Gassy soils are defined as those soils which contain a relatively large amount of gas dissolved in the pore fluid. Examples include the Alberta Oil Sands, marine sediments from deep ocean locations, geopressure reservoirs along the Gulf Coast, and other naturally occurring, gas-charged reservoirs.The equilibrium behaviour during unloading with undrained boundary conditions is examined. Contrary to conventional experience with soils containing only a small amount of gas, gassy soils exhibit an equilibrium pore pressure response close to zero. Effective stress, and hence strength, decrease commensurately with total stress at the soil boundary.Laboratory observations of gassy soil behaviour are presented, which confirm the predictive accuracy of the theoretical model. Parameters important to the determination of gassy soil behaviour include the in situ state of stress (uo and uo), the liquidlgas saturation pressure (u,,,), the gas solubility (H), saturation ( S ) , and the soil and liquid compressibilities (PT and PL).Les sols gazeux sont difinis cornrne &ant ceux qui conteinnent une grande quantite de gaz dissous dans le fluide interstitiel. Les exemples comprennent les sable bitumineux de 1' Alberta, les sediments marins en eau profonde, les reservoirs gCopressurisCs le long de la CBte du Golfe et d'autres reservoirs naturels charges de gaz.Le comportement h 1'Cquilibre lors d'un dechargement en condition non-drainee est examine. Contrairement B llexpCrience acquise dans les sols contenant une faible quantitk de gaz, les sols gazeus presentent une pression interstitielle B 1'Cquilibre proche de zero. Les contraintes effectives, et par consequent la resistance au cisaillement, diminuent proportionellement aux contraintes totales aux limites du sol.Des observations de laboratoire sur le comportement des sols gazeux sont presentees; elles confirment la precision des prCdictions du modble theorique. Les parambtres importants dans la determination du comportement des sols gazeus incluent 1'Ctat de contraintes en place (uo et uo), la pression de saturation liquide-gaz (u",), la solubilite du gaz ( H ) , la saturation ( S ) et les compressibilitCs du sol et du liquide (PT et PL).
The Canadian geotechnical engineering community has completed a major collaborative 5 year research project entitled the Canadian Liquefaction Experiment (CANLEX). The main objective of the project was to study the phenomenon of soil liquefaction, which can occur in saturated sandy soils and is characterized by a large loss of strength or stiffness resulting in substantial deformations. The intent of this paper is to compare, interpret, and summarize the large amount of field and laboratory data obtained for six sites in Western Canada as part of the CANLEX project. The sites are compared in terms of both flow-liquefaction and cyclic-softening considerations. The paper presents a number of conclusions drawn from the project as a whole, in terms of both fundamental and practical significance.Key words: sand, flow liquefaction, cyclic softening, CANLEX.
In 2011, Alberta Innovates-Energy and Environment Solutions (AI-EES), Canada awarded a contract to the Consortium of Tailings Management Consultants (CTMC) to prepare an Oil Sands Tailings Technology Deployment Roadmap. In this paper the work done in terms of the contract is referred to as the project. The project objective was to create a roadmap outlining further research and development needs for promising tailings treatment / dewatering technologies. This paper describes the objectives and main components of the project, the technical process whereby these goals were met, and the key recommendations arising from the project work. Recognising that the development of tailings roadmaps may hold potential for mining sectors other than the Canadian oil sands, the authors reflect on some of the key observations and conclusions from the study, and offer some insights and recommendations about the technology assessment and roadmap development process that was employed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2025 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.