1,720,974 research outputs found
Moderator's report on session 5: geophysical testing
No full textChapter summary:*Introduction*The Potential Benefits of Geophysics*Available Geophysical Techniques — Categories*Improving the Chances of Success*Contributions to this Conference*Topics for Discussion<br/
Class ‘A’ predictions of locations of major discontinuities at a storage cavern site, using seismic tomography
No full textIn situ determination of Ghh at Bothkennar using a novel seismic method
No full textThe paper describes a novel seismic method for determining the variation of velocity with depth of horizontally propagating, horizontally polarized shear waves (Sh,h). The technique exploits the curved paths of seismic waves in deposits with increasing velocity properties with depth. The new method has been applied at the soft clay test site at Bothkennar, and the results of this survey are compared with Sh,h and Sv,h wave velocity profiles obtained using conventional crosshole survey techniques at the site. The seismic data are further compared with the results of recently reported bender element tests on unconfined samples from the bedded and mottled Bothkennar clay. It is shown that, at the site investigated, the new method presents results comparable to those from the established field survey techniques. Neither the seismic nor the bender element data indicate significant stiffness anisotropy at the site. <br/
Comment on "Seismic tomographic imaging of a buried concrete target" by I. Bishop and P. Styles
No full textThe suitability of simple statistical techniques to remove the atmospheric effects from satellite multi-spectral remote sensing data from inland waters
No full textThe application of the covariance matrix atmospheric correction in the remote sensing of reservoirs
No full textAn evaluation of the role of monitoring during the construction of shallow NATM tunnels in urban areas
No full textMonitoring forms an essential part of the construction of New Austrian Tunnelling Method (NATM) tunnels. After the collapse of two platform tunnels and the concourse tunnel at the Central Terminal Area, Heathrow Airport, in October 1994, an extensive evaluation of NATM tunnelling, including the role of instrumentation, followed. The paper critically evaluates the purpose of monitoring during the construction of NATM tunnels, with specific reference to shallow tunnels in soft soils in urban areas. The instrumentation used during the construction of the station tunnels at Terminal 4 is evaluated with regard to its purpose and performance during construction. (As part of the Heathrow Express rail link between central London and Heathrow Airport, two underground stations are being constructed at Central Terminal Area and Terminal 4 respectively.
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