Modelling of the elastoplastic behaviour of the bio-cemented soils using an extended Modified Cam Clay model  

作　　者：Xuerui Wang Christian B.Silbermann Thomas Nagel Udo Nackenhorst 

机构地区：[1]Institute of Mechanics and Computational Mechanics,Leibniz Universität,Hannover,Appelstr.9a,Hannover,30167,Germany [2]Gesellschaft für Anlagen-und Reaktorsicherheit(GRS)gGmbH,Theodor-Heuss-Straße 4,Braunschweig,38122,Germany [3]Geotechnical Institute,Technische Universität Bergakademie,Freiberg,Gustav-Zeuner-Str.1,Freiberg,09599,Germany

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第6期2184-2197,共14页岩石力学与岩土工程学报（英文版）

基　　金：funded by the German Research Foundation(DFG)(Grant No.NA 330/20e1).

摘　　要：An elastoplastic constitutive model based on the Modified Cam Clay(MCC)model is developed to describe the mechanical behaviour of soils cemented via microbially induced calcite precipitation(MICP).It considers the increase of the elastic stiffness,the change of the yield surface due to MICP cementation and the degradation of calcium carbonate bonds during shearing.Specifically,to capture the typical contraction-dilation transition in MICP soils,the original volumetric hardening rule in the MCC model is modified to a combined deviatoric and volumetric hardening rule.The model could reproduce a series of drained triaxial tests on MICP-treated soils with different calcium carbonate contents.Further,we carry out a parametric study and observe numerical instability in some cases.In combination with an analytical analysis,our numerical modelling has identified the benefits and limitations of using MCCbased models in the simulation of MICP-cemented soils,leading to suggestions for further model development.

关 键 词：Microbially induced calcite precipitation(MICP) Elastoplasticity Modified cam clay(MCC) OPENGEOSYS MFront Contraction-dilation transition 

分 类 号：TU753[建筑科学—建筑技术科学]