科研之友
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摘要
This paper presents failure mechanisms of the soil at the caisson-tip with fillet during suction-assisted penetration of suction caissons in undrained clay.Theoretical solutions of resistance factor Nc of the caisson-tip are obtained in terms of the caisson-tip geometry ratio of the flat section of the caisson-tip to the caisson wall thickness m/t and adhesion factors αi along inside of caisson wall and αb at the base of the caisson-tip.It is indicated that the factor Nc increases with the increase of m/t,αi and ab.The resistance factors Nc for the rough base(αb=1) are larger by 0.57than that for the smooth base(αb=0).Besides,the factors Nc of caisson-tip with flat base(m=t) are larger by 1.14 than that with full internal fillet(m=0).The required suction to penetrate suction caissons with various fillets is obtained in terms of the force equilibrium in vertical direction.The finite element limit analysis and centrifuge model test results are used to verify the rationality of the presented failure mechanisms and theoretical predictions.
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