Arrangement optimization of asymmetric Under-reamed pile groups in order to evaluate tensile bearing capacity using numerical method

سال انتشار: 1393
محل انتشار: هشتمین کنگره ملی مهندسی عمران
کد COI اختصاصی: NCCE08_0379
زبان مقاله: انگلیسی
تعداد مشاهده: 1616

نویسندگان

Assistant professor, Department of Civil Engineering, Islamic Azad University, Zanjan Branch, Zanjan, Iran

M. Sc. of Geotechnical Engineering, Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran

چکیده

Under-reamed (Belled) piles are useful methods to increase the bearing capacity in deep foundations. They have some enlarged bases in the stem. They are used to increase tip strength of compressive piles and bearing capacity of tensile piles. Also group arrangement is an effective parameter in application of these piles. In this paper using a finite element software PLAXIS 3D Foundation, the group arrangement was investigated in order to reach the maximum bearing capacity. First the numerical model was validated. Then some groups including 3, 4 and 5 piles with spacing of 4 to 12 times the pile diameter in triangle, square and pentagon plan were subjected to different loadings. Results were shown that increasing the angles in between piles in plan cause decreasing the optimum S/D ratio of them. As a result the spacing/diameter (S/D) ratio for triangle plan of 3 piles with 60º was shown 9, while this number for pentagon arrangement of 5 piles with 108º shown 5.

کلیدواژه ها

Under-reamed Pile group, Arrangement, Angles, Tensile loading, Finite element method

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