考虑各向异性的软黏土扰动状态本构模型
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摘要
以大量试验结果为依据,运用物理意义明确、获取简便快捷、经济实用的土电阻率结构指标进行软黏土扰动变量的表征和测定。以三轴试验与电阻率测试结果为基础,进行了扰动函数的构建。在软黏土扰动状态描述中,引入旋转硬化因子,用以考虑应力诱发各向异性,进而构建了考虑各向异性的软黏土扰动状态概念本构模型。模型从一定程度上克服了传统扰动变量获取方法的弊端,克服了传统借用数学演绎手段建立扰动函数的不足,提高了模型应用的适用性。在模型构建中,融入初始应力各向异性的影响,从而使模型能更好地反映软土实际工程情况。三轴排水剪切试验验证结果表明,该模型可较好反映软黏土受荷下的结构变化情况和受力特性。
Based on tests, electrical resistivity indexes are taken to reflect the changes in soil structures and define the disturbed variable, which is convenient, continuous, economical and practicable. Meanwhile, disturbed function is built by the results of undrained triaxial shear tests and electrical resistivity tests. Additionally, rotational hardening parameter is taken to describe disturbed state of natural soft clays; accordingly, a disturbed state concept constitutive model taking into account stress-induced anisotropy for soft clays is presented. As a result, the traditional methods measuring disturbed variable and establishing disturbed function may be optimized, and the applicability and accuracy of model may be improved. Results from undrained triaxial shear tests show that the model can describe the stress-strain characteristics fairly well and could be applied to practice.
Based on tests, electrical resistivity indexes are taken to reflect the changes in soil structures and define the disturbed variable, which is convenient, continuous, economical and practicable. Meanwhile, disturbed function is built by the results of undrained triaxial shear tests and electrical resistivity tests. Additionally, rotational hardening parameter is taken to describe disturbed state of natural soft clays; accordingly, a disturbed state concept constitutive model taking into account stress-induced anisotropy for soft clays is presented. As a result, the traditional methods measuring disturbed variable and establishing disturbed function may be optimized, and the applicability and accuracy of model may be improved. Results from undrained triaxial shear tests show that the model can describe the stress-strain characteristics fairly well and could be applied to practice.
引文
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[18]于小军,刘松玉.电阻率指标在膨胀土结构研究中应用探讨[J].岩土工程学报,2004,26(3):393-396.YU Xiao-jun,LIU Song-yu.Researches on application of electrical resistivity indices to the microstructure of expansive soils[J].Chinese Journal of Geotechnical Engineerng,2004,26(3):393-396.
[19]于小军.电阻率结构模型理论的土力学应用研究[博士学位论文D].南京:东南大学,2004.
[20]WHEELER S J,N??T?NEN A,KARSTUNEN M,et al.An anisotropic elastoplastic model for soft clays[J].Canadian Geotechnical Journal,2003,40:403-418.
[21]DESAI C S.Constitutive modeling using the disturbed state concept as microstructure self-adjustment concept[C]//Continuum Models of Materials with Microstructure,Chapter8.[S.l.]:Wiley,1995.
[22]魏星,黄茂松.软土初始应力各向异性弹塑性模型[J].岩土力学,2004,25(增刊):43-46.WEI Xing,HUANG Mao-song.An elastoplastic model for soft clays with initially stress-induced anisotropy[J].Rock and Soil Mechanics,2004,25(Supp.2):43-46.
[23]NAKANO M,NAKAI K,NODA T,et al.Simulation of shear and one-dimentional compression behabior of naturally deposited clays by super/subloading yield surface Cam-clay model[J].Soils and Foundations,2005,45(1):141-151.
[24]王立忠,叶盛华,沈恺伦,等.K0固结软黏土不排水抗剪强度[J].岩土工程学报,2006,28(8):970-977.WANG Li-zhong,YE Sheng-hua,SHEN Kai-lun,et al.Undrained shear strength of K0consolidated soft clays[J].Chinese Journal of Geotechnical Engineerng,2006,28(8):970-977.
[2]CASAGRANDE A.The determination of the preconsolidation load and its practical significance[C]//Proceedings of1st ICSMFE.[S.l.]:[s.n.].1936,3:60-84.
[3]SCHMERTMANN J H.The undisturbed consolidation behavior of clay[J].Transport,ASCE,1955,120:1201-1227.
[4]吴刚.工程材料的扰动状态本构模型(I)——扰动状态概念及其理论基础[J].岩石力学与工程学报,2002,21(6):759-765.WU Gang.Disturbed state constitution models of engineering material(I)—disturbed state concept and its theory principium[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(6):759-765.
[5]孙钧,周健,龚晓楠,等.受施工扰动影响土体环境稳定理论与变形控制[J].同济大学学报(自然科学版),2004,32(10):1261-1269.SUN Jun,ZHOU Jian,GONG Xiao-nan,et al.Theory of soil environment stability and deformation control under influence of construction disturbance[J].Journal of Tongji University(Natural Science),2004,32(10):1261-1269.
[6]王军,高玉峰.扰动结构性软土地基的沉降特性分析[J].岩土力学,2006,27(8):1384-1388.WANG Jun,GAO Yu-feng.Settlement characteristics analysis of disturbed structure soft clay ground[J].Rock and Soil Mechanics,2006,27(8):1384-1388.
[7]王立忠,李玲玲.结构性土体的施工扰动及其对沉降的影响[J].岩土工程学报,2007,29(5):693-704.WANG Li-zhong,LI Ling-ling.Field disturbance of structured clay and its effect on settlements of soil foundation[J].Chinese Journal of Geotechnical Engineerng,2007,29(5):693-704.
[8]王国欣,肖树芳,黄宏伟,等.基于扰动状态概念的结构性黏土本构模型研究[J].固体力学学报,2004,25(2):191-197.WANG Guo-xin,XIAO Shu-fang,HUANG Hong-wei,et al.Study of constitutive model of structural clay based on the disturbed state concept[J].Acta Mechnica SolidaSinica,2004,25(2):191-197.
[9]周成,沈珠江,陈生水,等.结构性土的次塑性扰动状态模型[J].岩土工程学报,2004,26(4):435-439.ZHOU Cheng,SHEN Zhu-jiang,CHEN Sheng-shui,et al.A hypoplasticity disturbed state model for structured soils[J].Chinese Journal of Geotechnical Engineerng,2004,26(4):435-439.
[10]张玉洁,王常明,王芳,等.黏性土基于扰动状态概念的应力-应变关系及压缩变形分析[J].世界地质,2005,24(2):200-202.ZHANG Yu-jie,WANG Chang-ming,WANG Fang,et al.Stress-strain relationship and analysis of compressive deformation of cohesive soil based on DSC[J].Global Geology,2005,24(2):200-202.
[11]陈锦剑,吴刚,王建华,等.基于扰动状态概念模型的饱和软黏土力学特性[J].上海交通大学学报,2004,38(6):952-955.CHEN Jin-jian,WU Gang,WANG Jian-hua,et al.Disturbed state concept model for studying on mechanical characteristics of saturated cohesive soils[J].Journal of Shanghai Jiaotong University,2004,38(6):952-955.
[12]迟世春,相彪.基于损伤扰动的土体本构关系研究[J].世界地震工程,2007,23(2):139-144.CHI Shi-chun,XIANG Biao.A soil constitutive model based on disturbed state concept[J].World Eatthquake Engineering,2007,23(2):139-144.
[13]SAMOUELIAN A B I.COUSIN A A,TABBAGH C A,et al.Electrical resistivity survey in soil science:a review[J].Soil and Tillage Research,2005,83(2):173-193.
[14]THEVANAYAGAM S.Electrical response of two-phase soil:Theory and applications[J].Journal of Geotechnical Engineering,1993,119:1250-1275.
[15]TABBAGH A,DABAS M,HESSE A,et al.Soil resistivity:a non-invasive tool to map soil structure horizonation[J].Geoderma,2000,97,393-404.
[16]SAMOUELIAN A,COUSIN I,RICHARD G.et al.Electrical resistivity imaging for detecting soil cracking at the centimetric scale[J].Soil Sci.Soc.J.Am.,2003,67:1319-1326.
[17]查甫生,刘松玉,杜延军,等.基于电阻率法的膨胀土吸水膨胀过程中结构变化定量研究[J].岩土工程学报,2008,30(12):1832-1839.ZHA Fu-sheng,LIU Song-yu,DU Yan-jun,et al.Quantitative research on micro-structures of expansive soils during swelling using electrical resistivity measurements[J].Chinese Journal of Geotechnical Engineerng,2008,30(12):1832-1839.
[18]于小军,刘松玉.电阻率指标在膨胀土结构研究中应用探讨[J].岩土工程学报,2004,26(3):393-396.YU Xiao-jun,LIU Song-yu.Researches on application of electrical resistivity indices to the microstructure of expansive soils[J].Chinese Journal of Geotechnical Engineerng,2004,26(3):393-396.
[19]于小军.电阻率结构模型理论的土力学应用研究[博士学位论文D].南京:东南大学,2004.
[20]WHEELER S J,N??T?NEN A,KARSTUNEN M,et al.An anisotropic elastoplastic model for soft clays[J].Canadian Geotechnical Journal,2003,40:403-418.
[21]DESAI C S.Constitutive modeling using the disturbed state concept as microstructure self-adjustment concept[C]//Continuum Models of Materials with Microstructure,Chapter8.[S.l.]:Wiley,1995.
[22]魏星,黄茂松.软土初始应力各向异性弹塑性模型[J].岩土力学,2004,25(增刊):43-46.WEI Xing,HUANG Mao-song.An elastoplastic model for soft clays with initially stress-induced anisotropy[J].Rock and Soil Mechanics,2004,25(Supp.2):43-46.
[23]NAKANO M,NAKAI K,NODA T,et al.Simulation of shear and one-dimentional compression behabior of naturally deposited clays by super/subloading yield surface Cam-clay model[J].Soils and Foundations,2005,45(1):141-151.
[24]王立忠,叶盛华,沈恺伦,等.K0固结软黏土不排水抗剪强度[J].岩土工程学报,2006,28(8):970-977.WANG Li-zhong,YE Sheng-hua,SHEN Kai-lun,et al.Undrained shear strength of K0consolidated soft clays[J].Chinese Journal of Geotechnical Engineerng,2006,28(8):970-977.
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