新型桶式基础防波堤桶体阻力分析

Numerical analysis of bucket resistance of new bucket foundation breakwater

包括桶壁、隔墙摩阻力和桶底端阻力的桶体阻力是维持桶体稳定性的一个重要因素。外侧桶壁摩阻力与桶土相对位移及接触状态有关,内侧桶壁和隔墙摩阻力与桶土相对位移有关,桶底端阻力与桶土接触状态有关。波浪荷载作用下,海侧上部的外侧桶壁与土体脱离,下部产生相对土体的向上位移,陆侧桶壁则相反;海侧内侧桶壁与隔墙产生相对桶内土体的向上位移,陆侧则相反;海侧桶体底部与土体脱离,陆侧则挤压土体。波浪荷载作用下,在绕桶体转动中心发生向上位移的迎浪侧,随荷载水平增加,桶壁与隔墙摩阻力由桶体自重作用下的正摩阻力减小变为负摩阻力,桶底端阻力则减小直至为零;在绕桶体转动中心发生向下位移的背浪侧,桶体阻力在桶体自重的基础上增加。

The resistance including the frictional resistance on the bucket wall and the partition wall and the end resistance at the bottom of the bucket is an important factor to maintain the stability of the bucket. The frictional resistance on the outside bucket wall is connected with the relative displacement and the contact status between the bucket and the soil. The frictional resistance on the inside bucket wall and the partition wall relates with the relative displacement between the bucket and the soil, while the end resistance at the bottom of the bucket is connected with the contact status between the bucket and the soil. Under wave loads, the upper outside bucket wall breaks away from the soil, and the lower bucket wall generate upward displacement against the soil at the sea side, while the bucket wall at the land side is opposite. At the same time, the inside bucket wall and the partition wall generates upward displacement at the sea side against the soil, and the situation is opposite at the land side, while the bottom breaks away from the soil at the sea side and it compresses the soil at the land side. At the head side of the waves where an upward displacement is generated around the rotating center of the bucket, the frictional resistance on the bucket wall and the partition wall changes from the positive frictional resistance under self-weight to the negative one, and the end resistance at the bottom of the bucket reduces until to zero. At the same time, at the reverse side of the waves where a downward displacement is generated around the rotating center of the bucket, the resistance of the bucket increases based on its self-weight.