<  Back to the Polytechnique Montréal portal

A black‐box automated approach to calibrate numerical simulations and optimize cover design: Application to a flow control layer constructed on an experimental waste rock pile

Tom Crouzal and Thomas Pabst

Article (2021)

[img]
Preview
Published Version
Terms of Use: Creative Commons Attribution Non-commercial No Derivatives .
Download (2MB)
Cite this document: Crouzal, T. & Pabst, T. (2021). A black‐box automated approach to calibrate numerical simulations and optimize cover design: Application to a flow control layer constructed on an experimental waste rock pile. Vadose Zone Journal, 20(3). doi:10.1002/vzj2.20130
Show abstract Hide abstract

Abstract

Mining operations often produce large volumes of waste rock to access economically valuable mineralized zones. Waste rock is usually stored in surface piles, the construction and reclamation of which represent a challenge for the industry. A flow control layer (FCL) made of crushed waste rock or sand and constructed on top of each waste rock bench could contribute to control water infiltration, thus improving waste rock pile stability and limiting contamination. An experimental waste rock pile was built and instrumented at the Tio mine (Rio Tinto Fer et Titane, Canada) to evaluate the performance of an FCL in field conditions. Large infiltration tests and rainfall monitoring were carried out, and measured outflow and water contents were used to calibrate numerical simulations. However, data were noisy and sometimes incomplete, and the models were difficult to calibrate. A new automated calibration approach was therefore proposed. An algorithm was developed to automate the numerical simulation calibration, using a black-box method that involves solving an optimization problem on a function without an analytic form. The approach was applied on measurements obtained from large-scale infiltration tests and validated using 2 yr of field monitoring data. Finally, the automated approach was adapted to optimize the design of the FCL, and an optimal design (material properties and layer thickness) was recommended based on local climate conditions. The proposed automated method could contribute to reduce the bias induced by manual calibration and allows for rapid multivariable calibration and optimization for a broad spectrum of mine waste cover system applications.

Open Access document in PolyPublie
Subjects: 1400 Génie minier et minéral > 1400 Génie minier et minéral
Department: Département des génies civil, géologique et des mines
Research Center: IRME - Institut de recherche en mines et environnement UQAT-Polytechnique
Funders: CRSNG/NSERC, Research Institute on Mines and Environment (RIME)
Date Deposited: 16 May 2022 16:46
Last Modified: 17 May 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/9254/
Document issued by the official publisher
Journal Title: Vadose Zone Journal (vol. 20, no. 3)
Publisher: Wiley
Official URL: https://doi.org/10.1002/vzj2.20130

Statistics

Total downloads

Downloads per month in the last year

Origin of downloads

Dimensions

Repository Staff Only