158A 903217 Penetration testing of a desiccated clay crust Bauer, G E; Tanaka, A Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 V1, P477-488. Publ Rotterdam: A A Balkema. 1988 Basic theory of pressuremeter, Marchetti dilatometer, driven screw plate and standard penetration testing is outlined. These 4 methods were used to examine strength and deformation properties of a fissured clay crust. Results are presented as soil strength and modulus profiles with depth, and are compared with each other. In evaluation of results, fissure density, direction. extent and spacing must be taken into account as well as stress path imposed by the test. 903218 Some experience with the dilatometer test in Singapore Chang. M F Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 VI, P489-496. Publ Rotterdam: A A Balkema. 1988 Flat dilatometer (DMT) tests were carried out at 4 sites of Singapore marine clay or peaty clay. Results are compared to those of alternative investigation methods including piezocone, field vane, oedometer and unconsolidated undrained triaxial tests. Ability of the test methods to interpret stress history of the deposits is examined. The validity of some empirical correlations for DMT results is investigated. Comparison of DMT and piczocone data indicates the potential of the DMT. 903219 Estimation of in-situ material strength Danell, R E Rock Mechanics as a Guide for Efficient Utilization o f Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P571-578. Publ Rotterdam." A A Balkema. 1989 A drill monitoring system has been developed to produce in situ strength logs to indicate the location of different strength strata. The system comprises drill instrumentation to monitor depth and penetration rate, drill bit rpm, pull down force, torque, and flushing air pressure, and the mine equipment logger to record the parameters, calculate strata strength indices, and produce logs. The system was successfully applied to delineating different strata types in a coal mine and estimation of lump ore content in a manganese mine. 903220 Rock mass characterisation from drilling Carter, M A; Scoble, M J; Peck, J; Bensoussan, A Proc 15th Canadian Rock Alechanics Symposium, Rock Engineering for Underground Excarations, 3-4 October 1988 PI I-20. Publ Toronto: Unirersity o f Toronto. 1988 Recent field and laboratory studies from the Montreal area are presented. Performance monitoring of the pattern of drilling response, as determined by analysis of parameters such as instantaneous rate of penetration, bit thrust, torque, and rotary speed, can be related to data on rock mass characterisation in terms of lithology, structure and geomechanical properties. Microprocessor based MWD systems which allow rapid data acquisition and processing, and pattern recognition statistical routines to assist differentiation between distinct domains have improved attempts at characterisation. Examples are shown.
903221 Use of dynamic cone penetrometer in determining the strength of existing pavements and subgrades Livneh, M Proc Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 V2. P9.1-9.10. Publ Bangkok: Southeast Asian Geotechnical Society. 1987 A study of the correlation between dynamic cone penetrometer (DCP) and California Bearing Ratio (CBR) tests, carried out in Israel and using both field and laboratory tests, is described. The correlation is seen to be superior to 21 other reported equations for routine use. The coefficient of variability of CBR results for a given material is seen to be higher than that for the cone penetrometer. DCP testing is recommended for pavement and subgrade materials as it does not require the excavation of test pits. 903222 Dynamic cone penetrometer for assessing strength and performance of highway pavements Younger, J S; Tham, L G; Suthersan, B Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 V2. P9.23-9.34. Publ Bangkok: Southeast Asian Geotechnical Society, 1987 DCP testing was used in Bangladesh and Thailand in conjunction with the strength balance method and Benkelman beam deflections to estimate pavement life. Reasonable agreement was found between predictions. The value of modulus obtained from commonly quoted DCP-CBR-E relations differs significantly from that from Benkelman beam deflections. This is because in situ crushed stone modulus is dependent on compaction density and quality of supporting layers. Corrections to the correlation relation are suggested. Suitable areas for use and limitations of the DCP are discussed. 903223 Offshore dilatometer Lunne, T; Jonsrud, R; Eidsmoen, T; Lacasse, S Proc 6th International Symposium on Offshore Engineering, Rio de Janeiro, 24-28 August 1987 116, P256-266. Publ London." Pentech, 1988 The Marchetti dilatometer, widely used for onshore soil investigation, has been modified for offshore use at the NGI. The offshore tool includes a pore pressure sensor. The instrument. data acquisition system, and onshore calibration are described. It can be penetrated into the soil from the seabed or from the bottom of a borehole, and has been successfully used at depths 67-282m. Test results can be interpreted in terms of soil stratigraphy and identification, soil unit weight, lateral stress, overconsolidation ratio, constrained modulus, drained shear strength (sands), and coefficient of consolidation. 903224 New offshore soil investigation tool for measuring the in situ coefficient of permeability and sampling pore water and gas Rad, N S; Sollie, S; Lunne, T; Torstensson, B A Proc BOSS'88, Trondheim, June 1988 VI, P409-417. Publ Trondheim: Tapir, 1988 The onshore BAT water monitoring system has been modified for offshore use. The instrument, inserted into the sea bed using the same equipment as for cone penetration testing, can be used to determine in situ permeability, to collect water/gas samples which can be analysed to evaluate the possibility of free gas in the soil, and to conduct hydraulic fracturing tests to estimate minimum in situ stress. Different approaches to interpretation of test results are presented.
1990 Pergamon Press plc. Reproduction not permitted