Seafloor Penetration Tests: Presentation and Analysis of Results

Migliore, H. J.; Lee, H. J.

doi:10.21236/ad0732367

Cited by 4 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This could lead to systematic differences in strength separate from disturbance effects. However, on the basis of previous research on vane rotation rate effects (Migliore and Lee, 1971; Halwacks and Monney, 1972) , it appears as if these systematic differences are minimal (less than ten percent change in strength) . The residual negative pore pressure was measured with a device consisting of a pressure transducer connected to a ceramic disk with a nominal air penetration pressure of one bar.…”

Section: Laboratory Testsmentioning

confidence: 95%

In-situ strength of seafloor soil determined from tests on partially disturbed cores / by H.J. Lee.

Lee¹

1973

View full text Add to dashboard Cite

The major obstacle to rational design of seafloor foundations and anchors has been a lack of good quality information on the bottom sediment engineering properties. Considerable engineering property data have been obtained through laboratory testing of core samples, but most of these data are of questionable validity because of the sample disturbance factor. To improve the usability and credibility of laboratory test data, an experimental investigation was undertaken to determine the extent of disturbance involved in seafloor soil sampling and handling. In-situ tests were performed and related to comparable laboratory tests. The soils tested were from the Santa Barbara Channel with a terrigenous (land-derived) origin. A technique based on earlier work was developed for predicting in-situ shear strength on the basis of laboratory test results. Various disturbance mechanisms including sampling, vibration, long-term nonref rigerated storage, and water and air expansion were investigated and analyzed quantitatively. Strength reductions varying between 15 and 50 percent were observed to result from these disturbances. The in-situ strength prediction procedure appears to be capable of compensating for all forms of disturbance except for those developing as a result of gas expansion.

show abstract

Section: Laboratory Testsmentioning

confidence: 95%

In-situ strength of seafloor soil determined from tests on partially disturbed cores / by H.J. Lee.

Lee¹

1973

View full text Add to dashboard Cite

show abstract

“…The sediment penetration resistance was obtained by numerically integrating the Poncelet equation after calculating or assuming a number of sediment properties: a frontal dynamic shear strength of twice the static undrained shear strength shown in Figure 6, (Migliore and Lee, 1971;True, 1975), the side-resistance equalled the frontal dynamic shear strength reduced by a factor of four-fifths (representing a strength sensitivity of 5), friction angle, and mass bulk density. Of the three methods proposed, Valent and Lee concluded that insertion into drilled holes is the best technique for high-level waste disposal because virtually any burial depth can be attained and the hole can be filled behind the waste.…”

Section: Prediction Of Penetration Depthmentioning

confidence: 99%

Embedment, penetration, hole closure, and related geotechnical tests associated with subseafloor nuclear waste disposal

Winters¹

1987

Open-File Report

View full text Add to dashboard Cite

This report examines some of the factors involved with disposal of both high-level and low-level radioactive waste beneath the seafloor. Topics covered include: (1) seafloor sediment properties, which relate to free-fall emphasized methods of disposal; (2) techniques for predicting embedment or penetration from free-fall of low-level and high-level waste; (3) hole closure behind a penetrating cannister; and (4) geotechnical testing required to predict free-fall penetration depths.

show abstract

“…Migliore and Lee (1971) describe the successful use of the Naval Civil Engineering Laboratory's heavy, free-falling dynamic penetrometer, and Dayal and Allen (1973) report on the design of a dynamic cone penetrometer. Texas A & M University and the Sandia Corporation have been experimenting for several years with self-contained, telemetering, dynamic cone penetrometers that utilize accelerometers to measure the resistance to penetration of the device.…”

Section: In Situ Measurementsmentioning

confidence: 99%

Review of continental shelf marine geotechnics: Distribution of soils, measurement of properties, and environmental hazards

Richards

Palmer

Perlow

1975

Marine Geotechnology

View full text Add to dashboard Cite

Sands and silty sands are the predominant surficial soils of continental shelves. Cohesive fine-grained soils are typical off the mouths of large rivers, near bays and estuaries, and in basins located on the shelf. The stratigraphy of shelf soils is very poorly known for most engineering purposes, except in the vicinity of the Mississippi Delta.Vibratory coring is the most common method of sampling shelf sands to depths of about 13 m; greater soil depths are sampled by borings often using drilling and wireline sampling tools. Employment of self-contained or wireline static cone penetrometers to obtain in situ measurements of sands has not been as common in the United States as in Europe. Dynamic piston corers are the most common samplers in cohesive soils, but rotary and hydraulically activated incremental corers are becoming available for marine use. Selfcontained or wireline vane shear devices and static cone penetrometers are used for the in situ testing of cohesive soils, and the latter device is also used for cohesionless soils. Dynamic cone penetrometers have been developed and have had limited experimental use at sea. In situ electrical resistivity and nuclear-transmission and backscatter probes have been used in cohesive soils to obtain bulk-

show abstract

Seafloor Penetration Tests: Presentation and Analysis of Results

Cited by 4 publications

References 1 publication

In-situ strength of seafloor soil determined from tests on partially disturbed cores / by H.J. Lee.

In-situ strength of seafloor soil determined from tests on partially disturbed cores / by H.J. Lee.

Embedment, penetration, hole closure, and related geotechnical tests associated with subseafloor nuclear waste disposal

Review of continental shelf marine geotechnics: Distribution of soils, measurement of properties, and environmental hazards

Contact Info

Product

Resources

About