Author : Geoffrey R. Martin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (936 download)
Book Synopsis Evaluation of Cone Penetrometer Testing to Determine in Situ State of Sands by : Geoffrey R. Martin
Download or read book Evaluation of Cone Penetrometer Testing to Determine in Situ State of Sands written by Geoffrey R. Martin and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Verification of the densities for artificial sand fill islands in the Beaufort Sea is currently carried out using the cone penetration test (CPT). Cone penetration resistance is converted to relative density using one of the correlations published by Baldi et al (1982), Villet and Mitchell (1981) or Schmertmann (1975). These correlations have been derived on the basis of prototype chamber CPT tests on clean, generally dense, sands. Sand fills in the Beaufort Sea contain nominal silt fractions (1-5% fines) and the densities of interest are frequently less than those reported in the CPT chamber test programs. There is no sound justification that these published correlations in terms of relative density are valid for evaluation of sand fills in the Beaufort Sea. Ideally, a correlation between cone resistance and density would be developed for each sand type used in island construction. Such a program of CPT chamber tests would be extremely costly and time consuming. Early in 1984, Golder Associates proposed an alternative approach to CPT interpretation to Dome Petroleum, based on the state parameter approach to sand behaviour. It was hypothesized that the cone penetration resistance could be uniquely related to the state parameter, and that this correlation may be equally applicable to clean and silty sands. The initial phase of the evaluation of the state parameter approach to CPT interpretation involved a reinterpretation of existing calibration chamber test data in terms of state parameter. In order to do this, the Steady State line for each of the relevant CPT calibration sands must be known. The findings of the initial evaluation of the CPT/state interpretation are contained in this report.... One of the objectives of this study was to determine which correlation, if any, is most applicable to silty Beaufort Sea sand fills. On the basis of laboratory testing data, the CPT correlation sands essentially show the same engineering behaviour at large (failure) strains as Beaufort Sea sands, with or without silt. On this basis, any of the correlations with state parameter are applicable and the data on Figure 13 could readily be used to determine in situ state from CPT tests with reasonable accuracy. The significant point of the study is that a state parameter approach to CPT interpretation provides a rational interpretation of cone resistance in silty sands. Many of the problems associated with interpretation in terms of relation density along are avoided using the state parameter approach"--ASTIS database.
