Smart Foundations with Distributed Fibre Optics Technology

采用分布式光纤技术的智能基础

• 批准号: EP/D040000/1
• 负责人: Kenichi Soga
• 金额: $ 35.84万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD040000%2F1
• 关键词: Smart; Foundations; Distributed; Fibre; Optics

Design limits are frequently based on strain developing in the structure. Although strain measurement is well established, current practice has until recently been restricted to measurement of point-wise strains by means of vibrating wire (VWSG) or metal foil strain gauges and more recently by fibre optics utilising Fibre Bragg Grating (FBG) technology. Where structures interact with soil, (e.g. underground infrastructure such as foundations, tunnels or pipelines) or indeed in the case of a soil structure (road or dam embankments), the state of the structure is not fully understood unless the complete in situ strain regime is known. In the context of monitoring strain in piled foundations, tunnels, pipelines, slopes or embankments, capturing the continuous strain profile is often invaluable to pinpoint localised problem areas such as joint rotations, deformations and non-uniformly distributed soil-structure interaction loads. In this project, we propose to use a unique fibre optics technology called the 'Brillouin optical time-domain reflectometer (BOTDR)'. The novel aspect of this new technology lies in the fact that tens of kilometres of fibre can be sensed at once for continuous distributed strain measurement, providing relatively cheap but highly effective monitoring systems. The system utilizes standard low cost fibre optics (potentially 0.1/m) and the strain resolution can go down to 2 micro strains. We will demonstrate the importance of distributed strain measurements to monitor the performance of building foundations at field sites in the UK and US. Using the distributed strain data, a design tool that optimises the performance of foundations that require rehabilitation, repair and reuse will be developed with industrial collaborators. The project has supports from UK Industrial partners as well US collaborators (National Science Foundation and Northwestern University).

设计极限通常基于结构中的应变发展。虽然应变测量已经很好地建立起来，但目前的实践直到最近还局限于通过振动丝（VWSG）或金属箔应变片测量点方向应变，以及最近通过光纤利用光纤布拉格光栅（FBG）技术。当结构与土壤相互作用时（例如地下基础设施，如地基、隧道或管道），或者在土壤结构（道路或堤坝堤防）的情况下，除非知道完整的原位应变状态，否则不能完全了解结构的状态。在监测桩基、隧道、管道、斜坡或路堤的应变时，捕获连续应变剖面对于精确定位局部问题区域（如联合旋转、变形和非均匀分布的土-结构相互作用载荷）通常是非常宝贵的。在这个项目中，我们建议使用一种独特的光纤技术，称为“布里渊光时域反射计（BOTDR）”。这项新技术的新颖之处在于，它可以一次检测几十公里长的纤维，进行连续的分布式应变测量，提供相对便宜但高效的监测系统。该系统采用标准的低成本光纤（可能为0.1/m），应变分辨率可降至2微应变。我们将展示分布式应变测量在英国和美国现场监测建筑基础性能的重要性。利用分布式应变数据，将与工业合作者开发一种设计工具，以优化需要修复、修复和重用的基础的性能。该项目得到了英国工业合作伙伴以及美国合作者（国家科学基金会和西北大学）的支持。

项目成果

Theoretical Study on Pile Length Optimization of Pile Groups and Piled Rafts

• DOI: 10.1061/(asce)gt.1943-5606.0000206
• 发表时间: 2010-02-01
• 期刊: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
• 影响因子: 3.9
• 作者: Leung, Y. F.;Klar, A.;Soga, K.
• 通讯作者: Soga, K.

Behaviour of an old masonry tunnel due to tunnelling-induced ground settlement

• DOI: 10.1680/geot.8.p.074
• 发表时间: 2010-12
• 期刊: Geotechnique
• 影响因子: 5.8
• 作者: H. Mohamad;Pj Bennett;K. Soga;R. Mair;K. Bowers

Energy pile test at Lambeth College, London: geotechnical and thermodynamic aspects of pile response to heat cycles

• DOI: 10.1680/geot.2009.59.3.237
• 发表时间: 2009-01-01
• 期刊: GEOTECHNIQUE
• 影响因子: 5.8
• 作者: Bourne-Webb, P. J.;Amatya, B.;Payne, P.
• 通讯作者: Payne, P.

Monitoring Twin Tunnel Interaction Using Distributed Optical Fiber Strain Measurements

• DOI: 10.1061/(asce)gt.1943-5606.0000656
• 发表时间: 2012-08-01
• 期刊: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
• 影响因子: 3.9
• 作者: Mohamad, Hisham;Soga, Kenichi;Lim, Chi Sharn
• 通讯作者: Lim, Chi Sharn