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介绍了建筑黄河油港,采用板桩结构码头设计工艺和施工技术,码头建成投产至今,经历了百扯遇强台风考验,为在淤泥质开敞海底建设板桩码头取得了成功经验。 相似文献
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在开敞海域,淤泥底质建造板桩结构码头的实践与分析 总被引：1，自引：0，他引：1
本文主要以黄河海港建港的经验与实践,介绍板桩结构码头的设计特性和施工过程的技术措施,提供了在开敞海域下淤泥底质建港的实践经验和应用前景。 相似文献
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介绍了广州港新沙港区板桩码头主要内力计算方法及常用软件,结合设计过程、工程地质情况、现场实际施工情况,着重从受力合理性、施工便利性、节省造价方面,对提出的钢板桩方案、钢管板桩方案进行比较分析,确定了钢管板桩结构更合理,并对优势进行总结。研究表明相对于钢板桩结构,钢管板桩结构在抗弯、抗变形、拉杆拉力和锚碇墙稳定性、对复杂地基(软弱土层较厚、岩层标高较高的地基)适应性、兼顾桩基基础、施工速度等方面更具备优势,且钢管板桩结构可更好的适应码头的大型化和深水化发展,在类似工程设计中可优先采用钢管板桩结构。 相似文献
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我国码头新结构型式综述 总被引：1，自引：0，他引：1
对我国近些年出现的几种新型码头结构进行了分析和综述。导管架码头结构型式是一种新型的结构型式,结构的整体刚度大、水平变位小、透空性好、波浪反射小,在开敞式环境下可适当降低码头面高程;椭圆沉箱墩式结构解决前后不均匀沉降的问题,提高了结构的整体稳定性;内河架空直立墩式结构对大水位差适应能力强,结构紧凑,对水流穿行影响小,装卸作业时泊稳条件好,是内河航道未来的发展方向。 相似文献
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探讨了应用离散元分析方法求解地震荷载下沉箱和背后填土大变形问题的可能性，开发了能描述沉箱的平面形状及沉箱与土体摩擦特性的矩形单元。并通过简单实例分析了地震时沉箱码头的变形，再现了沉箱码头地震灾害的发生过程，为沉箱在地震情况下的大变形分析提供了一种新途径。比较了两种沉箱模型对分析结果的影响，提出了相应的方法。 相似文献
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离岸深水全直桩码头承载性能有限元分析 总被引：1，自引：0，他引：1
全直桩码头是适于软土地基上离岸深水海域的新型高桩码头结构型式,其承载机理与传统高桩码头存在较大差异,且软土地基循环软化效应显著。建立全直桩码头结构与地基相互作用三维弹塑性有限元模型,基于二次开发采用拟静力法对土体循环软化效应进行模拟。通过有限元模型研究全直桩码头的承载特性与破坏模式,并探讨水平极限承载力的影响因素。研究表明水平荷载作用下,基桩的塑性破坏是结构失稳的控制因素,地基土体的承载力对结构水平极限承载力不起决定性作用;竖向荷载作用下,结构竖向极限承载力由地基土体强度决定。研究范围内入土深度对结构水平极限承载力影响不大,但桩壁厚度减小或考虑土体软化后,结构水平极限承载力明显降低。设计中,增加入土深度可有效减小土体软化引起的水平极限承载力降低程度,且应考虑结构腐蚀和土体软化对水平极限承载力的双重降低效应,为钢管桩预留足够的腐蚀富裕量。 相似文献
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具有挡浪设施的高桩码头是国内近年来采用的一种新型水工结构型式，具有防浪、透流、防止泥沙回淤和造价低等优点。根据Wiebel、Kriebel等人的理论分析，结合东营港扩建工程码头的尺度参数，对挡板的透浪系数Kt的计算进行了推导，并与物理模型试验及现行规范进行了比较与讨论。 相似文献
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AbstractWith the large-scale development and utilization of ocean resources and space, it is inevitable to encounter existing submarine facilities in pile driving areas, which necessitates a safety assessment. In this article, by referring to a wharf renovation project as a reference, the surrounding soil response and buried pipe deformation during pile driving in a near-shore submarine environment are investigated by three-dimensional (3D) numerical models that consider the pore water effect. Numerical studies are carried out in two different series: one is a case of a single pile focusing on the effect of the minimum plane distance of the pile–pipe, and the other is a case of double piles focusing on the effect of the pile spacing. 相似文献
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采用灌注桩粱板结构将原有重力式方块小吨级码头改造扩建成为较大吨级码头,是一种投资少,见效快的结构形式。本文介绍了烟台地方港务局1-3号泊位的码头改造工程设计。 相似文献
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High-pile and beam-slab quays have been widely used after several years development.They are mature enough to be one of the most important structural types of wharves in China coastal areas. In order to accommodate large tonnage vessels, wharves should be constructed in deep water gradually. However, conventional high-pileand beam-slab structures are hard to meet the requirements of large deep-water wharf.According to arch''s stresscharacteristics, a new type of wharf with catenary arched longitudinal beams is presented in this paper. The new wharf structure can make full use of arch''s overhead crossing and reinforced concrete compression resistance, improve the interval between transverse bents greatly, and decrease underwater construction quantity. Thus, the construction cost cab be reduced. Take the third phase project of the Yangshan Deep-water Port for example, comparative analysis on catenary arched longitudinal beams and conventional longitudinal beams has been made. The result shows that with the same wharf length and width, the same loads and same longitudinal beam moment, catenary arch structure can improve the interval between bents up to 28 m, decrease the number of piles and underwater construction quantity. 相似文献
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High-pile and beam-slab quays have been widely used after several years development. They are mature enough to be one of the most important structural types of wharves in China coastal areas. In order to accommodate large tonnage vessels, wharves should be eorrstructed in deep water gradually. However, conventional high-pile and beam-slab structares are hard to meet the requirements of large deep-water wharf. According to arch＇ s stress characteristics, a new type of wharf with catenary arched longitudinal beams is presented in this paper. The new wharf structure can make full use of arch＇s overhead crossing and reinforced concrete compression resistance, improve the interval between transverse bents greatly, and decrease underwater construction quantity. Thus, the construction cost cab be reduced. Take the third phase project of the Yangshan Deep-water Port for example, comparative analysis on catenary arched longitudinal beams and conventional longitudinal beams has been made. The result shows that with the same wharf length and width, the same loads and same longitudinal beam moment, catenary arch structure can improve the interval between bents up to 28 m, decrease the nmnber of piles and underwater construction quantity. 相似文献
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斜顶桩驳岸结构是一种深水高桩码头接岸结构型式，驳岸结构后进行高回填将是一个复杂的被动桩与土相互作用的问题。采用平面有限元方法，分别建立了后支撑和前支撑斜顶桩驳岸结构的桩一土相互作用模型，桩基采用梁单元模拟，桩一土界面采用接触对进行模拟，进行了高回填施工过程的仿真分析。将承台侧向位移的数值计算结果与原型观测值进行了比较，吻合较好，并对桩身侧向位移、板桩前后土压力以及位移场进行了分析。结果表明：结构的变形随着施工过程进行而变化，承台最大侧向位移发生在施工过程中；不同驳岸结构的被动土压力分布相似，而主动土压力由于支撑桩的位置不同而有所差别；后支撑桩的桩身挠度相对较大。研究结论可为此类结构的设计及计算提供参考，也可为深水港结构型式的优化提供建议。 相似文献
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考虑软土蠕变导致的土体抗剪强度的衰减效应,建立了软土长期强度模型,用以量化由于土体蠕变导致的土体抗剪强度参数随时间的变化规律。将时变可靠度理论结合有限元强度折减法,提出了考虑软土蠕变对强度影响的高桩码头岸坡时变可靠度算法。采用拉丁超立方抽样方法来改进传统蒙特卡罗法的随机抽样过程,提高计算效率。针对某一岸坡实例,将采用本文算法计算得到的可靠度结果与其他算法评估的结果进行对比分析,验证本文算法的可靠性。最后以我国沿海某高桩码头岸坡为例,基于本文算法评估了该码头岸坡的时变可靠度,分析了岸坡稳定性的时变规律。文中提出的时变可靠度分析方法不仅可以为在役高桩码头岸坡的安全评估提供强有力的技术支撑,同时也能为一些新建工程项目提供一定的参考应用价值。 相似文献
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AbstractThis study investigates the impact of pile cap size, soft layer thickness and pile strength on load transfer and settlement behaviors of embankments supported by floating and fixed T-shaped deep cement mixing piles and conventional DCM piles under volume control. Preliminary investigation is performed by a series of small-scale physical model tests. The results reveal that the differential settlement can be substantially reduced with an enlarging pile cap as a result of larger embankment load transferred to the piles. The extended numerical analysis results demonstrate that the pile efficacy is related to the individual pile bearing capacity, which, in turn, depends on the pile cap size. The soft layer thickness has an insignificant effect on differential settlement but a significant effect on average settlement, while the pile strength plays an important role in differential settlement only when the cap size is not very large. Shape factor of at least 3.0 is recommended to ensure the reduction in differential settlement and minimize the effect of the change in pile strength. 相似文献
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海上复杂地质条件下大直径钢管桩时效性试验研究 总被引：1，自引：1，他引：0
通过对3根海上复杂地质条件下的大直径钢管桩采取高应变初打与不同休止时间复打相结合的试验方法,得到不同休止时间钢管桩承载力、侧阻力及端阻力大小,以此对不同桩侧土及持力层对钢管桩时效性的影响进行了研究。研究结果表明:1)钢管桩承载力时效性现象明显,且随时间增长迅速; 2)钢管桩侧阻力的恢复系数远大于端阻力; 3)桩侧黏性土强度的恢复是钢管桩侧阻力增加的主要原因; 4)砂土层虽提供的侧阻力较大,但其对侧阻力增长的贡献不如黏性土; 5)持力层越硬,端阻力与承载力的恢复性越差。 相似文献
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Samuel G. Paikowsky Robert V. Whitman Mohsen M. Baligh 《Marine Georesources & Geotechnology》2013,31(3):213-230
Abstract Open‐pipe piles are widely used for offshore structures. During the initial stage of installation, soil enters the pile at a rate equal to the pile penetration. As penetration continues, the inner soil cylinder may develop sufficient frictional resistance to prevent further soil intrusion, causing the pile to become plugged. The open‐ended pile then assumes the penetration characteristics of a closed‐ended pile. The mode of pile penetration significantly alters the soil‐pile interaction during and after installation. This affects the ultimate static bearing capacity (mainly in granular materials), the time‐dependent pile capacity (in clays), and the dynamic behavior and analysis of the piles. Following a summary demonstrating the effects of pile plugging, a review of the common view of offshore pile plugging is undertaken. The interpretation of plugging by referring to the average plug length has led to the erroneous conclusion that in most piles significant plugging action does not occur. Establishment of an analogy between soil samplers and open‐ended piles enabled correct identification of plugging by referring to the incremental changes in plug length. Examination of case histories of plugging of offshore piles revealed that beyond a certain penetration depth‐to‐diameter ratio, most piles are plugged. 相似文献