ORCID Profile
0000-0001-7535-8750
Current Organisation
Northumbria University
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Publisher: Springer Science and Business Media LLC
Date: 02-2018
Publisher: Springer International Publishing
Date: 18-08-2022
Publisher: Canadian Science Publishing
Date: 09-2022
Abstract: High capacity tensiometers (HCT) are the only type of sensors in existence that can measure soil matric suction directly and are regarded to be the most accurate and reliable technique for the study of suction evolution in unsaturated soils. The measurement with HCTs is possible due to their design, composed of ceramic filter with a specific air entry value (AEV), small water reservoir, and pressure transducer. Where, the AEV of the ceramic filter, more precisely the largest pore size within the ceramic, plays the most important role in controlling the measuring range of HCTs. Specifically, decreasing the largest pore size within the ceramic results in an increase in the measuring range. In this work, a new development in HCTs is presented whereby the ceramic filter in HCTs was replaced from the typically used 1.5 MPa AEV ceramic filter with a new alumina ceramic filter with an estimated AEV of 3.5 MPa. To assess the performance of the new ceramic filter, similar designed HCTs were assembled with the Soilmoisture Equipment Corp. 1.5 MPa AEV and the new alumina ceramic filters. Early results show that the maximum measuring matric suction range is beyond 3 MPa for HCTs assembled with the new alumina ceramic filter.
Publisher: Springer Nature Switzerland
Date: 2023
Publisher: Elsevier BV
Date: 12-2020
Publisher: EDP Sciences
Date: 2016
Publisher: Elsevier BV
Date: 09-2023
Publisher: Geological Society of London
Date: 2012
DOI: 10.1144/EGSP26.17
Publisher: Springer Science and Business Media LLC
Date: 27-03-2019
Publisher: Springer Berlin Heidelberg
Date: 2012
Publisher: EDP Sciences
Date: 2016
Publisher: Elsevier BV
Date: 11-2022
Publisher: EDP Sciences
Date: 2016
Publisher: Springer Science and Business Media LLC
Date: 13-05-2014
Publisher: CRC Press
Date: 14-10-2015
DOI: 10.1201/B19248-4
Publisher: American Society of Civil Engineers
Date: 20-06-2018
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2016
Publisher: EDP Sciences
Date: 2016
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 27-03-2017
Publisher: Thomas Telford Ltd.
Date: 06-2009
DOI: 10.1680/ENSU.2009.162.2.67
Abstract: A unique facility for engineering and biological research has been established with the aim of improving fundamental understanding of the effects of climate change on slopes. This paper describes the building and monitoring of a full-scale embankment representative of UK infrastructure, the planting and monitoring of representative vegetation, and the construction of a system of sprinklers and covers to control climate. A summary of the results of the first experiments simulating predicted future UK climate and the response of the embankment is also presented. The information that has begun to be gathered is providing data related to the failure modes anticipated as a result of climate change and hence on the sustainability of UK infrastructure slopes.
Publisher: Elsevier BV
Date: 02-2020
Publisher: Springer Science and Business Media LLC
Date: 27-01-2017
Publisher: Canadian Science Publishing
Date: 06-2022
Abstract: This paper presents the results from a c aign of unsaturated and saturated isotropic tests performed on two compacted silts of different coarseness, namely a clayey silt and a sandy silt, inside triaxial cells. Some tests involved an increase or a decrease of mean net stress at constant suction or an increase or a decrease of suction at constant mean net stress. Other tests involved an increase of mean net stress at constant water content with measurement of suction. During all tests, the void ratio and degree of saturation were measured to investigate the mechanical and retention behaviour of the soil. The experimental results were then simulated by the bounding surface hydromechanical model of A.W. Bruno and D. Gallipoli (2019. Computers and Geotechnics, 110: 287–295. doi:10.1016/j.compgeo.2019.02.025), which was originally formulated to describe the behaviour of clays and clayey silts. Model parameters were calibrated against unsaturated tests including isotropic loading stages at constant water content with measurement of varying suction. Loading at constant water content is relatively fast and allows the simultaneous exploration of large ranges of mean net stress and suction, thus reducing the need of multiple experiments at distinct suction levels. Predicted data match well the observed behaviour of both soils, including the occurrence of progressive yielding and hysteresis, which extends the validation of this hydromechanical model to coarser soils. Specific features of the unsaturated soil behaviour, such as wetting-induced collapse, are also well reproduced.
Publisher: Elsevier BV
Date: 09-2017
Publisher: Thomas Telford Ltd.
Date: 06-2019
Abstract: Tensiometers are increasingly used in geotechnical engineering to monitor pore-water tension in the field and to study the hydro-mechanical behaviour of unsaturated soils in the laboratory. Early tensiometers exhibited a relatively small measuring range, typically limited to a tension of 0·1 MPa, due to the breakdown of water tension inside the sensing unit at absolute negative pressures. This limitation was subsequently overcome by the design of high-capacity tensiometers (HCTs), which enabled the measurement of considerably larger pore-water tensions. According to the literature, the highest value of water tension ever recorded by an HCT is 2·6 MPa. In the present work, this value is almost tripled by designing a novel ultra-high-capacity tensiometer (UHCT) capable of recording water tensions up to 7·3 MPa. This is achieved by replacing the traditional ceramic interface with a nanoporous glass (typically employed by physicists for the study of confined liquids), which has never been used before in the manufacture of tensiometers. The maximum attainable tension has been determined using tests where the UHCT measurement was progressively increased by vaporising water from the glass interface until the occurrence of tension breakdown (often referred to as ‘heterogeneous cavitation’ or ‘tensiometer cavitation’). The increased measuring range and the potentially larger measuring stability of the proposed UHCT will contribute to enhance laboratory testing of soils at high suctions and long-term monitoring of earth structures.
Location: Portugal
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Joao Mendes.