By Annamaria Cividini (eds.)
The NUMGE98 convention introduced jointly senior and younger researchers, scientists and working towards engineers from eu and in another country nations, to percentage their wisdom and event at the a number of features of the research of Geotechnical difficulties via Numerical tools. The papers handle a wide spectrum of geotechnical difficulties, together with tunnels and underground openings, shallow and deep foundations, slope balance, seepage and consolidation, in part saturated soils, geothermal results, constitutive modelling, etc.
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Additional info for Application of Numerical Methods to Geotechnical Problems: Proceedings of the Fourth European Conference on Numerical Methods in Geotechnical Engineering Numge98 udine, Italy October 14–16, 1998
The profile of the preconsolidation pressure of Haarajoki is typical for the Finnish clay layers. The upper clay layer, dry crust, is heavily overconsolidated. Under the dry crust the pre-consolidation pressure is diminishing towards the minimum value. In deeper layers the pre-consolidation pressure profile is similar to the overburden pressure profile. The value of the Poisson's ratio is commonly determined from the results of drained triaxial tests. In the calculation program PLAXIS it is necessary to use the real elastic value of the Poisson's ratio.
In the author's implementation MINRES uses somewhat more memory for vectors - 12 @ NEQ-long vectors compared with CG's 9. Q matrix arises from non-associated elastoplasticity. In such cases, as explained by Greenbaum (1997) for example, error minimisation is much more complicated than it was for symmetric systems. It can be shown that in exact arithmetic the CG and MINRES algorithms lead to an optimal approximation in order (NEQ) operations in addition to the matrix-vector multiplication with no additional storage of intermediate approximation vectors.
The thinner lines (solid and dashed) in the preconsolidation stress-curve represent the vertical preconsolidation stress state in the PLAXIS calculations (OCR I POP). It can be seen from the three upper soil layers that there are difficulties to describe real preconsolidation stress state by using the POP or the OCR when cr' P decreases with depth. The use of OCR I POP requires the curves of cr' vo- and cr' P to be parallel. To get as close as possible to the real value of cr' P either OCR or POP has been chosen at every layer.
Application of Numerical Methods to Geotechnical Problems: Proceedings of the Fourth European Conference on Numerical Methods in Geotechnical Engineering Numge98 udine, Italy October 14–16, 1998 by Annamaria Cividini (eds.)