洛杉矶港口停靠设施支挡结构的土工设计(英文)
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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。
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.
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.
引文
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[2]Earth Mechanics Inc..Ground Motion and Fault Study Report,West Basin,Prepared for Port of Los Angeles[R].Los Angeles:EMI,2001.
[3]Seed H B,Idriss I M,Arango I.Evaluation of liquefaction poten-tial using field performance data[J].Journal of Geotechnical Engi-neering,ASCE,1983,109(3):458-482.
[4]Youd T L,Idriss I M.Liquefaction resistance of soils:Summaryreport from the 1996 NCEER and 1998 NCEER/NSF Workshopson evaluation of liquefaction resistance of soils[J].Journal ofGeotechnical and Geoenvironmental Engineering,ASCE,2001,127(10):817-833.
[5]Tokimatsu K,Seed H B.Evaluation of settlement in sand due toearthquake shaking[J].Journal of Geotechnical Engineering,ASCE,1987,113(8):861-878.
[6]Seed H B,Harder L F.SPT-based Analysis of Cyclic Pore Pres-sure Generation and Undrained Residual Strength[C]//Universityof California at Berkeley:Proceedings of H.Bolton Seed MemorialSymposium.California:BiTech Publishers,1990.
[7]NAVFAC.Foundations and Earth Structures:Design Manual 7.02[M].Alexandria,Virginia:Naval Facilities Engineering Com-mand,1986.
[8]Working Group No.34 of the Maritime Navigation Commission,In-ternational Navigation Association.Seismic Design Guidelines forPort Structures[M].Nederland:Swets&Zeitlinger B.V.Lisse,2001.
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