大直径薄壁圆筒直立堤变形机理分析

Deformation mechanism analysis of large diameter cylinder vertical breakwater

本文在对大直径薄壁圆筒直立堤变形特征详细调查的基础上,结合钻探、测量、水下检查及不利因素分析,对薄壁圆筒直立堤中部及拐角部位的变形特征和变形机制进行了研究,并结合变形机制确立了补救措施。研究表明:大直径薄壁圆筒的倾斜与筒内填料高度变化之间有着相互因果关系;中部圆筒变形是筒内填料原始缺失,抗倾能力低所致,回填筒内填料即可保障运行;拐角位置圆筒直立堤变形是因为该位置波浪作用大,抗冲刷能力低,导致堤前护坦石缺失、基床受损,圆筒产生变形后,顶部与圆筒结构相独立的胸墙在圆筒变形及重力的双重作用下产生了协调变形,修复堤前护坦石并柔性处理胸墙间接缝即可保障运行;该圆筒直立堤的变形均非破坏性的变形,在采取一定的补救措施后,即可抑制变形发展,保证圆筒直立堤正常运行。

Based on the investigation of deformation characteristics of large diameter cylinder vertical breakwater,with drilling,underwater investigation and analyses of unfavorable factors,the deformation characteristics and mechanism of both the middle and southeast corner of the breakwater were studied.The analyses show that：（1）The incline and the fill height of the cylinder have a relative cause and effect relationship.（2）The fill height of cylinder in the middle of breakwater was not enough,so the cylinder inclined undert he soil pressure and the force of wave.The cylinder can work normally after back filling.（3）At the southeast corner of breakwater,the effect of wave is strong,and the protected stone was washed out,thes trength of the cylinder bed is affected and the cylinder slightly inclined,so the parapet deformed to get a new balance.The cylinder can work normally if the front rock back filled and the joint of two parapet filled with flexible material.（4）The deformation of the cylinder vertical breakwater was not devastating,after being remedied the breakwater can work normally.