淤泥质底床上沉入式大圆筒施工期在波浪作用下稳定性的实验研究

Experimental study on stability of cylinder sunken set on muddy seabed under the action of wave

本文对淤泥海床上的沉入式大圆筒结构施工期(即大圆筒已沉放到位,但筒内尚未填筑填料)在波浪作用下的稳定性进行了实验研究。研究中采用了系列模型延伸法,进行了3组不同尺度的大圆筒模型和3种不同重度的淤泥底质的系列试验。研究中将大圆筒顶部的水平位移达到4‰床面以上圆筒高度,确定为临界稳定状态,对应的波浪条件为临界稳定条件。通过实验时开敞水域中的单个大圆筒以及靠海岸的双筒并列等情况分别提出了稳定状态判断指标。

The stability of large scale cylinder sunken set on muddy seabed under the action of wave during the process of construction is studied experimentally. Series model test with 3 diameters of cylinder and 3 kinds of muddy bed material are carried out.The standard of critical stability is defined as the displacement of the top of cylinder is less than 4‰ of its height. According to the experiment data the discrimination indexes of stability in condition of single cylinder or twin cylinders in open sea area and single or twin cylinders at seashore are determined respectively.