Pressuremeter in geotechnical practice

239A compressional velocity in the oil bearing zone was relatively fast compared to that in water saturated sand and shale. Compressional and shear velocities from the logs were in good agreement with those measured on cores in the laboratory.

trained operator with truck-mounted equipment. Data from density and gamma togs is recorded directly on to magnetic tape. It is cheap to use, causes little environmental damage, and can be employed at sites where access is difficult.

876184 Use of in situ tests for foundation design on clay Aas, G; Lacasse, S; Lunne, T; Hoeg, K Norw Geotech lnst Pubi N166, Dec 1986, 15P

876189 Borehole logging made easy and economical. Part Ih the D.O.U. processing and interpretation computer system Smith, E A Proc Symposium on Computer Applications in Geotechnical Engineering, Birmingham, April 1986 P72-79. Publ Birmingham: Midlands Geotechnical Society, 1986

Recent experiences of determination of undrained shear strength of clays are summarised. Procedures and interpretation of field vane tests are first considered. Empirical correction factors suitable for design practice have been derived. Piezocone tests are cheap, simple to perform, and suitable to investigate soil variability. The importance of using the correct cone factor is emphasised. Other tests, such as pressuremeter, dilatometer, seismic, and hydrofracture methods, whose results are subject to greater uncertainty, are briefly examined. 876185 Study of the properties of a sensitive clay with the selfboring pressuremeter (In French) Roy, M; Chi Tien, T Rev Fr Geotech N39, 1987, P41-53 The french type selfboring pressuremeter was used to study properties of sensitive Saint-Alban clay. The working practices of the pressuremeter in sensitive clay were examined, and the influence of certain aspects of the procedure on measured properties evaluated. Results obtained were different to those obtained with the Menard pressuremeter, as the selfboring technique preserves the natural properties of the clay. 876186 Pressuremeter in geotechnical practice Winter, E Trans Res Rec N1089, 1986, Pli-16 The origins of the pressuremeter test are briefly introduced and test preparation and procedures, which are in the process of being standardised, are described. Typical uses of the tests for foundation design, settlement investigation, and pile behaviour are discussed. 876187 Optimizing exploratory drill hole locations Scheck, D E; Chatterjee, P K; Baafi, E Y

Proc 13th CMMI Conference: Geology and Exploration, Singapore, 11-16 May 1986 V2, P15-20. Publ Parkt'ille: CMMI, 1986 Mine planning decisions are traditionally made using information from exploratory drillholes. The best set of holes is the one which gives a specified confidence in estimate with the minimum number of holes. Outcrop data is usually limited to the periphery of the deposit. A method is described which optimises the selection of number and location of extra holes. It uses an iterative procedure based on a mathematical optimisation concept called the fixed point theory. An example of its use is presented. 876188 Borehole logging made easy and economic. Part 1: the driller operated borehole logging unit Brown, A Proc Symposium on Computer Applications in Geotechnical Engineering, Birmingham, April 1986 P67-71. Publ Birmingham: Midlands Geotechnical Society, 1986 The driller operated unit (DOU) is described, which allows high quality geophysical logs to be obtained by the driller. It does not require borehole casing and a separate visit from a

The computer system used to process geophysical logging data from the previously described driller operated unit is described. It is based around an ordinary personal computer. It processes field tapes, provides various plotted logs and has facilities for on-screen graphics and interactive interpretation.

Presentation and interpretation of data 876190 Mine operator's implementation of geostatistics Norrish, N I; Blackwell, G H CIM Bulletin V80, N899, March 1987. P103-I12 Recent advances in small computer technology allow geostatistical packages to be independently implemented on site. The evolution of geostatistical routines for orebodies is described, and problems encountered by downsizing routines to run on minesite computers are examined. An example shows the development of a mineral inventory for two minerals, based on diamond drill data, and the problems arising. To improve estimates for short term planning, an inventory including additional data from production blast holes is prepared. By regularly updating the inventory, many of the uncertainties in mining low grade orebodies can be reduced. 876191 Detection of thin beds with the psuedo-acoustic impedance section Szulyovszky, I Geophys Prospect V35, N3, March 1987, P221-235 A relatively simple method for data processing of sonic logs of layered strata is presented. It has been tested with data from a natural gas field. Detection of the thin beds and evaluation of gas content was more reliable than with the conventional method. 876192 Efficiency of kriging estimation for square, triangular, and hexagonal grids Yfantis, E A; Flatman, G T; Behar, J V Math Geol V19, N3, April 1987, P183-205 Geostatistical techniques, which take into account the Spatial dependence of data from adjacent points, are widely used to analyse geological and geotechnical sampling programs. The efficiency, advantages, and disadvantages of square, equilateral triangular, and regular hexagonal sampling designs in esti•mation of the semivariogram are compared. 876193 Use of the geotechnicai database 'Geoshare' for site investigation data management Raper, J F; Wainwright, D E Q J Engng Geol V20, N3, 1987, P221-330 The database Geoshare has been developed at Queen Mary College, London, as a management system for site investigation data. Data input and retrieval formats are shown, and the

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