新型桶式基础防波堤下沉分析及其对稳定性的影响

Installation of new bucket foundation breakwater and its influence on stability

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。

In fight of the complexity of the installation process of the new bucket foundation breakwater, just some monitoring data cannot reflect this process roundly and particularly. By simplifying the bucket and using the simulation method for the installation of jacked piles, ABAQUS is used to simulate and analyze the soil-squeezing effect of the bucket. Through analysis, it is found that under the influence of the installation of the bucket, the soil near the bucket wall is affected by the horizontal squeezing effect, the soil close to the bucket is affected by the vertical squeezing and the friction effect, and the soil under the cover plate of the bucket between two bucket walls is affected by the vertical squeezing effect. Under the influences of the above effects, the deformations of the soil near the bucket wall can be divided into the submergence zone close to the bucket wall, the relative upheaval region zone a little far away from the bucket wall and the compression zone at the top of the soil between two bucket walls. These deformations cause the complex changes of the soil stress near the bucket wall. Based on the simulation of the soil-squeezing effect, its influence on the stability of the bucket is also analyzed, and the soil-squeezing effect can enhance the stability of the bucket.