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X-WR-CALNAME:Faculty of Science and Technology | University of Macau
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DTSTART:20140101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Macau:20140603T150000
DTEND;TZID=Asia/Macau:20140603T160000
DTSTAMP:20260528T094539
CREATED:20140602T040028Z
LAST-MODIFIED:20251125T032022Z
UID:16372-1401807600-1401811200@www.fst.um.edu.mo
SUMMARY:Instability and Failure in Granular Materials
DESCRIPTION:Speaker\nProf. Pierre-Yves HICHER\nProfessor of the Research Institute in Civil and Mechanical Engineering\nEcole Centrale de Nantes\, France \nAbstract\nInstability of granular material is an important topic in geotechnical engineering because it may lead to catastrophic events such as the collapse of earth structures. There are two aspects in the study of instability\, namely\, material instability (also known as intrinsic/constitutive instability) and geometrical instability. The phenomenon of localisation formation in a specimen of finite size can be studied as a boundary value problem for which initial inhomogeneities\, as well as boundary conditions\, play an important role. However\, it has been shown that the occurrence of localisation can be predicted at a constitutive level. More recently\, several authors have demonstrated that other modes of instability can occur within granular materials and demonstrated that any non-associated elastoplastic model could exhibit domains of instability inside the plastic limit. Experimental evidences support these theoretical approaches. For example\, in loose sand under undrained conditions\, an instable condition can be obtained at a low shear stress level and subsequently\, the strength is reduced to almost zero\, corresponding to a material state known as static liquefaction. In this talk\, we present a study of material instability based on laboratory testing and field cases. The analysis of these examples demonstrates the major role played by the material initial density as well as the loading conditions. \nBiography\nProfessor Pierre-Yves Hicher is currently a Professor of exceptional rank at the Research Institute in Civil and Mechanical Engineering\, Ecole Centrale de Nantes\, France. Professor Hicher worked in Ecole Centrale de Paris from 1974 to 1993. During this period\, he received PhD degree at Ecole Centrale de Paris in 1979\, and then promoted to assistant professor in 1981 and associate professor in 1983. He joined Ecole Centrale de Nantes as a full Professor in 1996. \nProfessor Hicher is the President of the Scientific Council of Ecole Centrale de Nantes. He is a member of the Executive Council of the PGCE (Civil Engineering and Eco-construction Network)\, Chairman of the Granular Materials Committee of ASCE\, Associate Editor of the Journal of Engineering Mechanics (ASCE)\, Member of the editorial board of the European Journal of Environmental and Civil Engineering\, Expert for the Ministry of High Education and Research (AERES\, ANR\, PES). He is the reviewer for a number of international journals\, including J. Eng. Mechanics ASCE\, Eur. J. of Mechanics\, Int. J. Num. Anal. Methods in Geomechanics\, Geotechnique\, ASTM Geotechnical Testing J.\, Canadian Geot. J.\, Computers and Geotchnics\, European Journal of Environmental and Civil Engineering\, Granular Matter and J Aerospace Eng. Professor Hicher has published more than 60 international journal papers and 8 books. He has supervised 38 PhD students in the fields of soil mechanics\, foundation engineering\, granular materials\, constitutive modelling and numerical modeling.
URL:https://www.fst.um.edu.mo/event/instability-and-failure-in-granular-materials/
LOCATION:J215 (University of Macau)
CATEGORIES:cee_events
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DTSTART;TZID=Asia/Macau:20140623T150000
DTEND;TZID=Asia/Macau:20140623T160000
DTSTAMP:20260528T094539
CREATED:20140620T040023Z
LAST-MODIFIED:20251125T032022Z
UID:16374-1403535600-1403539200@www.fst.um.edu.mo
SUMMARY:Modelling of Influence of Matric Suction Induced by Native Vegetation on Ground Behaviour
DESCRIPTION:Speaker\nDr. Behzad FATAHI\nSenior Lecturer of Geotechnical and Railway Engineering\,\nCentre for Built Infrastructure Research (CBIR)\,\nUniversity of Technology Sydney (UTS)\, Sydney\, Australia \nAbstract\nBioengineering including native vegetation is an ancient method of improving the stability of slopes. In modern railway engineering\, this technique is re-captured for increasing the soil stiffness and shear strength of sub-grade beneath rail tracks. Tree roots provide three stabilising functions: (a) reinforcement of the soil\, (b) dissipation of excess pore pressures and (c) establishing sufficient matric suction to increase the shear strength.The main focus of this presentation will on investigating the effects of vegetation on soil matric suction\, ground settlement and lateral movement (radial consolidation). A mathematical model developed for the rate of root water uptake based on the root growth rate and considering ground conditions\, type of vegetation and climatic parameters\, is presented. A two dimensional finite element approach based on ABAQUS has been employed to solve the transient coupled flow and deformation equations incoporating the proposed root water uptake model as a subroutine. To validate the model\, an array of field measurements conducted at Miram site in Victoria\, Australia are presented. In addition\, the action of two rows of trees on improving the soil behaviour under railway or road embanklments are compared to a vertical drain with applied suction (vacuum pressure). \nBiography\nDr. Fatahi has worked as a consulting and site geotechnical and railway engineer and has completed doctorate studies in Soft Soil Geomechanics from the University of Wollongong in Australia. He was a part of very strong geotechnical design teams in several alliance projects around Australia mainly on road and highway construction/upgrade and was involved in forensic and confidential projects for mining sector in Australia while working in Coffey International (Sydney Office). He worked as a full-time researcher for Rail-CRC conducting research to improve performance of rail tracks built on soft soils to minimise the maintenance costs. Behzad has immensely contributed to the idea of green corridors for railway lines. Dr. Fatahi was named ‘Australasia Young Railway Engineer of Year 2007’ by Engineers Australia and Railway Technical Society of Australasia. Behzad was also awarded the first prize at the Young Geotechnical Professional’s Night in 2006\, which is a prestigious geomechanics award from the Australian Geomechanics Society and Engineers Australia. He is currently a senior lecturer of Geotechnical and Railway Engineering at the University of Technology Sydney (UTS) leading several large research projects funded by the Australian Research Council and key engineering companies in the field of soft soil engineering and ground improvement\, and supervising numerous PhD students.
URL:https://www.fst.um.edu.mo/event/modelling-of-influence-of-matric-suction-induced-by-native-vegetation-on-ground-behaviour/
LOCATION:J215 (University of Macau)
CATEGORIES:cee_events
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