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Nihar Ranjan Patra - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Arching on uplift capacity of single piles
    Geotechnical and Geological Engineering, 2009
    Co-Authors: Amit Shelke, Nihar Ranjan Patra
    Abstract:

    An analytical method has been proposed to predict the ultimate uplift capacity of single vertical piles embedded in sand considering Arching Effect. The present analysis takes into consideration of various pile and soil parameters such as length (L), diameter (d) of the pile, angle of internal friction of soil (ϕ), soil pile friction angle (δ) and unit weight of soil (γ). A modified value of coefficient of lateral earth pressure in uplift has been developed considering the Arching Effect of soil. A comparative assessment of the uplift capacity of piles predicted by using proposed theory and the existing available theories is made with the existing field and model test results. It has been observed that the present model considering the Arching Effect predicts the results closer.

  • Effect of Arching on uplift capacity of pile groups in sand
    International Journal of Geomechanics, 2008
    Co-Authors: Amit Shelke, Nihar Ranjan Patra
    Abstract:

    In this paper an analytical method has been proposed to predict the net ultimate uplift capacity of pile groups embedded in sand considering the Arching Effect. This method takes into consideration the embedded length (L) , diameter of the pile (d) , surface characteristics of pile, group configuration, spacing of the pile group ( 3d to 6d ), and the soil properties. Arching develops due to relative compressibility of sand relative to pile which activates the soil–pile friction. As piles/pile groups move up, the active state of soil is initiated. The modified value of active earth pressure coefficient considering Arching Effect has been derived. Typical charts for evaluation of net ultimate uplift capacity for pile groups are presented through the figures. The predicted values of ultimate uplift capacity of pile groups with different configuration and slenderness ratios are compared with the available experimental results. The predicted values considering Arching Effect are found to be in good agreement w...

Frank Y Chen - One of the best experts on this subject based on the ideXlab platform.

  • experimental study of soil Arching Effect under seepage condition
    Acta Geotechnica, 2019
    Co-Authors: Luju Liang, Qizhi Chen, Wenjun Luo, Frank Y Chen
    Abstract:

    Soil Arching Effect, which relates to the load transfer and stress redistribution in a soil mass, exists commonly in various geotechnical situations. Many researchers have conducted trapdoor tests and theoretical analyses to study the soil Arching and its development in recent years. However, little attention has been paid to the interaction between soil Arching and seepage flow, both occurring during the tunnelling of a seabed tunnel. To study the influence of the seepage flow on soil Arching, a series of two-dimensional trapdoor tests were carried out considering different fill heights and water level heights. Two subvertical slip surfaces were observed during the tests using the PIV technique. It was found that seepage flow increased the displacement of the particles and the Effective vertical stress acting at the top of the trapdoor. However, there was little difference in the development of slip surfaces between the seepage condition and the saturated/no-seepage condition. In addition, a nonuniform distribution of vertical stresses at the top of the trapdoor was observed. The Effective earth pressure measured along the centreline of the trapdoor was larger than that on the two edges of the trapdoor. But this nonuniformity decreased with an increasing water level height in the test chamber.

Amit Shelke - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Arching on uplift capacity of single piles
    Geotechnical and Geological Engineering, 2009
    Co-Authors: Amit Shelke, Nihar Ranjan Patra
    Abstract:

    An analytical method has been proposed to predict the ultimate uplift capacity of single vertical piles embedded in sand considering Arching Effect. The present analysis takes into consideration of various pile and soil parameters such as length (L), diameter (d) of the pile, angle of internal friction of soil (ϕ), soil pile friction angle (δ) and unit weight of soil (γ). A modified value of coefficient of lateral earth pressure in uplift has been developed considering the Arching Effect of soil. A comparative assessment of the uplift capacity of piles predicted by using proposed theory and the existing available theories is made with the existing field and model test results. It has been observed that the present model considering the Arching Effect predicts the results closer.

  • Effect of Arching on uplift capacity of pile groups in sand
    International Journal of Geomechanics, 2008
    Co-Authors: Amit Shelke, Nihar Ranjan Patra
    Abstract:

    In this paper an analytical method has been proposed to predict the net ultimate uplift capacity of pile groups embedded in sand considering the Arching Effect. This method takes into consideration the embedded length (L) , diameter of the pile (d) , surface characteristics of pile, group configuration, spacing of the pile group ( 3d to 6d ), and the soil properties. Arching develops due to relative compressibility of sand relative to pile which activates the soil–pile friction. As piles/pile groups move up, the active state of soil is initiated. The modified value of active earth pressure coefficient considering Arching Effect has been derived. Typical charts for evaluation of net ultimate uplift capacity for pile groups are presented through the figures. The predicted values of ultimate uplift capacity of pile groups with different configuration and slenderness ratios are compared with the available experimental results. The predicted values considering Arching Effect are found to be in good agreement w...

Francisco Melo - One of the best experts on this subject based on the ideXlab platform.

  • size segregation convection and Arching Effect
    Physical Review E, 2005
    Co-Authors: Alejandro Saez, Francisco Vivanco, Francisco Melo
    Abstract:

    We present a numerical study based on the contact dynamic procedure for the size segregation in a two-dimensional vibrating container. In agreement with previous studies, we find that the rising of the larger particle is accompanied by convection rolls. However, at low enough acceleration, rolls do not penetrate the entire cell and a local vault mechanism is observed, in which the larger particle moves up by steps. This mechanism, described in experiments by Duran and co-workers [Phys. Rev. E. 50, 5138 (1994)], occurs in a very narrow region of parameter space. Once the larger intruder reaches the exponential tail of convecting roll, its vertical motion becomes continuous and the corresponding rising speed is dramatically increased.

Eric Clément - One of the best experts on this subject based on the ideXlab platform.

  • Arching Effect model for particle size segregation.
    Physical review letters, 1993
    Co-Authors: J. Duran, Jean Rajchenbach, Eric Clément
    Abstract:

    Starting from 2D experimental observations and using topological arguments, we search for the set of stable positions when a large disk is raised step by step among a 2D array of small monodisperse disks. We show and confirm experimentally that larger disks should move upward continuously via the Arching Effect whereas smaller disks may only climb up intermittently. We find the critical diameter ratio for a continuous ascent in 2D and 3D. Our model sheds a new light on the decisive role played by vaults in particle size segregation.