中文摘要：

成都某大桥水下筑岛深基坑工程因河床面浅覆不均匀卵石层,钢板桩无法插打入卵石层而形成不对称支护体系,钢板桩围堰的受力变形规律不同于常规基坑,施工风险加大。结合FLAC2D数值模拟与监测数据、理论计算方法比较对该基坑的受力变形特点及安全稳定性进行分析研究。现场施工情况表明该施工方案安全可行。

英文摘要：

Because of the uneven bed surface covered by shallow gravel layer, for a deep foundation excavation engineering of a bridge underwater building in Chengdu, the steel sheet pile can not be inserted into the gravel layer and formed the asymmetric supporting system, it also lead to the steel sheet pile cofferdam of the stress and deformation rules different from conventional excavation, resulting in increasing risk of construction. In this paper, the stress and deformation characteristics of the foundation excavation are analyzed by FLAC2D numerical simulation method, monitoring data and theoretical calculation method. The site construction shows that the construction scheme is feasible and safe.