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| | Abstract | | In recent years, the railway facilities are being built in the permafrost region on the Tibetan Plateau. Because the Tibetan Plateau is known as one of the most advanced area of global warming, the maintenance of the railway and assessment of its influence to the permafrost requires investigation and monitoring of the changes of the roadbed and the permafrost soil. We have carried out a field experiment on the applicability of surface wave survey to permafrost investigation together with shear wave velocity investigation of railway embankment. For the experiment, a weight of about 10kg was used as the source and data were recorded with 12 receivers, 1m receiver spacing, 1ms sampling interval and 2048 data length. Then, the Vs structure of the ground was estimated through dispersion analysis and inversion. The result gives very clear boundary of the top and bottom of the permafrost layer, shows that the surface wave survey is effective for permafrost investigation in the plateau. |
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