The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Decheng Wang - One of the best experts on this subject based on the ideXlab platform.
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Estimating Soil Failure due to torsion via vane shear test by varying vane diameter and Soil properties
Soil and Tillage Research, 2018Co-Authors: Yong You, Decheng WangAbstract:Abstract Soil–tool interaction poses an ongoing challenge to researchers, developers, and manufacturers. Numerous studies have focused on reaction forces, resistances, and associated Soil Failures during the penetration of tillage tools into Soil or their surface movements. However, little research has been devoted to the interactions involved in the torsion Failure of Soil in agricultural tillage systems. To study the resistance of Soil to Failure due to torsion actions, this study develops a torsion-induced Soil Failure estimation model that is used to obtain relevant parameters based on in-situ experiments conducted in a Soil bin by using Soil with different physical properties (i.e., moisture content and Soil density). Four vanes with various diameters but the same height (5 cm) were designed. The maximum torques at which Soil Failure occurred were then measured and analyzed. The results revealed a power function relationship between the Soil Failure due to torsion and the diameter of the vane, i.e., T = αD β ( R 2 > 0.96). The dimensionless parameters α and β of the estimation model were found to be related to the Soil moisture (P
Zhenyu Wang - One of the best experts on this subject based on the ideXlab platform.
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Seepage Induced Soil Failure and its Mitigation During Suction Caisson Installation in Silt
Journal of Offshore Mechanics and Arctic Engineering, 2013Co-Authors: Lizhong Wang, Yu Luqing, Zhen Guo, Zhenyu WangAbstract:Suction caisson is an advantaged foundation option for offshore wind turbines in sandy and clayey Soils. In this work, a series of model tests were conducted to investigate the installation behavior of a suction caisson in silty Soils. The test results showed that the total Soil resistance to the caisson increased steadily with penetration depth in the beginning of the suction-assisted penetration (SP) process, but rose slowly or remained constant after reaching a certain depth with excessive Soil heave. This Failure mechanism, which was quite different from that identified in sandy or clayey Soils, was caused by the seepage induced silt Soil Failure in the caisson, such as erosion, liquefaction or piping, with reducing internal side friction and tip resistance. To suppress this type of Failure, a special filtration method was introduced to help caisson penetration. The test results showed that such filtration technique had the advantage of reducing the height of Soil heave and prevent seepage induced Soil Failure in the silt, but also suppress the under pressure effects on reducing the Soil resistance. Numerical simulations were also performed to aid in understanding the observed test results and mitigation mechanisms.
Fu Yi-peng - One of the best experts on this subject based on the ideXlab platform.
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Comparative Study on Subgrade Bearing Capacity Characteristic Value and Pile Point Bearing Capacity Characteristic Value
Coastal Engineering, 2006Co-Authors: Fu Yi-pengAbstract:In this paper,Meyerhof theory of ultimate subgrade bearing capacity is used to analyze the change in foundation Soil Failure form along with increasing burial depth of foundation,and the comparative study on the subgrade bearing capacity characteristic value and pile point bearing capacity characteristic value is also made,which will help establish and distinguish the physical concepts of the two characteristic values and is of guidance significance to practical engineerings.
Subrata Karmakar - One of the best experts on this subject based on the ideXlab platform.
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Dynamic modeling of Soil–tool interaction: An overview from a fluid flow perspective
Journal of Terramechanics, 2006Co-Authors: Subrata Karmakar, R.l. KushwahaAbstract:Abstract The study of tillage tool interaction centers on Soil Failure patterns and development of force prediction models for design optimization. The force-deformation relationships used in models developed to date have been considering Soil as a rigid solid or elasto-plastic medium. Most of the models are based on quasi-static Soil Failure patterns. In recent years, efforts have been made to improve the conventional analytical and experimental models by numerical approaches. This paper aims at reviewing the existing methods of tillage tool modeling and exploring the use of computational fluid dynamics to deal with unresolved aspects of Soil dynamics in tillage. The discussion also focuses on Soil rheological behaviour for its visco-plastic nature and its mass deformation due to machine interaction which may be analyzed as a Bingham plastic material using a fluid flow approach. Preliminary results on visco-plastic Soil deformation patterns and Failure front advancement are very encouraging. For a tool operating speed of 5.5 m s −1 , the Soil Failure front was observed to be about 100-mm forward of the tool.
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Soil Failure associated with crack propagation for an agricultural tillage tool
Soil and Tillage Research, 2005Co-Authors: Subrata Karmakar, R.l. Kushwaha, D.s.d. StillingAbstract:Abstract Tillage loosens Soil to depths of 75–150 mm (3–6 in.). As the Soil is tilled, the Failure path precedes the motion of the tillage tool. Previous studies have examined Soil forces acting on a tine by predicting different Soil Failure patterns. This paper quantifies the rate and the path of the cracks associated with Soil Failure front. The propagation of the Soil Failure path by observing the temporal profile of the leading edge of the Failure crack with respect to the tool motion was examined. Crack propagations were analysed for sweep operating at 4 km h −1 speed, and two operating depths of 75 and 100 mm using high-speed digital videography. Higher depth of operation showed distinct phases for crack development and propagation. Short and intermittent Soil crack propagation with lower propagation growth rates was observed for shallow depth of operation. Crack growth rate has been observed to have a sinusoidal relation with time.
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Propagation of Soil Failure Front Associated with various Agricultural Tillage Tools
2003 Las Vegas NV July 27-30 2003, 2003Co-Authors: Subrata Karmakar, R.l. Kushwaha, D.s.d. StillingAbstract:Current North American Soil tillage practices loosen Soil to depths of 75 to 150 mm (3 to 6 inches). As the Soil is tilled, the Failure path precedes the motion of the tillage tool. Previous research has examined the forces within the Soil to predict the Soil Failure. This paper experimentally quantifies the rate and the path of the Failure front through the Soil. From high speed digital film analysis, the Failure front was analysed for three tillage tools operating at 4 km/h speed. The tillage tools included sweep, knife opener and an elliptical tool. The depth of operation was either 75 mm or 100mm. Soil conditions, namely its moisture content and the level of compactness were recorded. For the sweep tillage tool, temporal profiles of the Failure or crack growth were quantified from the high speed videography. If the tool operational speed can be increased to overcome the speed of the Failure front, the Soil disturbances will be minimal to non existent.
D.s.d. Stilling - One of the best experts on this subject based on the ideXlab platform.
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Soil Failure associated with crack propagation for an agricultural tillage tool
Soil and Tillage Research, 2005Co-Authors: Subrata Karmakar, R.l. Kushwaha, D.s.d. StillingAbstract:Abstract Tillage loosens Soil to depths of 75–150 mm (3–6 in.). As the Soil is tilled, the Failure path precedes the motion of the tillage tool. Previous studies have examined Soil forces acting on a tine by predicting different Soil Failure patterns. This paper quantifies the rate and the path of the cracks associated with Soil Failure front. The propagation of the Soil Failure path by observing the temporal profile of the leading edge of the Failure crack with respect to the tool motion was examined. Crack propagations were analysed for sweep operating at 4 km h −1 speed, and two operating depths of 75 and 100 mm using high-speed digital videography. Higher depth of operation showed distinct phases for crack development and propagation. Short and intermittent Soil crack propagation with lower propagation growth rates was observed for shallow depth of operation. Crack growth rate has been observed to have a sinusoidal relation with time.
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Propagation of Soil Failure Front Associated with various Agricultural Tillage Tools
2003 Las Vegas NV July 27-30 2003, 2003Co-Authors: Subrata Karmakar, R.l. Kushwaha, D.s.d. StillingAbstract:Current North American Soil tillage practices loosen Soil to depths of 75 to 150 mm (3 to 6 inches). As the Soil is tilled, the Failure path precedes the motion of the tillage tool. Previous research has examined the forces within the Soil to predict the Soil Failure. This paper experimentally quantifies the rate and the path of the Failure front through the Soil. From high speed digital film analysis, the Failure front was analysed for three tillage tools operating at 4 km/h speed. The tillage tools included sweep, knife opener and an elliptical tool. The depth of operation was either 75 mm or 100mm. Soil conditions, namely its moisture content and the level of compactness were recorded. For the sweep tillage tool, temporal profiles of the Failure or crack growth were quantified from the high speed videography. If the tool operational speed can be increased to overcome the speed of the Failure front, the Soil disturbances will be minimal to non existent.