘要
结合两种不同岩性的粗粒料在等σ1、等σ3、等p以及等应力比应力路径下的大型三轴试验和侧限压缩试验成果,研究了粗粒料广义塑性模型对不同应力路径的适应性.结果表明:广义塑性模型很好地反映了粗粒料变形的应力路径相关性.同时根据Roadford坝坝料的三轴试验结果得到的模型参数,对大坝进行了有限元数值模拟,计算得到的大坝填筑后的变形与实际监测结果吻合较好.表明广义塑性模型也能较好地反映土石坝施工期应力路径对坝体变形的影响.
Based on a series of large-scale triaxial tests and confined compression tests,the stress paths of coarse grained soil with two kinds of rock properties under constantσ1,constantσ3,constant pand constant stress ratio are simulated by the generalized plastic model to study the adaptability of model for stress paths of coarse grained soil.Through the comparison between numerical simulations and test results,it is testified that the deformation of coarse grained soil under complex stress paths can be well reflected by the generalized plastic model.At the same time,the Roadford dam is simulated by a finite element procedure,and the parameters of the generalized plastic model are calibrated by triaxial experiments of rockfill materials of Roadford dam.The numerical results agree well with in-situ monitoring records of dam deformation.It is concluded that the effects of stress paths on dam deformation during construction can be well reflected by the generalized plastic model.
Based on a series of large-scale triaxial tests and confined compression tests,the stress paths of coarse grained soil with two kinds of rock properties under constantσ1,constantσ3,constant pand constant stress ratio are simulated by the generalized plastic model to study the adaptability of model for stress paths of coarse grained soil.Through the comparison between numerical simulations and test results,it is testified that the deformation of coarse grained soil under complex stress paths can be well reflected by the generalized plastic model.At the same time,the Roadford dam is simulated by a finite element procedure,and the parameters of the generalized plastic model are calibrated by triaxial experiments of rockfill materials of Roadford dam.The numerical results agree well with in-situ monitoring records of dam deformation.It is concluded that the effects of stress paths on dam deformation during construction can be well reflected by the generalized plastic model.
引文
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[19]Kovacevic N,Potts D M,Vaughan P R.Recent advances in the numerical modelling of embankment dams[C]//Ensuring Reservoir Safety into the Future:Proceedings of the 15th Conference of the British Dam Society.London:Thomas Telford Services Ltd.,2008.
[2]日本土质工学会.粗粒料的现场压实[M].郭熙灵,文丹,译.北京:中国水利水电出版社,1999.Association of Geotechnique of Japan.In-situ Compaction of Coarse-grained Materials[M].GUO Xi-ling,WEN Dan,trans.Beijing:China Water Power Press,1999.(in Chinese)
[3]张林洪,刘荣佩,谢婉丽.等应力比路径条件下堆石料的应力应变特性[J].大坝观测与土工测试,2001,25(4):46-49.ZHANG Lin-hong,LIU Rong-pei,XIE Wan-li.Properties of stress and strain of rockfill under the path of equal stress ratio[J].Dam Observation and Geotechnical Tests,2001,25(4):46-49.(in Chinese)
[4]高正中,胡德金,张青云.复杂应力路径下土的本构模型研究[J].四川联合大学学报:工程科学版,1997,1(5):50-56.GAO Zheng-zhong,HU De-jin,ZHANG Qingyun.Study of constitutive model of soil under complex stress path[J].Journal of Sichuan Union University:Engineering Science Edition,1997,1(5):50-56.(in Chinese)
[5]陈生水,沈珠江,郦能惠.复杂应力路径下无粘性土的弹塑性数值模拟[J].岩土工程学报,1995,17(2):20-28.CHEN Sheng-shui,SHEN Zhu-jiang,LI Neng-hui.An elastoplastic model for cohesionless soils under complex stress paths[J].Chinese Journal of Geotechnical Engineering,1995,17(2):20-28.(in Chinese)
[6]高莲士,赵红庆,张丙印.堆石料复杂应力路径试验及非线性K-G模型研究[C]//国际高土石坝学术会议论文集.北京:中国水利水电出版社,1993:110-117.GAO Lian-shi,ZHAO Hong-qing,ZHANG Bingyin.Study on the nonlinear uncoupled K-G model for rockfill under the complicated stress paths[C]//Proceedings of International Symposium on High Earth-rockfill Dams.Beijing:China Water Power Press,1993:110-117.(in Chinese)
[7]卢廷浩,钱玉林,殷宗泽.宽级配砾石土的应力路径试验及其本构模型验证[J].河海大学学报,1996,24(2):74-79.LU Ting-hao,QIAN Yu-lin,YIN Zong-ze.Stressstrain behavior and constitutive models for wide grading of gravelly soil[J].Journal of Hohai University,1996,24(2):74-79.(in Chinese)
[8]张宗亮,贾延安,张丙印.复杂应力路径下堆石体本构模型比较验证[J].岩土力学,2008,29(5):1147-1151.ZHANG Zong-liang,JIA Yan-an,ZHANG Bingyin.Comparison and verification of constitutive models for rockfill materials under complex stress path[J].Rock and Soil Mechanics,2008,29(5):1147-1151.(in Chinese)
[9]Zienkiewicz O C,Leung K H,Pastor M.Simple model for transient soil loading in earthquake analysis.I:basic model and its application[J].International Journal for Numerical and Analytical Methods in Geomechanics,1985(9):453-476.
[10]Pastor M,Zienkiewicz O C,Leung K H.Simple model for transient soil loading in earthquake analysis.II:non-associative models for sands[J].International Journal for Numerical and Analytical Methods in Geomechanics,1985(9):477-498.
[11]Sun L X.Centrifugal testing and finite element analysis of pipeline buried in liquefiable soil[D].New York:Columbia University,2001.
[12]于玉贞,卞锋.高土石坝地震动力响应特征弹塑性有限元分析[J].世界地震工程,2010,26(S1):341-345.YU Yu-zhen,BIAN Feng.Elasto-plastic FEM analysis of dynamic response of high earth-rockfill dams during earthquake[J].World Earthquake Engineering,2010,26(S1):341-345.(in Chinese)
[13]张宏洋,李同春,宫必宁,等.砂土的P-Z模型介绍及振动台试验验证[J].水力发电学报,2009,28(5):182-186,178.ZHANG Hong-yang,LI Tong-chun,GONG Bining,et al.Introduction and shaking table test verification of the P-Z model for sand soil[J].Journal of Hydroelectric Engineering,2009,28(5):182-186,178.(in Chinese)
[14]XU Bin,ZOU De-gao,LIU Hua-bei.Threedimensional simulation of the construction process of the Zipingpu concrete face rockfill dam based on a generalized plasticity model[J].Computers and Geotechnics,2012,43:143-154.
[15]周扬.汶川地震紫坪铺面板堆石坝震害分析及面板抗震对策研究[D].大连:大连理工大学,2012.ZHOU Yang.Study on the damages of Zipingpu concrete face rockfill dam during Wenchuan earthquake and aseismic measures for face slabs[D].Dalian:Dalian University of Technology,2012.(in Chinese)
[16]XU Ming,SONG Er-xiang,CHEN Jin-feng.A large triaxial investigation of the stress-pathdependent behavior of compacted rockfill[J].Acta Geotechnica,2012,7(3):167-175.
[17]曹光栩,徐明,宋二祥.土石混合料的力学特性[J].华南理工大学学报:自然科学版,2010,38(11):32-39.CAO Guang-xu,XU Ming,SONG Er-xiang.Mechanical properties of broken rock-soil mixture[J].Journal of South China University of Technology:Natural Science Edition,2010,38(11):32-39.(in Chinese)
[18]杨光,孙逊,于玉贞,等.不同应力路径下粗粒料力学特性试验研究[J].岩土力学,2010,31(4):1118-1122.YANG Guang,SUN Xun,YU Yu-zhen,et al.Experimental study of mechanical behavior of a coarse-grained material under various stress paths[J].Rock and Soil Mechanics,2010,31(4):1118-1122.(in Chinese)
[19]Kovacevic N,Potts D M,Vaughan P R.Recent advances in the numerical modelling of embankment dams[C]//Ensuring Reservoir Safety into the Future:Proceedings of the 15th Conference of the British Dam Society.London:Thomas Telford Services Ltd.,2008.
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