临近海塘大堤的承台深基坑支护结构设计与应用

摘要:

奚家港大桥主墩基坑位于奚家港一线海塘大堤两侧，距海塘大堤防汛墙最小距离为10.7m，最大开挖深度6.74m。海塘大堤与基坑开挖顶面高差为3.3m，海塘大堤上为通行道路，重载车辆较多。奚家巷大桥主墩基坑支护结构设计需要综合考虑坑外恒荷载、堤顶动载、不良地质条件、施工进度等因素，保证基坑变形、海塘大堤结构变形满足规范要求，确保施工安全，满足施工工期要求。

Abstract:

foundation pit of the main pier of Xijiagang Bridge is located on both sides of the seawall embankment along the first line of Xijiagang Bridge. The minimum distance from the flood control wall of the seawall embankment is 10.7m, and the maximum excavation depth is 6.74m. The height difference between the top surface of the seawall embankment and the foundation pit is 3.3m. The seawall embankment is a passageway with many heavy-duty vehicles. In order to ensure that the deformation of the foundation pit and the seawall embankment can meet the requirements of the code, ensure the construction safety and meet the requirements of the construction period, the supporting structure design of the main pier foundation pit of Xijiaxiang Bridge should comprehensively consider the factors such as the external constant load, the dynamic load on the top of the embankment, the bad geological conditions and the construction schedule.