A DETERMINATION PROCEDURE OF INPUT PARAMETERS IN ELASTO-VISCOPLASTIC FINITE ELEMENT ANALYSIS
キーワード:
(input soil parameters)___-
1987 年 27 巻 3 号 p. 71-87
詳細
1987 年 27 巻 3 号 p. 71-87
The use of numerical methods such as finite element or boundary element methods in analyzing the behaviour of subsoil foundation during construction works has given geotechnical engineers the impression that the determination of material parameters was poorly backgrounded by sufficient experiences and consequent confidence of the engineers themselves.The determination of input parameters is of practical value only when it is employed as a part of total system consisting of governing equations for the total and the effective stresses and strains, constitutive equations describing the behaviour of soil and modelling of soil mass constrained by boundary and initial conditions.A parameter determination procedure should be verified through a number of comparisons between the field performance of in-situ subsoils and the computed results over a wide variety of soils and boundary/initial conditions.In this paper, the determination procedure of input parameters to be used in an elasto-viscoplastic finite element computation is proposed.After a brief introduction of the mathematical structure of this finite element, the determination procedure of material parameters is confirmed by the authors' experiences of analyzing the behaviour of subsoil foundations.Next the appropriateness of input parameters determined by proposed procedure is verified by comparing with a lot of laboratory test results.Finally some examples of applying the proposed procedure are shown and it is confirmed that the computational results well agree with the measured behaviour of in-situ soil.
