| 光纤和砂土界面耦合性能的分布式感测试验研究 |
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| 引用本文： | 程刚,施斌,朱鸿鹄,陈冬冬.光纤和砂土界面耦合性能的分布式感测试验研究[J].高校地质学报,2019,25(4):487. |
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| 作者姓名： | 程刚 施斌 朱鸿鹄 陈冬冬 |
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| 作者单位： | 华北科技学院(中国煤矿安全技术培训中心) 计算机学院,北京101601;南京大学地球科学与工程学院,南京210023;南京大学地球科学与工程学院,南京,210023 |
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| 基金项目： | 国家重点研发计划;国家自然科学基金;国家自然科学基金;河北省自然科学基金;中央高校基本科研业务费专项;工程技术研究中心项目 |
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| 摘 要： | 地质与岩土工程领域中，变形监测一直是评价岩土体稳定性的一个重要指标，其时空演化规律可为工程设计与施工
技术参数优化、地质灾害预警阈值设定提供科学的依据。随着光电感测技术的不断发展，其在地质与岩土工程变形监测中
的作用越来越重要，然而分布式感测光纤与岩土体之间的耦合性对监测结果有显著影响，阐明两者间的作用机理成为该技
术应用的关键环节。文章在综合分析当前地质与岩土工程变形监测技术的基础上，开展了基于BOTDA感测技术的光纤-砂
土界面耦合性能拉拔试验，从试验结果和感测光纤特性两方面分析了感测光纤与砂土的耦合性及二者间的应变传递规律。
试验结果表明：除第一级拉拔外，数据拟合R2均在0.99以上，显示了光纤实测应变分布具有良好的规律性；由试验数据反
算得出的光纤弹性模量约为0.35 GPa，与给定值基本一致；通过感测光纤的F-S端和F-S尾关系，得出光纤-土界面作用过程
可分为全耦合、半耦合和相对滑动三个阶段。上述研究结果为分布式感测技术在各类地质与岩土工程变形监测中的应用提
供指导，同时为开展各类室内模型试验提供参考依据。
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| 关 键 词： | 光纤—砂土界面 耦合性能 分布式感测 拉拔试验 |
Experimental Study on Coupling Performance of Fiber and Sand Interface Based on Distributed Sensing |
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| CHENGGang,SHI Bin,ZHU Honghu,CHENDongdong.Experimental Study on Coupling Performance of Fiber and Sand Interface Based on Distributed Sensing[J].Geological Journal of China Universities,2019,25(4):487. |
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| Authors: | CHENGGang SHI Bin ZHU Honghu CHENDongdong |
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| Abstract: | In the field of geology and geotechnical engineering, deformation monitoring has always been an important index to evaluate
stability. Its spatio-temporal evolution law can provide important reference for the optimization of design and construction parameters
of foundation engineering and the determination of early warning index of geological hazards. With the continuous development of
photoelectric sensing technology, its role in deformation monitoring of geological and geotechnical engineering is becoming more and
more important. However, the coupling performance between sensing optical fiber and rock-soil body has a significant impact on
monitoring results, and clarifying the mechanism between them has become a key part in the application of this technology. Based on
the comprehensive analysis of the current deformation monitoring technology of geology and geotechnical engineering, the pull-out test
of fiber-sand coupling performance based on distributed sensing technology was carried out. The coupling performance between
sensing fiber and sand, and the strain transfer law between them were analyzed from the test results and sensing fiber characteristics.
The experimental results show that except for the first stage pull-out, the R2 fitted by the data are all above 0.99, which shows that the
measured strain distribution of the optical fiber has better regularity; the elastic modulus of the optical fiber obtained by the back
calculation of the experimental data is about 0.35 GPa, which is basically consistent with the given value; by measuring the F-Shead and
F-Stail relationship of the optical fiber, it is concluded that the interaction process of the optical fiber-sand interface is mainly divided
into full-coupling, semi-coupling and relative sliding. The above research results provide guidance for the application of distributed
sensing technology in deformation monitoring of various geological and geotechnical engineering, and also provide important reference
for carrying out various model tests. |
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| Keywords: | optical fiber-sand interface coupling performance distributed sensing pull-out test |
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