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为了进一步提高灌注桩基检测水平,介绍基于分布式光纤传感技术的监测原理并设计相关的试验模型,制作含泥量分别为0,33.3%,50%,66.7%,100%的5种夹泥桩,对不同夹泥桩的光纤温升进行测量,分析不同夹泥桩中光纤温升规律,研究加热功率大小对光纤温升的影响及含泥量对光纤温升的影响。分析结果表明:温升与加热功率具有良好的线性关系;光纤温升随含泥量增加而增加,呈现先缓后快的增加规律;光纤温升与其所处桩身介质的结构和导热系数密切相关;该模型试验验证了分布式光纤传感技术用于夹泥灌注桩完整性检测的可行性,也可为基于该技术桩基检测的理论完善提供参考。
In order to further improve the detection level of perfusion pile foundation, the principle of monitoring based on distributed optical fiber sensing technology and the related experimental models are introduced. Five kinds of clamps with 0,33.3%, 50%, 66.7% and 100% The effect of heating power on the temperature rise of optical fiber and the influence of clay content on the temperature rise of the optical fiber were studied by measuring the optical fiber temperature rise of different clip piles. The results show that there is a good linear relationship between temperature rise and heating power. The temperature rise of optical fiber increases with the increase of clay content, which shows the increasing trend of slowing down first. The temperature rise of optical fiber is closely related to the structure and thermal conductivity of the pile body The model test verifies the feasibility of distributed optical fiber sensing technology for the integrity testing of mud-filled piles. It also provides a reference for the theoretical improvement of pile-based testing of this technology.