Optimization of Open-Pit Mine Depressurization System Using Simulated Annealing Technique

Mohan, S.; Sreejith, P.; Pramada, S. K.

doi:10.1061/(asce)0733-9429(2007)133:7(825)

Cited by 6 publications

(1 citation statement)

References 11 publications

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“…This model was selected because it is easy to set up, free to use, and GUIs are inexpensive to run the model, though it cannot simulate the complex geological features compared to other models (e.g., FEFLOW). Also, in previous studies, several researchers [17,37,38] have employed the MODFLOW model for the design and optimization of foundation pit dewatering projects and concluded that it can simulate the dewatering systems efficiently.…”

Section: Numerical Modelmentioning

confidence: 99%

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

et al. 2019

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This study investigates a large deep foundation pit of a hydraulic structure rehabilitation program across the Indus river, in the Punjab province of Pakistan. The total area of the construction site was 195,040 m 2 . Two methods, constant head permeability test and Kozeny-Carman equation, were used to determine the hydraulic conductivity of riverbed strata, and numerical simulations using the three-dimensional finite-difference method were carried out. The simulations first used hydraulic conductivity parameters obtained by laboratory tests, which were revised during model calibration. Subsequently, the calibrated model was simulated by different aquifer hydraulic conductivity values to analyze its impact on the dewatering system. The hydraulic barrier function of an underground diaphragm wall was evaluated at five different depths: 0, 3, 6, 9, and 18 m below the riverbed level. The model results indicated that the aquifer drawdown decreases with the increase in depth of the underground diaphragm wall. An optimal design depth for the design of the dewatering system may be attained when it increases to 9 m below the riverbed level.

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Section: Numerical Modelmentioning

confidence: 99%

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

et al. 2019

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Coupled simulation–optimization model for draining confined aquifer via underground boreholes to prevent water inrush of coal mines

Meng

Feng

2018

Environ Earth Sci

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Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

Borges

Bacellar

Grasso³

et al. 2023

Environ Earth Sci

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The design of open-pit mines should balance safety and economy. However, safe geotechnical conditions generally involve redesigning the geometry of slopes and groundwater drawdown, signi cantly increasing the costs of mining operations. The use of numerical models to simulate groundwater drawdown and slope stability can be an alternative to assess cost-bene t trade-offs for decision-making. This study documents a mining plan using groundwater drawdown scenarios that illustrate how geotechnical, economic, and environmental indicators can be combined to obtain optimum slope geometry for open-pit mining. The optimization approach analyzed different scenarios of groundwater drawdown for the nal pit of a phosphate mine to improve the pit slopes stability. The groundwater simulation scenarios included the combination of deep horizontal drains and pumping wells. Stability analyzes using the limit equilibrium method were used to obtain the bench, inter-ramp, and overall factors of safety of different representative sections. The factors of safety obtained, the drawdown costs and the water table elevation of each section were selected as indicators for obtaining the optimal drawdown scenario using a multi-objective tool. The groundwater control system obtained with 11 horizontal drains and 1 pumping well was considered the most adequate from the geotechnical and economic perspectives. Slope geometry optimization obtained with this drawdown scenario led to adequate inter-ramp and overall safety factors for the nal pit design, reducing the barren-to-ore ratio to 0.38, much less than the present ratio (≈ 3). The results are important for optimizing the slope geometry of open-pit mines and can be replicated in other regions.

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Optimization of Open-Pit Mine Depressurization System Using Simulated Annealing Technique

Cited by 6 publications

References 11 publications

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

Finite-Difference Numerical Simulation of Dewatering System in a Large Deep Foundation Pit at Taunsa Barrage, Pakistan

Coupled simulation–optimization model for draining confined aquifer via underground boreholes to prevent water inrush of coal mines

Slope geometry optimization considering groundwater drawdown scenarios at an open-pit phosphate mine, southeastern Brazil

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