地质雷达在预应力梁钢绞线孔道注浆质量中的研究

Research of Duct Grouting Quality in the Ground Penetrating Radar of Bridge Prestressed Steel Strand

预应力梁钢绞线孔道注浆饱满程度直接关系到桥梁的安全和使用寿命,对其施工工艺的控制和注浆效果的检测越来越受关注。运用时域有限差分法(FDTD),采用广义完全匹配层(GPML)作为吸收边界,对常见注浆孔道缺陷进行二维正演,结合工程开窗验证,总结缺陷的雷达图像特征和规律,为地质雷达法检测注浆饱满度提供依据。

The duct grouting fullness degree of bridge prestressed steel strand are directly related to the safety and use- life of the bridge and the construction technology control and grouting effect testing arise more and more concern. The finite difference time domain method （FDTD） are applied and the generalized completely matched layer （GPML） are adoped as absorbing boundary, two-dismension forword modelling is demonstrated on the common grouting dect defect. Combined with engineering window verification, the characteristics and rules of duct grouting defects of radar image is summarized. The method provides duct grouting fullness degree of ground penetrating radar with evidence.