Artículos Técnicos

Use of a Finite Element Code to Model Complex Mine Water Problems

Abstract:

Numerical models are now used routinely to predict ground-water inflows to both surface and underground mines and to help design dewatering systems. Two of the more complex problems encountered in mine dewatering are 1) predicting the configuration of the phreatic surface and height of the seepage face in pit highwalls for slope stability analysis and 2) predicting inflow to underground mines, particularly from discrete geologic structures and under non-Darcian flow. Frustrated by the limitations of the most common ground-water flow codes in dealing with these problems, we have developed a 3-dimensional, finite element code, designated MINEDW, that has been specially designed to address the relatively unique hydrologic complexities of mining.

MINEDW includes subroutines to calculate the height of the seepage face in a pit wall, to simulate faults without adding more discretization, and to simulate non-Darcian flow and the transition to Darcian flow as heads and gradients decrease. Examples of MINDEW solutions to relatively idealized problems are given and compared to those from physical models, analytical solutions, and another numerical code (MODFLOW).

MINEDW has been applied to a large mining operation in Indonesia involving dewatering of both a large pit and underground drifts. This case has been made even more challenging by karstic features and very high, but variable (particularly as demonstrated by a recent El Niño-induced drought) precipitation. How the hydrogeology was conceptualized and incorporated into the numerical model, how the mine plans and variable precipitation were simulated, and the results of the calibration and predictive simulations are described.

Citation:

Azrag, E., V.I. Ugorets, and L.C. Atkinson. 1998. Use of a finite element code to model complex mine water problems. Proceedings of Symposium on Mine Water and Environmental Impacts, International Mine Water Association, Johannesburg, South Africa, 1 September: pp. 31-41.

Authors:

Houmao Liu

Jianwei Xiang

Link to Full Text:

Addressing Complex Mine-Water Problems.pdf

Últimas noticias
  • Publicamos los artículos aceptados para el Simposio Itasca 2020 en Viena. Se recibieron más de 100 artículos para el Quinto Simposio Internacional de Itasca, que se...
    Leer mas
  • Itasca Chile Abre Proceso de Postulación a Prácticas Se abre el proceso de postulación a prácticas verano 2020, se invita a postular a...
    Leer mas
  • Quinto Simposio Internacional de Itasca - Inscripciones Abiertas ...
    Leer mas

Próximos Eventos
26 nov.
FLAC3D V7.0 Training Course November 2019
FLAC3D TMis a numerical modeling code for advanced geotechnical analysis of soil, rock, and structural support in three dimensions. FLA... Leer mas
17 feb.
Itasca Symposium 2020
The Fifth International Itasca Symposium will be held at the University of Vienna (Austria). The Symposium will features the applicatio... Leer mas
9 mar.
FLAC 8.0 Introductory Training Minneapolis 2019
... Leer mas