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首页> 外文会议>Deep Foundations Institute 28th Annual Conference on Deep Foundations: Deep Foundations in Compressible Soil and Soft Rock >DESIGNED, PDA ASSISTED LOAD TESTED, AND CONSTRUCTED PILE FOUNDATION PROVIDES AN ECONOMICAL FOUNDATION SOLUTION - A CASE HISTORY
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DESIGNED, PDA ASSISTED LOAD TESTED, AND CONSTRUCTED PILE FOUNDATION PROVIDES AN ECONOMICAL FOUNDATION SOLUTION - A CASE HISTORY

机译：设计，通过PDA进行负载测试以及构造的桩基础提供了一种经济的基础解决方案-案例历史

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A case history of design, prediction, probe pile driving, and construction of a pile foundation for Building 3 of Waterside at Bay Beach Condominiums located in Fort Myers Beach, southwest Florida, is presented. Site geometry constraints, the presence of a 12.0 ft (3.6 m) deep lake occupying the southern one-third portion of the proposed building footprint, and marginal subsoils provided specific challenges for design and construction of the foundation. The subsoil conditions were explored by performing Standard Penetration Test (SPT) borings and a Piezocone Penetration Test (PCPT) Sounding to depths of 100 ft (30.5 m) within the building footprint. Additionally, borings were performed to envelope the building. Deep foundation alternatives included driven concrete, monotube, and steel pipe pile as well as drilled shaft. Following an evaluation of high structural loads, site-specific constraints, foundation test data from buildings 1 and 2, and preference expressed by the project owner, a pre-cast prestressed concrete (PPC) pile-supported foundation system was selected as an economical and effective foundation approach. Use of an augered cast-in-place (ACIP) pile foundation system was precluded by the project structural engineer. This paper deals with the design aspects and methodologies utilized in choosing and economizing the foundation system. The building foundation was designed for an allowable pile capacity of 40 tons (353 kN) in compression, 1.5 tons (12 kN) in lateral capacity for a deflection of 0.25-in (0.64 cm) and 15 tons (133 kN) in uplift capacity. For the single story extended garage structure, a pile capacity of 27 tons (238 kN) was indicated in compression. As part of the design process, an extensive probe pile driving program was carried out in order to evaluate the pile driving equipment, determine and verify pile capacities, and optimize the production pile lengths. A total of 33, 14-in (356 mm) square, PPC concrete piles were driven within the entire building limits, and dynamically load tested utilizing Pile Driving Analyzer (PDA) as part of the probe pile driving program. Utilization of PDA during probe pile driving helped in predicting pile set-up (i.e., increase in pile resistance with time) as well as reducing the pile lengths by as much as 20 percent. It resulted in variable pile lengths during the production phase. This information was effectively utilized as part of the overall quality control program to install a total of 559 PPC piles (including 33 probe piles) within the Building 3 footprint, including the reclaimed lake area, to depths ranging from 45 to 58 ft (14 to 18 m) below existing ground elevation as part of the foundation support system. Prior to installation of probe or production piles, a termination criterion was established using 1-dimensional wave equation analyses in addition to the design pile embedment requirement. The predicted pile capacities compared reasonably well with the capacities from the CAPWAP analyses for probe piles. This engineered, monitored and tested foundation solution provided a cost effective and satisfactory basis for completion and approval of the foundation work for the building resulted in cost savings over other foundation alternatives for the owner. The building has since been occupied and a recent reconnaissance has indicated that the building foundations are performing satisfactorily.
机译：介绍了位于佛罗里达州西南部迈尔斯堡海滩的Bay Beach公寓的Waterside 3号楼的设计，预测，探测打桩和桩基础施工的案例。场地几何结构的限制，深达12.0英尺（3.6 m）的深湖的存在占拟建建筑占地面积的南部三分之一，以及边缘地下土层为基础的设计和施工带来了特殊挑战。通过在建筑物占地面积内进行100英尺（30.5 m）的深度执行标准渗透试验（SPT）钻孔和压电渗透试验（PCPT）探测来探索地下土壤条件。此外，还进行了钻孔以包围建筑物。较深的基础替代方案包括打入混凝土，单管和钢管桩以及钻杆。在评估了高结构荷载，特定地点的约束，建筑物1和2的地基测试数据以及项目所有者表示的偏爱之后，选择了预制的预应力混凝土（PPC）桩支撑地基系统，作为一种经济且可行的方法。有效的基础方法。项目结构工程师无法使用Augered现场浇铸（ACIP）桩基系统。本文讨论在选择和节约基础系统中使用的设计方面和方法。该建筑地基的设计允许承受的承压能力为40吨（353 kN），侧向能力为1.5吨（12 kN），挠度为0.25英寸（0.64 cm），举升能力为15吨（133 kN）。 。对于单层扩展车库结构，压缩显示的桩容量为27吨（238 kN）。作为设计过程的一部分，执行了广泛的探针打桩程序，以评估打桩设备，确定和验证打桩能力并优化生产打桩长度。在整个建筑范围内总共驱动了33个14英寸（356毫米）方形的PPC混凝土桩，并作为桩打桩程序的一部分，使用桩打桩分析仪（PDA）进行了动态载荷测试。在打桩过程中使用PDA有助于预测桩的建立（即随时间增加桩阻力），并将桩长减少多达20％。在生产阶段，这导致了可变的桩长。该信息被有效地用作整体质量控制计划的一部分，以在3号楼的占地面积（包括填海区）内安装总计559个PPC桩（包括33个探测桩），深度范围为45至58英尺（14至低于现有地面标高18 m）作为基础支撑系统的一部分。在安装探针或生产桩之前，除了设计桩的嵌入要求之外，还使用一维波动方程分析建立了终止标准。预测的桩容量与CAPWAP分析中的探桩容量比较合理。这种经过工程设计，监控和测试的基础解决方案为建筑物的基础工作的完成和批准提供了成本有效且令人满意的基础，从而为业主节省了成本。此后该建筑物已被占用，最近的勘察表明该建筑物的地基性能令人满意。

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