Improving the design of piles driven in chalk through the ALPACA research project

Improving the design of piles driven in chalk through the ALPACA research project
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通过羊驼研究项目改进粉笔打桩的设计

DOI:
10.1051/geotech/2019008
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发表时间:
2019
期刊:
Revue Française de Géotechnique
影响因子:
--
通讯作者:
Jardine R
Jardine R
中科院分区:
--
文献类型:
--
作者:
Jardine R

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白垩作为一种低密度、多孔、弱的碳酸盐岩存在于欧洲西北部的大面积地区。大量的海上风力涡轮机、桥梁和港口设施都依赖于用粉笔打成的桩。目前欧洲的实践假设,与Chalk的无侧限抗压强度和CPT锥体阻力范围相比,最终轴阻力似乎较低,并且可能对项目经济产生非常显著的影响。关于桩的可打入性、桩的立桩或白垩土中的横向阻力,或白垩土中打入的桩如何承受轴向或横向循环荷载,几乎没有指导。本文介绍了由EPSRC和工业资助的ALPACA(应用多尺度现场和实验室测试的粉笔轴向-横向桩分析)项目,该项目正在通过在一个具有良好特征的低至中等密度试验场进行全面的现场测试,并得到其他测试分析的支持,开发新的设计指南。现场试验的36打入桩,其中16采用高分辨率光纤应变计,是支持先进的实验室和原位测试,以及理论分析。实地工作于二零一七年十月展开,并于二零一九年五月大致完成。
Chalk is present under large areas of NW Europe as a low-density, porous, weak carbonate rock. Large numbers of offshore wind turbines, bridges and port facilities rely on piles driven in chalk. Current European practice assumes ultimate shaft resistances that appear low in comparison with the Chalk’s unconfined compression strength and CPT cone resistance ranges and can impact very significantly on project economics. Little guidance is available on pile driveability, set-up or lateral resistance in chalk, or on how piles driven in chalk can sustain axial or lateral cyclic loading. This paper describes the ALPACA (Axial-Lateral Pile Analysis for Chalk Applying multi-scale field and laboratory testing) project funded by EPSRC and Industry that is developing new design guidance through comprehensive field testing at a well-characterised low-to-medium density test site, supported by analysis of other tests. Field experiments on 36 driven piles, sixteen of which employ high resolution fibre-optic strain gauges, is supported by advanced laboratory andin situtesting, as well as theoretical analysis. The field work commenced in October 2017 and was largely complete in May 2019.
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