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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 calculation of cumulative strain around full-flow penetrometers in steady-state conditions (2014)
Journal Article
Osman, A., & Randolph, M. (2015). On the calculation of cumulative strain around full-flow penetrometers in steady-state conditions. International Journal for Numerical and Analytical Methods in Geomechanics, 39(4), 368-387. https://doi.org/10.1002/nag.2312

An approximate solution for the effects of high strain rates, and gradual strength degradation, on the penetration resistance of penetrometers can be obtained by combining the strain-path method with the classical upper bound theorem. The stream path... Read More about On the calculation of cumulative strain around full-flow penetrometers in steady-state conditions.

Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale (2014)
Journal Article
Greathouse, J., Johnson, K., & Greenwell, H. (2014). Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale. Minerals, 4(2), 519-540. https://doi.org/10.3390/min4020519

The role of mineral surfaces in the adsorption, transport, formation, and degradation of natural organic matter (NOM) in the biosphere remains an active research area owing to the difficulties in identifying proper working models of both NOM and mine... Read More about Interaction of Natural Organic Matter with Layered Minerals: Recent Developments in Computational Methods at the Nanoscale.

A Semi-analytical solution for consolidation around a spherical cavity in an elasto-plastic medium and its potential application for tunneling (2014)
Journal Article
Osman, A., & Rouainia, M. (2014). A Semi-analytical solution for consolidation around a spherical cavity in an elasto-plastic medium and its potential application for tunneling. International Journal of Computational Methods, 11(02), Article 1342010. https://doi.org/10.1142/s0219876213420103

An analytical solution for consolidation around spherical cavity contraction is developed. This solution has the potential to evaluate consolidation around tunnel heads. The initial excess pore water pressure immediately after the creation of the cav... Read More about A Semi-analytical solution for consolidation around a spherical cavity in an elasto-plastic medium and its potential application for tunneling.

Healthy land? An examination of the area-level association between brownfield land and morbidity and mortality in England (2014)
Journal Article
Bambra, C., Robertson, S., Kasim, A., Smith, J., Cairns-Nagi, J., Copeland, A., …Johnson, K. (2014). Healthy land? An examination of the area-level association between brownfield land and morbidity and mortality in England. Environment and Planning A, 46(2), 433-454. https://doi.org/10.1068/a46105

It is increasingly understood that the physical environment remains an important determinant of area-level health and spatial and socioeconomic health inequalities. Existing research has largely focused on the health effects of differential access to... Read More about Healthy land? An examination of the area-level association between brownfield land and morbidity and mortality in England.

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.

Response of a tunnel deeply embedded in a viscoelastic medium (2012)
Journal Article
Birchall, T., & Osman, A. (2012). Response of a tunnel deeply embedded in a viscoelastic medium. International Journal for Numerical and Analytical Methods in Geomechanics, 36(15), 1717-1740. https://doi.org/10.1002/nag.1069

This paper presents a three-dimensional energy-based solution for the time-dependent response of a deeply embedded and unsupported semi-infinite tunnel of circular cross-section. The tunnel is taken to be excavated quasi-instantaneously from an infin... Read More about Response of a tunnel deeply embedded in a viscoelastic medium.

An Analytical Solution for the Consolidation around a Laterally Loaded Pile (2012)
Journal Article
Osman, A., & Randolph, M. (2012). An Analytical Solution for the Consolidation around a Laterally Loaded Pile. International Journal of Geomechanics, 12(3), 199-208. https://doi.org/10.1061/%28asce%29gm.1943-5622.0000123

This paper presents a closed-form analytical solution for the consolidation of soil around a laterally loaded pile, assuming the soil skeleton deforms elastically and under plane strain conditions. The problem is idealized as a circular rigid disk su... Read More about An Analytical Solution for the Consolidation around a Laterally Loaded Pile.

Dynamic response of an axially loaded rigid sphere embedded in a saturated poroelastic medium (2012)
Journal Article
Osman, A., & Rouainia, M. (2012). Dynamic response of an axially loaded rigid sphere embedded in a saturated poroelastic medium. Archive of Applied Mechanics, 82(3), 407-421. https://doi.org/10.1007/s00419-011-0564-6

In this paper, an analytical solution for the response of a rigid sphere embedded in a full space poroelastic medium subjected to a dynamic lateral load is derived. The solution is obtained using Biots theory for acoustic waves. In this solution, the... Read More about Dynamic response of an axially loaded rigid sphere embedded in a saturated poroelastic medium.

The impact of changes in the water table and soil moisture on structural stability of buildings and foundation systems: Systematic review CEE10-005 (SR90) (2012)
Report
Toll, D., Abedin, Z., Buma, J., Cui, Y., Osman, A., & Phoon, K. (2012). The impact of changes in the water table and soil moisture on structural stability of buildings and foundation systems: Systematic review CEE10-005 (SR90). [No known commissioning body]

This Systematic Review aims to consider the impact of changes in the ground water table and soil moisture regime on structural stability of buildings and foundation systems. The possible changes in the water table levels and soil moisture conditions... Read More about The impact of changes in the water table and soil moisture on structural stability of buildings and foundation systems: Systematic review CEE10-005 (SR90).

Oxidative breakdown of acid orange 7 by a manganese oxide containing mine waste: Insight into sorption, kinetics and reaction dynamics (2010)
Journal Article
Clarke, C. E., & Johnson, K. L. (2010). Oxidative breakdown of acid orange 7 by a manganese oxide containing mine waste: Insight into sorption, kinetics and reaction dynamics. Applied Catalysis B: Environmental, 101(1-2), 13-20. https://doi.org/10.1016/j.apcatb.2010.08.020

The reaction rates and orders of azo dye, acid orange 7 (AO 7), oxidation by a Mn oxide containing mine tailings were determined. The reaction is pseudo-first order with respect to the tailings surface area concentration [SA] and pseudo-fractional (0... Read More about Oxidative breakdown of acid orange 7 by a manganese oxide containing mine waste: Insight into sorption, kinetics and reaction dynamics.

Response of a solid infinite cylinder embedded in a poroelastic medium and subjected to a lateral load (2010)
Journal Article
Osman, A., & Randolph, M. (2010). Response of a solid infinite cylinder embedded in a poroelastic medium and subjected to a lateral load. International Journal of Solids and Structures, 47(18-19), 2414-2424. https://doi.org/10.1016/j.ijsolstr.2010.05.001

This paper presents an analytical solution for the response of a poroelastic medium around a laterally loaded rigid cylinder using Biot’s consolidation theory. A plane-strain section of the cylinder-porous medium system is considered and the problem... Read More about Response of a solid infinite cylinder embedded in a poroelastic medium and subjected to a lateral load.

Comparison between coupled and uncoupled consolidation analysis of a rigid sphere in a porous elastic infinite space (2010)
Journal Article
Osman, A. (2010). Comparison between coupled and uncoupled consolidation analysis of a rigid sphere in a porous elastic infinite space. Journal of Engineering Mechanics, 136(8), 1059-1064. https://doi.org/10.1061/%28asce%29em.1943-7889.0000149

Linear consolidation analyses are usually treated either by means of Terzaghi-Rendulic uncoupled theory or Biot's consolidation theory. In this note, the problem of consolidation displacements around an axially loaded sphere was considered. It is dem... Read More about Comparison between coupled and uncoupled consolidation analysis of a rigid sphere in a porous elastic infinite space.

Stability of unlined twin tunnels in undrained clay (2010)
Journal Article
Osman, A. (2010). Stability of unlined twin tunnels in undrained clay. Tunnelling and Underground Space Technology, 25(3), 290-296. https://doi.org/10.1016/j.tust.2010.01.004

This note presents solutions for the problem of the stability of twin tunnels excavation in soft ground. A compatible displacement field has been derived to idealise ground deformations around shallow, unlined, twin tunnels embedded within an undrain... Read More about Stability of unlined twin tunnels in undrained clay.

Oxidative Decolorization of Acid Azo Dyes by a Mn Oxide Containing Waste (2010)
Journal Article
Clarke, C., Kielar, F., Talbot, H., & Johnson, K. (2010). Oxidative Decolorization of Acid Azo Dyes by a Mn Oxide Containing Waste. Environmental Science and Technology, 44(3), 1116-1122. https://doi.org/10.1021/es902305e

A Mn oxide containing mine tailings, generated in the Kalahari Mn fields, has been shown to oxidatively breakdown acid azo dyes acid orange (AO) 7, acid red 88, acid red 151 and acid yellow 36 but not acid yellow 9. The total reducible Mn content of... Read More about Oxidative Decolorization of Acid Azo Dyes by a Mn Oxide Containing Waste.