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The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil (2022)
Conference Proceeding
Kumar, A., Azizi, A., & Toll, D. (2022). The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil. In A. Lemnitzer, & A. W. Stuedlein (Eds.), Geo-Confress 2022: Geoenvironmental Engineering; Unsaturated Soils; and Contemporary Topics in Erosion, Sustainability, and Coal Combustion Residuals (274-283). https://doi.org/10.1061/9780784484050.029

This paper presents the results of cyclic triaxial tests conducted on unsaturated soil samples recovered from the railway embankment of a South African coal line to investigate the influence of cyclic loading frequency on a formation layer material,... Read More about The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil.

First Saturation and Resaturation of High Capacity Tensiometers with 1.5 MPa High Air Entry Value (HAEV) Ceramic Filters (2018)
Conference Proceeding
Mendes, J., Gallipoli, D., Toll, D., & Tarantino, A. (2018). First Saturation and Resaturation of High Capacity Tensiometers with 1.5 MPa High Air Entry Value (HAEV) Ceramic Filters. In PanAm Unsaturated Soils 2017 (514-522). https://doi.org/10.1061/9780784481684.052

High capacity tensiometers, or HCTs, are sensors that can measure negative pore water pressures (soil suctions) between −1.5 and −2 MPa. To achieve such measured values, HCTs first need to be fully saturated by water. For the first saturation of an i... Read More about First Saturation and Resaturation of High Capacity Tensiometers with 1.5 MPa High Air Entry Value (HAEV) Ceramic Filters.

Deterioration of geotechnical infrastructure: the influence of asset aging through environmental cycling (2017)
Conference Proceeding
Stirling, S., Helm, P., Glendinning, S., Asquith, J., Hughes, P., & Toll, D. (2017). Deterioration of geotechnical infrastructure: the influence of asset aging through environmental cycling.

This paper sets out to establish the implication of weather driven deterioration processes on the long-term performance of infrastructure earthworks. With particular reference to UK transport network slopes, the work presented here centres on their s... Read More about Deterioration of geotechnical infrastructure: the influence of asset aging through environmental cycling.

Data-driven Classification Approaches for Stability Condition Prediction of Soil Cutting Slopes (2017)
Conference Proceeding
Tinoco, J., Gomes Correia, A., Cortez, P., & Toll, D. (2017). Data-driven Classification Approaches for Stability Condition Prediction of Soil Cutting Slopes.

For transportation infrastructures, one of the greatest challenges today is to keep large-scale transportation networks, such as railway networks, operational under all conditions. In this paper we present a tool aimed at helping in management tasks... Read More about Data-driven Classification Approaches for Stability Condition Prediction of Soil Cutting Slopes.

Soil water retention behaviour for an instrumented embankment (2016)
Conference Proceeding
Toll, D., Hughes, P., & Asquith, J. (2016). Soil water retention behaviour for an instrumented embankment. . https://doi.org/10.1051/e3sconf/20160910013

Measurement of soil suction is important as soil suction is one of the two stress-state variables that control both the hydro and mechanical behaviour of unsaturated soils. One of the soil suction measurement techniques is the filter paper method. Ev... Read More about Soil water retention behaviour for an instrumented embankment.

Comparison of Soil Water Retention Curves for sandy clay, obtained using different laboratory testing methods (2016)
Conference Proceeding
Osinski, P., Toll, D., & Koda, E. (2016). Comparison of Soil Water Retention Curves for sandy clay, obtained using different laboratory testing methods. . https://doi.org/10.1051/e3sconf/20160911008

The design of engineering structures is still a challenging task when considering unsaturated soil mechanics behaviour. The present paper focuses on analysing Soil Water Retention Curves (SWRC) for clayey soil samples collected from a purpose built e... Read More about Comparison of Soil Water Retention Curves for sandy clay, obtained using different laboratory testing methods.

Water repellent soils: the case for unsaturated soil mechanics (2016)
Conference Proceeding
Beckett, C., Fourie, A., & Toll, D. (2016). Water repellent soils: the case for unsaturated soil mechanics. . https://doi.org/10.1051/e3sconf/20160911011

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.

Modelling of the water retention characteristic of deformable soils (2016)
Conference Proceeding
Wang, Y., Sheng, D., Ross, K., & Toll, D. G. (2016). Modelling of the water retention characteristic of deformable soils. . https://doi.org/10.1051/e3sconf/20160911005

A recently proposed water retention model has been further developed for the application on unsaturated deformable soils. The physical mechanisms underpinning the water retention characteristic of soils was at first described in terms of traditional... Read More about Modelling of the water retention characteristic of deformable soils.

Flood Holding Capacity: A Novel Concept to Evaluate the Resilience of Amended Soils (2016)
Conference Proceeding
Kerr, H., Johnson, K., Toll, D. G., & Mansfield, F. (2016). Flood Holding Capacity: A Novel Concept to Evaluate the Resilience of Amended Soils. . https://doi.org/10.1061/9780784480120.041

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)
Conference Proceeding
Toll, D., Asquith, J., Hughes, P., & Osinski, P. (2016). Soil Water Retention Behaviour of a Sandy Clay Fill Material. . https://doi.org/10.1016/j.proeng.2016.06.039

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.

Geotechnical Engineering for Infrastructure and Development, XVI European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh (2015)
Conference Proceeding
(2015). Geotechnical Engineering for Infrastructure and Development, XVI European Conference on Soil Mechanics and Geotechnical Engineering, Edinburgh. In M. Winter, D. Smith, P. Eldred, & D. Toll (Eds.), . https://doi.org/10.1680/ecsmge.60678.vol1.001

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)
Conference Proceeding
Glendinning, S., Helm, P., Rouainia, M., Stirling, R., Asquith, J., Hughes, P., …Muddle, D. (2015). Research-informed design, management and maintenance of infrastructure slopes: development of a multi-scalar approach. In International Symposium on Geohazards and Geomechanics (ISGG2015). https://doi.org/10.1088/1755-1315/26/1/012005

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.

Data Acquisition Software for Controlling Serial Ports with Cloud Data Storage (2014)
Conference Proceeding
Asquith, J., & Toll, D. (2014). Data Acquisition Software for Controlling Serial Ports with Cloud Data Storage. In D. G. Toll, H. Zhu, A. Osman, W. Coombs, X. Li, & M. Rouainia (Eds.), Information Technology in Geo-Engineering (163-169). https://doi.org/10.3233/978-1-61499-417-6-163

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)
Conference Proceeding
Toll, D., & Hassan, A. (2014). Data Acquisition and Control Software for Automated Resistivity Measurements. In D. G. Toll, H. Zhu, A. Osman, W. Coombs, X. Li, & M. Rouainia (Eds.), Information Technology in Geo-Engineering (170-176). https://doi.org/10.3233/978-1-61499-417-6-170

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)
Conference Proceeding
Toll, D., Rahim, M. M., Karthikeyan, M., & Tsaparas, I. (2014). Soil atmosphere interactions for analysing slopes in tropical soils. In F. Oka, A. Murakami, R. Uzuoka, & S. Kimoto (Eds.), Computer Methods and Recent Advances in Geomechanics (1333-1338)

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.

Investigation of the directional dependence of soil resistivity in cracking clays (2014)
Conference Proceeding
Hassan, A., & Toll, D. (2014). Investigation of the directional dependence of soil resistivity in cracking clays. In N. Khalili, A. Russell, & A. Khoshghalb (Eds.), Unsaturated Soils: Research & Applications (137-142)

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)
Conference Proceeding
Murray, E., Toll, D., & Sivakumar, V. (2014). Interpretation of stresses and strains in unsaturated fine-grained soils. In N. Khalili, A. Russell, & A. Khoshghalb (Eds.), Unsaturated Soils: Research & Applications (197-201)

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.