电磁波CT法岩溶路基注浆质量检测标准

为探讨岩溶路基注浆质量电磁波CT检测标准,对南广铁路岩溶路基试验区段的64个剖面进行了电磁波CT测试,对粘土层、卵石土层和溶洞等地下介质注浆前后电磁波吸收系数的差值进行了分析.结果表明,在注浆合格的岩溶路基中,粘土层注浆前后电磁波吸收系数的差值均小于0.1 dB/m,卵石土层约为0.20 dB/m,溶洞均大于0.4 dB/m,且主要分布在0.6~1.2 dB/m之间;南广铁路岩溶路基电磁波CT检测注浆合格标准为:卵石土层和溶洞注浆前后电磁波吸收系数差值分别大于0.2和0.4 dB/m. 

Electromagnetic Wave CT Detection Standard of Karst Roadbed Grouting

To investigate the detection standard of electromagnetic wave CT of karst roadbed grouting, 64 sections in the karst roadbed test areas of Nanning-Guangzhou railway were tested using the electromagnetic wave CT, the differences of electromagnetic wave absorption coefficients before and after grouting of clay, pebble soil and karst cave were analyzed. The results show that in grouting qualified karst roadbed, the difference of electromagnetic wave absorption coefficients before and after grouting is below 0.1 dB/m to clay and about 0.2 dB/m to pebble soil, respectively; and it is above 0.4 dB/m to karst caves, mainly from 0.6 to 1.2 dB/m. The electromagnetic wave CT detection standard of karst roadbed grouting for Nanning-Guangzhou railway is that the difference of absorption coefficients before and after grouting is above 0.2 dB/m to pebble soil and over 0.4 dB/m to karst caves.