外海复杂地质码头结构选型

Structural selection of wharf in complex open sea geology

针对外海复杂条件下码头结构选型问题,结合宁波某30万吨级卸船码头工程,根据水文地质特点,从结构形式适应性、施工工艺和工程造价等方面选择斜嵌岩桩和直嵌岩桩两种基桩形式作为研究对象,并采用对比分析法,从技术、经济等方面对斜嵌岩桩和直嵌岩桩进行分析。结果表明,与较大直径的直嵌岩桩相比,在安全经济方面,斜嵌岩桩具有桩径小、结构抗水平荷载能力强、工程造价低的优点,更为经济合理;在斜嵌岩桩施工工艺方面,采用回旋钻机施工质量有较高可靠性;在施工期稳桩措施方面,采用碎石基床稳桩保证嵌岩桩稳定较实用,适应外海施工期相对较短的要求。

This paper aims to study the structural selection of a wharf under complex geological conditions in the open sea.Taking a 300,000-ton unloading wharf project in Ningbo as an example,the paper selects an inclined rock-socketed pile and a vertical rock-socketed pile as research objects according to the structural arrangement adaptability,construction technology,and construction cost with the consideration of hydrogeological characteristics.A comparative analysis method is used to analyze the above two pile arrangements technologically and economically.The results show that compared with the vertical rock-socketed pile with a large diameter,the inclined rock-socketed pile has the advantages of small pile diameter,strong tolerance to horizontal load,and low engineering cost,thus being more suitable and economical.In terms of the construction technology of the inclined rock-socketed pile,rotary drilling rigs have high reliability in construction quality.Regarding pile stabilization measures during the construction period,it is practical to use the gravel foundation bed to ensure the stability of the rock-socketed pile,which is suitable for the relatively short construction period in the open sea.