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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 >DEEP FOUNDATIONS IN THE CHALLENGING GEOLOGY OF CENTRAL FLORIDA
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DEEP FOUNDATIONS IN THE CHALLENGING GEOLOGY OF CENTRAL FLORIDA

机译：挑战中佛罗里达州的深层基础

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摘要

Central Florida is among the fastest growing urban areas in the United States, and its rapid development has required the steady construction of various types of civil engineering works. The karst geologic terrain and variable geotechnical conditions, however, present special challenges to the design and construction of deep foundations. The subsurface profile can be idealized as a surficial layer of Pleistocene sands, underlain by the highly variable Miocene-age Hawthorn Group, consisting of various combinations of sand, silt, clay, phosphate and highly weathered limestone. The Hawthorn Group is underlain by Eocene-age limestone that comprises the Floridan aquifer. Vast networks of solution cavities are present throughout the Eocene limestone, sometimes allowing downward raveling of the overlying soils and the creation of sinkholes. In some cases, the relic sinkholes can be filled with soft compressible organic soils extending to depths greater than 100 feet (30.5 m). Driven piles are frequently employed as a deep foundation alternative, although occasionally cast-in-place piles/shafts have also been used. Piles are often driven for bearing in the weathered limestone within the Hawthorn Group, but are sometimes installed as friction piles in the upper soil and intermediate geomaterials. Dynamic pile testing is routinely performed during pre-construction test pile programs, or during production for quality control and assurance purposes. This paper presents discussions on the design and construction aspects of deep foundations unique to Central Florida subsurface conditions and local practice. Foundation issues such as subsurface variability, soil setup, pile damage, negative skin friction, and sinkhole conditions are discussed with the aid of demonstrative case histories.
机译：佛罗里达州中部是美国发展最快的城市之一，其快速发展要求稳定建设各种类型的土木工程。然而，喀斯特地质地形和变化的岩土条件对深层基础的设计和施工提出了特殊的挑战。地下剖面可以理想化为更新世砂岩的表层，并由高度变化的中新世时代的山楂树群（由砂，粉砂，粘土，磷酸盐和高度风化的石灰石组成）组成。霍桑群位于始新世时代的石灰岩之下，该石灰岩包括佛罗里达含水层。整个始新世石灰岩中都存在着大量的溶蚀空洞网络，有时可以使上覆的土壤向下流散，并形成下沉孔。在某些情况下，文物下沉孔可以充满可压缩的软性有机土壤，延伸至大于100英尺（30.5 m）的深度。尽管有时也使用现浇桩/竖井，但通常采用打入桩作为深层基础。经常将桩打入山楂组内风化的石灰岩中，但有时以摩擦桩的形式安装在上层土壤和中间土工材料中。在施工前的测试桩计划中或生产过程中，通常会进行动态桩测试，以进行质量控制和保证。本文介绍了佛罗里达中部地区地下条件和当地实践特有的深层基础的设计和施工方面的讨论。借助示范案例，讨论了地表问题，例如地下变化性，土壤设置，桩损坏，负面的皮肤摩擦和下沉情况。

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