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RISS 인기검색어
- 검색키워드
- 저자 : Kiyoshi Omine (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Application of Cavity Expansion Theory for Evaluating Skin Friction of Tapered Piles in Sands
Suman Manandhar,Noriyuki Yasufuku,Kiyoshi Omine 한국지반공학회 2012 international journal of geo-engineering Vol.4 No.3
This paper discusses the effects of tapered pile penetration in sandy soils after having obtained evidence of its merits over straight-sided cylindrical piles in evaluating skin friction. Experimental model tests confirmed that a slight increase in the angle of tapering also led to a major increase in skin friction. Based on this evidence, the authors adopted an analytical solution to evaluate the skin friction of tapered piles, The cylindrical cavity expansion theory is an appropriate analytical closed-form solution in determining the skin friction of tapered piles at different phases of soils at different relative densities, A new arrangement was inserted by introducing a stress-dilatancy relationship in the ideal elastic-plastic model of cavity expansion application, n general. for easy computation, he angle of internal friction or dilatancy angle is assumed to he constant to compute the skin friction. This drawback was improved upon and both properties considered in evaluating skin friction at each depth iteratively. This paper assesses the results of paranietric studies on different types of model tests, prototype tests and real type pile tests in order to predict the proposed model. The proposed extended model validates the determination of skin friction using a stress-dilatancy relationship.
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Proposed Analytical Solution for Estimating of Ultimate Lateral Capacity of Piles in Sandy Soils
Fawzyawad Allah,Noriyuki Yasufuku,Kiyoshi Omine 한국지반공학회 2011 international journal of geo-engineering Vol.3 No.4
This paper presents an approximate analytic solution for the problem of laterally loaded piles in a homogeneous cohesionless soil. A simple method has been introduced for estimating ultimate horizontal resistance (including net frontal earth pressure and side shear resistance) to piles in sandy soil. The differential equation of the problem of a single laterally loaded pile has been formulated based on beam on elastic foundation technique (Winker`s model), and a perfectly plastic soil response was assumed to represent the behavior of soil medium during horizontal loading of a pile. Moreover, a comparison study was carried out between a new proposed approach for predicting the ultimate lateral resistanceand those widely used methods, including: Prasad and Chari (1999), Verruijt (1995), and Broms (1964). Twenty case studies of experimental tests on model of single pile conducted by the authors and collected from the literature were used in this comparison. The calculated values of ultimate horizontal loads by using the new approach agree well with those obtained from the experimental tests with average error of -13.10% while other methods gave significantly higher average errors. Furthermore, to evaluate the accuracy and predictability of the proposed method, a statistical analysis study has been performed using four statistical criteria. The outcomes indicate that this new proposed method yields remarkably satisfactory results.
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