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Application of Dynamic Stiffness Method in Evaluating Status of Existing Bridge Pile Foundation

机译：动态刚度法在现有桥梁桩基础评价中的应用

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摘要

Currently there is a growing demand for quality inspection of existing bridge pile foundation. Due to requirements of normal operation and various restricted conditions, those common testing methods used for new bridge foundation piles (i.e. static load testing, high-strain gauge method, low-strain gauge method, ultrasonic method and core-drilling method, etc.) are difficult to be implemented and also the testing results are not sufficient enough to comprehensively evaluate the status of foundation piles. The mechanical impedance method with transient excited force (also called dynamic stiffness method) is proposed to collect the pile-soil response signal under the action of excited force via a sensor mounted on top of the piles and the curve between admittance and frequency is drawn to derive the capacity resistance of foundation piles. A large quantity of theoretical research and practice has shown that such a method could provide acceptable engineering accuracy for foundation pile evaluation. Existing foundation pile in a highway section is tested with the dynamic stiffness method and the results are verified with core-drilling and low-strain gauge methods. It has shown that in normal operation, the dynamic stiffness method could perform nondestructive testing for foundation pile in use so as to evaluate the capacity resistance and reference could be made for testing and evaluation of similar pile foundation.
机译：目前，对现有桥梁桩基质量检验日益增长的需求。由于正常运行的要求和各种限制条件，这些常用测试方法用于新桥梁基础桩（即静电载荷测试，高菌株测量法，低应变计法，超声波法和核心钻孔方法等）难以实现，并且测试结果也不足以全面评估基础桩的地位。提出了具有瞬态激发力（也称为动态刚度法）的机械阻抗方法，以通过安装在桩顶部的传感器和频率之间的曲线来收集激发力的动作下的桩土响应信号。得出基础桩的容量阻力。大量的理论研究和实践表明，这种方法可以为基础桩评估提供可接受的工程准确性。通过动态刚度法测试高速公路段中的现有基础桩，并用芯钻和低应变计方法验证结果。它表明，在正常运行中，动态刚度方法可以对使用的基础桩进行无损检测，以评估电容阻力和参考，可以对类似桩基进行测试和评估。

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