中文摘要：

针对引水隧洞回填灌浆衬砌背后存在的异常缺陷,以四川某水电站引水隧洞为例,选取了6组异常形态,进行地质雷达检测试验研究。测试结果表明：地质雷达法能够有效地反映回填灌浆后衬砌内的空腔、衬砌背后的空腔、回填不密实、衬砌同围岩胶结不密实等异常情况;缺陷体深度检测精度与衬砌相对介电常数有关,在准确测定衬砌相对介电常数的条件下,能够定量分析缺陷体深度,误差不超过12%,确定衬砌相对介电常数宜取多个标定点的平均值;对多条雷达剖面测线进行三维可视化处理后能有效地提高解释的直观性。将地质雷达测试结果同钻孔录像进行了验证分析。

英文摘要：

Aiming at the defects behind the lining of diversion tunnel after backfill grouting,taking the diversion tunnel of a hydropower station in Sichuan for example,6 groups of abnormal morphology are selected,and the GPR detection is studied. The test result shows that（ 1） geological radar method can effectively reflect the cavity inside and behind the lining after backfill grouting,uncompacted backfill,and lining that less dense cemented with rock;（ 2） the measurement accuracy of the defect depth relates to the relative dielectric constant of the lining,the defect depth can be quantitatively analyzed under the condition that the relative dielectric constant of layer is accurately determined,and the error does not exceed 12%,the relative dielectric constant should take the average number of various gauge points;（ 3） the three-dimensional visualization of treatment can effectively improve the intuitive interpretation of multiple radar profile measuring lines. The video monitoring result is built to verify the GPR detection result.