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All Outputs (196)

Water repellent soils: the case for unsaturated soil mechanics (2016)
Presentation / Conference Contribution
Beckett, C., Fourie, A., & Toll, D. (2016, September). Water repellent soils: the case for unsaturated soil mechanics. Presented at 3rd European Conference on Unsaturated Soils, Paris, France

Water repellent (or “hydrophobic” or “non-wetting”) soils have been studied by soil scientists for well over a century. These soils are typified by poor water infiltration, which leads to increased soil erosion and poor crop growth. However, the impo... Read More about Water repellent soils: the case for unsaturated soil mechanics.

Flood Holding Capacity: A Novel Concept to Evaluate the Resilience of Amended Soils (2016)
Presentation / Conference Contribution
Kerr, H., Johnson, K., Toll, D. G., & Mansfield, F. (2016, August). Flood Holding Capacity: A Novel Concept to Evaluate the Resilience of Amended Soils. Presented at Geo-Chicago 2016, Chicago, Illinois, USA

The term water holding capacity (WHC) has long been used to help researchers determine how soils respond to typical wetting under rainfall. However the term WHC is insufficient as a measurement to describe how soil responds to flooding events. This p... Read More about Flood Holding Capacity: A Novel Concept to Evaluate the Resilience of Amended Soils.

Soil Water Retention Behaviour of a Sandy Clay Fill Material (2016)
Presentation / Conference Contribution
Toll, D., Asquith, J., Hughes, P., & Osinski, P. (2016, September). Soil Water Retention Behaviour of a Sandy Clay Fill Material. Presented at 3rd International Conference on Transportation Geotechnics, Guimarães, Portugal

The performance of transportation networks is critically dependent on the performance of cutting and embankment slopes. An instrumented embankment has been established at Nafferton farm in North East England to investigate the response of an embankme... Read More about Soil Water Retention Behaviour of a Sandy Clay Fill Material.

Tropical Soils (2016)
Book Chapter
Toll, D. (in press). Tropical Soils. In J. Burland, T. Chapman, H. Skinner, & M. Brown (Eds.), ICE Manual of Geotechnical Engineering (341-361). Institution of Civil Engineers

Influence of initial water content on the mechanical behaviour of an unsaturated sandy clay soil (2016)
Journal Article
Mendes, J., & Toll, D. (2016). Influence of initial water content on the mechanical behaviour of an unsaturated sandy clay soil. International Journal of Geomechanics, 16(6), Article D4016005. https://doi.org/10.1061/%28asce%29gm.1943-5622.0000594

The mechanical behavior of a sandy clay soil was investigated by a series of constant water content triaxial tests on unsaturated samples with suction measurements. The tests were carried out in double-cell triaxial cells on compacted samples and als... Read More about Influence of initial water content on the mechanical behaviour of an unsaturated sandy clay soil.

Geotechnical Engineering for Infrastructure and Development, XVI European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh (2015)
Presentation / Conference Contribution
(2015, September). Geotechnical Engineering for Infrastructure and Development, XVI European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh. Presented at XVI European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE), Edinburgh, Scotland

Geotechnical engineering is a discipline that plays a critical role within all infrastructure and development projects. Failure to adequately account for the influence of the ground regularly leads to increased costs that often can be disproportionat... Read More about Geotechnical Engineering for Infrastructure and Development, XVI European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh.

Research-informed design, management and maintenance of infrastructure slopes: development of a multi-scalar approach (2015)
Presentation / Conference Contribution
Glendinning, S., Helm, P., Rouainia, M., Stirling, R., Asquith, J., Hughes, P., Toll, D., Clarke, D., Powrie, W., Smethurst, J., Hughes, D., Harley, R., Karim, R., Dixon, N., Crosby, C., Chambers, J., Dijkstra, T., Gunn, D., Briggs, K., & Muddle, D. (2015, December). Research-informed design, management and maintenance of infrastructure slopes: development of a multi-scalar approach. Presented at International Symposium on Geohazards and Geomechanics (ISGG2015), Warwick

The UK’s transport infrastructure is one of the most heavily used in the world. The performance of these networks is critically dependent on the performance of cutting and embankment slopes which make up £20B of the £60B asset value of major highway... Read More about Research-informed design, management and maintenance of infrastructure slopes: development of a multi-scalar approach.

Benchmarking selection of parameter values for the Barcelona basic model (2015)
Journal Article
D’Onza, F., Wheeler, S., Gallipoli, D., Barrera Bucio, M., Hofmann, M., Lloret-Cabot, M., Lloret Morancho, A., Mancuso, C., Pereira, J.-M., Romero Morales, E., Sánchez, M., Solowski, W., Tarantino, A., Toll, D., & Vassallo, R. (2015). Benchmarking selection of parameter values for the Barcelona basic model. Engineering Geology, 196, 99-118. https://doi.org/10.1016/j.enggeo.2015.06.022

Seven teams took part in a benchmarking exercise on selection of parameter values for the Barcelona Basic Model (BBM) from experimental data on an unsaturated soil. All teams were provided with experimental results from 9 tests performed on a compact... Read More about Benchmarking selection of parameter values for the Barcelona basic model.

Data Acquisition Software for Controlling Serial Ports with Cloud Data Storage (2014)
Presentation / Conference Contribution
Asquith, J., & Toll, D. (2014, July). Data Acquisition Software for Controlling Serial Ports with Cloud Data Storage. Presented at 2nd International Conference on Information Technology in Geo-Engineering, Durham, UK

A common requirement of laboratory and field data collection is for automated data logging software to control instrumentation and report on the results. Large projects may require a range of different instrumentation each with its own preferred meth... Read More about Data Acquisition Software for Controlling Serial Ports with Cloud Data Storage.

Data Acquisition and Control Software for Automated Resistivity Measurements (2014)
Presentation / Conference Contribution
Toll, D., & Hassan, A. (2014, July). Data Acquisition and Control Software for Automated Resistivity Measurements. Presented at 2nd International Conference on Information Technology in Geo-Engineering, Durham, UK

Automated multi-electrode resistivity systems now allow rapid and efficient data acquisition of electrical resistivity measurements to address a wide range of hydrogeological, geotechnical and environmental problems. In this work, a flexible data acq... Read More about Data Acquisition and Control Software for Automated Resistivity Measurements.

Soil atmosphere interactions for analysing slopes in tropical soils (2014)
Presentation / Conference Contribution
Toll, D., Rahim, M. M., Karthikeyan, M., & Tsaparas, I. (2014, September). Soil atmosphere interactions for analysing slopes in tropical soils. Presented at The 14th International Conference of the International Association for Computer Methods and Advances in Geomechanics, Kyoto, Japan

Modelling of soil-atmosphere interaction for slopes requires a proper understanding of the soil parameters (soil retention curve and the permeability function). This paper reports on numerical investigations of an instrumental residual soil slope in... Read More about Soil atmosphere interactions for analysing slopes in tropical soils.

Information Technology in Geo-Engineering (2014)
Book
Toll, D., Zhu, H., Osman, A., Coombs, W., Li, X., & Rouainia, M. (Eds.). (2014). Information Technology in Geo-Engineering. IOS Press

Information technology continues to evolve and remains central to all aspects of geo-engineering. Key issues are the effective use and re-use of data, particularly within Building Information Modelling (BIM) frameworks; the use of smart monitoring; a... Read More about Information Technology in Geo-Engineering.

Investigation of the directional dependence of soil resistivity in cracking clays (2014)
Presentation / Conference Contribution
Hassan, A., & Toll, D. (2014, July). Investigation of the directional dependence of soil resistivity in cracking clays. Presented at 6th International Conference on Unsaturated Soils, Sydney, Australia

Electrical resistivity is a physical property that defines how a material resists the flow of electricity. The resistivity method is therefore based on the principle that the potential drop across a pair of electrode (P1 and P2) associated with DC or... Read More about Investigation of the directional dependence of soil resistivity in cracking clays.

Interpretation of stresses and strains in unsaturated fine-grained soils (2014)
Presentation / Conference Contribution
Murray, E., Toll, D., & Sivakumar, V. (2014, July). Interpretation of stresses and strains in unsaturated fine-grained soils. Presented at 6th International Conference on Unsaturated Soils, Sydney, Australia

The derivation of Eq. (1) relies on the soil particles and water phase combining and forming aggregates under equilibrium conditions. This may be shown to minimise the thermodynamic potential and is a requirement of equilibrium conditions. The equati... Read More about Interpretation of stresses and strains in unsaturated fine-grained soils.