CAJ | 학술논문

根据南水北调东线穿黄南干渠实验段保温板垫层和砂砾垫层混凝土衬砌施工质量探地雷达(GPR)检测结果及室内模拟实验结果,总结了GPR检测图像典型异常特征,确定了渠道衬砌裂缝、混凝土厚度不均、垫层破坏等缺陷对应的异常图谱.并采用正演模拟计算方式分析了GPR方法对裂缝延展深度、混凝土厚度变化、垫层缺陷程度的反映能力.研究表明隐伏裂缝、超过1 cm的混凝土厚度变化、垫层破坏程度都可在GPR剖面上得到有效反映.
근거남수북조동선천황남간거실험단보온판점층화사력점층혼응토츤체시공질량탐지뢰체(GPR)검측결과급실내모의실험결과,총결료GPR검측도상전형이상특정,학정료거도츤체렬봉、혼응토후도불균、점층파배등결함대응적이상도보.병채용정연모의계산방식분석료GPR방법대렬봉연전심도、혼응토후도변화、점층결함정도적반영능력.연구표명은복렬봉、초과1 cm적혼응토후도변화、점층파배정도도가재GPR부면상득도유효반영.
QDB cushion and gravel cushion concrete lining were two types of lining built in experimental section of South Main Channel crossing Yellow Rive in South-to-North Water Diversion East Line Project. The defects in those channel lining were detected with GPR method and the representative abnormal characteristics of measured GPR image have been pointed. Meanwhile, defects simulation and testing experiment were also carried out in laboratory. Those testing results confirmed the abnormal GPR image characteristic of different lining defects including crack, thickness variation and cushion breakage. Moreover, detecting capability of GPR was also analyzed in this paper with forward calculation method. The forward calculation results showed hidden crack, over one centimeter variation of thickness and break degree of cushion could been figured out in GPR image.