排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
STRUCTURAL DAMAGE MODEL OF UNSATURATED EXPANSIVE SOIL AND ITS APPLICATION IN MULTI-FIELD COUPLE ANALYSIS ON EXPANSIVE SOIL SLOPE 总被引:1,自引:0,他引:1
Focused on the sensitivity to climate change and the special mechanical characteristics of undisturbed expansive soil, an elastc-plastic damage constitutive model was proposed based on the mechanics of unsaturated soil and the mechanics of damage. Undisturbed expansive soil was considered as a compound of non-damaged part and damaged part. The behavior of the non-damaged part was described using non-linear constitutive model of unsaturated soil. The property of the damaged part was described using a damage evolution equation and two yield surfaces, i.e., loading yield (LY) and shear yield (SY). Furthermore, a consolidation model for unsaturated undisturbed expansive soil was established and a FEM program named UESEPDC was designed. Numerical analysis on solid-liquid-gas tri-phases and multi-field couple problem was conducted for four stages and fields of stress, displacement, pore water pressure, pore air pressure, water content, suction, and the damage region as well as plastic region in an expansive soil slope were obtained. 相似文献
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Unsaturated soil is a three-phase media and is composed of soil grain,water andgas.In this paper,the consolidation problem of unsaturated soil is investigated basedon the theory of mixture.A theoretical formula of effective stress on anisotropicporous media and unsaturated soil is derived.The principle of effective stress and theprinciple of Curie symmetry are taken as two fundamental constitutive principles ofunsaturated soil.A mathematical model of consolidation of unsaturated soil isproposed,which consists of25 partial differenfial equations with25 unknowns.Withthe help of increament linearizing method,the model is reduced to5 governingequations with5 unknowns,i.e.,the three displacement components of solid phase,thepore water pressure and the pore gas pressure.7 material parameters are involved inthe model and all of them can be measured using soil tests.It is convenient to use themodel to engineering practice.The well known Biot’s theory is a special case of themodel. 相似文献
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基于混合物理论的非饱和土的热-水-力耦合分析模型Ⅰ 总被引:3,自引:2,他引:1
以混合物理论为基础研究了非饱和土的热-水-力多场耦合问题.将非饱和土视为由土骨架、液态水、水蒸气、干燥气体及溶解气体共5种组分构成的混合物,在组分的质量、动量守恒方程及整体能量守恒方程的基础上,引入了37个补充方程以形成封闭方程组.其中,利用水与水蒸气的化学势改变量相同,推导了在气压力变化条件下水与水蒸气相变平衡所满足的限制方程.最终控制方程以增量形式给出,6个方程求解6个未知量(3个土骨架位移、水压力、气压力及温度),充分反映了热膨胀、热渗流、水的相变、气体溶解及土骨架变形等多种现象的耦合过程. 相似文献
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非饱和土固结的混合物理论(Ⅰ) 总被引:22,自引:6,他引:16
非饱和土是由土粒、水、气组成的三相介质,本以混合物理论为基础研究了非饱和土的固结问题。中导出了各向异性多孔介质及非饱和土 的有效应力的理论公式,把有效应力原理和Curie对称原理作为非饱和土的两个重要的本构原理,建立了非饱和 土固结的数学模型:由25个方程求解25个未知量。在增量线性化的情况下,本模型简化为5个控制方程求解5个未知量:3个固相位移、孔隙水压力和孔隙气压力。模型中包含7个材料参数,都可由试验测定,便于工程应用,Biot理论是本模型的特例。 相似文献
7.
用解析法推导莫尔-库伦准则 总被引:1,自引:0,他引:1
莫尔-库伦准则是岩土材料的破坏准则,也称为极限平衡条件。当土中一点的应力状态满足极限平衡条件时,该点的土就濒于破坏。在土力学教材和文献由,大都是借助于莫尔园和库伦强度线从几何关系推导这一准则的。崔托维奇教授和吴天行教授分别给出了推导该准则的解析方法,但前者推导较烦,后者则须... 相似文献
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An Axionatics of Geomechanics 总被引:3,自引:0,他引:3
陈正汉 《应用数学和力学(英文版)》1994,15(10):953-964
ANAXIOMATICSOFGEOMECHANICSChenZheng-han(陈正汉)(LagislicalEngineeringUniversity,Chongqing)(ReceivedFeb.21.1994;CommunicatedbyJia... 相似文献
9.
关于土力学理论模型与科研方法的思考 总被引:4,自引:0,他引:4
为了提高研究生的理论水平和科研创新能力,在研究生教育中加强了理论模型和科研方法方
面的素质教育,结合笔者多年从事岩土力学与工程的教学与科研的经验,对理论模型的定义、
作用、结构,建模的原则、方法、过程、关键及修正方法,理论模型的评价标准等做了系统
的阐述,并针对岩土力学创新研究提出了10点意见. 相似文献
10.
陈正汉 《应用数学和力学(英文版)》1993,14(8):721-733
The present paper uses the mathematics model for consolidation of unsaturatedsoil developed in ref.[1]to solve boundary value problems.The analytical solutionsfor one-dimensional consolidation problem are gained by making use of Laplacetransform and finite Fourier transform.The displacement and the pore water pressureas well as the pore gas pressure are found from governing equations simultaneously.The theoretical formulae of coefficient and degree of consolidation are also given inthe paper.With the help of the method of Galerkin Weighted Residuals,the finiteelement equations for two-dimensional consolidation problem are derived.A FORTRANprogram named CSU8 using8-node isoparameter element is designed.A plane strainconsolidation problem is solved using the program,and some distinguishing features onconsolidation of unsaturated soil and certain peculiarities on numerical analysis arerevealed.These achievements make it convenient to apply the theory proposed by theauthor in engineering practice. 相似文献