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Volume 26 Issue 3
Jun.  2013
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Journal of Southwest Jiaotong University  > 2013  >  26(3): 441-447,454.
HU Yi, XIE Qiang, ZHAO Wen, ZHENG Lining. Electromagnetic Wave CT Detection Standard of Karst Roadbed Grouting[J]. Journal of Southwest Jiaotong University, 2013, 26(3): 441-447,454. doi: 10.3969/j.issn.0258-2724.2013.03.008
Citation: HU Yi, XIE Qiang, ZHAO Wen, ZHENG Lining. Electromagnetic Wave CT Detection Standard of Karst Roadbed Grouting[J]. Journal of Southwest Jiaotong University, 2013, 26(3): 441-447,454. doi: 10.3969/j.issn.0258-2724.2013.03.008
shu

Electromagnetic Wave CT Detection Standard of Karst Roadbed Grouting

doi: 10.3969/j.issn.0258-2724.2013.03.008
  • Received Date: 11 Oct 2012
  • Publish Date: 25 Jun 2013
    Abstract
  • 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.

     

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