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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。
Aiming at the difficulty of detection of the deflection and distribution of the prestressed high strength concrete (PHC) pipe pile body under horizontal load, a method of pile deflection detection based on Brillouin Optical Time Domain Analysis (BOTDA) is introduced. The formula of deflection of pipe pile under horizontal load is deduced. The comparison of simulation and measured data shows that the feasibility and accuracy of BOTDA for deflection detection of PHC pile are analyzed. The deformation law of the PHC pile under the action of horizontal load is verified. The feasibility of the method for the deflection measurement of the PHC pile under the horizontal load is verified with the specific engineering. The results show that BOTDA has obvious advantages for the detection and monitoring of the deflection of PHC pile. The characteristics of distributed detection can accurately obtain the depth and deflection distribution of the horizontal load on the PHC pile. The method is simple, cost-effective, Measuring fiber durability, can be distributed on the pile deflection testing and monitoring of fine, it is worth in the pile foundation testing and monitoring applications promotion.