Offshore geotechnical investigation in South China Sea

Offshore geotechnical investigation in South China Sea

104A 932253 Correlation study between standard penetration and pressuremeter tests (In French) Gonin, H; Vandangeon, P; Lafeuillade, M P Rev Fr Geotec...

122KB Sizes 3 Downloads 91 Views

104A 932253 Correlation study between standard penetration and pressuremeter tests (In French) Gonin, H; Vandangeon, P; Lafeuillade, M P Rev Fr Geotech N58, 1992, P67-78 Correlations between results of pressuremeter and standard penetration tests are examined using data from 9 sites including clays, sands, marls, and chalk around Paris and northern France. Statistical relations are evaluated between SPT N count, pressuremeter limit pressure, and soil moduli. Finally, the types of formation in which each (or both) test is representative are discussed.

932254 Significance of two-point strain measurement hi SPT Matsumoto, T; Sekiguchi, H; Yoshida, H; Kita, K Soils Found V32, N2, June 1992, P67-82 The SPT is popular but its fundamentals are not well understood. To study the dynamics of the SPT, strain gauges are often mounted at two different stations along a driven rod. By making use of the travelling time between the two gauge stations, it is possible to identify particle velocity, displacement, and strain at any point in the rod and energy transmitted from the hammer to the rod. A procedure for handling errors in strain data is developed and validated against test results. An attempt is also made to identify the resistance of the soil to the penetrating sampler using wave-equation analysis with a calculated impact stress as input.

932255 Efficient sequential sampling strategies for environmental monitoring Mukhopadhyay, N; Bendel, R B; Nikolaidis, N P; Chattopadhyay, S Water Resour Res N28, N9, Sept 1992, P2245-2256 Sampling to monitor environmental pollution is a costly process and statistical methods should be applied to identify effective sampling strategies. Purely sequential, accelerated sequential, and three-stage procedures are evaluated as effective sampling methods. Data from 768 lakes in the Eastern Lake Survey are used as a lake population distribution. Accelerated sequential and three-stage procedures are better than pure sequential, requiring fewer sampling operations without significant loss of efficiency. Savings in sample size up to 60% as compared to traditional sampling methods are possible, depending on the precision required.

932256 Data base system of boring logs and its application to drawing a geological profile Furusawa, W; Iwakuma, S; Nakayama, H; Imaizumi, S Proe 6th lnterutional Congress International Association of Eng'meeriug Geology, Amsterdam, 6-10 August 1990, Symposia P39-46. Publ Rotterdam: A A Balkema, 1990 A PC based database system developed to assist in geotechnical investigation of the Kumamoto Plain in Japan is described. Qualitative and quantitative data from borehole logging sheets are input to data files using the routine BRINPUT. BRCORREC corrects and appends data already present in the data bank. BRSEARCH can graphically display log details on screen or plotter, select the most adjacent logs for a given ~ite, and interpret and display details between two boreholes.

932257 Offshore geotechnical investigation in South China Sea Yu, Y; Guo, J Y; Axelsson, K Proc 6th International Congress International Association of Engineering Geology Amsterdam, 6-10 August 1990, Symposia P311-316. Publ Rotterdam: A A Balkema, 1990 Site investigations for the construction of an offshore gravity platform are described. In situ CPTs and borehole sampling were carried out from a survey vessel in order to enable characterisation of the seabed soil layers. Stratigraphy and mechanical and physical properties of the 8 layers delineated are described. The topmost layer lacks sufficient strength to act as a bearing layer. The stability of subsequent layers under static and cyclic loading is discussed.

932258 Piezocone testing to predict soft soil settlement Jones, G A; Rust, E Proc Tenth Regional Conference for Africa on Soil Mechanics and Foundation Engineering and the Third International Conference on Tropical and Residual Soils, Museru, 23-27 September 1991 V1, P283-290. Publ Rotterdam: A A Balkema, 1991 Piezocone testing is a practical field technique suitable for recent alluvial deposits. It is essentially a semi-empirical method and its output must be correlated with parameters measured by other methods. Data are presented from three major road embankments for which initial laboratory test results and subsequent monitoring data are available. Correlations allow constrained modulus coefficient and a cone time factor to be obtained from piezocone data so that coefficients of compressibility and consolidation can be obtained for the alluvial soils. The constrained modulus coefficients obtained differ from literature values, possibly because the soils are highly stressed.

Presentation and interpretation of data 932259 Risk analysis for mine scheduling by conditional simulation Ravenscroft, P J Traus lnst Miu Metall (Sect A Min ind) VIOl, May-Aug 1992, PAIO4-AI08 Risk analysis in mine scheduling is often performed without considering the potential variability in a mineral reserve estimate. The possible error in estimation and spatial variability can be quantified by geostatistical methods of reserve estimation, but this does not allow for simple use of this information in sensitivity analysis. The method of conditional simulation is proposed to permit the incorporation of both variability in the distribution and estimation error in mine scheduling. The background of the conditional simulation technique is described and an example of its use illustrated.

932260 Fuzzy objective functions applied to the analysis of discontinuity orientation data Harrison, J P Proe ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P25-30. Publ London: Thomas Telford, 1992 An analysis of discontinuity orientation is generally included in engineering rock mass classifications. The application of pattern recognition algorithms based on fuzzy objective functions is proposed for this purpose. Conventional analysis methods and their shortcomings are first introduced. A description of the use of objective functions is presented and

© 1993 Pergamon Press Ltd. Reproduction not permitted