Smart Foundations with Distributed Fibre Optics Technology

采用分布式光纤技术的智能基础

基本信息

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

项目摘要

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).

设计限制通常基于结构中的应变。尽管已建立了应变测量，但直到最近，当前的实践仍仅限于通过振动线（VWSG）或金属箔菌株量表的测量，以及最近利用光纤的光纤使用光纤bragg光栅（FBG）技术。如果结构与土壤相互作用（例如地下基础设施，例如基础，隧道或管道），或者在土壤结构（道路或大坝路堤）的情况下，则该结构状态尚不完全了解，除非已知完整的原位菌株状态。在监测堆积基础，隧道，管道，斜坡或路堤中的应变的背景下，捕获连续应变轮廓通常是无价的，可以确定局部问题区域，例如关节旋转，变形和不均匀分布的土壤结构相互作用载荷。在这个项目中，我们建议使用一种称为“布里渊光学时域反射计（BOTDR）”的独特光纤技术。这项新技术的新方面在于一个事实，即可以立即感觉到数十公里的纤维进行连续分布式应变测量，从而提供了相对便宜但高效的监测系统。该系统利用标准的低成本光纤（可能为0.1/m），并且应变分辨率可以降低到2个微菌株。我们将展示分布式应变测量值的重要性，以监视英国和美国现场地点建筑基础的性能。使用分布式应变数据，这是一种设计工具，可以与工业合作者一起开发需要康复，维修和重用的基础的性能。该项目提供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。