Production and disposal of mining and municipal waste poses many challenges from a geotechnical design and analysis perspective. Proper initial design can lead to much more efficient management of waste during and after project closure. Issues of concern from an analysis perspective include: stability of waste deposits such as landfills, waste rock and tailings impoundments; seepage of water, gas and contaminants through these facilities; design of cover or cap systems to prevent water infiltration or the release of gases and water; settlement and consolidation of waste; long term performance; and heterogeneity of waste and the associated characterization of material properties.
GeoStudio can address issues from pre-construction, through construction stages, and into long term performance analysis. The strength of the integration capability in the software allows for differing levels of complexity. Both steady state and transient process can be considered as can the coupling of heat, gas and water fluxes to climate conditions. In addition, seepage models can be linked with contaminant transport models or with slope stability models as required for a comprehensive solution.
Download GeoStudio to view GSZ files
Caesium-137 (Cs-137) is an anthropogenic radioactive isotope formed as a product of nuclear fission. The objective of this example is to analyze Cs-137 transport into an unconfined aquifer using CTRAN/W. The effect of adsorption and decay on solute concentrations and mass discharge is highlighted.
This example simulates a lab experiment similar to that of Gosselin et al (2011; refer to VADOSE/W Engineering Book). Reactive sulphide tailings are placed at the bottom of an air-filled chamber. Oxygen concentrations diminish as the sulphide reactions occur.
This example illustrates the basic methodology for simulating soil-climate interaction of an engineered soil cover system placed over a waste. The primary objective of the simulation is to assess the inflow of water and oxygen through the base of the cover into the waste. A commentary on various aspects of VADOSE/W modeling is also provided.
This illustration shows how VADOSE/W can model actual evaporation from soil. This is a verification example in that the results are compared with a lab experiment. VADOSE/W is unique in that actual evaporation from a ground surface is based on the stress state in the soil; in particular the temperature and relative humidity and matric suction at the soil–climate interface.
SLOPE/W is the leading slope stability software for computing the factor of safety of earth and rock slopes. SLOPE/W can effectively analyze both simple and complex problems for a variety of slip surface shapes, pore-water pressure conditions, soil properties, analysis methods and loading conditions.
SEEP/W analyzes groundwater flow within porous materials such as soil and rock. Its formulation enables analyses ranging from simple saturated steady-state problems to sophisticated saturated/unsaturated time-dependent problems.
SIGMA/W performs stress and deformation analyses of geotechnical, civil and mining works. It can perform a simple linear elastic deformation analysis or a highly sophisticated soil-structure interaction analysis with non-linear material models and coupling to seepage analysis.
QUAKE/W enables dynamic analysis of earth structures subjected to earthquake shaking, or point dynamic forces from a blast or a sudden impact load. It determines the motion and excess pore-water pressures that arise due to shaking.
CTRAN/W models the movement of contaminants through porous materials such as soil and rock. CTRAN/W can be used to model simple diffusion-dominated systems through to complex advection-dispersion systems with first-order reactions.
TEMP/W enables analysis of thermal changes in the ground due to environmental factors or the construction of facilities such as buildings or pipelines. TEMP/W can be applied to the geothermal analysis and design of geotechnical, civil, and mining engineering projects.
AIR/W analyzes groundwater-air interaction problems within porous materials such as soil and rock. It enables analyses ranging from simple, single-phase air-transfer analyses to complex coupled air-water systems.
VADOSE/W analyzes interactions at the ground surface to determine environmental impacts on the movement of water through the unsaturated vadose zone and into the local groundwater regime. Potential interactions considered in VADOSE/W include infiltration due to rainfall and snowmelt, root transpiration, gas diffusion, and surface runoff, evaporation and ponding.