滨海相软土延拓邓肯–张模型的数值模拟研究

doi:10.13722/j.cnki.jrme.2014.s2.110

摘要
图/表
参考文献(17)
相关文章 (0)

全文: PDF (5824 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要引入控敛因子θ，提出能克服邓肯–张模型数学缺陷的延拓模型，证明邓肯–张模型是延拓模型在θ = 2时的特例，并揭示延拓模型更适用于模拟具有强烈非线性变形行为的滨海相软土。基于传统的邓肯–张模型和新建的延拓模型，采用C++语言编制二维有限元程序，对滨海相软土常规三轴压缩试验进行数值模拟研究。研究结果表明：当初始切线模量和极限偏应力为定值时，控敛因子与延拓模型曲线的收敛速度呈负相关；延拓模型可通过改变控敛因子来模拟收敛速度大于或小于邓肯–张模型的应力–应变曲线；在轴向应变相同的情况下，减小控敛因子，会导致试样各单元的轴向应力值和中部单元的径向应变值增大，试样部分单元最小安全系数减小；同一围压下，控敛因子与体积应变呈负相关；围压越大，控敛因子对体积应变的影响也越大。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	俞缙1
	2
	李天斌2
	郑春婷1
	蔡燕燕1
	3
	涂兵雄1
	穆康1

关键词 ：土力学；控敛因子；邓肯&ndash, 张模型；延拓模型；滨海相软土；数值模拟

Abstract：The control convergence factor θ was introduced to propose a prolongation model which could avoid the mathematical defect of Duncan-Chang model. It is proved that the Duncan-Chang model is one exception of prolongation model with the value of θ equal to 2. The prolongation model is revealed to be more suitable for simulating seashore soft soil which has strong nonlinear deformational behavior. A two-dimensional finite element program was presented using the C++ language based on the traditional Duncan-Chang model and the new prolongation model. Conventional triaxial compression tests of seashore soft soil were carried out using the new program. The results show that，θ is negatively correlated with the convergence rate of prolongation model curve when the initial tangential modulus and limit deviatoric stress were set. By changing the value of θ，the stress-strain curve with the convergence rate greater or less than that obtained from Duncan-Chang model can be derived from the prolongation model. With the same axial strain，the axial stresses of the whole specimen and the radial strains of the central units would increase with the reduce of the control convergence factor. So the minimal safety factor of the sample units would reduce. Under the same confining pressure，the control convergence factor was negatively correlated with the volume strain change. For the same volume strain，the larger the confining pressure，the more significant influence the control convergence factor would be.

Key words： soil mechanics control convergence factor Duncan-Chang model prolongation model seashore soft soil numerical simulation

引用本文:

俞缙1，2，李天斌2，郑春婷1，蔡燕燕1，3，涂兵雄1，穆康1. 滨海相软土延拓邓肯–张模型的数值模拟研究[J]. 岩石力学与工程学报, 2014, 33(S2): 4271-4281.
YU Jin1，2，LI Tianbin2，ZHENG Chunting1，CAI Yanyan1，3，TU Bingxiong1，MU Kang1. NUMERICAL SIMULATION RESEARCH ON PROLONGATION DUNCAN-CHANG MODEL FOR SEASHORE SOFT SOIL. , 2014, 33(S2): 4271-4281.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.110 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/4271

[1]	王常明，王清，张淑华. 滨海软土蠕变特性及蠕变模型[J]. 岩石力学与工程学报，2004，23(2)：227-230.(WANGChangming，WANGQing，ZHANGShuhua. Creep characteristics and creep model of marine soft soils[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(2)：227-230.(in Chinese))
[2]	姜民，边学成，吴建国，等. 海堤荷载下海积软土沉降的现场测试和数值模拟[J]. 岩石力学与工程学报，2010，29(5)：1 060-1 067. (JIANGMin，BIANXuecheng，WUJianguo，et al.Field measurement and numerical simulation of estuarine deposit settlements under embankment loads[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(5)：1 060-1 067.(in Chinese))
[3]	殷德顺，王保田. 负乘幂本构模型的切线模量[J]. 岩土力学，2009，30(7)：2168-2173.(YIN Deshun，WANG Baotian. Tangent modulus of negative-power constitutive model[J]. Rock and Soil Mechanics，2009，30(7)：2168-2173.(in Chinese))
[4]	陈云敏，高登，朱斌. 城市固体废弃物的复合指数应力-应变模型及其应用[J]. 岩土工程学报，2009，31(7)：1020-1029.(CHEN Yunmin，GAO Deng，ZHU Bin. Composite exponential stress-strain model of municipal solid waste and its application[J]. Chinese Journal of Geotechnical Engineering，2009，31(7)：1020-1029.(in Chinese))
[5]	李广信. 关于土的本构模型研究的若干问题[J]. 岩土工程学报，2009，31(10)：1636-1641.(LI Guangxin. Someproblems in researcheson constitutive model of soil[J].Chinese Journal of Geotechnical Engineering，2009，31(10)：1636-1641.(in Chinese))
[6]	DUNCAN J M，CHANG C Y. Nonlinear analysis of stress and strain in soils[J]. Journal of the Soil Mechanics and Foundation Division，1970，96(5)：1629-1 653.
[7]	DUNCAN J M，BYME P M，WONG K S. Strength，stress-strain and bulk modulus parameters for finite element analysis of stress and movements in soil masses[R]. Berkeley，USA：Department of Civil Engineeringof University of California，1980.
[8]	王伟，卢廷浩. 滨海软土动孔压发展模型核心函数研究[J]. 自然灾害学报，2009，18(5)：192-196.(WANG Wei，LU Tinghao. Study on core function for dynamic pore water pressure developing process model of seashore soft soil[J]. Journal of Natural Disasters，2009，18(5)：192-196.(in Chinese))
[9]	王元战，王婷婷，王军. 滨海软土非线性流变模型及其工程应用研究[J]. 岩土力学，2009，30(9)：2679-2685.(WANG Yuanzhan，WANG Tingting，WANG Jun. A nonlinear rheological model of soft clay and its application to Tianjin littoral area[J]. Rock and Soil Mechanics，2009，30(9)：2679-2685.(in Chinese))
[10]	王伟，宋新江，凌华，等. 滨海相软土应力-应变曲线复合指数-双曲线模型[J]. 岩土工程学报，2010，32(9)：1455-1459.(WANGWei，SONG Xinjiang，LING Hua，et al. Composite exponential-hyperbolic model for stress-strain curve of seashore soft soil[J]. Chinese Journal of Geotechnical Engineering，2010，32(9)：1455-1459.(in Chinese))
[11]	钱家欢，殷宗泽. 土工原理与计算[M]. 北京：中国水利水电出版社，1995：54-58.(QIANJiahuan，YINZongze. The earthwork principle and calculation[M]. Beijing：China WaterPower Press，1995：54-58.(in Chinese))
[12]	罗汀，姚仰平，侯伟. 土的本构关系[M]. 北京：人民交通出版社，2010：187-188.(LUO Ting，YAOYangping，HOU Wei. Soil constitutivemodels[M]. Beijing：China Communications Press，2010：187-188.(in Chinese))
[13]	王伟，卢廷浩，周干武. 黏土非线性模型的改进切线模量[J]. 岩土工程学报，2007，29(3)：458-462.(WANG Wei，LU Tinghao，ZHOU Ganwu. Improved tangent modulus of nonlinear soil model[J]. Chinese Journal of Geotechnical Engineering，2007，29(3)：458-462.(in Chinese))
[14]	董建国，陈祥达，袁聚云. 上海黏性土剪切带形成的数值模拟分析[J]. 岩土力学，2007，28(增1)：263-266.(DONG Jianguo，CHEN Xiangda，YUAN Juyun. Numerical simulation research on the formation of shear bands in Shanghai clay[J]. Rock and Soil Mechanics，2007，28(Supp.1)：263-266.(in Chinese))
[15]	蒋刚，李苏春. 南京粉土与粉质黏土的剪切带三轴试验与性状分析[J]. 南京工业大学学报：自然科学版，2008，30(5)：8-11.(JIANG Gang，LI Suchun. Performance analysis on shear band under triaxial test of silt and silty clay in Nanjing[J]. Journal of Nanjing University of Technology：Natural Science，2008，30(5)：8-11.(in Chinese))
[16]	李广信. 高等土力学[M]. 北京：清华大学出版社，2004：114-116.(Li Guangxin.Advanced soil mechanics[M]. Beijing：Tsinghua University Press，2004：114-116.(in Chinese))
[17]	樊赟赟，王思敬，王恩志，等. 岩土材料剪切破坏点安全系数的研究[J]. 岩土力学，2009，30(增2)：200-203.(FAN Yunyun，WANG Sijing，WANG Enzhi，et al. Research on point safety factor of shear failure geomaterials[J]. Rock and Soil Mechanics，2009，30(Supp.2)：200-203.(in Chinese))