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Christos Anagnostopoulos - One of the best experts on this subject based on the ideXlab platform.
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lateral bearing capacity of rigid Piles near clay slopes
Soils and Foundations, 2013Co-Authors: Konstantinos Georgiadis, Michael C. Georgiadis, Christos AnagnostopoulosAbstract:Abstract Analytical equations were derived to determine the undrained lateral bearing capacity of rigid Piles in cohesive soil. Piles in level ground and Piles placed at a distance from the crest of a slope were examined, taking account of the effect of the adhesion at the Pile–soil interface. The derived analytical solutions were used to develop charts relating the lateral Pile capacity to the Pile length/Diameter ratio, the Pile–soil adhesion, the distance of the point of load application from the ground to the Pile Diameter ratio, the inclination of the slope and the distance of the Pile from the crest of the slope to the Pile Diameter ratio. They were also used to derive a reduction factor which, when multiplied by the lateral bearing capacity for level ground, gives the bearing capacity of the same Pile near a slope. In addition, a critical non-dimensional distance between the Pile and the crest of the slope, at which the bearing capacity approaches that for a level ground, was determined. The bearing capacity charts obtained for level ground were compared to the classic Broms' charts and to others derived using several different lateral earth pressure distributions along the Pile. Comparisons were also made between the results of the proposed method for Piles near slopes and those obtained from charts based on upper bound calculations. Finally, the proposed new method was validated through a comparison with the results of a large number of Pile load tests, in which a remarkable agreement was observed between the analytical results and the measurements.
Jing-wen Chen - One of the best experts on this subject based on the ideXlab platform.
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An Investigation into the Effect of Scour on the Loading and Deformation Responses of MonoPile Foundations
Energies, 2017Co-Authors: Wei Chen Tseng, Yu Shu Kuo, Jing-wen ChenAbstract:Severe foundation scour may occur around monoPile foundations of offshore wind turbines due to currents and waves. The so-called p-y curves method is suggested in the existing design recommendations to determine the behavior of monoPiles unprotected against scour and the reduction of effective soil stress is accounted for by the extreme scour depth. This conservative design approach does not consider the geometry of the scour hole and the effect of Pile Diameter on the soil resistance. An underestimated foundation stiffness would be obtained, thereby influencing the predicted overall response of the support structure of an offshore wind turbine. In this study, we calculated the load-deformation response and foundation stiffness of a monoPile when scour occurred. The influence of Pile Diameter on the initial modulus of subgrade reaction, and the modification of the ultimate soil resistance of a monoPile subject to scour are evaluated. The commercial software BLADED was used to simulate the dynamic response of the reference offshore wind turbine with monoPile unprotected against scour at Chang-Bin offshore wind farm in Taiwan Strait. The results showed that when the p-y curve suggested by existing design regulation was used to calculate the load-deformation response, the foundation stiffness was underestimated where the scour depth was greater than the Pile Diameter, but the foundation stiffness was overestimated when the scour depth was less than the Pile Diameter.
Konstantinos Georgiadis - One of the best experts on this subject based on the ideXlab platform.
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lateral bearing capacity of rigid Piles near clay slopes
Soils and Foundations, 2013Co-Authors: Konstantinos Georgiadis, Michael C. Georgiadis, Christos AnagnostopoulosAbstract:Abstract Analytical equations were derived to determine the undrained lateral bearing capacity of rigid Piles in cohesive soil. Piles in level ground and Piles placed at a distance from the crest of a slope were examined, taking account of the effect of the adhesion at the Pile–soil interface. The derived analytical solutions were used to develop charts relating the lateral Pile capacity to the Pile length/Diameter ratio, the Pile–soil adhesion, the distance of the point of load application from the ground to the Pile Diameter ratio, the inclination of the slope and the distance of the Pile from the crest of the slope to the Pile Diameter ratio. They were also used to derive a reduction factor which, when multiplied by the lateral bearing capacity for level ground, gives the bearing capacity of the same Pile near a slope. In addition, a critical non-dimensional distance between the Pile and the crest of the slope, at which the bearing capacity approaches that for a level ground, was determined. The bearing capacity charts obtained for level ground were compared to the classic Broms' charts and to others derived using several different lateral earth pressure distributions along the Pile. Comparisons were also made between the results of the proposed method for Piles near slopes and those obtained from charts based on upper bound calculations. Finally, the proposed new method was validated through a comparison with the results of a large number of Pile load tests, in which a remarkable agreement was observed between the analytical results and the measurements.
Liang Shuting - One of the best experts on this subject based on the ideXlab platform.
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Study on Failure Mode and Ultimate Bearing Capacity of Drilled Pile Tip
Journal of Highway and Transportation Research and Development, 2008Co-Authors: W U Peng, Liang Shuting, Gong Wei-ming, Zhu Jian-min, Zhao Hua-xinAbstract:Based on mindlin solution, stress condition of Pile tip was calculated using numerical integration. Failure surface shape of Pile tip and ultimate tip resistance was obtained according to Mohr-Column failure criteria. Moreover, relationship among failure surface shape of Pile tip, ultimate tip resistance, and Pile length, Pile Diameter, soil characters and so on. The deeper the depth of Pile tip is embedded, the bigger the failure surface is and the greater the ultimate tip resistance is. The bigger the Pile Diameter is, the bigger the failure surface is but the less the ultimate tip resistance is. Failure surface enlarges and ultimate tip resistance increases if intemal friction angle increase. The bigger the soil cohesive strength of Pile tip is, the smaller the failure surface is but the greater the tip resistance is. Poisson£§ s ratio increase, failure surface enlarges and ultimate tip resistance increases. A simplified formula which contains influencing abovementioned factor was given. At last, some Pile test results were used to obtain variety range of construction coefficient.
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Study on Bearing Characters of Super-long Single Pile Using 3D FEA Method
Journal of Highway and Transportation Research and Development, 2006Co-Authors: Liang ShutingAbstract:For studying the difference of bearing characters between super-long Pile and common Pile,bearing characters of super-long single Pile was studied by using ABAQUS program based on FEA-load transfer hybric method.How Pile length and Pile Diameter influence bearing characters of Pile was studied in detail respectively.A conclusion was made that the longer the Pile,the higher the Pile bearing capacity is and the less the displacement of Pile head is under the same load;the bigger the Pile Diameter,the lower Pile bearing capacity would be.Load-displacement curve of Pile head varies gradually.Compression of Pile was also analyzed,showing that compression of Pile increases as Pile length increases and compression of Pile is in proportion with load on Pile head approximately.But the trend is nonlinear,in other words,compression of Pile increases faster than the increase of load on Pile head if Pile is longer.
Wang Ji-ming - One of the best experts on this subject based on the ideXlab platform.
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Study on Super-long Pile's Standard Value of Vertical Ultimate Bearing Capacity of Single Pile In Nantong
Supervision Test and Cost of Construction, 2010Co-Authors: Wang Ji-mingAbstract:The references of formulating standard basically are long and short Piles' test materials,and the standard said the method using single bridge cone penetration test to calculate pre-cast Pile's standard value of vertical ultimate bearing capacity needs 275 Piles,the number of Piles' length longer than 50m is just 3,about 1.1% of the all,the biggest Pile Diameter is 550mm.If the length of Piles is longer than 50m,Pile Diameter is more than 550mm in Nantong,whether the standard can be used to analyze super-long Pile's standard value of ultimate bearing capacity of single Pile? Does the Pile Diameter affect the vale of side friction of the Pile? And what about the accuracy of the calculation result? The paper compared and analyzed the calculation result of 3 kinds of Piles,9 super-long Piles' standard value of ultimate bearing capacity of single Pile to field vertical loading tests',and summarized several experiences using the standard to calculate super-long Pile's standard value of bearing capacity of single Pile in Nanton,in order to support some references to the design of super-long Piles.