The Experts below are selected from a list of 142293 Experts worldwide ranked by ideXlab platform
Ruiyin He - One of the best experts on this subject based on the ideXlab platform.
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stress transmission coefficient a soil stress transmission property for a Loading Process
Soil & Tillage Research, 2017Co-Authors: Tingfeng He, Qishuo Ding, Yinian Li, Ruiyin HeAbstract:Abstract Predicting soil stress with analytical models requires proper selection of the models’ concentration factor. But due to the insufficient knowledge about the effects of soil conditions on stress transmission, little is known about how the concentration factor varies with soil states and Loading conditions. Thus there is a need to supply specifically defined parameters with clearer physical meanings for soil stress transmission while easily being measured with simple laboratory setups. The function of the concentration factor was transformed and a dimensionless factor standing for soil-induced attenuation on the stress transmission between two points, ( σ 0 - σ z )/ σ 0 , was derived, which complement, σ z / σ 0 , is the soil stress transmission coefficient and is denoted as STC. Since soil stress transmission property is affected by soil states and Loading conditions, a modified oedometer testing setup with a soil stress sensor was used to evaluate controlled soil properties on STCs. Totally 15 soil states were tested by controlling 5 soil water contents and 3 bulk densities. Correlation analysis were performed between measured STCs and soil state parameters, i.e. water content, bulk density and soil strength. The concentration factor was then back-calculated from the acquired STCs. The highly linear correlation between soil stress and applied surface stress indicates a stable STC for each particular soil state, suggesting that the theoretically derived STC could be used as a specific mechanical property to quantify soil stress transmission. In general, a high soil water content leads to an increased STC, meaning that wetter soils are more effective in transmitting the stress to deeper places. STC was also found both linearly decreased with dry bulk density and precompression stress. A higher soil strength imposes an improved shielding effect on soil stress transmission. The back-calculation of concentration factor from measured STCs illustrates that the proposed solution for soil stress transmission provides a means to define concentration factor for each soil state with measured result. Concentration factor varied from 2.64 to 12.39, being in agreement with the past reports. But the detail of how the concentration factor is affected by the changed states of soils is provided.
Tingfeng He - One of the best experts on this subject based on the ideXlab platform.
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stress transmission coefficient a soil stress transmission property for a Loading Process
Soil & Tillage Research, 2017Co-Authors: Tingfeng He, Qishuo Ding, Yinian Li, Ruiyin HeAbstract:Abstract Predicting soil stress with analytical models requires proper selection of the models’ concentration factor. But due to the insufficient knowledge about the effects of soil conditions on stress transmission, little is known about how the concentration factor varies with soil states and Loading conditions. Thus there is a need to supply specifically defined parameters with clearer physical meanings for soil stress transmission while easily being measured with simple laboratory setups. The function of the concentration factor was transformed and a dimensionless factor standing for soil-induced attenuation on the stress transmission between two points, ( σ 0 - σ z )/ σ 0 , was derived, which complement, σ z / σ 0 , is the soil stress transmission coefficient and is denoted as STC. Since soil stress transmission property is affected by soil states and Loading conditions, a modified oedometer testing setup with a soil stress sensor was used to evaluate controlled soil properties on STCs. Totally 15 soil states were tested by controlling 5 soil water contents and 3 bulk densities. Correlation analysis were performed between measured STCs and soil state parameters, i.e. water content, bulk density and soil strength. The concentration factor was then back-calculated from the acquired STCs. The highly linear correlation between soil stress and applied surface stress indicates a stable STC for each particular soil state, suggesting that the theoretically derived STC could be used as a specific mechanical property to quantify soil stress transmission. In general, a high soil water content leads to an increased STC, meaning that wetter soils are more effective in transmitting the stress to deeper places. STC was also found both linearly decreased with dry bulk density and precompression stress. A higher soil strength imposes an improved shielding effect on soil stress transmission. The back-calculation of concentration factor from measured STCs illustrates that the proposed solution for soil stress transmission provides a means to define concentration factor for each soil state with measured result. Concentration factor varied from 2.64 to 12.39, being in agreement with the past reports. But the detail of how the concentration factor is affected by the changed states of soils is provided.
Teruo Nakai - One of the best experts on this subject based on the ideXlab platform.
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Displacement in sand under triaxial compression by tracking soil particles on X-ray CT data
Soils and Foundations, 2012Co-Authors: Yoichi Watanabe, Nicolas Lenoir, Jun Otani, Teruo NakaiAbstract:The objective of this paper is to obtain displacements in sand in three dimensions under triaxial compression using the results of X-ray CT. A triaxial compression test was conducted on soil called "Yamazuna sand", which has a wide grain size distribution, and the specimens were subject to CT scanning during the Loading Process. A large number of CT images, both 2D cross sectional images and also 3D reconstruction images, were obtained from CT scanning. The first objective in this study was to develop a method of tracking soil particles using CT images and then to calculate their movement using this proposed method. The total number of soil particles depended on the relationship between the size of the soil particles and the resolution of the CT apparatus. Finally, the displacement vectors from these movements were calculated in three dimensions under the Loading Process and the distribution of the localized displacement in the sand was measured. It was confirmed that the combination of the tracking technique with CT images is effective for quantitative discussion on the results of X-ray CT. © 2012 The Japanese Geotechnical Society.
Qishuo Ding - One of the best experts on this subject based on the ideXlab platform.
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stress transmission coefficient a soil stress transmission property for a Loading Process
Soil & Tillage Research, 2017Co-Authors: Tingfeng He, Qishuo Ding, Yinian Li, Ruiyin HeAbstract:Abstract Predicting soil stress with analytical models requires proper selection of the models’ concentration factor. But due to the insufficient knowledge about the effects of soil conditions on stress transmission, little is known about how the concentration factor varies with soil states and Loading conditions. Thus there is a need to supply specifically defined parameters with clearer physical meanings for soil stress transmission while easily being measured with simple laboratory setups. The function of the concentration factor was transformed and a dimensionless factor standing for soil-induced attenuation on the stress transmission between two points, ( σ 0 - σ z )/ σ 0 , was derived, which complement, σ z / σ 0 , is the soil stress transmission coefficient and is denoted as STC. Since soil stress transmission property is affected by soil states and Loading conditions, a modified oedometer testing setup with a soil stress sensor was used to evaluate controlled soil properties on STCs. Totally 15 soil states were tested by controlling 5 soil water contents and 3 bulk densities. Correlation analysis were performed between measured STCs and soil state parameters, i.e. water content, bulk density and soil strength. The concentration factor was then back-calculated from the acquired STCs. The highly linear correlation between soil stress and applied surface stress indicates a stable STC for each particular soil state, suggesting that the theoretically derived STC could be used as a specific mechanical property to quantify soil stress transmission. In general, a high soil water content leads to an increased STC, meaning that wetter soils are more effective in transmitting the stress to deeper places. STC was also found both linearly decreased with dry bulk density and precompression stress. A higher soil strength imposes an improved shielding effect on soil stress transmission. The back-calculation of concentration factor from measured STCs illustrates that the proposed solution for soil stress transmission provides a means to define concentration factor for each soil state with measured result. Concentration factor varied from 2.64 to 12.39, being in agreement with the past reports. But the detail of how the concentration factor is affected by the changed states of soils is provided.
Yinian Li - One of the best experts on this subject based on the ideXlab platform.
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stress transmission coefficient a soil stress transmission property for a Loading Process
Soil & Tillage Research, 2017Co-Authors: Tingfeng He, Qishuo Ding, Yinian Li, Ruiyin HeAbstract:Abstract Predicting soil stress with analytical models requires proper selection of the models’ concentration factor. But due to the insufficient knowledge about the effects of soil conditions on stress transmission, little is known about how the concentration factor varies with soil states and Loading conditions. Thus there is a need to supply specifically defined parameters with clearer physical meanings for soil stress transmission while easily being measured with simple laboratory setups. The function of the concentration factor was transformed and a dimensionless factor standing for soil-induced attenuation on the stress transmission between two points, ( σ 0 - σ z )/ σ 0 , was derived, which complement, σ z / σ 0 , is the soil stress transmission coefficient and is denoted as STC. Since soil stress transmission property is affected by soil states and Loading conditions, a modified oedometer testing setup with a soil stress sensor was used to evaluate controlled soil properties on STCs. Totally 15 soil states were tested by controlling 5 soil water contents and 3 bulk densities. Correlation analysis were performed between measured STCs and soil state parameters, i.e. water content, bulk density and soil strength. The concentration factor was then back-calculated from the acquired STCs. The highly linear correlation between soil stress and applied surface stress indicates a stable STC for each particular soil state, suggesting that the theoretically derived STC could be used as a specific mechanical property to quantify soil stress transmission. In general, a high soil water content leads to an increased STC, meaning that wetter soils are more effective in transmitting the stress to deeper places. STC was also found both linearly decreased with dry bulk density and precompression stress. A higher soil strength imposes an improved shielding effect on soil stress transmission. The back-calculation of concentration factor from measured STCs illustrates that the proposed solution for soil stress transmission provides a means to define concentration factor for each soil state with measured result. Concentration factor varied from 2.64 to 12.39, being in agreement with the past reports. But the detail of how the concentration factor is affected by the changed states of soils is provided.
