?To explore the spatial strength distribution of backfill in the stope, a group of experiments in a large similar stope model was designed for simulating the consolidation of cemented tailings backfill (CTB) in a stope. The height of CTB in similar stope model was measured to analyse the flow and sedimentation characteristics. The unconfined compressive strength (UCS) test on specimens cored in the different position of CTB sample in similar stope model was conducted. Moreover, the particle size and cement content of CTB sample were tested to help to explain the mechanism. The results show that during the flow and sedimentation of filling slurry in the model, inconsistency of the particle size and cement content leads to the inconsistency of strength. In the flow direction (horizontal direction), the median particle size of CTB first increases and then decreases, the cement content of CTB decreases slowly and then increases sharply, and the strength of CTB first decreases and then rises. In the sedimentation direction (vertical direction), the cement content of CTB decreases with the increase of depth, while the strength of CTB increases with the increase of depth. The strength is affected by the interaction between particle size and cement content, and the higher cement content of CTB does not translate into higher strength. The results provide a theoretical basis for improving the quality of CTB and optimizing the design.
While not specific to tailings, knowledge of geosynthetics is valuable to tailings engineers. This webinar presents an overview of the worldwide industry known as Geosynthetics. Each type will be described and elements of their primary design function will also be explained. Applications will then be addressed in the four major thrust areas that geosynthetics have focused upon. They are: transportation and geotechnical (paved and unpaved roads, walls, slopes); geoenvironmental (landfills, surface impoundments); hydraulic engineering (dams, tunnels, canals); and private development (parks, sport fields, aquaculture, agriculture).
Focused on providing an update of the CPT-based SBT classification systems using behavior-based descriptions. The update includes a method to identify the existence of microstructure in soils. Examples are used to illustrate the advantages of such a system.
Library contains journals, books, magazines, proceedings, standards and more. Use the search to find information on tailings and related topics. Link brings you to a search of the ASCE library on "Tailings".
This bulletin provides a framework for classifying different types of tailings based on their geotechnical properties and provides typical geotechnical parameters for the different tailings types. It also presents technologies for dewatering tailings from thickening to filtration.
Geohazards comprise a subgroup of natural hazards associated with geotechnical, hydrotechnical, tectonic, snow and ice, and geochemical processes that can pose a threat to worker and public safety, asset integrity, and asset management lifecycle cost. Like for most types of threats, the risks from geohazards can be assessed qualitatively or quantitatively and used to inform a geohazard management program. Most mining companies use risk matrices to aid in the assessment, prioritisation, communication and management of corporate risks. These matrices use standardised descriptions of likelihood and consequence to help users assess risks of negative outcomes to health, safety, the environment, assets, and reputation, and are tailored to each organisations types of risk exposure and level of risk tolerance. Geohazards and related geotechnical failures can represent low-probability, high-consequence events that plot in the highest risk zones of most corporate risk matrices. Variability in spatial and temporal probabilities for people and infrastructure exposed to geohazards can have a large influence on risk exposure, and this can be challenging to assess and communicate effectively with some risk matrices. Risk is scale-dependent: the business risk due to rockfall from a single slope along a mine access road is vastly different than the total risk due to rockfalls from all slopes along that road, yet guidance is often missing on how the risks from these scenarios should be plotted on a risk matrix. These and other pitfalls associated with use of corporate risk matrices for informed geohazard management are explored.
This webinar is on using the CPT for quality control of ground improvement, with a focus on deep compaction. It will discuss and present appropriate methods of creating CPT-based criteria for ground improvement.
This webinar will continue from the Introduction to CPT and take a more in-depth look at using the CPT to evaluate soils for liquefaction. It is part one of a three part series on using the CPT for liquefaction. This will cover mostly the introduction and theory.
This webinar continues on from CPT for Soil Liquefaction, part 1 and discusses using the CPT to evaluate flow liquefaction.
This webinar will continue from parts 1 and 2 of using the CPT to evaluate soils for liquefaction and focus on real-world examples using the software program Cliq. CLiq is a commercially available software program available from Geologismiki: www.geologismiki.gr