The Effect of Posterior Distribution Sampling Schemes on Probabilistic Dynamic CPTu Rate-Effect Corrections
Publication: Geo-Risk 2023
ABSTRACT
In situ dynamic cone penetration tests (CPTu) are performed to efficiently characterize near-surface marine sediments. Dynamic data require a strain-rate correction according to strain-rate model and law due to the nonlinear penetration rate of the cone probe insertion. This requires paired (i.e., closely located in space and time) quasi-static and dynamic CPTu measurements, increasing cost and reducing time efficiency of the dynamic tests. Two Bayesian methodologies for dynamic cone tip resistance correction are exploited, which make use of limited unpaired quasi-static CPTu observations acquired proximal to dynamic test’s location. Unpaired dynamic cone tip resistance profiles are fitted to discrete cosine transform functions within two different Markov chain Monte Carlo simulation processes: a transient (TMCMC) and not transient one (MCMC). Results show the effectiveness of the transient Markov chain scheme over the not transient one to predict strain-rate coefficients in agreement with those obtained from the conversion of dynamic and paired quasi-static CPTu.
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Published In
Geo-Risk 2023
Pages: 123 - 132
History
Published online: Jul 20, 2023
ASCE Technical Topics:
- Continuum mechanics
- Dynamic tests
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Field tests
- Geotechnical engineering
- Geotechnical investigation
- Laboratory tests
- Markov process
- Material mechanics
- Materials engineering
- Mathematics
- Penetration tests
- Probability
- Solid mechanics
- Statics (mechanics)
- Stochastic processes
- Strain
- Strain rates
- Tests (by type)
- Transient response
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