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https://www.readbyqxmd.com/read/28411319/fifty-year-spatiotemporal-analysis-of-landscape-changes-in-the-mont-saint-hilaire-unesco-biosphere-reserve-quebec-canada
#1
Marc Béliveau, Daniel Germain, Ana-Neli Ianăş
Diachronic analysis with a GIS-based classification of land-use changes based on aerial photographs, orthophotos, topographic maps, geotechnical reports, urban plans, and using landscape metrics has permitted insight into the driving forces responsible for landscape fragmentation in the Mont Saint-Hilaire (MSH) Biosphere Reserve over the period 1958-2015. Although the occurrence of exogenous factors, such as extreme weather and fires, can have a significant influence on the fragmentation of the territory in time and space, the accelerated development of the built environment (+470%) is nevertheless found to be primarily responsible for landscape fragmentation and the loss of areas formerly occupied by orchards, agriculture, and woodlands...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28245551/fbg-based-monitoring-of-geohazards-current-status-and-trends
#2
REVIEW
Hong-Hu Zhu, Bin Shi, Cheng-Cheng Zhang
In recent years, natural and anthropogenic geohazards have occured frequently all over the world, and field monitoring is becoming an increasingly important task to mitigate these risks. However, conventional geotechnical instrumentations for monitoring geohazards have a number of weaknesses, such as low accuracy, poor durability, and high sensitivity to environmental interferences. In this aspect, fiber Bragg grating (FBG), as a popular fiber optic sensing technology, has gained an explosive amount of attention...
February 24, 2017: Sensors
https://www.readbyqxmd.com/read/28118789/geotechnical-and-mineralogical-characterisations-of-marine-dredged-sediments-before-and-after-stabilisation-to-optimise-their-use-as-a-road-material
#3
L Saussaye, E van Veen, G Rollinson, M Boutouil, J Andersen, J Coggan
Dredging activities to extend, deepen and maintain access to harbours generate significant volumes of waste dredged material. Some ways are investigated to add value to these sediments. One solution described here is their use in road construction following treatment with hydraulic binders. This paper presents the characterisation of four sediments, in their raw state and after 90 days of curing following stabilisation treatment with lime and cement, using a combination of novel and established analytical techniques to investigate subsequent changes in mineralogy...
February 15, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28112579/experimental-investigation-on-removal-of-suspended-particles-from-water-using-flax-fibre-geotextiles
#4
Bouamama Abbar, Abdellah Alem, Anne Pantet, Stéphane Marcotte, Nasre-Dine Ahfir, Davy Duriatti
Natural geotextiles are increasingly used in geotechnical applications such as bank protection and short-term soil reinforcement. This study aimed to highlight the behaviour of natural flax fibre geotextiles towards the retention of suspended particles (SP) present in urban runoff and often polluted. Indeed, it is well known that a large fraction of the heavy metals are often associated with the SP. Long-term filtration tests were performed on four laboratory filter designs. The objective was to study the influence of a nonwoven flax fibre geotextiles on SP transfer through a sandy porous media under saturated conditions...
February 5, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28091885/assessing-the-impact-of-preload-on-pyrite-rich-sediment-and-groundwater-quality
#5
Ohene Karikari-Yeboah, Jonas Addai-Mensah
Pyrite-rich sediments would, invariably, undergo redox reactions which would lead to acidic aqueous environment containing solubilized toxic metal species. When such sediments are subjected to preload, a technique employed by geotechnical engineers to improve the load-bearing capacity of highly compressible formation, transient flow of pore water, accompanied by acidity transfer, would occur as a response. Despite the concomitant environmental and socio-economic significance, to date, there has been limited interdisciplinary research on the underpinning geotechnical engineering and geo-environmental science issues for pyrite-rich sediments under preload...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28062150/influence-of-dynamic-coupled-hydro-bio-mechanical-processes-on-response-of-municipal-solid-waste-and-liner-system-in-bioreactor-landfills
#6
Krishna R Reddy, Girish Kumar, Rajiv K Giri
A two-dimensional (2-D) mathematical model is presented to predict the response of municipal solid waste (MSW) of conventional as well as bioreactor landfills undergoing coupled hydro-bio-mechanical processes. The newly developed and validated 2-D coupled mathematical modeling framework combines and simultaneously solves a two-phase flow model based on the unsaturated Richard's equation, a plain-strain formulation of Mohr-Coulomb mechanical model and first-order decay kinetics biodegradation model. The performance of both conventional and bioreactor landfill was investigated holistically, by evaluating the mechanical settlement, extent of waste degradation with subsequent changes in geotechnical properties, landfill slope stability, and in-plane shear behavior (shear stress-displacement) of composite liner system and final cover system...
January 3, 2017: Waste Management
https://www.readbyqxmd.com/read/28058583/assessing-geotechnical-centrifuge-modelling-in-addressing-variably-saturated-flow-in-soil-and-fractured-rock
#7
Brendon R Jones, Luke B Brouwers, Warren D Van Tonder, Matthys A Dippenaar
The vadose zone typically comprises soil underlain by fractured rock. Often, surface water and groundwater parameters are readily available, but variably saturated flow through soil and rock are oversimplified or estimated as input for hydrological models. In this paper, a series of geotechnical centrifuge experiments are conducted to contribute to the knowledge gaps in: (i) variably saturated flow and dispersion in soil and (ii) variably saturated flow in discrete vertical and horizontal fractures. Findings from the research show that the hydraulic gradient, and not the hydraulic conductivity, is scaled for seepage flow in the geotechnical centrifuge...
January 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28004349/geotechnical-assessment-of-road-failure-and-slope-monitoring-along-nsukka-adoru-idah-highway-southeastern-nigeria
#8
Raphael Iweanya Maduka, Ogbonnaya Igwe, Nnadozie Onyekachi Ayogu, Chinero Nneka Ayogu, Martin Nwachukwu
The quality of highway pavement is greatly influenced by the subgrade materials, the general geology of the area, and the materials used for construction. Investigation into the 75-km Nsukka-Adoru-Idah highway revealed that the pavement was underlain by three lithological units-Imo, Nsukka, and Ajali formations. The geotechnical evaluation carried out in the study includes the particle size distribution, Atterberg limit, specific gravity, compaction tests, and California bearing ratio (CBR). The base course has clay/silt (7-14%), fine sand (1-4%), medium sand (6-13%), and coarse sand (65-86%), while the subgrade presented clay/silt (74-82%), fine sand (6-9%), medium sand (10-17%), and coarse sand (1-3%)...
January 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27981466/multiple-geophysical-surveys-for-old-landfill-monitoring-in-singapore
#9
Ke Yin, Huanhuan Tong, Apostolos Giannis, Jing-Yuan Wang, Victor W-C Chang
One-dimensional boring presents limitations on mapping the refuse profile in old landfills owning to waste heterogeneity. Electrical imaging (EI) and multiple-analysis of surface wave (MASW) were hereby deployed at an old dumping ground in Singapore to explore the subsurface in relation to geotechnical analysis. MASW estimated the refuse boundary with a higher precision as compared to EI, due to its endurance for moisture variation. EI and MASW transection profiles suggested spots of interest, e.g., refuse pockets and leachate mounds...
January 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27888372/effect-of-oil-pollution-on-function-of-sandy-soils-in-protected-deserts-and-investigation-of-their-improvement-guidelines-case-study-kalmand-area-iran
#10
Mohammad Saberian, Mohammad Mehdi Khabiri
Soil pollution is one of the most dangerous sorts of environmental pollutions because of waste materials, fossil fuels, etc. Unfortunately in developing countries, there are very few arrangements to prevent soil pollution due to the fossil fuels and to improve polluted soil. In this research, influences of gas oil on properties of Kalmand protected area's sandy soil near Yazd, Iran, were studied. It was found that gas oil constituted 5.25% of soil weight in the refueling station in the region. Therefore, cleaning and strengthening of the soil by adding cement rather than expensive and complicated methods were the most important goals of this research...
November 25, 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/27882357/the-influence-of-delta-formation-mechanism-on-geotechnical-property-sequence-of-the-late-pleistocene-holocene-sediments-in-the-mekong-river-delta
#11
Truong Minh Hoang, Nguyen van Lap, Ta Thi Kim Oanh, Takemura Jiro
The aim of the study was to characterize a variety of microstructure development-levels and geotechnical property sequences of the late Pleistocene-Holocene deposits in the Mekong River delta (MRD), and the paper furthermore discusses the influences of delta formation mechanisms on them. The survey associated the geotechnical engineering and the sedimentary geology of the late Pleistocene-Holocene deposits at five sites and also undifferentiated Pleistocene sediments. A cross-section which was rebuilt in the delta progradation-direction and between the Mekong and Bassac rivers represents the stratigraphy...
November 2016: Heliyon
https://www.readbyqxmd.com/read/27827385/role-of-the-interface-between-distributed-fibre-optic-strain-sensor-and-soil-in-ground-deformation-measurement
#12
Cheng-Cheng Zhang, Hong-Hu Zhu, Bin Shi
Recently the distributed fibre optic strain sensing (DFOSS) technique has been applied to monitor deformations of various earth structures. However, the reliability of soil deformation measurements remains unclear. Here we present an integrated DFOSS- and photogrammetry-based test study on the deformation behaviour of a soil foundation model to highlight the role of strain sensing fibre-soil interface in DFOSS-based geotechnical monitoring. Then we investigate how the fibre-soil interfacial behaviour is influenced by environmental changes, and how the strain distribution along the fibre evolves during progressive interface failure...
November 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27798475/fractal-theory-and-field-cover-experiments-implications-for-the-fractal-characteristics-and-radon-diffusion-behavior-of-soils-and-rocks
#13
Wanyu Tan, Yongmei Li, Kaixuan Tan, Xianzhe Duan, Dong Liu, Zehua Liu
Radon diffusion and transport through different media is a complex process affected by many factors. In this study, the fractal theories and field covering experiments were used to study the fractal characteristics of particle size distribution (PSD) of six kinds of geotechnical materials (e.g., waste rock, sand, laterite, kaolin, mixture of sand and laterite, and mixture of waste rock and laterite) and their effects on radon diffusion. In addition, the radon diffusion coefficient and diffusion length were calculated...
December 2016: Health Physics
https://www.readbyqxmd.com/read/27791485/interrelationships-among-geotechnical-and-leaching-properties-of-a-cement-stabilized-contaminated-soil
#14
Reginald B Kogbara
Relationships among selected performance properties have been established using experimental data from a cement-stabilized mixed contaminated soil. The sandy soil was spiked with 3,000 mg/kg each of Cd, Cu, Pb, Ni and Zn, and 10,000 mg/kg of diesel. It was then treated with 5%, 10%, 15%, and 20% dosages of Portland cement. Different water contents were considered for lower dosage mixes. Selected geotechnical and leaching properties were determined on 28-day old samples. These include unconfined compressive strength (UCS), bulk density, porosity, hydraulic conductivity, leachate pH and granular leachability of contaminants...
January 28, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/27770323/environmental-characterisation-of-sewage-sludge-paper-ash-based-composites-in-relation-to-their-possible-use-in-civil-engineering
#15
Ana Mladenovič, Sandra Hamler, Nina Zupančič
The environmental acceptability of geotechnical composites made of treated municipal sewage sludge (SwS) and paper ash (PA) after two different curing periods has been investigated. The mineral composition of such composites, including their content of major oxides, is mainly influenced by the PA. The content of potentially toxic elements (PTEs) in the initial materials and in the composites varies considerably. In the SwS the Ba, Cd, Cr, Cu, Hg, Ni and Zn contents are above the legally permitted limits. The PTE content of PA are lower, but still somewhat above the permitted values for Ba and Cu...
January 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27684989/effect-of-fly-ash-on-properties-of-crushed-brick-and-reclaimed-asphalt-in-pavement-base-subbase-applications
#16
Alireza Mohammadinia, Arul Arulrajah, Suksun Horpibulsuk, Avirut Chinkulkijniwat
Fly Ash (FA), an abundant by-product with no carbon footprint, is a potential stabilizer for enhancing the physical and geotechnical properties of pavement aggregates. In this research, FA was used in different ratios to stabilize crushed brick (CB) and reclaimed asphalt pavement (RAP) for pavement base/subbase applications. The FA stabilization of CB and RAP was targeted to improve the strength and durability of these recycled materials for pavement base/subbase applications. The Unconfined Compressive Strength (UCS) and resilient modulus (MR) development of the stabilized CB and RAP aggregates was studied under room temperature and at an elevated temperatures of 40°C, and results compared with unbound CB and RAP...
September 18, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27659867/geotechnical-properties-of-municipal-solid-waste-at-laogang-landfill-china
#17
Shi-Jin Feng, Ke-Wei Gao, Yi-Xin Chen, Yao Li, L M Zhang, H X Chen
Landfills have been widely constructed all around the world in order to properly dispose municipal solid waste (MSW). Understanding geotechnical properties of MSW is essential for the design and operation of landfills. A comprehensive investigation of geotechnical properties of MSW at the largest landfill in China was conducted, including waste composition, unit weight, void ratio, water content, hydraulic conductivity, and shear behavior. A large-scale rigid-wall permeameter and a direct-shear apparatus were adopted to test the hydraulic conductivity and shear behavior of the MSW, respectively...
September 19, 2016: Waste Management
https://www.readbyqxmd.com/read/27612617/the-suitability-evaluation-of-dredged-soil-from-reservoirs-as-embankment-material
#18
Jaesung Park, Younghwan Son, Sookack Noh, Taeho Bong
We assessed the suitability of soil dredged from reservoirs as embankment material and investigated its physical and geochemical properties and strength parameters, as well as its environmental stability. The dredged soil samples were taken from the Ansung, Jechon, and Mulwang Reservoirs in Korea. To evaluate their environmental stability and geochemical properties, we examined their levels of heavy metal contamination, pH, and electrical conductivity. We also conducted X-ray fluorescence and X-ray diffraction analyses...
December 1, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27447630/kalman-filters-in-geotechnical-monitoring-of-ground-subsidence-using-data-from-mems-sensors
#19
Cheng Li, Rafig Azzam, Tomás M Fernández-Steeger
The fast development of wireless sensor networks and MEMS make it possible to set up today real-time wireless geotechnical monitoring. To handle interferences and noises from the output data, Kalman filter can be selected as a method to achieve a more realistic estimate of the observations. In this paper, a one-day wireless measurement using accelerometers and inclinometers was deployed on top of a tunnel section under construction in order to monitor ground subsidence. The normal vectors of the sensors were firstly obtained with the help of rotation matrices, and then be projected to the plane of longitudinal section, by which the dip angles over time would be obtained via a trigonometric function...
2016: Sensors
https://www.readbyqxmd.com/read/27247870/deformation-behaviors-of-peat-with-influence-of-organic-matter
#20
Min Yang, Kan Liu
Peat is a kind of special material rich in organic matter. Because of the high content of organic matter, it shows different deformation behaviors from conventional geotechnical materials. Peat grain has a non-negligible compressibility due to the presence of organic matter. Biogas can generate from peat and can be trapped in form of gas bubbles. Considering the natural properties of peat, a special three-phase composition of peat is described which indicates the existence of organic matter and gas bubbles in peat...
2016: SpringerPlus
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