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Load-Independent Characterization of Plate Foundation Support Using High-Resolution Distributed Fiber-Optic Sensing

机译：使用高分辨率分布式光纤传感的板基础支座独立于载荷的表征

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摘要

The evaluation of soil reaction in geotechnical foundation systems such as concrete pavements, mat- and raft foundations is a challenging task, as the process involves both the selection of a representative mechanical model (e.g., Winkler, Continuum, Pasternak, etc.) and identify its prevailing parameters. Moreover, the support characteristics may change with time and environmental situation. This paper presents a new method for the characterization of plate foundation support using high-resolution fiber-optic distributed strain sensing. The approach involves tracking the location of distinct points of zero and maximum strains, and relating the shift in their location to the changes in soil reaction. The approach may allow the determination of the most suited mechanical model of soil representation as well as model parameters. Routine monitoring using this approach may help to asses the degradation of the subsoil with time as part of structural health monitoring strategies. In this paper, fundamental expressions that relate between the location of distinct strain points and the variation of soil parameters were developed based on various analytical foundation support models. Finally, as an initial validation step and to underpin the idea basics, the proposed method was successfully demonstrated on a simple mechanical setup. It is shown that the approach allows for load-independent characterization of the soil response and, in that sense, it is superior to common identification methods.
机译：在土工基础系统（例如混凝土路面，垫层和筏板基础）中评估土壤反应是一项艰巨的任务，因为该过程涉及选择代表性的机械模型（例如Winkler，Continuum，Pasternak等）并进行识别。其主要参数。此外，支撑特性可能会随时间和环境状况而变化。本文提出了一种使用高分辨率光纤分布式应变传感表征板基础支撑的新方法。该方法涉及跟踪零应变和最大应变的不同点的位置，并将其位置的变化与土壤反应的变化相关联。该方法可以允许确定最合适的土壤表示的机械模型以及模型参数。作为这种结构健康监测策略的一部分，使用这种方法进行的常规监测可能有助于评估随时间推移的地下土壤退化情况。本文基于各种分析基础支持模型，建立了不同应变点位置与土壤参数变化之间的基本关系式。最后，作为最初的验证步骤并巩固思想基础，该提议的方法已在简单的机械装置上成功地进行了演示。结果表明，该方法可以对土壤响应进行独立于载荷的表征，从这个意义上讲，它优于常见的识别方法。

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