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Computer-controlled open-air-extensometers-employment at the rock-slide-area Maratea (Italy)
136A 893237 Observation and adjustment of a geodetic survey network for measurement of landslide movement Bromhead, E N; Curtis, R D; Schofield. W Proc 5th International Symposium on Landslides, Lausanne. 10-15 July 1988 VI. P383-386. Publ Rotterdam. A A Balkema. 1988
893241 Portable device for measuring displacements along rock fractures Gulla, G; Nicoletti, P G: Sorriso-Valvo, M Proc 5th International Symposium on Landslides. Lausanne, 10-15 July 1988 VI, P423-426. Publ Rotterdam: A A Balkema, 1988
A 6 station geodetic network was set up at St. Catherine's Point, Isle of Wight, to detect and measure movements of a large landslide complex, The network and field surveying technique are described. Results are analysed in 3 stages: (1) initial manipulation of observations, such as elimination of errors and corrections for temperature and pressure; (2) computation and adjustment, using the variation of coordinates method; and (3) strength analysis, in which precision of the network is obtained with error ellipses.
The fracturometer is a simple device designed to make simultaneous and accurate measurements of the horizontal and vertical distances between bench-marks located on opposite sides of rock fractures. The instrument comprises 2 graduated mobile aluminium bars kept orthogonat by a crossing block. Accuracy of the instrument was tested in the laboratory, using repeated measurements between three stakes, and in the field, by placing 4 series of stakes along 2 fractures of a block slide. There are some problems with vertical accuracy.
893238 Assessing the precision of inclinometric measures by means of an experimental apparatus Devin, P E; Pezzetti, G; Ricciardi, C; Tommasi, P Proc 5th International Symposium on Landslides, Lausanne. 10-15 July 1988 VI. P393-398. Publ Rotterdam." A A Balkema. 1988 inclinometers and extensoinclinometers are widely used to monitor displacement of landslide masses. The precision of the instruments is discussed, based on available literature. The instruments were tested under controlled conditions to analyse their reliability and examine the parameters affecting in situ measurements. Results are analysed statistically.
893239 Radiotransmission of monitoring of a landslide: Grand'Maison reservoir, Billan landslide (In French) Dubie, J Y; Benefice, P; Guitton, C Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V1, P399-404. Publ Rotterdam: A A Balkema, 1988 A landslide upstream from a HEP station has been studied using manual and automated monitoring systems. Manual monitoring included photogrammetric analysis, inclinometers and piezometers. Due to winter inaccessibility, automated piezometers, inclinometers and extensometers were used. The instruments and the recording apparatus, which uses radiotransmission, are described. Results enabled structure and stability of the landslide to be determined, and efficiency of the remedial measures verified.
893242 Monitoring and interpretation of sandstone block movements on a table hill margin Kostak, B; Cacon, S Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P439-442. Publ Rotterdam: A A Balkema, 1988 Monitoring of sandstone block movements in the StoloweGory mountains was undertaken using a spatial geodetic network. local geodetic networks and precise crack dilatometric measurements. Results from the geodetic networks and crack gauges do not show good agreement, a factor explained by oscillations in the groundwater table. 893243 Real time monitoring system of an unstable slope (In French) Matichard. Y; Pillard. J Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P459-462. Publ Rotterdam: A A Balkema, 1988 A monitoring system for unstable slopes has been developed. The system is demonstrated at an experimental site with instability typical of marl formations. Inclinometers, piezometers and rain gauges are used to collect the data, which are then processed through a computer.
Analysis Techniques and Design Methods See also." 893134. 893174, 893175, 893367
893240 Computer-controlled open-air-extensometers--employment at the rock-slide-area Maratea (Italy) Grabowski, J Proc 5th International Symposium on Landslides, Lausanne, 10-15 1988 VI. P411-414. Publ Rotterdam: A A Balkema, 1988 Eight extensometers were installed to monitor rock slide movement in the Maratea area. Features of the extensometers and recording apparatus, such as invar wire and reel, sensor, multiplexer and power converter, are described. Reliability of results, with respect to sag of wire and elasticity and friction, is discussed.
893244 Element-by-element methods in geomechanics Smith, I M; Wong, S W Proc ECONMIG 86, Stuttgart, 16-18 September 1986 I/2. 13P. Publ Stuttgart: University o f Stuttgart, 1986 Geomechanical problems are often three dimensional, Global matrices used in computation are very large, and fast computers with high storage capabilities are required, which are expensive and of limited availability. Consequently, techniques which avoid global matrix assembly and work with only element size arrays are under investigation. The use of the element-by-element approach to a three dimensional slope stability problem is illustrated.
1989 Pergamon Press plc. Reproduction not permitted
893241 Portable device for measuring displacements along rock fractures Gulla, G; Nicoletti, P G: Sorriso-Valvo, M Proc 5th International Symposium on Landslides. Lausanne, 10-15 July 1988 VI, P423-426. Publ Rotterdam: A A Balkema, 1988
A 6 station geodetic network was set up at St. Catherine's Point, Isle of Wight, to detect and measure movements of a large landslide complex, The network and field surveying technique are described. Results are analysed in 3 stages: (1) initial manipulation of observations, such as elimination of errors and corrections for temperature and pressure; (2) computation and adjustment, using the variation of coordinates method; and (3) strength analysis, in which precision of the network is obtained with error ellipses.
The fracturometer is a simple device designed to make simultaneous and accurate measurements of the horizontal and vertical distances between bench-marks located on opposite sides of rock fractures. The instrument comprises 2 graduated mobile aluminium bars kept orthogonat by a crossing block. Accuracy of the instrument was tested in the laboratory, using repeated measurements between three stakes, and in the field, by placing 4 series of stakes along 2 fractures of a block slide. There are some problems with vertical accuracy.
893238 Assessing the precision of inclinometric measures by means of an experimental apparatus Devin, P E; Pezzetti, G; Ricciardi, C; Tommasi, P Proc 5th International Symposium on Landslides, Lausanne. 10-15 July 1988 VI. P393-398. Publ Rotterdam." A A Balkema. 1988 inclinometers and extensoinclinometers are widely used to monitor displacement of landslide masses. The precision of the instruments is discussed, based on available literature. The instruments were tested under controlled conditions to analyse their reliability and examine the parameters affecting in situ measurements. Results are analysed statistically.
893239 Radiotransmission of monitoring of a landslide: Grand'Maison reservoir, Billan landslide (In French) Dubie, J Y; Benefice, P; Guitton, C Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 V1, P399-404. Publ Rotterdam: A A Balkema, 1988 A landslide upstream from a HEP station has been studied using manual and automated monitoring systems. Manual monitoring included photogrammetric analysis, inclinometers and piezometers. Due to winter inaccessibility, automated piezometers, inclinometers and extensometers were used. The instruments and the recording apparatus, which uses radiotransmission, are described. Results enabled structure and stability of the landslide to be determined, and efficiency of the remedial measures verified.
893242 Monitoring and interpretation of sandstone block movements on a table hill margin Kostak, B; Cacon, S Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P439-442. Publ Rotterdam: A A Balkema, 1988 Monitoring of sandstone block movements in the StoloweGory mountains was undertaken using a spatial geodetic network. local geodetic networks and precise crack dilatometric measurements. Results from the geodetic networks and crack gauges do not show good agreement, a factor explained by oscillations in the groundwater table. 893243 Real time monitoring system of an unstable slope (In French) Matichard. Y; Pillard. J Proc 5th International Symposium on Landslides, Lausanne, 10-15 July 1988 VI. P459-462. Publ Rotterdam: A A Balkema, 1988 A monitoring system for unstable slopes has been developed. The system is demonstrated at an experimental site with instability typical of marl formations. Inclinometers, piezometers and rain gauges are used to collect the data, which are then processed through a computer.
Analysis Techniques and Design Methods See also." 893134. 893174, 893175, 893367
893240 Computer-controlled open-air-extensometers--employment at the rock-slide-area Maratea (Italy) Grabowski, J Proc 5th International Symposium on Landslides, Lausanne, 10-15 1988 VI. P411-414. Publ Rotterdam: A A Balkema, 1988 Eight extensometers were installed to monitor rock slide movement in the Maratea area. Features of the extensometers and recording apparatus, such as invar wire and reel, sensor, multiplexer and power converter, are described. Reliability of results, with respect to sag of wire and elasticity and friction, is discussed.
893244 Element-by-element methods in geomechanics Smith, I M; Wong, S W Proc ECONMIG 86, Stuttgart, 16-18 September 1986 I/2. 13P. Publ Stuttgart: University o f Stuttgart, 1986 Geomechanical problems are often three dimensional, Global matrices used in computation are very large, and fast computers with high storage capabilities are required, which are expensive and of limited availability. Consequently, techniques which avoid global matrix assembly and work with only element size arrays are under investigation. The use of the element-by-element approach to a three dimensional slope stability problem is illustrated.
1989 Pergamon Press plc. Reproduction not permitted