Combined Bearing Capacity of Spudcans on a Double Layer Deposit of Strong-Over-Weak Clays

作者：YIN; Qilin; DONG; Shengcombinedbearingcapacitycircularspudcanlayeredclaysverticalloadlevelstrengthratiohardlayerthickness

摘要：An extreme sea storm process can lead to a jack-up rig under the combined loading condition of vertical load(V),horizontal load(H),and moment(M)to have stability problems.This paper presents the analysis of combined bearing capacities of a circular spudcan on layered clays with a strong layer overlying a comparatively weaker layer.Numerical models combined with displacement-based load tests,swipe tests,and constant ratio displacement probe tests are adopted to calculate the uniaxial bearing capacities,failure envelopes in combined V-H,V-M planes,and failure envelopes in a combined V-H-M load space,respectively.A parametric study on the effects of vertical load level V,the layer strength ratio su,t/su,b,and the hard layer thickness t1 on the bearing capacities is then performed.Results show that the vertical load level is a key factor that influences the values of H and M and the size of the H-M failure envelope.The existence of the underlying weak clay decreases the bearing capacities in all directions,and the vertical capacity Vult is affected more than the horizontal(Hult)and moment(Mult)capacities based on a single uniform deposit.The influence of the underlying weak clay on H-M failure envelope is mainly shown where H and M are coupled in the same direction.In contrast,little difference is observed when H and M are coupled in opposite directions.

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