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Hadjadj Fatima Zohra Laredj Nadia Maliki Mustapha Missoum Hanifi 《Geotechnical and Geological Engineering》2022,40(8):4159-4170
Geotechnical and Geological Engineering - The improvement of salt affected lands is a major environmental challenge in arid and semi arid regions all over the world. Electrokinetic treatment is one... 相似文献
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Greenhouse gas emissions, energy security and sustainability are three of the greatest contemporary global challenges to mankind today. The Sino-German Group of scientists have composed a special issue, which is a collection of diverse quality scientific works, that will try to elucidate the current developments in CO2 geologic sequestration research to reduce greenhouse emission including measures to monitor surface leakage, groundwater quality and the integrity of caprock, while ensuring a sufficient supply of clean energy. 相似文献
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Nadia Laredj Hanifi Missoum Karim Bendani Mustapha Maliki 《Arabian Journal of Geosciences》2011,5(5):935-942
Knowledge of transport processes of heat and moisture in soils of arid zones is vital to understanding the environmental and economic impacts of many activities: agriculture, waste disposal, geoenvironmental practices and earth sciences. Through extensive review and study on the different aspects of coupled transfer processes in swelling porous media, a general mathematical model for coupled heat, moisture, air flow and deformation problems in clayey soils is proposed in a consistent and unified manner. The model is characterized by the presence of a deformable solid matrix filled with two fluid phases (liquid water and air). In the proposed model, both pore water and air transfers are assumed to be governed by the generalized Darcy’s law. Fully coupled, non-linear partial differential equations are established and then solved by using a Galerkin weighted residual approach in space domain and an implicit integrating scheme in time domain. The obtained model has been finally validated by means of some case tests for the prediction of the thermo-hydro-mechanical behaviour of unsaturated swelling soils. The calculated relative errors between experimental and numerical results are 3% for temperature and 7% for stresses. Consequently, the developed numerical model predicts satisfactory results, compared to experimental test measures. The model is applicable to two-dimensional problems with various initial and boundary conditions; non-linear soil parameters can be easily included in this model. 相似文献
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Recent developments in the application of x-ray micro-tomography in laboratory geomechanics have allowed all the individual
grains of sand in a test sample to be seen and identified uniquely in 3D. Combining such imaging capabilities with experiments
carried out “in situ” within an imaging set-up has led to the possibility of directly observing the mechanisms of deformation
as they happen. The challenge has thus become extracting pertinent, quantified information from these rich time-lapse 3D images
to elucidate the mechanics at play. This paper presents a new approach (ID-Track) for the quantification of individual grain
kinematics (displacements and rotations) of large quantities of sand grains (tens of thousands) in a test sample undergoing
loading. With ID-Track, grains are tracked between images based on some geometrical feature(s) that allow their unique identification
and matching between images. This differs from Digital Image Correlation (DIC), which makes measurements by recognising patterns
between images. Since ID-Track does not use the image of a grain for tracking, it is significantly faster than DIC. The technique
is detailed in the paper, and is shown to be fast and simple, giving good measurements of displacements, but suffering in
the measurement of rotations when compared with Discrete DIC. Subsequently, results are presented from successful applications
of ID-track to triaxial tests on two quite different sands: the angular Hostun sand and the rounded Caicos Ooids. This reveals
details on the performance of the technique for different grain shapes and insight into the differences in the grain-scale
mechanisms occurring in these two sands as they exhibit strain localisation under triaxial loading. 相似文献
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