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Development of a piezomagnetic method to determine fault-related stress variations
31A
931228 Application of hemispherical-ended borehole technique to hot rock Obara, Y; Sugawara, K; Sakagushi, K; Mizuochi, Y Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V1, P587-590. Publ Rotterdam: A A Balkema, 1991 The hemispherical-ended borehole stress relief technique allows complete state of stress in a rock mass at a certain point to be evaluated from measurements in a single borehole. Its modification for use in hot rock, such that original rock stress can be determined independent of thermal stress, is described. A new spherical strain cell with 17 elements has been developed. Applications in a gold mine at temperatures of 50 and 80 deg C are illustrated. Results indicate this method to be effective in a homogeneous rock mass.
931229 Dynamic stress measurements using piezomagnetism Martin, R J; Noel, J S Proe 33rd US Symposium on Rock Mechanics, Santa Fe, 3-5 June 1992 P69-77. Publ Rotterdam: A A Balkema, 1992 Laboratory tests indicate a decrease in remanent magnetization of rock on loading, which becomes permanent on unloading, the drop being proportional to peak stress experienced. A field experiment was carried out to see if this effect could be used to measure peak stress as a function of distance from an underground chemical explosion. Cores of gabbro and diabase of known magnetic properties were grouted along the grouttuff interface of the access drift at the G Tunnel site, prior to a lton HE explosion. Post-detonation measurements and laboratory data were used to develop a peak stress-distance relation.
931230 Development of a piezomagnetic method to determine fanltrelated stress variations Narbutovskih, S M; Martin, R J; Greenfield, R J Proc 33rd US Symposium on Rock Mechanics, Santa Fe, 3-5 June 1992 P79-88. Publ Rotterdam: A A Balkema, 1992 Different techniques for estimating fault-related stress variations produce a wide range of results. A technique has been developed to enable continuous monitoring of current stress regime over an active fault in order to clarify the position. It is based on the stress dependency of rock piezomagnetic propertics. Measurements made across the Teal Creek fault in Amchitka Island in the Aleutian arc during the detonation of an underground nuclear explosion and laboratory data on basalt cores retrieved from over lkm depth nearby are presented. It is shown that the method is promising for continuous monitoring of tectonic stress levels.
Site Investigation and Field Observation See. 931504
Remote sensing and photographic techniques 931231 Criteria for stratigraphic correlation using aerial photographs: examples from the South-Central Pyrenees Sgavetti, M Bull Am Assoc Petrol Geoi V76, N5, May 1992, P708-730 Photostratigraphy is a new method of aerial photo interpretation which enables construction of a correlation framework based on remote sensing expression of geometry and physical characteristics of the strata. The photostratigraphic framework consists of specific surfaces and units, and has a relative chronostratigraphic sequence. The basis of the method, which allows rapid study of a basin, is presented and illustrated using examples from the Pyrenees.
931232 Hydraulic behaviour of rock joints through the infrared photo image analysis Tanimoto, C; Murai, S; Kiyama, H; Michihiro, K Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V1, P623-625. Publ Rotterdam: A A Balkema, 1991 Following a damaging slope failure along the Echizen Coast of Japan, the question of whether this and future instabilities could be predicted was raised. It was considered that the failure of the bedded rockmass could be attributed to water flow along regular joints associated with faults. Infrared photographic imaging allowed the fault and joint system to be clearly delineated, and the structure revealed has been verified by seismic and resistivity mapping. The relation between fault water content and climatic and hydrogeological conditions has been studied. 931233 Delineation and evaluation of rock types for construction material in an arduous terrain - a case study from Central India Nagarajan, R
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2981-2986. Pub/Rotterdam." A A Balkema, 1990 A study considering a remote area with rugged topography and poor communications is presented. To prepare a regional inventory of rock and soil materials for aggregates for developments in the area, use was made of previously obtained Landsat MSS and aerial photography data. Lithological units, soil cover, land use, and land cover were delineated. Field and laboratory examination of materials from promising areas was undertaken. Environmental constraints and consequences of working these deposits are considered.
Structural and geotechnical mapping 931234 Exploration of sand and gravel resources by geomorphological analysis in the glacial sediments of the Eastern Lleyn Peninsula, Gwynedd, North Wales Crimes, T P; Chester, D K; Thomas, G S P Engng Geol V32, N3, May 1992, P137-156 Geomorphological survey can be an economic and successful preliminary step in resource evaluation. A case study is presented in which an area of 165 sq km was surveyed in 50 man-days, on the basis of records of existing or disused pits,
© 1993 Pergamon Press Ltd. Reproduction not permitted
931228 Application of hemispherical-ended borehole technique to hot rock Obara, Y; Sugawara, K; Sakagushi, K; Mizuochi, Y Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V1, P587-590. Publ Rotterdam: A A Balkema, 1991 The hemispherical-ended borehole stress relief technique allows complete state of stress in a rock mass at a certain point to be evaluated from measurements in a single borehole. Its modification for use in hot rock, such that original rock stress can be determined independent of thermal stress, is described. A new spherical strain cell with 17 elements has been developed. Applications in a gold mine at temperatures of 50 and 80 deg C are illustrated. Results indicate this method to be effective in a homogeneous rock mass.
931229 Dynamic stress measurements using piezomagnetism Martin, R J; Noel, J S Proe 33rd US Symposium on Rock Mechanics, Santa Fe, 3-5 June 1992 P69-77. Publ Rotterdam: A A Balkema, 1992 Laboratory tests indicate a decrease in remanent magnetization of rock on loading, which becomes permanent on unloading, the drop being proportional to peak stress experienced. A field experiment was carried out to see if this effect could be used to measure peak stress as a function of distance from an underground chemical explosion. Cores of gabbro and diabase of known magnetic properties were grouted along the grouttuff interface of the access drift at the G Tunnel site, prior to a lton HE explosion. Post-detonation measurements and laboratory data were used to develop a peak stress-distance relation.
931230 Development of a piezomagnetic method to determine fanltrelated stress variations Narbutovskih, S M; Martin, R J; Greenfield, R J Proc 33rd US Symposium on Rock Mechanics, Santa Fe, 3-5 June 1992 P79-88. Publ Rotterdam: A A Balkema, 1992 Different techniques for estimating fault-related stress variations produce a wide range of results. A technique has been developed to enable continuous monitoring of current stress regime over an active fault in order to clarify the position. It is based on the stress dependency of rock piezomagnetic propertics. Measurements made across the Teal Creek fault in Amchitka Island in the Aleutian arc during the detonation of an underground nuclear explosion and laboratory data on basalt cores retrieved from over lkm depth nearby are presented. It is shown that the method is promising for continuous monitoring of tectonic stress levels.
Site Investigation and Field Observation See. 931504
Remote sensing and photographic techniques 931231 Criteria for stratigraphic correlation using aerial photographs: examples from the South-Central Pyrenees Sgavetti, M Bull Am Assoc Petrol Geoi V76, N5, May 1992, P708-730 Photostratigraphy is a new method of aerial photo interpretation which enables construction of a correlation framework based on remote sensing expression of geometry and physical characteristics of the strata. The photostratigraphic framework consists of specific surfaces and units, and has a relative chronostratigraphic sequence. The basis of the method, which allows rapid study of a basin, is presented and illustrated using examples from the Pyrenees.
931232 Hydraulic behaviour of rock joints through the infrared photo image analysis Tanimoto, C; Murai, S; Kiyama, H; Michihiro, K Proc 7th I S R M International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V1, P623-625. Publ Rotterdam: A A Balkema, 1991 Following a damaging slope failure along the Echizen Coast of Japan, the question of whether this and future instabilities could be predicted was raised. It was considered that the failure of the bedded rockmass could be attributed to water flow along regular joints associated with faults. Infrared photographic imaging allowed the fault and joint system to be clearly delineated, and the structure revealed has been verified by seismic and resistivity mapping. The relation between fault water content and climatic and hydrogeological conditions has been studied. 931233 Delineation and evaluation of rock types for construction material in an arduous terrain - a case study from Central India Nagarajan, R
Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2981-2986. Pub/Rotterdam." A A Balkema, 1990 A study considering a remote area with rugged topography and poor communications is presented. To prepare a regional inventory of rock and soil materials for aggregates for developments in the area, use was made of previously obtained Landsat MSS and aerial photography data. Lithological units, soil cover, land use, and land cover were delineated. Field and laboratory examination of materials from promising areas was undertaken. Environmental constraints and consequences of working these deposits are considered.
Structural and geotechnical mapping 931234 Exploration of sand and gravel resources by geomorphological analysis in the glacial sediments of the Eastern Lleyn Peninsula, Gwynedd, North Wales Crimes, T P; Chester, D K; Thomas, G S P Engng Geol V32, N3, May 1992, P137-156 Geomorphological survey can be an economic and successful preliminary step in resource evaluation. A case study is presented in which an area of 165 sq km was surveyed in 50 man-days, on the basis of records of existing or disused pits,
© 1993 Pergamon Press Ltd. Reproduction not permitted