CAJ | 학술논문

针对某船厂升降试验场地淤泥质土层较厚,钻井平台升降试验时桩靴入泥过深不易拔出情况,提出用灌注桩基承台作为升降试验的基础结构,并通过有限差分软件建立桩-土-承台相互作用模型,进行承载能力状态下预压工况和组合荷载工况的数值模拟。结果表明：灌注桩承台基础可以满足承载力和沉降要求;承台下L/3（L为桩长）范围土体侧摩阻力最多达到0.5倍极限侧摩阻力,桩端上部2L/3范围内侧摩阻力在0.5～1倍极限侧摩阻力之间;在沉降达到5%D（D为桩径）之前,承台可承担10%～20%的荷载。
침대모선엄승강시험장지어니질토층교후,찬정평태승강시험시장화입니과심불역발출정황,제출용관주장기승태작위승강시험적기출결구,병통과유한차분연건건립장-토-승태상호작용모형,진행승재능력상태하예압공황화조합하재공황적수치모의。결과표명：관주장승태기출가이만족승재력화침강요구;승태하L/3（L위장장）범위토체측마조력최다체도0.5배겁한측마조력,장단상부2L/3범위내측마조력재0.5～1배겁한측마조력지간;재침강체도5%D（D위장경）지전,승태가승담10%～20%적하재。
The soft clay in the jack-up platform test site for lifting test is thicker,which may cause the spudcan of drilling platform into mud too deep to lift up,so the method of using the bored pile and caps as the foundation to support the spudcan is proposed.Then,the 3D finite difference program is employed to set up the pile-soil-caps interaction model,and the bearing capacity of the pile groups under preloading and combined loading in ultimate state is evaluated respectively.The results indicate that the pile foundation could meet the bearing capacity and settlement requirements;the pile shaft friction of upper part(below the caps for L/3 distance,L means pile length) is not bigger than half of the ultimate side friction,and the shaft friction of lower part is between half and one time of the ultimate side friction;the proportion of load carried by caps is between 10% and 20% before the settlement of pile groups reaches the value of 5%D(D represents the diameter of the pile).