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Rainfall induced deformation on unsaturated collapsible soils (2021)
Conference Proceeding
Moghaddasi, H., Osman, A., Toll, D., & Khalili, N. (2022). Rainfall induced deformation on unsaturated collapsible soils. In E. Tutumluer, S. NazarianImad, & A. Qamhia (Eds.), Advances in Transportation Geotechnics IV (447-456). https://doi.org/10.1007/978-3-030-77238-3_34

The stability of transportation infrastructure can be affected by seasonal rainfall infiltrated adjacent excavations and natural slopes. The paper investigates the rainfall-induced deformation of an anchored excavation constructed in unsaturated soil... Read More about Rainfall induced deformation on unsaturated collapsible soils.

Water retention and characteristic curves representing tropical clay soils from Africa (2020)
Conference Proceeding
Alhaj, K., Biscontin, G., Elshafie, M., & Osman, A. (2020). Water retention and characteristic curves representing tropical clay soils from Africa. In R. Cardoso, C. Jommi, & E. Romero (Eds.), 4th European Conference on Unsaturated Soils (E-UNSAT 2020) proceedings. https://doi.org/10.1051/e3sconf/202019501019

Soil water retention curves (SWRCs) form an essential component of frameworks coupling the hydromechanical behaviour of unsaturated soils. The curves describe how suction changes with variables such as degree of saturation, void ratio and volumetric/... Read More about Water retention and characteristic curves representing tropical clay soils from Africa.

Centrifuge modelling of pile pull-out tests in expansive soil (2019)
Conference Proceeding
Smit, G., Jacobsz, S., Gaspar, T., & Osman, A. (2019). Centrifuge modelling of pile pull-out tests in expansive soil. In Proceedings of the 17th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE) (1-18). https://doi.org/10.32075/17ecsmge-2019-0175

Designing foundations of wind turbines in expansive soils present a challenge. Piled foundations are often used to mitigate some of the problems associated with construction on expansive soils. Swelling clays frequently occur in an unsaturated state... Read More about Centrifuge modelling of pile pull-out tests in expansive soil.

An expansive clay for centrifuge modelling (2019)
Conference Proceeding
Gaspar, T., Jacobsz, S., Smit, G., & Osman, A. (2019). An expansive clay for centrifuge modelling. In Proceedings of the 17th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE) (1-8). https://doi.org/10.32075/17ecsmge-2019-0421

This paper explores the development of an expansive soil which can be repeatedly reproduced for use in centrifuge models to investigate soil-structure interaction problems involving expansive soils. The study considered two materials, namely a sand-b... Read More about An expansive clay for centrifuge modelling.

Preparations for field testing for the performance validation of piled wind turbine foundations in expansive clays (2019)
Conference Proceeding
da Silva, T., Haigh, S., Elshafie, M., Jacobsz, S., Day, P., & Osman, A. (2019). Preparations for field testing for the performance validation of piled wind turbine foundations in expansive clays. In D. Kalumba (Ed.), Proceedings of the 17th African Regional Conference on Soil Mechanics and Geotechnical Engineering (661-666)

Field-testing of piles in an expansive clay is required for the validation of the design criteria for wind turbine foundations in such soil profiles. The test programme includes lateral load tests to investigate the horizontal stiffness of the soil a... Read More about Preparations for field testing for the performance validation of piled wind turbine foundations in expansive clays.

Numerical analysis of cavity propagation in deep trapdoor experiments (2019)
Conference Proceeding
Osman, A., Jacobsz, S., & Purchase, C. (2019). Numerical analysis of cavity propagation in deep trapdoor experiments. In roceedings of the 17th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE) (1-7). https://doi.org/10.32075/17ecsmge-2019-0408

Large areas of the economically important Gauteng Province of South Africa are underlain by extensively weathered dolomite bedrock in which sinkholes are a common occurrence. Deep trapdoor experi-ments were conducted in the geotechnical centrifuge to... Read More about Numerical analysis of cavity propagation in deep trapdoor experiments.

FuturesMEX: Secure Distributed Futures Market Exchange (2018)
Conference Proceeding
Massacci, F., Ngo, C., Nie, J., Venturi, D., & Williams, J. (2018). FuturesMEX: Secure Distributed Futures Market Exchange. In 2018 IEEE symposium on security and privacy SP 2018 (335-353). https://doi.org/10.1109/sp.2018.00028

In a Futures-Exchange, such as the Chicago Mercantile Exchange, traders buy and sell contractual promises (futures) to acquire or deliver, at some future pre-specified date, assets ranging from wheat to crude oil and from bacon to cash in a desired c... Read More about FuturesMEX: Secure Distributed Futures Market Exchange.

The seconomics (security-economics) vulnerabilities of Decentralized Autonomous Organizations (2017)
Conference Proceeding
Massacci, F., Ngo, C., Nie, J., Venturi, D., & Williams, J. (2017). The seconomics (security-economics) vulnerabilities of Decentralized Autonomous Organizations. In F. Stajano, J. Anderson, B. Christianson, & V. Matyáš (Eds.), Security protocols XXV : 25th international workshop, Cambridge, UK, March 20-22, 2017 : revised selected papers (171-179). https://doi.org/10.1007/978-3-319-71075-4_19

Traditionally, security and economics functionalities in IT financial services and protocols (FinTech) have been perceived as separate objectives. We argue that keeping them separate is a bad idea for FinTech “Decentralized Autonomous Organizations”... Read More about The seconomics (security-economics) vulnerabilities of Decentralized Autonomous Organizations.

An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN) (2015)
Conference Proceeding
Leung, A., Anastasopoulos, I., Augarde, C., Barreto, D., Brennan, A., Brown, M., …Zielinski, M. (2015). An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN). In M. . G. Winter, D. . M. Smith, P. . J. . L. Eldred, & D. . G. Toll (Eds.), Geotechnical engineering for infrastructure and development : XVI European conference on soil mechanics and geotechnical engineering (4289-4294)

ABSTRACT: Design of geotechnical systems is often challenging as it requires the understanding of complex soil behaviour and its influence on field-scale performance of geo-structures. To advance the scientific knowledge and the technological develop... Read More about An overview of research activities and achievement in Geotechnics from the Scottish Universities Geotechnics Network (SUGN).

Modelling tertiary creep in geomaterials using a continuum damage mechanics approach (2014)
Conference Proceeding
Osman, A., & Birchall, T. (2014). Modelling tertiary creep in geomaterials using a continuum damage mechanics approach. In K. Soga, K. Kumar, G. Biscontin, & M. Kuo (Eds.), Geomechanics from micro to macro (705-708). https://doi.org/10.1201/b17395-126

Tertiary creep is often observed in soft rocks and it represents a problem in a mining environment. Tertiary creep behaviour appears due to progressive micro cracking of the material and would result in a loss of strength and stiffness, which may eve... Read More about Modelling tertiary creep in geomaterials using a continuum damage mechanics approach.

On the formulation of thermodynamically-consistent viscoplastic-damage constitutive models (2013)
Conference Proceeding
Birchall, T., & Osman, A. (2013). On the formulation of thermodynamically-consistent viscoplastic-damage constitutive models. In A. S. Osman, W. M. Coombs, & T. Koziara (Eds.), CM13 : proceedings of the International Conference on Computational Mechanics, 25-27 March 2013, Durham, UK

This paper illustrates the formulation of viscoplastic-damage constitutive models using the framework of hyperplasticity. The entire constitutive behaviour is derived from only two scalar potentials; a free energy potential and a dissipation potentia... Read More about On the formulation of thermodynamically-consistent viscoplastic-damage constitutive models.

Dynamic response of a laterally-loaded infinite rigid cylinder embedded in a saturated poroelastic medium (2010)
Conference Proceeding
Osman, A., & Hussein, M. (2010). Dynamic response of a laterally-loaded infinite rigid cylinder embedded in a saturated poroelastic medium. In W. Tizani (Ed.), Proceedings of 13th International Conference on Computing in Civil and Building Engineering (ICCBE 2010) and the 17th International EG-ICE Workshop on Intelligent Computing in Engineering (ICE10), Nottingham, UK, 30 June - 2 July 2010

In this paper, an analytical solution for the response of a rigid cylinder embedded in a full-space poroelastic medium subjected to a dynamic lateral load is derived. The problem is idealised as a two-dimensional problem. The solution is obtained usi... Read More about Dynamic response of a laterally-loaded infinite rigid cylinder embedded in a saturated poroelastic medium.

Numerical investigation of the behaviour of suction caissons in structured clays (2010)
Conference Proceeding
Panayides, S., Rouainia, M., & Osman, A. (2010). Numerical investigation of the behaviour of suction caissons in structured clays. In S. Gourvenec, & D. White. (Eds.), Frontiers in offshore geotechnics II (759-764). https://doi.org/10.1201/b10132-109

This paper investigates the ultimate capacity of suction anchor foundations, using an advanced constitutive model. The paper explores the effect of changing the aspect ratio of the caisson on the undrained load-carrying capacity of the bucket foundat... Read More about Numerical investigation of the behaviour of suction caissons in structured clays.

Three-dimensional finite element analysis of opening interaction in squeezing ground (2010)
Conference Proceeding
Birchall, T., & Osman, A. (2010). Three-dimensional finite element analysis of opening interaction in squeezing ground.

This paper presents a numerical study of the interaction of twin, horizontally aligned openings, deeply embedded in salt rock. Complex three-dimensional (3D) creep analyses were carried out using the Finite Element (FE) method. Findings show that ope... Read More about Three-dimensional finite element analysis of opening interaction in squeezing ground.

Investments and Trade-offs in the Economics of Information Security. (2009)
Conference Proceeding
Ioannidis, C., Pym, D., & Williams, J. (2009). Investments and Trade-offs in the Economics of Information Security. In R. Dingledine, & P. Golle (Eds.), Financial cryptography and data security: 13th International Conference, FC 2009, Accra Beach, Barbados, February 23-26, 2009: revised selected papers (148-166). https://doi.org/10.1007/978-3-642-03549-4_9

We develop and simulate a dynamic model of investment in information security. The model is based on the recognition that both IT managers and users appreciate the trade-off between two of the fundamental characteristics of information security, name... Read More about Investments and Trade-offs in the Economics of Information Security..