Artículos Técnicos

Simulation of Three-Dimensional Pore-Pressure Distribution for Slope-Stability Analysis

Abstract:

A 3D groundwater flow model was constructed using MINEDW [1] to simulate pore pressure at the Chuquicamata open pit mine slope in Chile. Three main factors required the implementation of a 3D model for the prediction of pore pressures: (1) discrete zones of recharge in the gravel zone lead to the non-uniform flow field; (2) the low-permeability west fault and shear zones maintain the non-hydrostatic pore-pressure distribution with depth during mining; and (3) the drainage gallery causes localized depressurization. In addition, a zone of relaxation (ZOR) was observed at the site. Simulations of the development of the ZOR according to the mining schedule are important in the prediction of pore-pressure distribution within the slope.

The model was calibrated against measured water levels, pore pressures, drains, and seepage rates. The calibrated model was then used to simulate and predict pore-pressure distribution in the pit walls for different time periods. Specifically, the model was able to capture the non-hydrostatic, transient nature of the pore pressures with depth in the granodiorite west of the shear zone, in the shear zone, and along the west fault. The model also simulated the ZOR for the first 150 m below the pit bench with enhanced hydraulic conductivity values according to the excavation schedule. Simulated transient 3D pore-pressure distribution provides a more realistic input to 3DEC slope-stability analyses.

Citation:

Liu, H., F. Duran del Valle, J. Xiang, and B. Șener Kaya. 2012. Simulation of three-dimensional pore-pressure distribution for slope-stability analysis. 46th US Rock Mechanics/Geomechanics Symposium, Chicago, IL, 24-27 June.

Authors:

Houmao Liu

Jianwei Xiang

Link to Full Text:

Pore-Pressure Distributions.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
  • Quinto Simposio Internacional de Itasca - Inscripciones Abiertas ...
    Leer mas
  • Itasca Chile dicta Curso de FLAC3D versión 7.0 El día jueves 12 de junio se realizó la primera parte del Curso de...
    Leer mas

Próximos Eventos
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 Introductory Training - Minneapolis
... Leer mas
16 mar.
FLAC3D Introductory Training - Minneapolis
... Leer mas