地质雷达在公路隧道衬砌检测中的应用研究

摘要

为提高地质雷达检测隧道衬砌的精度,在分析实测过程的各个环节时,要尽量减少检测过程对结果的影响。以长坂坡隧道衬砌检测为研究对象,在不用测量轮的情况下,通过缩小内插桩号间距,减少人工移动天线速度不均造成的误差,提高检测数据在轴向的精度。通过计算已知厚度端的衬砌混凝土电磁波速度,采用其均值作为相应衬砌段的混凝土电磁波速度,反算出混凝土厚度,避免了直接采用介电常数计算造成的误差,并把误差控制在厘米级,提高了检测精度。%In order to improve the detection accuracy of geological radar in tunnel lining,the results shall not be affected by detection when analyzing all aspects of measurement.Taking Changbanpo Tunnel lining as the object,in case of no meter wheel,the space between internal pitching piles can be narrowed to reduce the error due to uneven speed of artificial mobile antenna and thus to improve the accuracy of detection data in axial direction.Through calculation of the velocity of electromagnetic wave of lining concrete in the end with thickness already known,the equalizing value is used as the velocity of concrete wave in the corresponding lining section and then concrete thickness can be inversed,which avoids calculation errors caused by directly using dielectric constant and controls error within centimeter to improve detection accuracy.