Discrete piles are used to stabilise infrastructure slopes, especially where there is insufficient additional land to allow construction of large toe berms or regrading of the slope. Compared with...
Controlling clay pore pressures for cut-and-cover tunneling (2007)
Roberts, T.O.L., Roscoe, H., Powrie, W., Butcher, D.J.E.
To facilitate construction of the Channel Tunnel Rail Link through Ashford in cut-and-cover tunnels and retained cut, it was necessary to control pore water pressures in the relatively...
Landfill Science Research Needs: After the EU Landfill Directive (2007)
Powrie, W., Beaven, R.P., Watson, G.V.R, Richards, D.J., Barker, J.A., White, J.K., ...
Potential clogging of gravel and tyre drainage layers by methanogenic leachates (2007)
Hudson, A.P., Beaven, R.P., Knox, K., Powrie, W., Smallman, D.J.
Operation and performance of horizontal wells for leachate control in a waste landfill (2007)
Powrie, W., Cox, S.E., Beaven, R.P.
This paper presents data on gas and leachate flow rates and leachate levels obtained during a 600 day pumping trial on three retro-fitted horizontal wells in a domestic waste landfill at Rainham, UK....
Centrifuge modelling of embedded retaining walls with stabilising bases (2007)
Embedded retaining walls are sometimes supported by means of a rigid platform or stabilising base projecting in front of the wall at formation level. This form of construction is useful where props...
Hydraulic conductivity of whole and shredded tyres for use in landfill drainage systems (2007)
Hudson, A.P., Beaven, R.P., Powrie, W., Parkes, D.
Whole or shredded scrap tyres are sometimes proposed as an alternative to conventional aggregates in landfill drainage systems. However, landfill basal drainage systems are subjected to large...
Leachate recirculation in a landfill: a simple 1-D model (2007)
White, J.K., Beaven, R.P., Powrie, W., Knox, K.
Leachate is the liquid phase present in the pore spaces of the solid waste material in a landfill. The leachate arises from the liquid content of the waste when it is placed in the landfill, and from...
Stress changes in the ground below ballasted railway track during train passage (2007)
Powrie, W., Yang, L.A, Clayton, C.R.I.
The design of railway track formations has traditionally been empirically rather than analytically based, with ballast and sub-ballast layer thicknesses specified mainly on the basis of previous...
Briefing: Defra’s new technologies demonstrator programme (2007)
The EU Landfill Directive sets targets that the UK must meet in respect of the diversion of biodegradable municipal waste away from landfill. This paper describes a programme established by the UK...
Performance of push-in pressure cells in overconsolidated clay (2007)
Richards, D.J., Clark, J., Powrie, W., Heymann, G.
Low profile push-in pressure cells (spade cells) are commonly used to measure total horizontal stresses in overconsolidated clays. It is known that spade cells over-read the in situ stress in such...
Monitoring the dynamic displacements of railway track (2007)
Bowness, D., Lock, A.C., Powrie, W., Priest, J.A., Richards, D.J.
This paper reports the development and testing of two independent, innovative techniques for measuring rail displacements. One system combines remote video monitoring with particle image velocimetry,...
Richards, D.J., Powrie, W., Roscoe, H., Clark, J.
The design and construction of a contiguous bored pile propped retained cut on the approaches to Ashford International Station raised some challenging design issues. Design problems associated with...
Monitoring the dynamic displacements of railway track (2007)
Bowness, D, Lock, A. C., Powrie, W., Priest, J. A., Richards, D. J.
This paper reports the initial development and testing of two independent and innovative techniques for measuring rail displacements. One system combines remote video monitoring with particle image...
Compressibility of tyres for use in landfill drainage systems (2006)
Beaven, R.P, Powrie, W, Hudson, A.P, Parkes, D.J
Whole or shredded scrap tyres are sometimes proposed as an alternative to conventional aggregates in landfill drainage systems. Landfill basal drainage systems are, however, subjected to large...
Compressibility of tyres for use in landfill drainage systems (2006)
Beaven, R.P., Powrie, W., Hudson, A.P., Parkes, D.J.
Whole or shredded scrap tyres are sometimes proposed as an alternative to conventional aggregates in landfill drainage systems. Landfill basal drainage systems are, however, subjected to large...
Seasonal changes in pore water pressure in a grass covered cut slope in London clay (2006)
Smethurst, J., Clarke, D., Powrie, W.
This paper presents field measurements of seasonal moisture content and pore water pressure changes within the surface drying zone of a cut slope in the London Clay at Newbury, Berkshire, UK. A...
Sustainable waste management – what and how? (2006)
Historically, 'developed' societies have adopted a linear approach to the use of resources, with natural assets being processed, used and ultimately discarded as wastes with little if any thought...
Installation of horizontal wells in landfilled waste using directional drilling (2006)
Cox, S.E., Beaven, R. P., Powrie, W., Cole, D.J.
Leachate levels within a landfill must often be controlled for environmental and/or regulatory reasons by means of pumping from wells. Conventional vertical wells are usually used for this purpose,...
Installation effects of a bored pile wall in overconsolidated clay (2006)
Richards, D.J., Clark, J., Powrie, W.
In situ embedded retaining walls are used to form basements and cuttings in urban areas throughout the world, particularly where space is restricted. It is generally accepted that the process of...
Attenuation of toluene by mineral landfill liners (2005)
Stringfellow, A., Simoes, A., Smallman, D.J., Beaven, R.P., Powrie, W., Potter, H.
Numerical modelling of plane strain tests on sands using a particulate approach (2005)
Powrie, W., Ni, Q., Harkness, R.M., Zhang, X.
This paper describes the results of a series of numerical plane strain test simulations on a particulate material, carried out using the three-dimensional particle flow code PFC-3D. Samples comprised...
Innovative remote video monitoring of railway track displacements (2005)
Bowness, D., Lock, A.C., Richards, D.J., Powrie, W.
This paper reports the initial development and testing of an innovative technique for measuring rail displacements that combines remote video monitoring with particle image velocimetry (PIV). A...
Soil mechanics: concepts and applications (2nd edition) (2004)
The aim of this book is to encourage students to develop an understanding of the fundamentals of soil mechanics. It builds a robust and adaptable framework of ideas to support and accommodate the...
Triaxial tests on an unbonded locked sand (2004)
This paper describes the results of a series of triaxial tests carried out to investigate the influence of fabric structure on the yield and failure behaviour of intact Reigate silver sand - a locked...
Geotechnical analysis of a retaining wall in weak rock (2004)
Richards, D.J., Clayton, C.R.I., Powrie, W., Hayward, T.
The determination of realistic values of stiffness and in-situ horizontal stress is challenging in softer materials, but in weak rocks where discontinuities are typically present it is particularly...
Modelling the compression behaviour of landfilled domestic waste (2004)
Hudson, A. P., White, J.K., Beaven, R. P., Powrie, W.
This Paper discusses the mechanisms involved in the compression of domestic waste, and how the resulting compression behaviour may be modelled. Reference is made to experimental data illustrating the...
Embedded retaining walls: guidance for economic design (2003)
Gaba, A.R., Simpson, B., Beadman, D.R., Powrie, W.
CIRIA Funder's Report CP96 was issued to the core members of CIRIA in March 2002. It is now, or will shortly be, available to a wider audience. This note describes the background to this research...
Deformation and failure modes of drystone retaining walls (2002)
Powrie, W., Harkness, R.M., Zhang, X., Bush, D.I.
In this paper, the factors controlling the deformation of drystone retaining walls are investigated by means of discrete element analyses. It is shown that toppling failure of unweathered drystone...
Three-dimensional effects in the construction of a long retaining wall (2002)
Gourvenec, S., Powrie, W., De Moor, E.K.
Although long retaining walls are usually analysed in the permanent condition by means of a plane strain analysis, three-dimensional effects may be significant in limiting ground movements at certain...
Centrifuge model tests on embedded retaining walls supported by earth berms (2002)
Earth berms are often used for the temporary support of embedded retaining walls, but there is a lack of information concerning the factors that influence their behaviour. In this paper, the results...
Undrained analysis of earth berms as temporary supports for embedded retaining walls (2001)
Earth berms can provide an effective and economic means of enhancing the short-term stability of an embedded retaining wall but there is no generally accepted procedure for determining their...
Soil stiffness in stress paths relevant to diaphragm walls in clay (2001)
Powrie, W., Pantelidou, H., Stallebrass, S. E.
The authors report an extensive triaxial testing programme on reconstituted kaolin to investigate the influence of stress paths on the stiffness of soil elements in the vicinity of diaphragm walls....
Geotechnical investigation of the "Titanic" wreck site (2000)
Best, A.I., Powrie, W., Hayward, T., Barton, M.
Recent marine forensic investigations have largely unravelled the sequence of events concerning the sinking of the R.M.S. Titanic and its descent through nearly 3800 m of water to the seafloor on the...