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岩土体中渗流场的监测是岩土工程防灾减灾中一项必不可少的基础工作。在总结已有监测方法优缺点的基础上,提出了渗流场碳纤维加热光缆的分布式温度光纤感测技术(简称C-DTS);介绍了该方法的监测原理;提出了温度特征值(tT)的概念;设计了砂性土渗流模拟装置,并对砂性土中不同渗流速率下的渗流场进行了室内试验。通过试验确定了tT与渗流速率(V)之间存在线性关系;证明了碳纤维加热光缆能够有效地提高DTS监测的敏感性,可实现渗流速率的分布式监测。对该方法应用于工程实践还需要开展的研究工作进行了分析。
The seepage field in rock and soil monitoring is an indispensable basic work in geotechnical disaster prevention and mitigation. On the basis of summarizing the advantages and disadvantages of the existing monitoring methods, a distributed temperature optical fiber sensing technology (referred to as C-DTS) for carbon fiber heating cable in seepage field is proposed. The monitoring principle of this method is introduced. The temperature characteristic value (tT) The concept of sand soil seepage was designed, and the seepage field under different seepage velocities in sandy soil was tested in laboratory. The linear relationship between tT and seepage velocity (V) was confirmed through experiments. It was proved that carbon fiber heating cable can effectively improve the sensitivity of DTS monitoring and realize the distributed monitoring of seepage velocity. The research work that this method needs to be applied in engineering practice is also analyzed.