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https://www.readbyqxmd.com/read/29132779/reliability-assessment-of-bioreactor-landfills-using-monte-carlo-simulation-and-coupled-hydro-bio-mechanical-model
#1
Krishna R Reddy, Girish Kumar, Rajiv K Giri, B Munwar Basha
The performance of a bioreactor landfill is highly influenced by the simultaneous interactions of several coupled processes that occur within the landfill. In addition, the high uncertainty and spatial variability in the geotechnical properties of municipal solid waste (MSW) poses significant challenge in accurately predicting the performance of bioreactor landfills. In this study, a 2D coupled hydro-bio-mechanical (CHBM) model was employed to predict the behavior of MSW in bioreactor landfills. The numerical model integrated a two-phase flow hydraulic model, a plane-strain formulation of Mohr-Coulomb constitutive model, and a first order decay biodegradation model...
November 10, 2017: Waste Management
https://www.readbyqxmd.com/read/29057847/time-series-uav-image-based-point-clouds-for-landslide-progression-evaluation-applications
#2
Abdulla Al-Rawabdeh, Adel Moussa, Marzieh Foroutan, Naser El-Sheimy, Ayman Habib
Landslides are major and constantly changing threats to urban landscapes and infrastructure. It is essential to detect and capture landslide changes regularly. Traditional methods for monitoring landslides are time-consuming, costly, dangerous, and the quality and quantity of the data is sometimes unable to meet the necessary requirements of geotechnical projects. This motivates the development of more automatic and efficient remote sensing approaches for landslide progression evaluation. Automatic change detection involving low-altitude unmanned aerial vehicle image-based point clouds, although proven, is relatively unexplored, and little research has been done in terms of accounting for volumetric changes...
October 18, 2017: Sensors
https://www.readbyqxmd.com/read/28964046/underwater-noise-from-geotechnical-drilling-and-standard-penetration-testing
#3
Christine Erbe, Craig McPherson
Geotechnical site investigations prior to marine construction typically involve shallow, small-core drilling and standard penetration testing (SPT), during which a small tube is hammered into the ground at the bottom of the borehole. Drilling (120 kW, 83 mm diameter drillbit, 1500 rpm, 16-17 m drill depth in sand and mudstone) and SPT (50 mm diameter test tube, 15 mm wall thickness, 100 kg hammer, 1 m drop height) by a jack-up rig in 7-13 m of water were recorded with a drifting hydrophone at 10-50 m range...
September 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28942188/study-of-a-tropical-soil-in-order-to-use-it-to-retain-aluminum-iron-manganese-and-fluoride-from-acid-mine-drainage
#4
Miriam Gonçalves Miguel, Rodrigo Paiva Barreto, Sueli Yoshinaga Pereira
The Ore Treatment Unit (UTM-Caldas), in the city of Caldas, Minas Gerais, Brazil, nowadays in decommissioning stage, was the first uranium extraction mine in Brazil. Several negative environmental impacts in the area have occurred, because of mining, treatment and beneficiation processes. Waste rock pile 4 (WRP-4) generates acid mine drainage (AMD), which is discharged in the Nestor Figueiredo retention pond (NFP). However, leakage of acid water by the NFP dam foundation has been constantly observed. Therefore, this research aimed to investigate a typical tropical soil, in order to use it as mineral liner for the NFP to minimize the leakage of acid water through the dam foundation and to retain predominant chemical species...
December 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28840495/comparison-of-conventional-and-bio-treated-methods-as-dust-suppressants
#5
Maryam Naeimi, Jian Chu
Dust is an environmental, geotechnical, health, and economical hazard. Fugitive dust emanating along transportation systems such as roads, railways, and airports especially can have significant impacts on health, safety, material loss, cost of maintenance, and interfere with the facilities. Quantitative studies on the effectiveness of the proper dust palliatives and their environmental impact have been studied with a number of biological and chemical methods. The objective of this study was to establish a method for using the microbial Induced calcium carbonate precipitation (MICP) approach to reduce the percent of mass loss against erosive force of wind regarding to the concentration and characteristics of aggregate used, climate, and traffic amounts...
October 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28774098/engineering-characteristics-of-chemically-treated-water-repellent-kaolin
#6
Youngmin Choi, Hyunwook Choo, Tae Sup Yun, Changho Lee, Woojin Lee
Water-repellent soils have a potential as alternative construction materials that will improve conventional geotechnical structures. In this study, the potential of chemically treated water-repellent kaolin clay as a landfill cover material is explored by examining its characteristics including hydraulic and mechanical properties. In order to provide water repellency to the kaolin clay, the surface of clay particle is modified with organosilanes in concentrations (CO) ranging from 0.5% to 10% by weight. As the CO increases, the specific gravity of treated clay tends to decrease, whereas the total organic carbon content of the treated clay tends to increase...
December 2, 2016: Materials
https://www.readbyqxmd.com/read/28773069/experimental-investigations-on-the-pull-out-behavior-of-tire-strips-reinforced-sands
#7
Li-Hua Li, Yan-Jun Chen, Pedro Miguel Vaz Ferreira, Yong Liu, Heng-Lin Xiao
Waste tires have excellent mechanical performance and have been used as reinforcing material in geotechnical engineering; however, their interface properties are poorly understood. To further our knowledge, this paper examines the pull-out characteristics of waste tire strips in a compacted sand, together with uniaxial and biaxial geogrids also tested under the same conditions. The analysis of the results shows that the interlocking effect and pull-out resistance between the tire strip and the sand is very strong and significantly higher than that of the geogrids...
June 27, 2017: Materials
https://www.readbyqxmd.com/read/28764538/a-contactless-positioning-system-for-monitoring-discontinuities-in-three-dimensions-with-geological-and-geotechnical-applications
#8
Natalia Rinaldi-Montes, Matt Rowberry, Carlos Frontera, Ivo Baroň, Javier Garcés, Jan Blahůt, Raúl Pérez-López, Christos Pennos, Xavi Martí
In this paper, a contactless positioning system is presented which has been designed to monitor the kinematic behavior of mechanical discontinuities in three dimensions. The positioning system comprises a neodymium magnet, fixed on one side of a discontinuity, and a magnetoresistive sensing array, fixed on the opposing side. Each of the anisotropic magnetoresistive sensors in the sensing array records the magnetic field along three orthogonal directions. The positioning system intrinsically generates compact data packages which are transmitted effectively using a range of standard wireless telecommunication technologies...
July 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28669495/use-of-municipal-solid-waste-incineration-bottom-ashes-in-alkali-activated-materials-ceramics-and-granular-applications-a-review
#9
REVIEW
R V Silva, J de Brito, C J Lynn, R K Dhir
This paper presents a literature review on the incorporation of municipal solid waste incinerated bottom ash as raw material in several markets, other than those where it is conventionally used, such as geotechnical applications and road pavement construction. The main findings of an ample selection of experimental investigations on the use of the bottom ash as precursor of alkali-activated materials, as an adsorbent material for the removal of hazardous elements from wastewater and landfill gases, as soil replacement in agricultural activities, as partial or complete substitute of raw materials for the manufacture of ceramic-based products, as landfill cover and as biogas production enhancer, were gathered, collated and analysed...
June 29, 2017: Waste Management
https://www.readbyqxmd.com/read/28543228/scenario-evaluator-for-electrical-resistivity-survey-pre-modeling-tool
#10
Neil Terry, Frederick D Day-Lewis, Judith L Robinson, Lee D Slater, Keith Halford, Andrew Binley, John W Lane, Dale Werkema
Geophysical tools have much to offer users in environmental, water resource, and geotechnical fields; however, techniques such as electrical resistivity imaging (ERI) are often oversold and/or overinterpreted due to a lack of understanding of the limitations of the techniques, such as the appropriate depth intervals or resolution of the methods. The relationship between ERI data and resistivity is nonlinear; therefore, these limitations depend on site conditions and survey design and are best assessed through forward and inverse modeling exercises prior to field investigations...
November 2017: Ground Water
https://www.readbyqxmd.com/read/28467468/model-based-classification-of-cpt-data-and-automated-lithostratigraphic-mapping-for-high-resolution-characterization-of-a-heterogeneous-sedimentary-aquifer
#11
Bart Rogiers, Dirk Mallants, Okke Batelaan, Matej Gedeon, Marijke Huysmans, Alain Dassargues
Cone penetration testing (CPT) is one of the most efficient and versatile methods currently available for geotechnical, lithostratigraphic and hydrogeological site characterization. Currently available methods for soil behaviour type classification (SBT) of CPT data however have severe limitations, often restricting their application to a local scale. For parameterization of regional groundwater flow or geotechnical models, and delineation of regional hydro- or lithostratigraphy, regional SBT classification would be very useful...
2017: PloS One
https://www.readbyqxmd.com/read/28411319/fifty-year-spatiotemporal-analysis-of-landscape-changes-in-the-mont-saint-hilaire-unesco-biosphere-reserve-quebec-canada
#12
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
#13
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
#14
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...
December 2017: Environmental Technology
https://www.readbyqxmd.com/read/28112579/experimental-investigation-on-removal-of-suspended-particles-from-water-using-flax-fibre-geotextiles
#15
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...
December 2017: Environmental Technology
https://www.readbyqxmd.com/read/28091885/assessing-the-impact-of-preload-on-pyrite-rich-sediment-and-groundwater-quality
#16
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
#17
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...
May 2017: Waste Management
https://www.readbyqxmd.com/read/28058583/assessing-geotechnical-centrifuge-modelling-in-addressing-variably-saturated-flow-in-soil-and-fractured-rock
#18
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...
May 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
#19
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
#20
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
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