Design of a novel drilled-and-grouted pile in sand for offshore oil&gas structures |
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Affiliation: | 1. State Key Laboratory of Ocean Engineering and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Department of Civil Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Minhang District, Shanghai 200240, China;2. School of Highway, Chang''an University, China;1. Department of Vascular Medicine, University Hospital Grenoble‐Alpes, Grenoble, France;2. CNRS/TIMC‐IMAG UMR 5525/Themas, Grenoble‐Alpes University, Grenoble, France;3. Department of Emergency, University Hospital Grenoble‐Alpes, Grenoble, France;4. Hemostasis Unit, University Hospital Grenoble‐Alpes, Grenoble, France |
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Abstract: | New offshore oil and gas exploration has placed renewed emphasis on developing structures in relatively complex geological conditions. Due to the damaging nature of impact driving, traditional steel piles used to support jacket structures, are not ideally suited to specific soil types, such as carbonate sands. Drilled and grouted piles are commonly used to support structures in these soil conditions. This paper describes a novel drilled pile, which has been developed specifically to provide a cost effective installation process while maintaining the benefits of grouted piles. The installation process negates the need for temporary casing in weak soils and minimizes the number of offshore operations. In this paper, the installation methodology and post-installation performance of a large scale onshore field trial is described. The installation process was successfully demonstrated with a 1.9 m diameter test pile installed in fine sand to 17.7 m depth in under 3 h. The performance of the pile, as measured in a tension static load test, was shown to compare favorably with existing pile design methods. |
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Keywords: | Offshore Oil&gas Drilled piles Grouting |
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