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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。
Aiming at the anomalous defects existing behind the backfill grouting lining of diversion tunnels, taking six diversion tunnels of a hydropower station in Sichuan Province as an example, six abnormal morphologies were selected to conduct the test research of the geological radar. The test results show that GPR can effectively reflect the cavities in the lining after lining grouting, the cavity behind the lining, the backfill is not dense, the lining is not solidified with the surrounding rock cementation, etc. The accuracy of the defect depth detection is relative to the lining The relative permittivity, under the condition of accurately determining the relative permittivity of the lining, the defect depth can be quantitatively analyzed, the error is not more than 12%, and it is preferable to determine the average value of a plurality of calibration points for the relative permittivity of the lining; The three-dimensional visualization of survey lines can effectively improve the intuition of interpretation. Geological radar test results with borehole video were verified.