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鉴于新型桶式基础防波堤下沉过程的复杂性,单纯少量的下沉监测并不能全面、细致地反映这一过程。通过对桶体的简化处理,借鉴静压桩的下沉模拟方法,采用ABAQUS有限元软件对桶体的下沉挤土效应进行了模拟分析。通过分析发现,受桶体下沉影响,桶壁附近土体主要受到了桶壁水平挤压作用、紧靠桶壁的竖向挤压及摩擦作用及两桶壁之间盖板的竖向挤压作用。受几种作用的影响,桶壁附近的土体变形可分为紧靠桶壁的下沉区域、离桶壁稍远范围内的相对隆起区及两桶壁之间顶部的下压变形区,而且土体的这些变形决定了桶壁附近土体复杂的应力变化。在挤土效应模拟的基础上,进一步分析了考虑挤土效应对桶体稳定性的影响,挤土效应可增加桶体的稳定性。
Due to the complexity of the sinking process of the new bucket foundation breakwater, a mere amount of subsidence monitoring does not fully and carefully reflect this process. Through the simplified treatment of the barrel and the sinking simulation method of the jacked piles, the ABAQUS finite element software was used to simulate the sinking effect of the barrel. Through the analysis, it is found that the soil near the barrel wall is mainly affected by the horizontal squeezing of the barrel wall due to the sinking of the barrel body. The vertical squeezing and friction immediately against the barrel wall and the vertical squeezing of the cover plate between the two barrel walls Pressure effect. Affected by several effects, the soil deformation near the barrel wall can be divided into the sinking area close to the barrel wall, the relative uplift within a little distance from the barrel wall and the downward pressure deformation zone at the top between the two barrel walls, Moreover, these deformations of the soil body determine the complex stress changes of the soil near the barrel wall. Based on the simulation of squeezing effect, the influence of squeezing effect on barrel stability is further analyzed. The squeezing effect can increase the stability of barrel.