01477037

Component

The paper presents the application of 2-D time-domain waveform tomography to a highly variable site in Florida. The measured seismic surface wave fields were inverted using a full waveform inversion technique, based on a finite-difference solution with Gauss-Newton updating. Both the compression wave (P-wave) and shear wave (S-wave) velocities are inverted independently and simultaneously for possible indications of soil types. The waveform analysis was able to delineate: (1) a shallow low-velocity layer, (2) a variable high-velocity layer, (3) a low-velocity zone embedded at 9 to 14 m depth, and (4) highly variable bedrock, laterally and vertically, at the bottom of profile. The computed shear wave velocities with depth were found to be generally consistent with cone penetration test (CPT) tip resistance. The technology is very applicable to both shallow and deep foundation design where soil stratigraphy as well as variability (horizontal and vertical) is important. Moreover, the invasive soundings (e.g. CPT, SPT) could be used for assessing properties, and the seismic waveform tomography may then be used to assess layer boundaries and horizontal spatial correlation structure.

This paper was sponsored by TRB committee AFP30 Soil and Rock Properties.

01470560

13-1520

English

14p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; References

Elastic waves; Geological surveying; Geotechnical engineering; Stratigraphy; Tomography; Waveform analysis

Marion County (Florida)

Geotechnology; Highways; I40: Soils and Rocks

Transportation Research Board Annual Meeting 2013 Paper #13-1520

TRIS, TRB, ATRI

Feb 5 2013 12:23PM