ISSN:0363-9061    

DOI:10.1002/nag.1610020302

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractAn anisotropic hardening model for soils is proposed by applying the concept of a field of hardening moduli developed previously for metals. Besides the yield surface, a set of nesting surfaces in the stress‐space specifies the variation of hardening moduli during the deformation process. Both drained and undrained soil behaviour can be treated and distortional as well as volumetric strain cycles can be considered. The model can be applied in studying soil behaviour under cyclic loading and in particular to describe densification or liquefaction phenomen

ISSN:0363-9061    

DOI:10.1002/nag.1610020303

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractThe finite element method, formulated for non‐linear heat conduction, allows the solution of practically any ground freezing problem. Stabilization of wet soils by artificial freezing and freezing under roads induced by cold winter conditions are considered in this paper.Special features of the program used include parabolic isoparametric elements, a new time stepping scheme and an improved procedure for the estimation of thermal propertie

ISSN:0363-9061    

DOI:10.1002/nag.1610020304

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractStability equations for a strain‐softening system are derived from expressions describing the energy variation in a variable stiffness stiff testing machine and a brittle rock specimen. A normal strain‐softening expression and a shear strain‐softening expression are derived to predict the stability of laboratory tests on brittle rocks, which through machine stiffness adjustment, exhibited critical stability in the strain‐softening range. From these comparisons it was found that the shear strain‐softening model gave consistently good results. The analytical and laboratory modelling indicates that strain‐softening in brittle geologic media is closely connected with joints, faults, and interfaces where shear distortions

ISSN:0363-9061    

DOI:10.1002/nag.1610020305

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractA continuum representation for soil which incorporates the concepts of hypoelasticity and critical state theory is proposed. General, three‐dimensional constitutive equations are formulated to relate specific volume, stress, rate of deformation and rate of change of stress, resulting in a mathematical material model which exhibits phenomenological features typical of soil response. The general constitutive equations are specialized to represent the particular cases of isotropic compression, constant, volume deformation, uniaxial compression and biaxial deformation. Methods are suggested for determining the model parameters to represent a specific soil using conventional triaxial test data. Comparisons of stress‐strain response with published experimental data are sh

ISSN:0363-9061    

DOI:10.1002/nag.1610020306

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractThe effects and simulation of driving of structures (piles) into saturated soil media are discussed, and procedures for numerical simulation of driving are proposed. Consolidation caused by changes in stresses and in pore water pressures in the soil mass due to the driving is solved by using a finite element procedure. The changes in stresses and pore water pressures due to driving are obtained on the basis of the cavity expansion approach, and are introduced in the finite element procedure as initial conditions. Stresses and deformations around a pile as consolidation proceeds are plotted and related to the quantities such as a wall friction, and point and total loads relevant to analysis and design.

ISSN:0363-9061    

DOI:10.1002/nag.1610020307

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

摘要:

AbstractA finite‐difference scheme widely used in analysis of pile driving is examined, the scheme is shown to yield peculiar results in simple symmetric impact problems and to inherently posses an imprecise definition of energy balance. A modified difference scheme is suggested and comparisons of the two methods are show

ISSN:0363-9061    

DOI:10.1002/nag.1610020308

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610020309

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610020301

出版商:John Wiley&Sons, Ltd    

年代:1978

数据来源: WILEY