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1.
Liner design for waste disposal sites 总被引：5，自引：0，他引：5
Since the beginning of the 1980s waste disposal has become a particularly sensitive issue. This has led to the development
of new legislations in the European Community and internationally which resulted in an array of regulations concerning landfill
liner design. This paper comments on different "engineered" containment methods with particular reference to landfill liner
design. Suggestions based on the review of the different methodologies are given and a case study is presented.
Received: 25 February 1997 · Accepted: 16 December 1997 相似文献
2.
Azeddine Guidoum Abdelmalek Nemouchi Abdelkader Hamlat 《Arabian Journal of Geosciences》2014,7(10):3925-3943
Aurès region remains one of the most exposed areas to water erosion phenomenon in Algeria, because of the strong climatic aggressiveness, the rugged relief, the predominance of sensitive land, and a vegetative cover that does not play its protective role. This article is a part of studies performed to protect agricultural and water infrastructure in this region. The main objective of this study is the cartographic modeling of an erosion hazard at the Oued Chemoura watershed, representative of the Aurès. The modeling approach uses a geographic information system and incorporates the following six factors controlling erosion: slope, friability of substrate, erodibility of soils, land cover, rainfall erosivity, and support practices. Result shows a synthetic map of the soil erosion hazard which locates the most threatened areas and priorities for possible planning interventions. A statistical study on the relationship solid–liquid flow was developed. Measurements conducted at the station of Chemoura, over the period 1969–1994, were exploited for this purpose. The results show a high specific degradation varying between 50 and 360 tons km?2 season?1. 相似文献
3.
Liu Han-long Wang Cheng-long Kong Gang-qiang Bouazza Abdelmalek 《Acta Geotechnica》2019,14(3):869-879
Acta Geotechnica - The influence of thermal loads on the ultimate bearing capacity of energy piles is examined. Five laboratory model tests were carried out to investigate piles equipped with... 相似文献
4.
A review of coal properties pertinent to carbon dioxide sequestration in coal seams: with special reference to Victorian brown coals 总被引：2，自引：1，他引：1
M. S. A. Perera P. G. Ranjith S. K. Choi A. Bouazza J. Kodikara D. Airey 《Environmental Earth Sciences》2011,64(1):223-235
This paper presents reviews of studies on properties of coal pertinent to carbon dioxide (CO2) sequestration in coal with specific reference to Victorian brown coals. The coal basins in Victoria, Australia have been
identified as one of the largest brown coal resources in the world and so far few studies have been conducted on CO2 sequestration in this particular type of coals. The feasibility of CO2 sequestration depends on three main factors: (1) coal mass properties (chemical, physical and microscopic properties), (2)
seam permeability, and (3) gas sorption properties of the coal. Firstly, the coal mass properties of Victorian brown coal
are presented, and then the general variations of the coal mass properties with rank, for all types of coal, are discussed.
Subsequently, coal gas permeability and gas sorption are considered, and the physical factors which affect them are examined.
In addition, existing models for coal gas permeability and gas sorption in coal are reviewed and the possibilities of further
development of these models are discussed. According to the previous studies, coal mass properties and permeability and gas
sorption characteristics of coals are different for different ranks: lignite to medium volatile bituminous coals and medium
volatile bituminous to anthracite coals. This is important for the development of mathematical models for gas permeability
and sorption behavior. Furthermore, the models have to take into account volume effect which can be significant under high
pressure and temperature conditions. Also, the viscosity and density of supercritical CO2 close to the critical point can undergo large and rapid changes. To date, few studies have been conducted on CO2 sequestration in Victorian brown coal, and for all types of coal, very few studies have been conducted on CO2 sequestration under high pressure and temperature conditions. 相似文献
5.
Ha H. Bui Jayantha K. Kodikara Abdelmalek Bouazza Asadul Haque Pathegama G. Ranjith 《国际地质力学数值与分析法杂志》2014,38(13):1321-1340
Segmental retaining wall (SRW) systems are commonly used in geotechnical practice to stabilize cut and fill slopes. Because of their flexibility, these systems can tolerate minor movements and settlements without incurring damage or crack. Despite these advantages, very few numerical studies of large deformations and post‐failure behavior of SRW systems are found in the current literature. Traditional numerical methods, such as the finite element method, suffer from mesh entanglement, thus are unable to simulate large deformations and flexible behavior of retaining wall blocks in SRW systems. To overcome the above limitations, a novel computational framework based on the smoothed particle hydrodynamics (SPH) method was developed to simulate large deformations and post‐failure behavior of soils and retaining wall blocks in SRW systems. The proposed numerical framework is a hybrid continuum/discontinuum approach that can model soil as an elasto‐plastic material and retaining wall blocks as independent rigid bodies associated with both translational and rotational degrees of freedom. A new contact model is proposed within the SPH framework to simulate the interaction between the soil and the blocks and between the blocks. As an application of the proposed numerical method, a two‐dimensional simulation of an SRW collapse was simulated and compared to experimental results conducted under the same conditions. The results showed that the proposed computational approach provided satisfactory agreement with the experiment. This suggests that the new framework is a promising numerical approach to model SRW systems. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
6.
Chouikh Nor-eddine Gillet Patrick Langston W. J. Cheggour Mohamed Maarouf Abdelmalek Mouabad Abdelfattah 《中国海洋湖沼学报》2020,38(1):143-155
Polychaetes are one of the most important groups of macrobenthic organisms in coastal and marine environments, in terms of diversity and abundance, and play an important role in the functioning of ecosystem. This study aims to describe the structure and spatial distribution of polychaete communities along Essaouira's rocky shoreline(Atlantic coast of Morocco) in relation to the major environmental variables such as granulometry, salinity, temperature, pH, and intertidal range. Twelve sites from these intertidal rocky shores were sampled using a quadrat method during the summer 2016. A total of 4 435 individuals belonging to 34 taxa were recorded. Among the families, Sabellaridae(24%) and Nereididae(23%) were ranked ?rst in terms of abundance of individuals. Sabellaria alveolata(24%) and Perinereis cultrifera(13%) were the dominant species. Diversity( H′) values varied from 2.28 to 3.95. Pielou's index( J′) varied between 0.62 and 0.89. This was essentially due to the low dominance of few species. Cluster analysis was used to characterise Essaouira's rocky shores on the basis of benthic polychaete communities. SIMPER analysis con?rmed the presence of three distinct communities. According to canonical correspondence analysis, the structure and distribution of faunal assemblages of benthic polychaetes was mainly related to topographical complexity, water temperature, hydrodynamic conditions and upwelling. We conclude that these rocky shores show typically high benthic polychaete diversity compared to the taxonomic list of other rocky coasts. In addition, these results constitute a baseline data for the development of a sustainable network for long-term monitoring of benthic polychaete community changes due to ecological factor in?uences and anthropogenic activity impacts. 相似文献
7.
Nathaniel Bensoussan Jean-Claude Romano Bouazza El-Haikali Michel-Guy Lafont 《Comptes Rendus Geoscience》2004,336(10):909-918
Semi-continuous (1/30 min) records of physicochemical parameters (T,S, DO and pH) have been measured at 1.50 m in Mediterranean coastal waters (Marseilles) from 1998 to 2000, together with meteorological parameters. Physicochemical data were studied in order to synthesise the information at different time scales (inter-annual, season, day, hour), particularly the semi-conservative DO and pH response to hydroclimatic variables. At a daily time scale, important circadian dynamic has been measured under all circumstances with a strong reactivity to irradiance change under the influence of biological activity. This work may contribute to the definition of new tools for coastal waters observation. To cite this article: N. Bensoussan et al., C. R. Geoscience 336 (2004). 相似文献
8.
Liu Han-long Wang Cheng-long Kong Gang-qiang Ding Xuan-ming Bouazza Abdelmalek 《Acta Geotechnica》2019,14(5):1605-1613
This paper introduces a simplified method to investigate the influence of thermal loads on the shaft friction and tip resistance of energy piles. The method is based on the influence factors (λ and η) which are back-calculated drawing on a large number of field and model tests. Values for λ and η during heating and cooling are suggested. Moreover, a new equation is proposed to calculate total shaft friction. The equations concerning the relationship between η and temperature difference are recommended to investigate the impacts of the thermal load on the pile tip resistance. The slope of the linear equation of an end-bearing pile is 2.14 times that of a floating pile indicating that the pile tip resistance of an end-bearing pile is much more affected by the same thermal load.
相似文献9.
10.
Hossam. M. Abuel-Naga Dennes. T. Bergado Abdelmalek Bouazza Michael. J. Pender 《Engineering Geology》2009,105(3-4):211-219
This paper presents the results of a study on the thermal conductivity of a soft saturated clay (Bangkok clay) carried out in relation to an investigation into using thermal treatment to enhance the consolidation process of soft soils. The thermal conductivity of clay specimens was measured in the laboratory using a steady state method (divided bar test) and a transient state method (needle probe test). In general, the laboratory test results show that the thermal conductivity increased with the increase in soil density. However, the needle probe test was found to yield greater thermal conductivities than those derived from the divided bar test. Furthermore, to assess the validity of the laboratory test results, the heat transfer results obtained from a full-scale embankment test that employed prefabricated vertical thermo-drains (PVTD) were simulated numerically using the laboratory determined thermal conductivity values. The numerical analysis indicates that the field thermal conductivity was close to the value obtained from the needle probe test. However, it was also found that the changes in thermal conductivity values obtained from the two laboratory methods did not impact significantly on heat flow behaviour, suggesting that the two methods are acceptable for characterizing the thermal conductivity of soils. 相似文献