【摘要】 当负压沉箱被用作深水管汇或管道终端基础时,其长径比常介于1～2之间,而目前的沉箱复合承载力包络面表达式大都针对长径比不超过1的情况,少数覆盖长径比大于1的研究又不适用于土体表层强度非零的情况。采用有限元方法,模拟竖向力、水平力和弯矩共同作用下沉箱基础的响应,采用Probe加载模式获得沉箱的复合承载力包络面。进行大量变动参数分析,针对长径比为1～2的沉箱,讨论了长径比和土体强度分布对单向承载力和包络面的影响,并给出了预测沉箱复合承载力的归一化表达式。更多还原

【Abstract】 When they areused to support manifolds and terminals of pipelines in deep waters, the suction caissons are usually with length to diameter ratios of 1～2. However, most existing equations of capacity envelopes for suction caissons are in terms of length to diameter ratios less than 1, while few equations for the ratio larger than 1 cannot be used for soil with nonzero undrained strength at mudline. A large number of finite element analyses were conducted to study the response of cais-sons under combined vertical force, horizontal force and moment, with the probe loading approach used to obtain the capacity envelopes. For suction caissons with length to diameter ratio of 1～2, the influences of the length to diameter ratio and the soil strength profile on the uniaxial capacities and envelopes under combined loading conditions were explored through parametric study, and a normalized equation of capacity envelope was further provided.更多还原