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M. F. Awad-Allah
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Full-scale Tests of Ground Anchors in Alluvium Soils of Egypt M. F. Awad-Allah
Lowland Technology International Vol 20 No 1, June (2018)
Publisher : International Association of Lowland Technology

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This paper presents full-scale pullout ground anchor tests conducted in some types of alluvial soil formations in Egypt, including silty sand, sandstone, and clay soils. The tests were carried out up to failure loads in order to estimate the ultimate load of friction bearing capacity for each soil stratum. Moreover, an elaborated site investigation program was performed to predict the in-situ soil properties. This research campaign is a part of construction of residential and commercial complex which comprises six underground basements, and the site is located in a vital and highly traffic zone of Heliopolis, Cairo, Egypt. Field test setup and installation method of the full-scale ground anchors were explained. The results of the field tests were compared against the design values of unit skin friction resistance given by the well-known codes of practice (AASHTO; BS 8081; and Canadian Foundation Engineering Manual) and the literature for design of ground anchorage. The comparison showed that the values of skin friction resistance for anchorsoil/rock interface given in AASHTO (2004) and BS 8081 (1989) can be employed for determination of pullout capacities of ground anchors installed in Egyptian soils with a good reliability.
Three dimensional (3D) failure pattern of flexible pile due to lateral cyclic loading in sand M. F. Awad-Allah; N. Yasufuku; S. Manandhar
Lowland Technology International Vol 19 No 1, June (2017)
Publisher : International Association of Lowland Technology

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In this paper, a set of small-scale laboratory single flexible pile model was conducted in a medium dense Toyoura sand environment under the effect of cyclic lateral loads. Digital images were captured for the plastic deformations of the soil during the lateral loading from the top of the testing chamber. Combination of photo image analysis and analytical cyclic p-y curve methods was implemented for estimating the three dimensional (3D) failure zone adjacent to pile shaft. The 3D failure pattern of the soil around single pile shaft was investigated through two steps, including: (1) determination of the range of lateral plastic deformations at the top of ground surface in perpendicular and parallel directions of cyclic loads; and (2) determination of the point of rotation (zero displacement) along the pile shaft. Experimental results showed that a conical passive zone of plastic deformations is established around pile shaft due to applying two-way lateral cyclic loading at pile head. Based on the findings, design considerations for piles subjected to lateral cyclic loading have been introduced.
Co-Authors N. Yasufuku S. Manandhar