堆载作用下装配式钢圆筒稳定及变形分析

Stability and deformation of prefabricated steel cylinder under loading effects

针对深厚软土地基及堆载作用的复杂条件,采用装配式钢圆筒护岸结构,开展结构稳定及变形分析。首先确定合理的结构方案,并通过条分法分析护岸整体稳定性,其次采用数值模拟法分析钢圆筒在堆载作用下的变形特性,最后通过离心模型试验验证装配式钢圆筒护岸的可靠性。结果表明:在深厚软土地基条件下,利用深插式钢圆筒截断堆载作用下的深层滑动面,保障护岸的整体稳定;当堆载作用距离护岸轴线120 m时,钢圆筒顶部位移约10 cm,筒体向海侧倾斜0.09°。通过堆载距离的控制,其作用下钢圆筒变形对重要建筑物结构影响较小,为钢圆筒护岸建设提供理论支撑。

In view of the complex conditions of deep soft soil foundation and loading effect,this paper analyzes the stability and deformation of a prefabricated steel cylinder revetment structure.Firstly,the paper determines a reasonable structural scheme and analyzes the overall stability of the revetment through the slice method.Secondly,the paper adopts a numerical simulation method to study the deformation characteristics of the steel cylinder under loading effects.Finally,the paper verifies the reliability of the prefabricated steel cylinder revetment by a centrifuge model test.The results show that under the condition of a deep soft soil foundation,the deep sliding surface under loading effects can be truncated by a deeply inserted steel cylinder to ensure the overall stability of the revetment.The top displacement of the steel cylinder is about 10 cm,and the cylinder tilts to the seaside by 0.09°when the loading effect is 120 m away from the revetment axis.By controlling loading distance,the deformation of the steel cylinder under loading effects has a slight influence on the structure of important buildings,which provides theoretical support for constructing steel cylinder revetments.