94A

902235 Experimental study on seabed stability during earthquakes and waves Kawakami, T; Hamada, M; Kitahara, M; Gotoh, Y; Koide, T Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 VI, P443-450. Publ Rotterdam." A A Balkema, 1988

The dynamic properties and strength of a seabed foundation are important in the design of offshore structures. An observa- tion system has been developed which measures acceleration in the sea bed and platform and pore pressure in the soil layers. Results from the system during a free vibration test and an earthquake are presented.

902239 V~lly is instrumentation necessary for underground openings? Goel. R K, Jethwa, J L Proc International Symposium TunneUing for Water Resources and Power Projects, New Delhi, 19-23 January 1988 V1, P337-342. Publ New Delhi: Oxford and IBH Publishing Co, 1988

In design of realistic support systems for underground open- ings, behaviour of the rock mass should be monitored. Use of instrumentation to verify design, improve state-of-the-art knowledge, prove the adequacy of new construction tech- niques, control construction, reduce construction cost, improve safety, and provide legal protection and enhanced public relations is described.

902236 New techniques for monitoring the behavior of slopes Kimura, K; Kurosawa, N; Tokutomi, K Proc 2nd International Symposium on Field zTleasurements in Geomechanics, Kobe, 6-9 April 1987 VI, P557-564. Publ Rotterdam: A A Balkema, 1988

Two recently developed slope monitoring systems are described, the data acquisition system for long-term automatic measurement at locations where no commercial power line outlet is available, and the monitoring system by data trans- mission from inaccessible or dangerous sites.

902237 Landslide measuring system by newly developed three- dimensional displacement-meter Suzuki, K, Kawada, T; Mashiko, S Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 VI, P565-571. Publ Rotterdam: A A Balkema, 1988

A remote monitoring system for measuring landslide move- ment has been developed. The 3-D displacement meter, con- sisting of 2 angle measuring units and an extensometer, used to monitor change in distance between given measuring points is described. The electrical circuit used to transmit pulse data is described.

Analysis Techniques and Design Methods

See also: 902139, 902142

902240 Experiences with the analysis of geotechnicai problems solved by the FEM using different equation solvers on several computers Schad, H; Breinlinger, F Proe 6th International Conference on Numerical Methods in Geomechanics, lnnsbruck, 11-15 April 1988 V1. P183-187. Publ Rotterdam: A A Balkema, 1988

A block equation solver for nonsymmetric matrices according to the Gauss method is described. Tests were carried out on mainframe computers to study the influences of programming and compilation features on the efficiency of this and other solvers. The example used to illustrate performance is a raft foundation on piles with complicated boundary conditions.

902238 Integration of field instrumentation and computer simulation: development and application of the SPDR method Serata, S Proc 2nd International Symposium on Field Aleasurements in Geomechanics, Kobe, 6-9 April 1987 I/2, P613-624. Publ Rotterdam: A A Balkema, 1988

The SPDR method, developed to solve ground control problems in Canadian potash mines, is presented. Stress state (S), material properties (P), and ground conditions (D) are measured and monitored and input into the REM finite ele- ment code (R). The instrumention, program, REM constitu- tive model, and REM simulation model are described. Its application to a salt mine, calibration of basic ground condi- tions, and new mine design analysis are illustrated. Applicabil- ity, interpretation, and accuracy are discussed.

902241 Improved algorithm for non-linear analysis by the finite element method Humbert, P; Mestat, P Proc 6th International Conference on Numerical Methods in Geomechanics, innsbruek, 11-15 April 1988 VI, P195-204. Publ Rotterdam: A A Balkema, 1988

Some basic resolution methods for nonlinear finite element analysis using the displacement formulation are reviewed and described. The methods are applied in elastoplastic analyses at small deformation: thick cylinder under internal pressure, thick cylinder in strain hardening materials, and a tunnel in plane strain. The Davidon-Fletcher-Powell (DFP) method combined with the initial stress method is much more efficient than the initial stress method. The DFP scheme is the most accurate, stable, and time saving solution, and can be simply implemented in existing finite element codes.

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