西非某矿石码头桩基结构设计优化*
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中国港湾重大科技研发项目(2023-ZGKJ-ZDYF-04)


Optimization design of pile foundation structure for ore terminal in West Africa
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    摘要:

    西非某矿石码头项目处于内河入海口,项目位置地质为埋深较浅的高强度微风化花岗岩,岩石强度较高(单轴抗压强度约为83 MPa),岩层上覆盖厚12~20 m的软弱淤泥、黏土和砂层。在该地质条件下,在前端工程设计(FEED)中为确保桩基承载力和规避地质风险,规定引桥桩基嵌岩深度4.5 m,码头嵌岩深度8 m,码头总嵌岩长度约3 852 m,引桥总嵌岩长度约1 134 m。在高强度花岗岩中进行嵌岩施工难度大、工效低,对项目工期是巨大挑战。在工程总承包(EPC)阶段,通过施工图详细勘察、水文条件和工艺条件细化分析、打入桩在岩层顶面承载力计算的国内外规范研究、码头和引桥结构的精细化计算、方案结合的设计和检测、现场实际检测结果的论证,实现了优化或取消引桥桩基嵌岩、降低码头桩基嵌岩深度、优化码头排架间距及桩基和梁板的连接方式,从而达到降低桩基嵌岩工程量和施工难度、满足履约工期的目的,并获利近千万美元。

    Abstract:

    The ore terminal project in West Africa is situated at the estuary of an inland river.The geological conditions at the terminal location consist of shallow-buried,high-strength slightly weathered granite with a uniaxial compressive strength of approximately 83 MPa.This rock layer is overlain by 12-20 m of soft silt,clay,and sand stratas.In the front end engineering design(FEED),to ensure pile foundation bearing capacity and mitigate geological risks,the owner specified a socket depth of 4.5 m into the rock for the access trestle piles and 8 m for the wharf piles,resulting in a total rock-socketed length of 3,852 m for the wharf and 1,134 m for the access trestle.However,constructing sockets in high-strength granite proves extremely challenging,with low efficiency,posing significant risks to the project schedule.During the engineering,procurement,construction(EPC)phase,we optimize the design through detailed geotechnical investigations,refined analyses of hydrological and construction conditions,comparative studies of domestic and international codes for calculating the bearing capacity of driven piles at the rock surface,precise structural calculations for the terminal and access trestle,integration of design and testing protocols,and validation with on-site test results.These efforts lead to the elimination of rock sockets for the access trestle piles,a reduction in the wharf pile socket depth,and optimization of the wharf bent spacing and pile-to-beam connections.Consequently,the rock-socketed quantity and construction complexity are significantly reduced,and the project schedule is achieved,with nearly ten million dollars in profit.

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周 顶,李昊天,王安华,等.西非某矿石码头桩基结构设计优化*[J].水运工程,2025(9):76-83.

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  • 在线发布日期: 2025-09-16
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