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F. Masrouri - One of the best experts on this subject based on the ideXlab platform.
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Thermal energy storage in embankments: Investigation of the thermal properties of an unsaturated Compacted soil
E3S Web of Conferences, 2020Co-Authors: Mojdeh Lahoori, S. Rosin-paumier, A. Boukelia, Yves Jannot, F. MasrouriAbstract:Thermal energy storage in Compacted Soils can be considered as a new economically efficient and environmentally friendly technology in geotechnical engineering. Compacted Soils are usually unsaturated; therefore, reliable estimates and measurements of their thermal properties are important in the efficiency analysis of these structures. In this study, a method is used to estimate the thermal properties of an unsaturated Compacted soil. Several temperature sensors were placed in a thermo-regulated metric scale container to monitor the imposed temperature variation in the range of the 20 to 50 °C. This imposed temperature variation reproduced the temperature variation in the thermal energy storages. An inverse analytical model based on a one-dimensional radial heat conduction equation is used to estimate the thermal diffusivity using the temperature variation between two temperature sensors. The volumetric heat capacity was measured using a calorimeter in the laboratory, enabling the estimation of the thermal conductivity of the Compacted soil. Then, this estimated thermal conductivity was compared with the thermal conductivity values measured with two other methods (steady-state and transient-state method). The difference between them are discussed in terms of the sample heterogeneity, sample size, and measurement method.
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Effect of temperature and initial state on variation of thermal parameters of fine Compacted Soils
European Journal of Environmental and Civil Engineering, 2017Co-Authors: A. Boukelia, H. Eslami, S. Rosin-paumier, F. MasrouriAbstract:Soil thermal properties are needed in specific engineering applications, such as the design of high-level radioactive waste disposal, buried power transmission cables and geothermal systems. The propagation of the heat flow in a soil exposed to a temperature gradient is based on three main soil thermal properties: the thermal conductivity (λ), the thermal capacity (C) and the thermal diffusivity (α = λ/C). The temperature variations affect the physical properties of soil, inducing changes in its thermal properties. In this study, the evolution of thermal properties of different Compacted Soils exposed to cyclic temperature variations were investigated through laboratory tests. The results showed that at 20 °C, the thermal conductivity of the Compacted Soils increased on the dry side of the compaction curve until it reached a maximum near the optimum water content. Variation of λ in a temperature range of 1–20 °C was not shown, but a slight increase of λ was measured in the range of 20–40 °C, which was clearly confirmed in the range of 40–70 °C. The application of cyclic temperature variations to the samples showed partially reversible evolution of thermal conductivity and totally reversible evolution of volumetric heat capacity.
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Effect of temperature and initial state on variation of thermal parameters of fine Compacted Soils
European Journal of Environmental and Civil Engineering, 2017Co-Authors: A. Boukelia, H. Eslami, S. Rosin-paumier, F. MasrouriAbstract:AbstractSoil thermal properties are needed in specific engineering applications, such as the design of high-level radioactive waste disposal, buried power transmission cables and geothermal systems. The propagation of the heat flow in a soil exposed to a temperature gradient is based on three main soil thermal properties: the thermal conductivity (λ), the thermal capacity (C) and the thermal diffusivity (α = λ/C). The temperature variations affect the physical properties of soil, inducing changes in its thermal properties. In this study, the evolution of thermal properties of different Compacted Soils exposed to cyclic temperature variations were investigated through laboratory tests. The results showed that at 20 °C, the thermal conductivity of the Compacted Soils increased on the dry side of the compaction curve until it reached a maximum near the optimum water content. Variation of λ in a temperature range of 1–20 °C was not shown, but a slight increase of λ was measured in the range of 20–40 °C, which...
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Impact of temperature variation on penetration test parameters in Compacted Soils
European Journal of Environmental and Civil Engineering, 2013Co-Authors: H. Eslami, S. Rosin-paumier, A. Abdallah, F. MasrouriAbstract:In geotechnical engineering, the proper design of thermo-active geostructures (piles, foundations, etc.) and deep waste storage disposals requires a better understanding of the thermo-hydro-mechanical behaviour of natural and Compacted Soils. Important mechanical parameters of the Soils such as the cone resistance (qc) and the friction sleeve resistance (fs) are usually obtained by penetration in-situ tests. In the present study, penetration tests adapted from the static penetration method were conducted in laboratory, using a mini-penetrometer, to characterise Compacted samples. The objective was to examine and quantify the influence of temperature changes on penetration parameters of two different Compacted Soils. Samples of an illitic material and the kaolinite–sand mixture Compacted at different initial water contents and dry densities were subjected to a range of temperatures from 1 to 70 °C. The cone resistance (qc) and the friction sleeve resistance (fs) were measured. Obtained results showed that the particle size, the density and the nature of Compacted Soils have an important effect on the penetration test parameters. For illitic samples, we obtained significant variation of the cone resistance and friction sleeve resistance with temperature on the dry side of the compaction curve while limited changes were observed on the wet side. For the kaolinite–sand mixture, the temperature effect on these two parameters was negligible.
Abdulsahib T Almadhhachi - One of the best experts on this subject based on the ideXlab platform.
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laboratory soil piping and internal erosion experiments evaluation of a soil piping model for low Compacted Soils
Earth Surface Processes and Landforms, 2014Co-Authors: Garey A Fox, Rachel G Felice, Taber L Midgley, G V Wilson, Abdulsahib T AlmadhhachiAbstract:Mechanistic models have been proposed for soil piping and internal erosion on well-Compacted levees and dams, but limited research has evaluated these models in less Compacted (more erodible) Soils typical of hillslopes and streambanks. This study utilized a soil box (50 cm long, 50 cm wide and 20 cm tall) to conduct constant-head, soil pipe and internal erosion experiments for two Soils (clay loam from Dry Creek and sandy loam from Cow Creek streambanks) packed at uniform bulk densities. Initial gravimetric moisture contents prior to packing were 10, 12 and 14% for Dry Creek soil and 8, 12, and 14% for Cow Creek soil. A 1-cm diameter rod was placed horizontally along the length of the soil bed during packing and carefully removed after packing to create a continuous soil pipe. A constant head was maintained at the inflow end. Flow rates and sediment concentrations were measured from the pipe outlet. Replicate submerged jet erosion tests (JETs) were conducted to derive erodibility parameters for repacked samples at the same moisture contents. Flow rates from the box experiments were used to calibrate the mechanistic model. The influence of the initial moisture content was apparent, with some pipes (8% moisture content) expanding so fast that limited data was collected. The mechanistic model was able to estimate equivalent flow rates to those observed in the experiments, but had difficulty matching observed sediment concentrations when the pipes rapidly expanded. The JETs predicted similar erodibility coefficients compared to the mechanistic model for the more erodible cases but not for the less erodible cases (14% moisture content). Improved models are needed that better define the changing soil pipe cross-section during supply- and transport-limited internal erosion, especially for piping through lower Compacted (more erodible) Soils as opposed to more well-Compacted Soils resulting from constructing levees and dams. Copyright © 2013 John Wiley & Sons, Ltd.
Rachel G Felice - One of the best experts on this subject based on the ideXlab platform.
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laboratory soil piping and internal erosion experiments evaluation of a soil piping model for low Compacted Soils
Earth Surface Processes and Landforms, 2014Co-Authors: Garey A Fox, Rachel G Felice, Taber L Midgley, G V Wilson, Abdulsahib T AlmadhhachiAbstract:Mechanistic models have been proposed for soil piping and internal erosion on well-Compacted levees and dams, but limited research has evaluated these models in less Compacted (more erodible) Soils typical of hillslopes and streambanks. This study utilized a soil box (50 cm long, 50 cm wide and 20 cm tall) to conduct constant-head, soil pipe and internal erosion experiments for two Soils (clay loam from Dry Creek and sandy loam from Cow Creek streambanks) packed at uniform bulk densities. Initial gravimetric moisture contents prior to packing were 10, 12 and 14% for Dry Creek soil and 8, 12, and 14% for Cow Creek soil. A 1-cm diameter rod was placed horizontally along the length of the soil bed during packing and carefully removed after packing to create a continuous soil pipe. A constant head was maintained at the inflow end. Flow rates and sediment concentrations were measured from the pipe outlet. Replicate submerged jet erosion tests (JETs) were conducted to derive erodibility parameters for repacked samples at the same moisture contents. Flow rates from the box experiments were used to calibrate the mechanistic model. The influence of the initial moisture content was apparent, with some pipes (8% moisture content) expanding so fast that limited data was collected. The mechanistic model was able to estimate equivalent flow rates to those observed in the experiments, but had difficulty matching observed sediment concentrations when the pipes rapidly expanded. The JETs predicted similar erodibility coefficients compared to the mechanistic model for the more erodible cases but not for the less erodible cases (14% moisture content). Improved models are needed that better define the changing soil pipe cross-section during supply- and transport-limited internal erosion, especially for piping through lower Compacted (more erodible) Soils as opposed to more well-Compacted Soils resulting from constructing levees and dams. Copyright © 2013 John Wiley & Sons, Ltd.
Tugce Baser - One of the best experts on this subject based on the ideXlab platform.
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estimating of the dry unit weight of Compacted Soils using general linear model and multi layer perceptron neural networks
Applied Soft Computing, 2014Co-Authors: Ersin Kolay, Tugce BaserAbstract:We examine the new method that is non-destructive to determine dry unit weight of Compacted Soils.Dry unit weights of Compacted Soils are modeled by GLM and MLP.Different soil types do not display same behavior of Vp measurements.MLP is considered for each soil types for accurate estimation of dry unit weights. Compaction of earth fill is a very important stage of construction projects. Degree of compaction is defined by relative compaction. The relative compaction of a Compacted earth fill is calculated by dividing the dry unit weight obtained from in situ tests by-into the maximum dry unit weight obtained from laboratory compaction tests. This rate represents compaction quality in the field. Numerous test methods such as sand cone, rubber balloon, nuclear measurements, etc., are available to determine the maximum dry unit weight of Soils in the field. It is well known that these methods have disadvantages as well as advantages. This study focused on estimation of dry unit weight of Soils depending on water contents and P-wave velocities of Compacted Soils. The multi-layer perceptron (MLP) neural networks and general linear model (GLM) were used in this study to estimate the dry unit weight of different types of Soils. Results of the MLP neural networks were compared with the GLM results. Based on the comparisons, it is found that the MLP generally gives better dry unit weight estimates than the GLM technique. The laboratory experiments and modeling studies showed that a new method for compaction control can be developed depending on P-wave velocity to estimate of the dry unit weight of Compacted Soils.
Alessandro Tarantino - One of the best experts on this subject based on the ideXlab platform.
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unsaturated Soils Compacted versus reconstituted states
5th International Conference on Unsaturated Soil, 2010Co-Authors: Alessandro TarantinoAbstract:The paper presents a comparison between Compacted and reconstituted Soils in terms of microstructure, and hydraulic and mechanical response. It is commonly assumed that reconstituted and Compacted Soils exhibit a fundamentally different behaviour due to different microstructures. However, the variety of pore size distributions observed in both Compacted and reconstituted/natural Soils suggests that the boundary between Compacted and reconstituted states is more blurred. In the paper, an attempt is made to recognize similarities and differences between Compacted and reconstitutes states based on a number of recent experimental studies where the microstructure and the hydraulic and mechanical behaviour of unsaturated Soils in Compacted and reconstituted states have been investigated. This exercise will also offer the opportunity to gain a better insight into the microstructure of Compacted Soils.
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a possible critical state framework for unsaturated Compacted Soils
Geotechnique, 2007Co-Authors: Alessandro TarantinoAbstract:Elasto-plastic models have recently been proposed to account for coupling between mechanical behaviour and water retention behaviour in unsaturated Soils.