基于Meyerhof机构的吸力式沉箱基础抗拔承载力极限分析上限解  

Upper bound solution of limit analysis of uplift bearing capacity of suction caisson foundation based on Meyerhof mechanism

作　　者：朱文波[1,2] 戴国亮[1,2] 龚维明[1,2] 赵学亮[1,2] Zhu Wenbo;Dai Guoliang;Gong Weiming;Zhao Xueliang(School of Civil Engineering,Southeast University,Nanjing 210096,China;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学土木工程学院,南京210096 [2]东南大学混凝土及预应力混凝土结构教育重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2018年第5期828-833,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家重点研发计划资助项目(2017YFC0703408);国家自然科学基金资助项目(51478109;51678145);浙江省交通运输厅科研计划资助项目(2014H10)

摘　　要：为了研究吸力式沉箱基础上抗拔荷载作用下的极限承载力上限解,构建出反向Meyerhof破坏模式.根据极限分析上限定理,引入反向地基承载力,基于Meyerhof破坏模式,将原基础下的主动区变为被动区,对数螺旋线方向相反且延伸至沉箱侧壁,建立了相应的机动许可速度场,推导出理论上更为合理的吸力式沉箱基础极限抗拔承载力上限解.分析了上限解与黏聚力、内摩擦角、摩擦系数以及基础下地基反向承载力之间的关系.采用Matlab软件编程计算出上限解,并与文献中的试验数据进行对比分析.结果表明,上限解与试验值的误差最大值为28%,最小值为9%,从而证明了破坏模式的合理性及所提方法的适用性.To study the upper bound solution of the ultimate bearing capacity of the suction caisson foundation under the vertical uplift load,a reverse Meyerhof failure mode is constructed.According to the upper bound theorem of limit analysis,the reverse bearing capacity is introduced.Based on the Meyerhof failure mode,the active area under the foundation is turned into the passive area and the spiral is extended inversely to the side of the caisson.The upper bound solution of the bearing capacity of the suction caisson foundation is derived by establishing the corresponding kinematical admissible velocity field.The relationship between the upper bound solution and the cohesion,the internal friction angle,the friction coefficient and the reverse bearing capacity of foundation are analyzed.The upper bound solution is calculated by using Matlab software and compared with the experimental data in the literature.The results show that the errors between the upper bound solution and the experimental data are from 9%to 28%,proving that the reverse Meyerhof failure mode is reasonable and the method is applicable.

关 键 词：吸力式沉箱基础 Meyerhof破坏模式 极限承载力 上限定理 

分 类 号：TU473[建筑科学—结构工程]