Forward modeling on shallow bridge foundation defect detection by GPR
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摘要: 桥梁基础作为桥梁重要的组成部分,由于长期的地质作用和外部因素总是容易出现缺陷、裂缝等桥梁基础病害.考虑到传统的探地雷达探测方法-Common-offset法很难解决桥梁基础病害问题,提出采用特殊的Common-souree法来探测桥梁基础病害.利用GprMax软件,来模拟桥梁基础的探测过程;将正常桥梁基础和缺陷型桥梁基础的正演结果进行对比,可以发现二者存在明显的差异.利用这些差异可以在实际探测过程中识别出存在病害的桥梁基础,证明利用探地雷达探测桥梁基础病害是切实可行的办法.Abstract: Due to the long-term geological process and external factors,the bridge foundation as a key component of bridge always tends to get some diseases.Considering that the traditional common-offset method cannot detect bridge foundation defect very well,this paper proposes the use of a special common-source method to detect the bridge foundation defect.The forward modeling of the bridge foundation detection is realized by GprMax.The differences can be found easily by comparing the result of normal bridge foundation and that of defective bridge foundation.The result obtained by the authors is helpful to identifying the defective bridge foundation,which proves that GPR is an effective method for detecting the defect of bridge foundation.
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Key words:
- GPR /
- shallow bridge foundation defect /
- GprMax /
- forward modeling /
- defect detection
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