D. G. Toll
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View article: Interdisciplinary perspectives on the intersections of roads, sustainable development, and disaster resilience
Interdisciplinary perspectives on the intersections of roads, sustainable development, and disaster resilience Open
Natural hazard-influenced disasters, sustainable development, and roads are closely intertwined. Governments and funding agencies worldwide are increasingly focused on delivering disaster-resilient road infrastructure. However, the multifa…
View article: A participatory approach to determine the use of road cut slope design guidelines in Nepal to lessen landslides
A participatory approach to determine the use of road cut slope design guidelines in Nepal to lessen landslides Open
Road cut slope failures are a type of landslide process and are extensive across the road network of Nepal. In response to the pressing need for improved road cut slope design guidelines to help prevent these failures, this study employs a…
View article: Deterioration of a compacted soil due to suction loss and desiccation cracking
Deterioration of a compacted soil due to suction loss and desiccation cracking Open
This paper presents the results of laboratory testing of a clayey soil taken from a road subgrade in Tanzania. The results revealed a reduction in the soil water retention capacity, accompanied by shifts in the water retention curves with …
View article: A participatory approach to determine the use of road cut slope design guidelines in Nepal to lessen landslides
A participatory approach to determine the use of road cut slope design guidelines in Nepal to lessen landslides Open
Road cut slope failures are a type of landslide process and are extensive across the road network of Nepal. In response to the pressing need for improved road cut slope design guidelines to help prevent these failures, this study employs a…
View article: Preliminary assessment of series of landslides and related damage by heavy rainfall in Himachal Pradesh, India, during July 2023
Preliminary assessment of series of landslides and related damage by heavy rainfall in Himachal Pradesh, India, during July 2023 Open
Himachal Pradesh, a northern state of India, experienced unprecedented heavy rainfall between 31 July 7-14, 2023, recording a daily average rainfall level that was 436% higher than the normal 32 daily monsoonal average.This period of heavy…
View article: Soil–Water Retention Curve Prediction for Compacted London Clay Subjected to Moisture Cycles
Soil–Water Retention Curve Prediction for Compacted London Clay Subjected to Moisture Cycles Open
The evolution of the hydraulic properties of London Clay when compacted at a range of initial conditions (density and water content) was investigated. The soil–water retention curve (SWRC) is observed to change as the soil is subjected to …
View article: A simple method to determine soil–water retention curves of compacted active clays
A simple method to determine soil–water retention curves of compacted active clays Open
Determining the Soil Water Retention Curve (SWRC) of an active clay constitutes a challenge due to the significant, and sometimes irreversible, volume changes that occur during wetting and drying cycles. A novel yet simple method of experi…
View article: An Apparatus to Monitor Suction Evolution and Water Migration within a Soil Mass for Climate-Adaptive Infrastructure
An Apparatus to Monitor Suction Evolution and Water Migration within a Soil Mass for Climate-Adaptive Infrastructure Open
The present study investigates the potential utility of a capillary barrier system that limits water infiltration into the underlying soil. This was achieved by developing a cylindrical apparatus capable of monitoring matric suction and wa…
View article: An Evolutionary Neural Network Approach for Slopes Stability Assessment
An Evolutionary Neural Network Approach for Slopes Stability Assessment Open
A current big challenge for developed or developing countries is how to keep large-scale transportation infrastructure networks operational under all conditions. Network extensions and budgetary constraints for maintenance purposes are amo…
View article: High Capacity Tensiometers: performance and behaviours
High Capacity Tensiometers: performance and behaviours Open
High capacity tensiometers (HCT) allow the direct measurement of soil matric suction, and their major limitation is the occurrence of cavitation. In this paper HCT designs using different ceramic filters with varied air entry values (AEV),…
View article: Irreversible effects of drying-wetting cycles on shrinkage and water retention of compacted London clay
Irreversible effects of drying-wetting cycles on shrinkage and water retention of compacted London clay Open
Long-linear assets, such as roads and railways, supported by earthworks are susceptible to deterioration caused by weather cycles, that translate into changes in soil hydro-mechanical properties. Failures in these earthworks are expected t…
View article: Centrifuge modelling of an expansive clay profile using artificial fissuring to accelerate swell
Centrifuge modelling of an expansive clay profile using artificial fissuring to accelerate swell Open
This paper presents the results of a centrifuge study in which swell of an expansive clay profile was induced in the centrifuge. A factor which has previously hindered such research is the time required to induce significant swell in-fligh…
View article: The bounding effect of the water retention curve on the cyclic response of an unsaturated soil
The bounding effect of the water retention curve on the cyclic response of an unsaturated soil Open
The water retention properties of soils present in formation layers of roads and railways continuously vary due to repeated traffic loads and periodic rainfall events. This is important because the accumulated deformation and resilient mod…
View article: An investigation of the combined effect of rainfall and road cut on landsliding
An investigation of the combined effect of rainfall and road cut on landsliding Open
The reduction of soil suction and consequent loss of shear strength due to infiltration is known to trigger shallow landslides during periods of concentrated rainfall. In the mountainous terrain of Nepal, the risk of shallow rainfall-induc…
View article: Reusing Fe water treatment residual as a soil amendment to improve physical function and flood resilience
Reusing Fe water treatment residual as a soil amendment to improve physical function and flood resilience Open
Soil degradation is a global challenge that is intrinsically linked to climate change and food security. Soil degradation has many causes, but all degraded soils suffer from poor soil structure. The increasing global production of water tr…
View article: Protecting Geo-Infrastructure from Climate Change
Protecting Geo-Infrastructure from Climate Change Open
We are facing a climate emergency, with significant changes in weather patterns and more extreme weather events, both storms and drought.These changes can have significant deleterious effects on our geotechnical infrastructure.While intens…
View article: The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil
The Influence of Cyclic Loading Frequency on the Response of an Unsaturated Railway Formation Soil Open
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…
View article: Coupling cyclic and water retention response of a clayey sand subjected to traffic and environmental cycles
Coupling cyclic and water retention response of a clayey sand subjected to traffic and environmental cycles Open
Compacted soils used as formation layers of railways and roads continuously undergo water content and suction changes due to seasonal variations. Such variations, together with the impact of cyclic traffic-induced loads, can alter the hydr…
View article: Comment on soil-2021-94
Comment on soil-2021-94 Open
Abstract. Soil degradation is a global challenge that is intrinsically linked to climate change and food security. Soil degradation has many causes, but all degraded soils suffer from poor soil structure. The increasing global production o…
View article: Reply on AC1
Reply on AC1 Open
Abstract. Soil degradation is a global challenge that is intrinsically linked to climate change and food security. Soil degradation has many causes, but all degraded soils suffer from poor soil structure. The increasing global production o…
View article: Rainfall-Induced Deformation on Unsaturated Collapsible Soils
Rainfall-Induced Deformation on Unsaturated Collapsible Soils Open
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 unsat…
View article: Reusing Fe water treatment residual as a soil amendment to improve physical function and flood resilience
Reusing Fe water treatment residual as a soil amendment to improve physical function and flood resilience Open
Soil degradation is a global challenge that is intrinsically linked to climate change and food security. Soil degradation has many causes, but all degraded soils suffer from poor soil structure. The UN’s Sustainable Development Goals 12, 1…
View article: Additional Data for "Advanced analysis of satellite data reveals ground deformation precursors to the Brumadinho Tailings Dam collapse".
Additional Data for "Advanced analysis of satellite data reveals ground deformation precursors to the Brumadinho Tailings Dam collapse". Open
1. ISBAS InSAR time-series data for locations on the Brumadinho tailings dam. 2. Brumadinho tailings dam failure prediction data. 3. Daily rainfall data for the Cercadinho-F501 meteorological station. 4. Daily rainfall data for the Rola Mo…