摘要:

AbstractA non‐linear optimization technique based on the quasi‐Newton approach is employed to back‐calculate certain model parameters of a simple, bounding surface, soil plasticity model fromin situpressuremeter data. The theoretical response corresponding to a given set of parameters is generated by finite element analysis. A semi‐analytical procedure is developed for the accurate and efficient evaluation of the gradient of objective function with respect to the model parameters of interest. The BFGS update is used to update the Hessian. Results of a series of numerical experimentation using artificial pressuremeter responses is first reported and discussed. A set of laboratory cavity expansion data is then used to calibrate the constitutiv

ISSN:0363-9061    

DOI:10.1002/nag.1610151202

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractA Fourier transform technique is presented which may be used to analyse three‐dimensional consolidation problems for soils which are loaded by embankment shaped loadings that are rectangular in plan (or of arbitrary shape which can be divided into rectangles in plan). The introduction of a Fourier transform effectively reduces the three‐dimensional problem to one involving only two spatial dimensions and this reduces computer storage and saves computing and data preparation time. The material properties of the soil may vary arbitrarily in the plane which is perpendicular to the axis associated with the variable eliminated during the Fourier transform. Solutions obtained using the method are compared with existing solutions in order to verify the theory and assess accuracy, and illustrative examples are given for problems involving the consolidation of soils under embankment loadi

ISSN:0363-9061    

DOI:10.1002/nag.1610151203

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

摘要:

AbstractThree‐dimensional elastoplastic analyses are increasingly feasible as computing power increases. Candidate finite elements for this work are 20‐node bricks. In elastoplastic situations, yielding creates ‘soft’ regions within a stiffer surrounding matrix and propagation of spurious modes is possible under reduced integration. In this paper, the intrinsic properties of the 20‐node brick are analysed, with a view to avoiding numerical complications in plasticity

ISSN:0363-9061    

DOI:10.1002/nag.1610151204

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610151205

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610151206

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY

ISSN:0363-9061    

DOI:10.1002/nag.1610151201

出版商:John Wiley&Sons, Ltd    

年代:1991

数据来源: WILEY