基于BOTDA的PHC桩挠度分布式检测研究

发布时间：2018-04-23 13:14

本文选题：预应力高强混凝土(PHC)管桩 + 布里渊光时域分析技术(BOTDA)　；参考：《防灾减灾工程学报》2014年06期

【摘要】：针对预应力高强混凝土(PHC)管桩桩身在水平荷载作用下挠度大小和分布的检测困难,介绍了基于布里渊光时域分析技术(BOTDA)的桩身挠度检测方法;设计了管桩平推模型试验,推导出了管桩在水平荷载作用下的挠度计算公式;通过模拟和实测数据对比,分析了BOTDA用于PHC桩挠度检测的可行性与准确性,获得了PHC桩在水平荷载作用下的变形规律;结合具体工程,对该方法用于PHC桩身在水平荷载作用下挠度测量的可行性进行了验证。研究结果表明:BOTDA用于PHC桩挠度的检测与监测具有明显的优势,其分布式检测的特点,可以准确获得水平荷载对PHC桩的影响深度和挠度分布;该方法操作简便,性价比高,感测光纤耐久性好,可对桩身挠度分布进行精细化检测与监测,值得在桩基检测与监测中应用推广。
[Abstract]:In view of the difficulty of measuring deflection and distribution of prestressed high strength concrete (PHC) pipe pile body under horizontal load, this paper introduces the method of pile deflection detection based on Brillouin optical time domain analysis technique, and designs the model test of pipe pile. The deflection calculation formula of pipe pile under horizontal load is deduced, and the feasibility and accuracy of BOTDA used in deflection detection of PHC pile are analyzed by comparing the simulation data with the measured data, and the deformation law of PHC pile under horizontal load is obtained. The feasibility of using this method to measure the deflection of PHC pile under horizontal load is verified. The research results show that the measurement and monitoring of deflection of PHC pile with the weight of: BOTDA has obvious advantages, and the distribution of influence depth and deflection of horizontal load on PHC pile can be accurately obtained by the characteristics of distributed detection, and the method is simple to operate and has high performance to price ratio. The sensing fiber has good durability and can be used to detect and monitor the deflection distribution of pile body, which is worthy of application in pile foundation detection and monitoring.
【作者单位】：南京大学地球科学与工程学院;苏州南智传感科技有限公司;武汉中电岩土工程检测有限公司;
【基金】：国家重点基础研究发展计划(973计划)项目(2011CB710605) 国家科技支撑项目(2012BAK10B05)资助
【分类号】：TU473.16

【共引文献】