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为了探讨预应力梁板中塑料波纹管注浆饱满度,本文以探地雷达理论为基础,运用时域有限差分法,建立塑料波纹管中空洞在不同位置模型,进行探地雷达二维正演模拟,模拟结果表明运用2.6G天线可以检测到钢绞线底部和上部的空洞;将该型号天线应用于某大桥预应力梁板检测中,对典型雷达图像进行打钻验证,与检测结果相符.综合模拟和现场探测结果表明,探地雷达法使用2.6G天线检测预应力梁板中塑料波纹管注浆饱满度是可行的.
In order to investigate the fullness of plastic bellows grouting in prestressed beams, based on GPR theory and using finite difference time domain method, a model of hollow cavity of plastic bellows was established in different positions to conduct two-dimensional forward modeling of GPR. The simulation results show that the 2.6G antenna can detect the cavity at the bottom and the top of the strand, and the model antenna is used in the testing of prestressed beams in a certain bridge, and the typical radar image is verified by drilling test, which is consistent with the test results. And the field detection results show that the use of ground penetrating radar method 2.6G antenna prestressed beam corrugated plastic pipe fullness is feasible.