The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Wasim R Azzam - One of the best experts on this subject based on the ideXlab platform.

  • improving the bearing capacity of footing on Soft Clay with sand pile with without skirts
    alexandria engineering journal, 2010
    Co-Authors: Ashraf K Nazir, Wasim R Azzam
    Abstract:

    Abstract This paper presents the results of laboratory model tests for studying the improvement of Soft Clay Layer by using both partially replaced sand piles with/without confinement. This research is performed to study the effect of sand pile to improve the bearing capacity and to control the settlement. Also the research aimed at investigating the variation of subgrade modulus, and the induced failure mechanism of shallow circular footing on replaced soil with/without skirts. The results show that the improvement of load bearing capacity is remarkable; using both partially replaced sand pile with and without confinement by skirts. The adopted technique can substantially modify the stress displacement curve of the footing rested on Soft Clay Layer, significantly decreases the settlement and the replaced soil block inside the skirts behave as deep foundation. Therefore, the bearing capacity failure mechanism of a footing rested on Soft Clay can be modified from exclusive settlement to general bearing capacity failure at the tip of confined replaced sand column.

  • Improving the bearing capacity of footing on Soft Clay with sand pile with/without skirts
    Alexandria Engineering Journal, 2010
    Co-Authors: Ashraf K Nazir, Wasim R Azzam
    Abstract:

    Abstract This paper presents the results of laboratory model tests for studying the improvement of Soft Clay Layer by using both partially replaced sand piles with/without confinement. This research is performed to study the effect of sand pile to improve the bearing capacity and to control the settlement. Also the research aimed at investigating the variation of subgrade modulus, and the induced failure mechanism of shallow circular footing on replaced soil with/without skirts. The results show that the improvement of load bearing capacity is remarkable; using both partially replaced sand pile with and without confinement by skirts. The adopted technique can substantially modify the stress displacement curve of the footing rested on Soft Clay Layer, significantly decreases the settlement and the replaced soil block inside the skirts behave as deep foundation. Therefore, the bearing capacity failure mechanism of a footing rested on Soft Clay can be modified from exclusive settlement to general bearing capacity failure at the tip of confined replaced sand column.

Takahiro Sugano - One of the best experts on this subject based on the ideXlab platform.

  • Effects of the stiffness of Soft Clay Layer on strong motion response
    SOILS AND FOUNDATIONS, 2002
    Co-Authors: Akira Yamaguchi, Motoki Kazama, Hirofumi Toyota, Masaki Kitazume, Takahiro Sugano
    Abstract:

    This paper shows the effects of the stiffness of an underlying Soft Clay Layer on the strong motion response. Seismic behavior of Kobe's artificial islands during the 1995 Hyogo-ken Nambu earthquake is studied by centrifuge shaking table test. During the earthquake, it is known that the liquefaction damage on artificial islands was different at each site. The authors consider that this is due to the stiffness of the Clay Layer underlying the reclaimed ground because of the degree of consolidation. The model grounds used for the centrifuge test were made with Clay and fill material sampled from Kobe Port Island, and the Clay material was consolidated at two different degrees of consolidation, which correspond to those of the Port Island array observation site and the south-western part of Rokko Island. First, from the viewpoint of the reproducibility of in-situ behavior, we compared the seismic response and the ground settlement obtained from centrifuge test with those of the observation data of Port Island. Next, we compared the seismic response of the test results of the different degree of consolidation. It is found that the difference of stiffness due to the degree of consolidation of the underlying Clay Layer significantly affects the seismic behavior of reclaimed ground. The large damage is not always come to being on the ground with Soft Clay Layer.

Ashraf K Nazir - One of the best experts on this subject based on the ideXlab platform.

  • improving the bearing capacity of footing on Soft Clay with sand pile with without skirts
    alexandria engineering journal, 2010
    Co-Authors: Ashraf K Nazir, Wasim R Azzam
    Abstract:

    Abstract This paper presents the results of laboratory model tests for studying the improvement of Soft Clay Layer by using both partially replaced sand piles with/without confinement. This research is performed to study the effect of sand pile to improve the bearing capacity and to control the settlement. Also the research aimed at investigating the variation of subgrade modulus, and the induced failure mechanism of shallow circular footing on replaced soil with/without skirts. The results show that the improvement of load bearing capacity is remarkable; using both partially replaced sand pile with and without confinement by skirts. The adopted technique can substantially modify the stress displacement curve of the footing rested on Soft Clay Layer, significantly decreases the settlement and the replaced soil block inside the skirts behave as deep foundation. Therefore, the bearing capacity failure mechanism of a footing rested on Soft Clay can be modified from exclusive settlement to general bearing capacity failure at the tip of confined replaced sand column.

  • Improving the bearing capacity of footing on Soft Clay with sand pile with/without skirts
    Alexandria Engineering Journal, 2010
    Co-Authors: Ashraf K Nazir, Wasim R Azzam
    Abstract:

    Abstract This paper presents the results of laboratory model tests for studying the improvement of Soft Clay Layer by using both partially replaced sand piles with/without confinement. This research is performed to study the effect of sand pile to improve the bearing capacity and to control the settlement. Also the research aimed at investigating the variation of subgrade modulus, and the induced failure mechanism of shallow circular footing on replaced soil with/without skirts. The results show that the improvement of load bearing capacity is remarkable; using both partially replaced sand pile with and without confinement by skirts. The adopted technique can substantially modify the stress displacement curve of the footing rested on Soft Clay Layer, significantly decreases the settlement and the replaced soil block inside the skirts behave as deep foundation. Therefore, the bearing capacity failure mechanism of a footing rested on Soft Clay can be modified from exclusive settlement to general bearing capacity failure at the tip of confined replaced sand column.

Mitsuo Nozu - One of the best experts on this subject based on the ideXlab platform.

  • Undrained Shear Strength of Clay Improved with Sand Compaction Piles
    Soils and Foundations, 1994
    Co-Authors: Akira Asaoka, Takeshi Kodaka, Mitsuo Nozu
    Abstract:

    The Sand Compaction Pile (SCP) method is considered to be a displacement type pile method, in which a considerable amount of "set-up" of the undrained shear strength of the surrounding Clay is anticipated. A simplified procedure for analyzing the set-up problem is presented in two stages. The first stage is the soil-water coupled rigid plastic finite element method which is employed for solving undrained failure of Clay due to pile driving, and the other, a linear elastic consolidation computation which accounts for the decrease of void ratio of the Clay after pile driving. The value of this simplified method is examined through (1) laboratory set-up experiment on a remoulded Kawasaki Clay using a triaxial apparatus aud (2) the case record of in-situ loading test on Soft Clay improved with the SCP method. In the latter case, extensive improvement in the Soft Clay was found particularly at a large depth of the Soft Clay Layer, where the set-up ratio was more than two.

Akira Yamaguchi - One of the best experts on this subject based on the ideXlab platform.

  • Effects of the stiffness of Soft Clay Layer on strong motion response
    SOILS AND FOUNDATIONS, 2002
    Co-Authors: Akira Yamaguchi, Motoki Kazama, Hirofumi Toyota, Masaki Kitazume, Takahiro Sugano
    Abstract:

    This paper shows the effects of the stiffness of an underlying Soft Clay Layer on the strong motion response. Seismic behavior of Kobe's artificial islands during the 1995 Hyogo-ken Nambu earthquake is studied by centrifuge shaking table test. During the earthquake, it is known that the liquefaction damage on artificial islands was different at each site. The authors consider that this is due to the stiffness of the Clay Layer underlying the reclaimed ground because of the degree of consolidation. The model grounds used for the centrifuge test were made with Clay and fill material sampled from Kobe Port Island, and the Clay material was consolidated at two different degrees of consolidation, which correspond to those of the Port Island array observation site and the south-western part of Rokko Island. First, from the viewpoint of the reproducibility of in-situ behavior, we compared the seismic response and the ground settlement obtained from centrifuge test with those of the observation data of Port Island. Next, we compared the seismic response of the test results of the different degree of consolidation. It is found that the difference of stiffness due to the degree of consolidation of the underlying Clay Layer significantly affects the seismic behavior of reclaimed ground. The large damage is not always come to being on the ground with Soft Clay Layer.