墙桩间距对遮帘式板桩码头结构遮帘效应的影响分析
Influence analysis of wall pile spacing on barrier effect of sheet-pile barrier wharf structure

为了研究墙桩间距对遮帘效应的影响,利用京唐港32#原型观测试验揭示了遮帘式板桩码头结构的遮帘效应.分别采用离心模型试验和有限元模拟,对比码头开挖前后以及不同墙桩间距下前墙平均侧土压力系数、土压力分布及水平位移的变化情况.结果表明,码头开挖前,无遮帘桩情况下,前墙上平均侧土压力系数最大,且随墙桩间距的增大而减小;码头开挖后,随着墙桩间距的增大,前墙水平位移、前墙陆侧上土压力以及前墙与遮帘桩的相对水平位移增大,前墙陆侧对应桩间侧与对应桩侧上的土压力差值则逐渐减小.在实际工程施工条件允许的情况下,墙桩间距越小,遮帘式板桩码头结构的遮帘效应越明显.
In order to study the influence of wall pile spacing on barrier effect, the Jingtang 32# prototype observation experiment was carried out to reveal the barrier effect of sheet-pile barrier wharf structure. The centrifuge experiments and the finite element models were used to contrast the changes of the average lateral earth pressure coefficient, the distribution of earth pressure and the horizontal displacement on the front wall before and after excavation with different wall pile spacings. The results show that before excavation and without barrier piles, the average lateral earth pressure coefficient on the front wall can achieve the maximum value, and it decreases with the increase of the wall pile spacing. After excavation, with the increase of the wall pile spacing, the horizontal displacement, the earth pressure on the front wall and the relative horizontal displacement between the front wall and the barrier piles increase, but the difference value of the earth pressure between corresponding pile lateral and piles decreases. With the permission of the actual engineering conditions, the barrier effect of the sheet-pile barrier wharf structure becomes more obvious with the decrease of the wall pile spacing