A family of constitutive models implemented in PLAXIS to simulate cemented mine backfill

Author(s): 
Alejo Sfriso
Date: 
Wednesday, November 20, 2019
First presented: 
XVI Panamerican Conference on Soil Mechanics and Geotechnical Engineering, Cancún (Mexico)
Type: 
Published paper
Category: 
Geotechnical

A family of constitutive models for mine cemented backfill is presented. Four formulas for the density- and pressure-dependency of elastic moduli, five formulas for the density and pressure-dependency of friction angle and four formulas for the age-dependency of the elastic moduli and effective cohesion are incorporated into an isotropic hypoelasticity with Mohr-Coulomb perfect plasticity framework and implemented in PLAXIS as a user-defined material model. This family includes the standard Mohr-Coulomb, Bolton, Leps, Barton and HoekBrown models as trivial cases when both nonlinear elasticity and age-dependency are switched off. In this paper, the formulation of the models is introduced, the basis of the numerical implementation is outlined, and a case history of the application to the cemented backfill of a sublevel stoping mine is presented as an example.
 

 

Feature Author

Mauro Sottile

Mauro is a Civil Engineer from the Northeast National University (Argentina) and MSc. from the Massachusetts Institute of Technology (MIT). He has focused on the development of constitutive soil models and their implementation in commercial software such as Abaqus and Plaxis. He has knowledge on the implementation, calibration and use of constitutive soil models for the application of numerical methods in geotechnical design. Mauro also has experience in geotechnical laboratory and in-situ tests and recently participated in projects located in Argentina, Armenia, Australia, Bolivia and South Africa. Within his regular activities he collaborates as a teacher at the University of Buenos Aires, Argentina.

Senior Consultant
MSc in Geotechnical Engineering
SRK Buenos Aires
Nicolás Agustín Labanda

Nicolás A. Labanda is a Consultant in SRK´s Buenos Aires office, with eight years of industry and academic experience. He has experience in design of concrete and steel structures for cement industry according to Argentinian, USA and Peruvian codes and standards. His experience includes collapse analysis of structures manufactured with plain and steel fiber reinforced concrete under blast loads, using the finite element method. The activities as SRK consultant includes numerical modeling in two and three dimensions of tunnels for the Buenos Aires metro (TBM, NATM, C&C), design of geotechnical structures and the development of mathematical models and computational codes for engineering applications. As part of his research activity, he has published in conferences and international journals in subjects concerning numerical and constitutive modeling, fracture and damage mechanics and structural analysis. He also collaborates as a teacher at the University of Buenos Aires, Argentina.

Senior Consultant
PhD, Civil Engineer
SRK Buenos Aires
Iñaki García Mendive

Iñaki García Mendive is a geotechnical engineer in SRK’s Buenos Aires office. His specialization focuses on the characterization of rock masses, application of empirical and numerical methods for design and validation in open pit and underground operations. He has experience in the design of geotechnical projects including foundations, anchor systems, embankments, slopes and excavations (OP and UG). He has participated in investigation projects at the Soil Mechanics Laboratory of the University of Buenos Aires. He collaborated as teaching assistant in the course of Strength of Materials.

Consultant
Geotechnical Engineer
SRK Buenos Aires
Osvaldo Ledesma

Osvaldo Nicolás Ledesma is a Senior Consultant at SRK´s Buenos Aires office, with experience in the design of foundations, excavations, tunnels, embankments and retaining structures for infrastructure and mining projects in Argentina, Peru, Paraguay, Uruguay, Canada and Papua New Guinea.  He has advanced knowledge of numerical methods for geotechnical structure design as well as experience in geotechnical field and laboratory testing. Osvaldo is currently pursuing a PhD in numerical modelling of soils in unsaturated conditions and serves as Assistant Professor of Soil Mechanics and Geology at the University of Buenos Aires.

Senior Consultant
Geotechnical Engineer
SRK Buenos Aires
Alejo Oscar Sfriso

Alejo O. Sfriso is a Principal Engineer with 25 years of experience in geotechnical engineering for infrastructure and mining works. He is an expert in the application of numerical methods for geotechnical design and analysis. In addition to his activity at SRK, he is the Director of AOSA - Geotechnical Laboratory, Professor of Soil Mechanics and Geology of the University of Buenos Aires, Vice President for South America of the International Society of Soil Mechanics and Geotechnical Engineering for the period 2017 - 2021, former Professor of Geotechnics at the National University of La Plata and former President of the Argentinean Society of Geotechnical Engineering.

Principal Consultant
PhD, Civil Engineer
SRK Buenos Aires
SRK Worldwide