000019872 001__ 19872
000019872 005__ 20170118182340.0
000019872 04107 $$aeng
000019872 046__ $$k2017-01-09
000019872 100__ $$aStokoe, Kenneth
000019872 24500 $$aDeep Downhole Seismic Testing Using a Hydraulically-Operated, Controlled-Waveform Vibroseis

000019872 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019872 260__ $$b
000019872 506__ $$arestricted
000019872 520__ $$2eng$$aDownhole seismic testing is one field test that is commonly used to determine constrained compression-wave (P) and shearwave (S) velocity profiles in geotechnical earthquake engineering investigations. Traditional downhole testing has generally involved profiling in the 30- to 200-m depth range using hand-operated or small, mechanically-assisted sources. As the number of field investigations at locations with critical facilities has increased, profiling depths have also increased. An improved downhole test for P- and S-wave velocity profiling to depths exceeding 400 m is presented. The improvements include: (1) a more powerful source, (2) generation of simple sinusoidal waveforms, (3) the ability to “tune” the sinusoidal waveform to site conditions and (4) high-fidelity, post-processing of the time-domain records to increase signal-to-noise ratios at deeper depths. The seismic source is a large, hydraulically-operated, triaxial vibroseis named T-Rex that generates both P (vertically shaking) and S (horizontal shaking) waves. The test procedure and signal processing are discussed. Examples of raw and processed time-domain records, P- and S-wave travel-time plots, and interpreted wave velocity profiles measured to a depth of 415 m in one borehole are shown. Comparisons are also made with traditional downhole testing performed to a depth of 183 m in the same borehole.

000019872 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019872 653__ $$aField Seismic Testing, Downhole Test, Deep P- and S-Wave Profiling, Controlled Triaxial Source

000019872 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019872 720__ $$aStokoe, Kenneth$$iIi$$iHwang, Sungmoon$$iRoberts, Julia$$iMenq, Farn-Yuh$$iKeene, Andrew$$iLee, Richard$$iRedpath, Bruce
000019872 8560_ $$ffischerc@itam.cas.cz
000019872 8564_ $$s858988$$uhttps://invenio.itam.cas.cz/record/19872/files/4582.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4582.
000019872 962__ $$r16048
000019872 980__ $$aPAPER