Use of fibre-optic sensors for simple assessment of ground surface displacements during tunnelling
Use of fibre-optic sensors for simple assessment of ground surface displacements during tunnelling
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DOI：
10.1680/geot.14.t.009
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发表时间：
2014-01-01
期刊：
影响因子：
5.8
通讯作者：
Wan, M. S. P.
中科院分区：
文献类型：
--
作者：
Hauswirth, D.;Puzrin, A. M.;Wan, M. S. P.
在伦敦中心的Crossrail隧道开挖过程中，通过嵌入浅的横向和纵向表面沟槽中的分布式光纤传感器，高精度地测量水平应变。这些测量与手动测微棒读数的验证证明了光纤传感的优点：在小应变下的高精度;显著更小的空间分辨率;以及在更大跨度上自动测量的可能性。为了进一步利用这些优势，对光纤测量的另外两个潜在应用进行了研究：（a）使用横向应变测量和沉降槽分析模型对垂直地面位移进行独立评估;以及（B）使用横向和纵向应变测量和沉降槽分析模型对垂直和水平地面位移进行早期预测。虽然理解单个案例研究只能形成有限结论的基础，但这两种应用似乎都是可行的。
Horizontal strains were measured with high precision during Crossrail tunnel excavation in central London by means of distributed fibre-optic sensors embedded in shallow transverse and longitudinal surface trenches. Validation of these measurements against manual micrometer stick readings demonstrates the benefits of the fibre-optic sensing: high precision at small strains; significantly smaller spatial resolution; and the possibility for automatised measurements over larger spans. In order to further capitalise on these advantages, two additional potential applications of the fibre-optic measurements were investigated: (a) independent assessment of the vertical ground displacements using transverse strain measurements and analytical settlement trough models; and (b) early prediction of the vertical and horizontal ground displacements, using transverse and longitudinal strain measurements and analytical settlement trough models. While understanding that a single case study can only form a basis for limited conclusions, both applications do appear to be feasible.