Abstract: This paper presents results of a geotechnical investigation for two proposed retaining structures at a berth facility in the Port of Los Angeles，California，U． S． A． These retaining structures are needed for excavation of the existing dike slope to accommodate two Islander Barges． Based on the data obtained from a field exploration and laboratory testing program，the project site is underlain by sands and silty sands interbedded with silts and clay layers． The site is liquefiable under both the Operating Level Earthquake ( OLE) event ( a Magnitude 5． 5 event with a peak acceleration of 0． 28g) and the Contingency Level Earthquakes ( CLE) event ( a Magnitude 6． 5 event with a peak acceleration of 0． 52g) ． The retaining structures were proposed to consist of steel sheet piles with a combination of AZ-king piles and AZ-intermediary piles． Using the lateral pressure diagrams under both the static and OLE conditions，limit equilibrium analyses were performed to provide recommendations on the pile lengths and section sizes．

Key words: geotechnical design, retaining structure, berth facility, operating level earthquake ( OLE) , contingency level earthquakes ( CLE)

摘要： 介绍了美国加州洛杉矶港口停靠设施两种支挡结构的岩土工程勘探和设计成果，为了在码头提供两个驳船 停靠点，要对现有堤坝边坡进行开挖，开挖后的边坡需要有支挡结构支撑。根据现场勘察和室内试验数据，项目地 基为砂、泥质砂和黏土层，场地在运行地震水平下(震级5．5，峰值加速度0．28g)和偶发性地震水平下(震级6．5，峰 值加速度0．52g)将会发生液化现象。建议支挡结构采用AZ型中心桩和AZ型辅助桩结合的钢板桩，并采用静力和 运行震动水平共同作用下的侧压力分布图和极限平衡法分析确定桩长和截面尺寸。

关键词: 土工设计, 支挡结构, 港口停靠设施, 运行地震水平, 偶发性地震水平