分布式光纤在混凝土筏板基础中的应变监测研究

胡闵; 陈宏波

doi:10.20265/j.cnki.issn.1007-2993.2025-0181

分布式光纤在混凝土筏板基础中的应变监测研究

doi: 10.20265/j.cnki.issn.1007-2993.2025-0181

胡闵^1,,
陈宏波^2, ,

1.
昆山旺湖置业有限公司，江苏苏州　215324
2.
中国矿业大学（北京）力学与土木工程学院，北京　100083

详细信息

作者简介:
胡　闵，男，1980年生，大学本科，主要从事结构健康监测方面的工作。E-mail：3578731@qq.com

通讯作者:
陈宏波，男，2000年生，硕士研究生，研究方向为混凝土结构健康监测。E-mail：chenhb1229@163.com

中图分类号: TU476
计量
- 文章访问数: 31
- HTML全文浏览量: 10
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2025-04-17
- 修回日期: 2025-09-15
- 录用日期: 2025-09-15
- 刊出日期: 2026-08-08

Strain monitoring of distributed optical fiber in concrete raft

HU Min^1
,,
CHEN Hongbo^{2
, ,}

1.
Kunshan Wanghu Real Estate Co., Ltd., Suzhou 215324, Jiangsu, China
2.
College of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

摘要

摘要: 为实现对混凝土筏板结构的应变监测，以昆山某住宅项目中的混凝土筏板基础为工程背景，设计并构建了一套基于分布式光纤技术的应变监测系统，开展了室内试验与现场监测研究。室内试验研究表明，5 mm钢绞线光纤应变传递效率达到了0.9968，验证了该类型光纤应用于实际工程监测的可靠性。基于室内试验结果，将5 mm钢绞线光纤布设在混凝土筏板结构中，精准记录了筏板基础内部的应变演化，监测结果显示：在混凝土浇筑完成后，温度上升阶段应变变化剧烈，最大值达75 μɛ；降温阶段因温度梯度导致应变进一步增大，峰值约为125 μɛ；随着温度趋于稳定，应变增长逐渐平缓并在大部分区域开始减小。该应用研究成果为分布式光纤传感技术监测混凝土筏板基础的健康提供了技术支撑。
- 筏板基础 /
- 分布式光纤 /
- 应变监测
Abstract: To realize strain monitoring of concrete raft foundation structures, a strain monitoring system based on distributed optical fiber sensing technology was designed and constructed with the concrete raft foundation of a residential project in Kunshan as the engineering background. Laboratory tests and on site monitoring investigations were carried out. Laboratory test results show that the strain transfer efficiency of 5 mm steel strand cased optical fiber reaches 0.9968, which verifies the reliability of this type of optical fiber in practical engineering. Based on the laboratory test results, 5 mm steel strand cased optical fibers were embedded in the concrete raft foundation, which can accurately record the internal strain evolution law of the raft foundation. After concrete pouring, the strain changes drastically during the temperature rising stage with a maximum value of 75 μɛ. The strain further increases during the cooling stage due to temperature gradient, with a peak value of approximately 125 μɛ. As the temperature tends to stabilize, strain growth gradually slows down and begins to decrease in most regions. The research achievements provide engineering application techniques for monitoring the health condition of concrete raft foundations using distributed optical fiber sensing technology.
- raft foundation /
- distributed optical fiber /
- strain monitoring

HTML全文

图 1 BOTDR光纤解调仪

Figure 1. BOTDR fiber optic demodulator

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图 2 5 mm钢绞线光纤结构示意图

Figure 2. 5 mm steel strand optical fiber structure diagram

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图 3 试验过程图

Figure 3. Test process diagram

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图 4 拉伸装置

Figure 4. Stretching device

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图 5 裸纤与5 mm钢绞线光纤的应变曲线图

Figure 5. Strain curves of bare fiber and 5 mm steel strand fiber

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图 6 光纤布设示意图

Figure 6. Optical fiber layout schematic diagram

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图 7 现场监测系统的建立

Figure 7. Establishment of on-site monitoring system

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图 8 混凝土筏板基础整体应变变化

Figure 8. The overall strain change of concrete raft foundation

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图 9 混凝土筏板基础温度上升期间应变

Figure 9. Strain of concrete raft foundation during temperature rise

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图 10 混凝土筏板基础温度下降期间应变

Figure 10. Strain of concrete raft foundation during temperature drop

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图 11 混凝土筏板基础温度稳定后应变

Figure 11. Strain of concrete raft foundation after temperature stabilization

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