Parameter identification for lined tunnels in a viscoplastic medium
作者： B. Lecampion , A. Constantinescu , D. Nguyen Minh
DOI: 10.1002/NAG.241
关键词: Estimation theory 、 Calculus 、 White noise 、 Viscoplasticity 、 Sensitivity (control systems) 、 Finite element method 、 Applied mathematics 、 Constitutive equation 、 Inverse problem 、 Computer simulation 、 Engineering
摘要: This paper is dedicated to the identification of constitutive parameters elasto-viscoplastic law from measurements performed on deep underground cavities (typically tunnels). inverse problem solved by minimization a cost functional least-squares type. The exact gradient computed direct differentiation method and descent done using Levenberg–Marquardt algorithm. presented for lined or unlined structures applied an elastoviscoplastic Perzyna class. Several problems are in one two dimensions different tunnel geometries. used have been obtained preliminary numerical simulation perturbed with white noise. identified responses match measurements. We also discuss usage sensitivity analysis system, provided method, optimization situ monitoring. distribution space time assess location points as well observation needed reliable identification. Copyright © 2002 John Wiley & Sons, Ltd.
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