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Influence of time dependent material behaviour on determination of rock mechanical parameters (in German)
311A
896179 Index test results and durability characteristics of Drakenberg basalts van Rooy, J L Proc 1st Regional Conference for Africa, Rock Mechanics in Africa, Swaziland, 3-4 November 1988 P53-59. Publ Marshalltown: SANGORM, 1988 The engineering properties, especially durability, of the Drakenburg basalts are needed for the Lesotho Highlands water project. Several tests were carried out to find an easy method to determine index properties. Water absorption tests, ethylene glycol soak tests, wet/dry cycle tests, exposure to atmosphere and petrographic description were undertaken. The samples were divided into 6 types on the basis of secondary clay and amygdale content. Preliminary results are outlined. Water absorbtion seems possible as an index test of basalt durability.
In Situ Stress Measurement of in situ stress See also: 896072, 896104 896180 Influence of time dependent material behaviour on determination of rock mechanical parameters (In German) Pahl, A; Heusermann, S Felsbau V7, N2, May 1989, P99-106 In situ stresses have been measured in evaporitic rocks using the BGR overcoring method, the borehole dilation method with dilatometers, and the borehole inclusion method using Giotzl cells. Numerical analysis shows interpretation of measured data must take into account phenomena of plasticity, creep, and stress relaxation in rocks demonstrating rheologic behaviour.
896181 Alto Lindoso underground power station - geoteehnical characterisation Sousa, L R; Barroso, M G; Lamas, L M Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12-16 September 1988 V1. P389-396. Publ Rotterdam." A A Balkema, 1988 The Alto Lindoso plant in Portugal is constructed in generally sound, medium to coarse granite. Stress state was characterised using stress tensor tube and small fiat jack methods, and deformability by large flat jack methods. Laboratory tests were used to measure rock and joint shear properties, and joint sets and discontinuities characterised by field investigations. In situ stress measurements were interpreted using a three dimensional boundary element model.
896182 Calibration measurements of rock stress by vibrating wire stremmeter at high temperatures Dutta, P K; Hatfield, R W Proc 2nd International Symposium on Field Measurements in Geomecham'cs, Kobe, 6-9 April 1987 V1, P43-58. Publ Rotterdam: A A Balkema, 1988 A test program to correlate stress meter readings with stresses was carried out on 4 materials, 2 granites, aluminium and lucite, under uniaxial, biaxial and triaxial stress fields. Biaxial tests were performed by setting stressmeters into cylindrical rock cores loaded hydrostatically around their periphery, and
triaxiai tests by repeating biaxial tests with end loading. The tests were carried out at temperatures ranging from room temperature to 100 deg C. Results show the uniaxial stress sensitivity factor can vary widely and is sensitive to temperature under biaxial and triaxial loading tests.
896183 Improvements to standard doorstopper and Leeman cell stress measuring techniques Gill, D E; Corthesy, R; Ouellet, J; Dube, P B; Nguyen, D Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 VI, P75-83. Publ Rotterdam: A A Balkema, 1988 Modifications have been made to the standard doorstopper and Leeman cells and to their operational procedures to increase their use. The instruments can now record strain continuously during stress release and measure stress in flooded or wet holes. The modifications are described. Eflicency of the improvements is shown by a series of strain recovery curves obtained during overcoring. Modifications to temperature compensation procedures are also described.
896184 Stable, bigh-precision borehole deformation instrument for monitoring changes in rock stress Biackwood, R L; Buckingham, C Proc 2nd International Symposium on Field Measurements in Geomechnaics, Kobe, 6-9 April 1987 V1, P85-94. Publ Rotterdam: A A Balkema, 1988 Stress change monitoring techniques and their disadvantages are briefly outlined. A new instrument has been developed which makes use of a re-usable borehole device to measure borehole diameter deformation. A Moire fringe optical technique is used to measure displacement and microprocessor control to transmit data in digital form. The new instrument is very stable and is unaffected by creep of the material, amplifier drift or temperature change.
896185 Diametral deformation method for in-situ stress measurement Kikuchi, S; Nakamura, T; Serata, S Proc 2nd International Symposium on Field Measurements in Geomeehanics, Kobe, 6-9 April 1987 V1, P95-104. Publ Rotterdam: A A Balkema, 1988 The double fracturing method, which determines stress state in a hard brittle rock by longitudinally fracturing the borehole boundary rock in 2 mutually perpendicular fracture orientations, is described. In situ measurements have been made in a wide range of rocks using the technique. Application of the method in sandstone, andesite and gneiss is presented. The stressmeter probe, based on the method, is effective to determine stress state in brittle, fractured rock.
896186 Measurement and monitoring of rock stress by mesas of flatjack, pressure capsule and hydraulic fracturing techniques at Yanahara mine Ogino, S; Mizuta, Y; Sano, O; Araki, H Proc 2nd International Symposium on Field Measurements in Geomeclumics, Kobe, 6-9 April 1987 V1, P105-114. Publ Rotterdam: A A Balkema, 1988 The underground opening of the mine was monitored to confirm safety of secondary mining of the ore body. Rock stress was measured using a flat jack, using both the conventional method, and the lune flatjack inserted in a slot cut by a diamond wheel saw, which seems more reliable. Stress change around the stope was monitored with a pressure capsule. Hydraulic fracturing was also used to monitor rock stress.
© 1989 Pergamon Press plc. Reproduction not permitted
896179 Index test results and durability characteristics of Drakenberg basalts van Rooy, J L Proc 1st Regional Conference for Africa, Rock Mechanics in Africa, Swaziland, 3-4 November 1988 P53-59. Publ Marshalltown: SANGORM, 1988 The engineering properties, especially durability, of the Drakenburg basalts are needed for the Lesotho Highlands water project. Several tests were carried out to find an easy method to determine index properties. Water absorption tests, ethylene glycol soak tests, wet/dry cycle tests, exposure to atmosphere and petrographic description were undertaken. The samples were divided into 6 types on the basis of secondary clay and amygdale content. Preliminary results are outlined. Water absorbtion seems possible as an index test of basalt durability.
In Situ Stress Measurement of in situ stress See also: 896072, 896104 896180 Influence of time dependent material behaviour on determination of rock mechanical parameters (In German) Pahl, A; Heusermann, S Felsbau V7, N2, May 1989, P99-106 In situ stresses have been measured in evaporitic rocks using the BGR overcoring method, the borehole dilation method with dilatometers, and the borehole inclusion method using Giotzl cells. Numerical analysis shows interpretation of measured data must take into account phenomena of plasticity, creep, and stress relaxation in rocks demonstrating rheologic behaviour.
896181 Alto Lindoso underground power station - geoteehnical characterisation Sousa, L R; Barroso, M G; Lamas, L M Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12-16 September 1988 V1. P389-396. Publ Rotterdam." A A Balkema, 1988 The Alto Lindoso plant in Portugal is constructed in generally sound, medium to coarse granite. Stress state was characterised using stress tensor tube and small fiat jack methods, and deformability by large flat jack methods. Laboratory tests were used to measure rock and joint shear properties, and joint sets and discontinuities characterised by field investigations. In situ stress measurements were interpreted using a three dimensional boundary element model.
896182 Calibration measurements of rock stress by vibrating wire stremmeter at high temperatures Dutta, P K; Hatfield, R W Proc 2nd International Symposium on Field Measurements in Geomecham'cs, Kobe, 6-9 April 1987 V1, P43-58. Publ Rotterdam: A A Balkema, 1988 A test program to correlate stress meter readings with stresses was carried out on 4 materials, 2 granites, aluminium and lucite, under uniaxial, biaxial and triaxial stress fields. Biaxial tests were performed by setting stressmeters into cylindrical rock cores loaded hydrostatically around their periphery, and
triaxiai tests by repeating biaxial tests with end loading. The tests were carried out at temperatures ranging from room temperature to 100 deg C. Results show the uniaxial stress sensitivity factor can vary widely and is sensitive to temperature under biaxial and triaxial loading tests.
896183 Improvements to standard doorstopper and Leeman cell stress measuring techniques Gill, D E; Corthesy, R; Ouellet, J; Dube, P B; Nguyen, D Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 VI, P75-83. Publ Rotterdam: A A Balkema, 1988 Modifications have been made to the standard doorstopper and Leeman cells and to their operational procedures to increase their use. The instruments can now record strain continuously during stress release and measure stress in flooded or wet holes. The modifications are described. Eflicency of the improvements is shown by a series of strain recovery curves obtained during overcoring. Modifications to temperature compensation procedures are also described.
896184 Stable, bigh-precision borehole deformation instrument for monitoring changes in rock stress Biackwood, R L; Buckingham, C Proc 2nd International Symposium on Field Measurements in Geomechnaics, Kobe, 6-9 April 1987 V1, P85-94. Publ Rotterdam: A A Balkema, 1988 Stress change monitoring techniques and their disadvantages are briefly outlined. A new instrument has been developed which makes use of a re-usable borehole device to measure borehole diameter deformation. A Moire fringe optical technique is used to measure displacement and microprocessor control to transmit data in digital form. The new instrument is very stable and is unaffected by creep of the material, amplifier drift or temperature change.
896185 Diametral deformation method for in-situ stress measurement Kikuchi, S; Nakamura, T; Serata, S Proc 2nd International Symposium on Field Measurements in Geomeehanics, Kobe, 6-9 April 1987 V1, P95-104. Publ Rotterdam: A A Balkema, 1988 The double fracturing method, which determines stress state in a hard brittle rock by longitudinally fracturing the borehole boundary rock in 2 mutually perpendicular fracture orientations, is described. In situ measurements have been made in a wide range of rocks using the technique. Application of the method in sandstone, andesite and gneiss is presented. The stressmeter probe, based on the method, is effective to determine stress state in brittle, fractured rock.
896186 Measurement and monitoring of rock stress by mesas of flatjack, pressure capsule and hydraulic fracturing techniques at Yanahara mine Ogino, S; Mizuta, Y; Sano, O; Araki, H Proc 2nd International Symposium on Field Measurements in Geomeclumics, Kobe, 6-9 April 1987 V1, P105-114. Publ Rotterdam: A A Balkema, 1988 The underground opening of the mine was monitored to confirm safety of secondary mining of the ore body. Rock stress was measured using a flat jack, using both the conventional method, and the lune flatjack inserted in a slot cut by a diamond wheel saw, which seems more reliable. Stress change around the stope was monitored with a pressure capsule. Hydraulic fracturing was also used to monitor rock stress.
© 1989 Pergamon Press plc. Reproduction not permitted