A Seismic Cone Penetrometer for Offshore Applications

Campanella, Richard; Robertson, P. K.; Gillespie, D.

doi:10.1007/978-94-009-4205-9_51

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…The modern version of the seismic cone was developed at the University of British Columbia (UBC) and its use offshore was reported by Campanella et al (1986). Figure 24 shows a typical set up for seabed testing as described by Peuchen et al (2002).…”

Section: Other Sensors Included In Cone Penetrometersmentioning

confidence: 99%

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Lunne

2012

Geomechanics and Geoengineering

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For the last 40 years, the CPT has played a key role in offshore soil investigations, mainly in connection with oil and gas development, but also for other purposes. The offshore application of CPT has been an important factor with regards to development of equipment, data processing and interpretation. Each of the following aspects are discussed in terms of historic development, present status and future challenges:-Deployment method and equipment.-Penetrometer design and construction.-Data acquisition, processing and quality control.-Standards and guidelines.-Interpretation of results and application in foundation design. It is shown that these developments have greatly enhanced the reliability and applicability of the use of the CPT in soil investigations and design. However, there are still important challenges to be faced in the future

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Section: Other Sensors Included In Cone Penetrometersmentioning

confidence: 99%

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Lunne

2012

Geomechanics and Geoengineering

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“…Detailed reviews of the laboratory and field methods for measurement of G max are previously given by Woods (1994) and Campanella (1994), respectively (Campanella et al 1986). …”

Section: Methodsmentioning

confidence: 99%

Seismic piezocone interpretation for shear wave velocity (V S) determination in the Persian Gulf

2010

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Shear wave velocity is one of the important factors representing the dynamic characteristics of soil layers. Hence, many researchers have focused their studies on determining shear wave velocity by direct field measurements or expressions developed by other soil parameters. The shear module and damping ratio of the soil layers also play a similar role in the majority of dynamic soil response analyses. Nevertheless, since they have to be measured in the laboratory by resonant column or cyclic triaxial tests on undisturbed samples, the possibility of preparing such samples and the reliability of the obtained results are of great concerns. In the present study, great effort has been made to determine the above dynamic factors by means of field data obtained from a versatile instrument, namely the seismic piezocone (SPCT U ), and to derive expressions correlating them with some parameters obtainable by much simpler instruments. The reliability of laboratory measurements on undisturbed samples is also evaluated. The seismic piezocone test apparatus has been employed to evaluate the soil properties at 1-m depth intervals by means of measuring tip resistance, sleeve resistance, pore pressure and shear wave velocity. The shear module and the damping ratio are calculated using field data. Meanwhile, in order to assess the laboratory measurements of these parameters, some resonant column tests and cyclic triaxial tests on undisturbed samples of the same soil layers have been carried out. In order to compare the field results of shear modulus and damping ratios with those obtained from laboratory tests, the influences of the soil nature and sample disturbance on the conventional laboratory methods are evaluated and discussed. The shear wave velocity is correlated to overburden pressure and the corrected tip resistance for two groups of fine soils, namely silty clays and carbonate clayey silts, which mainly cover the areas under study in this project, are located in southern parts of Iran near the Persian Gulf. According to the results of the present study, there are narrow limits of shear modulus regarding soils for which the laboratory tests and the field measurements yield approximately the same shear modulus. This limit of shear modulus is about 30-50(MPa) for clay deposits and 70-100 (MPa) for sandy deposits. Also the shear wave velocity can be calculated by a simple expression from total overburden pressure and the tip resistance of simple cone penetration test results conventionally available in many soil explorations prior to engineering practices. However, if the pore pressure inside the saturated soil deposits can be measured by a piezocone apparatus, the shear wave velocity may be calculated using another suggested equation in terms of effective overburden pressure in the present study. Regarding the shear module and the damping ratio, due to the disturbances of the stiff deposits in the sampling process and great deviations of laboratory results from field results, the laboratory measurements of these parameters ...

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“…The focus of this paper is on SCPTs; however, the same methodology can also be applied to Downhole Seismic Testing data. The SCPT was first developed by Campanella et al (1986) for offshore applications: the set-up consisted of a seismic receiver contained in a standard CPT that is pushed into the soil and stopped at pre-determined intervals to measure waves generated at the surface. The most widely used configuration is shown in Figure 1.…”

Section: Acquisitionmentioning

confidence: 99%

Development of a framework for automatic quantification of uncertainty in seismic cone penetration testing

Buckley,

Zheng,

Febrianto

2024

7th International Conference on Geotechnical and Geophysical Site Characterization

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Accurate quantification of the shear wave velocity, Vs, of geo-materials is an important consideration in geotechnical design. Seismic Cone Penetration Testing (SCPT) measures shear wave travel times from a source to in situ receivers along assumed travel paths to calculate Vs. Despite complexities and uncertainties associated with obtaining Vs, results are often reported to designers as a single deterministic profile without an intuitive measure of uncertainty that can be incorporated into the design process. A rigorous workflow to rapidly obtain uncertainty-quantified profiles from SCPT using a Bayesian inversion approach is developed. While similar approaches have been documented, this inversion approach explicitly considers sources of measurement error which are generally neglected (i.e., assumed to be low) in order to deliver more realistic probability distributions of true Vs and improve robustness against imperfect data. Such errors can remain undetected when using traditional approaches, despite potentially leading to inaccuracy. Additionally, an outlier detection framework is incorporated into the workflow to improve accuracy. The workflow is demonstrated by application to a large database of SCPT data. The results show significant improvement over existing methods in terms of robustness and validity, and therefore that the workflow is a valuable tool for practical analyses. Further, they provide crucial insight into the prevalence and magnitude of key errors which are traditionally present but undetected.

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A Seismic Cone Penetrometer for Offshore Applications

Cited by 9 publications

References 3 publications

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

The Fourth James K. Mitchell Lecture: The CPT in offshore soil investigations - a historic perspective

Seismic piezocone interpretation for shear wave velocity (V S) determination in the Persian Gulf

Development of a framework for automatic quantification of uncertainty in seismic cone penetration testing

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