动刚度法在既有桥梁桩基础状态评估中的应用研究

发布时间：2019-03-27 07:30

【摘要】：由于正常运营的需要及各种条件的制约,新建桥梁基桩常用的检测方法(如静载试验法、高应变法、低应变法、超声波法及取芯法等)在既有桥梁中均难以实施,且其检测结果亦不足以全面评估基桩状况。本文提出的动刚度法,通过安装于桩顶位置的传感器采集激振力作用下桩土系统响应信号,分析绘制导纳随频率变化曲线,并由此推算基桩承载力;辅以取芯法、低应变法等检测手段进行验证,对某高速公路承载力不明确的部分既有基桩进行检测和理论分析,给出了这些基桩的实际承载力。检测结果表明,在正常运营的条件下,采用这一方法对在役基桩进行无损检测可以较好地评估基桩的承载能力,该方法对同类基桩的检测评定具有足够的精度。
[Abstract]:Due to the need of normal operation and the restriction of various conditions, the commonly used testing methods of new bridge foundation piles (such as static load test method, high strain method, low strain method, ultrasonic method and core method, etc.) are difficult to be implemented in existing bridges. Moreover, the testing results are not enough to evaluate the pile condition in an all-round way. The dynamic stiffness method presented in this paper collects the response signals of the pile-soil system under the excitation force by the sensor installed at the top of the pile, analyzes and draws the curve of the admittance varying with the frequency, and then calculates the bearing capacity of the foundation pile. The testing methods such as core-taking method and low-strain method are used to test and analyze the existing piles whose bearing capacity is not clear, and the actual bearing capacity of these piles is given. The test results show that under normal operating conditions, this method can be used to evaluate the bearing capacity of the piles in service, and this method has sufficient accuracy for the testing and evaluation of the same kind of foundation piles. 3. The test results show that the non-destructive testing method can be used to evaluate the bearing capacity of the foundation piles under normal operation conditions.
【作者单位】：神华铁路货车运输有限公司;中铁十五局集团公司;中国铁道科学研究院;
【分类号】：U443.15

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