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为了计算软土地基上吸力式沉箱的抗拔承载力,在简化极限分析方法的基础上,进一步考虑沉箱侧壁与土之间的界面摩擦效应,提出了一种改进的极限平衡分析方法.通过与相应的三维有限元数值计算以及离心模型试验结果的比较,验证了所提出的改进极限平衡分析方法的合理性.采用该方法探讨了结构长径比、软基的不排水抗剪强度、荷载作用点位置等因素对于沉箱承载力的影响.结果表明,沉箱与土之间的界面摩擦系数对于其抗拔承载力具有一定影响;沉箱的最优系缆点位置一般位于筒顶以下0.55~0.7倍的筒高之间.
In order to calculate the pullout capacity of suction caissons on soft soil foundation, based on the simplification of limit analysis method, an improved limit equilibrium analysis method is proposed by further considering the interface friction effect between the side walls of caisson and soil. Compared with the corresponding three-dimensional finite element numerical calculation and the centrifugal model test results, the proposed method for improving the limit equilibrium analysis is validated. This method is used to investigate the relationship between the structural aspect ratio, the undrained shear strength of soft foundation, The location of action point and other factors on the carrying capacity of caissons.The results show that the interfacial friction coefficient between caissons and soil has an impact on the anti-pull capacity of caissons; the optimal position of caissons in caissons is generally 0.55 ~ 0.7 Times between the tube height.