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Predicting in-situ rock fracture parameters using Bayesian (soft) kriging
24A 901183 Study of the variation in strength parameters prior to slope analysis Sah, N K; Singh, V K; Baliga, B D Min Sci Teclmol V9, NI, July 1989, P19-22 Before rock slope analysis is carried out, it is desireable to determine the degree of heterogeneity of the rock as slope height varies. A new approach for this is presented, based on the statistical analysis of variance technique for one way classifications. It is illustrated using the example of compressive, tensile and shear strengths from an open pit limestone mine.
901184 Approach to wide-runging correlation of fracture distributions using the concept of fructal Kojima, K; Tosaka, H; Ohno, H Rock Meelumics as a Guide for Efficient Utilization of Natural Resources: Proe 30th U.S. Symposium, Morgantown, 19-22 June 1989 P211-218. Publ Rotterdam: A A Balkema, 1989 Fracture traces from geological and fault maps, aerial photographs, and sketches from 4 regions of Japan have been studied and it is indicated that fractal geometry exists in the fracture traces. This knowledge can be used to estimate fracture distributions at any observation scale from measurements at the available scale, which can assist when modelling flow or mechanical response of fractured rock masses.
901185 Bayesian analysis method for incorporating expert opinion and off-site data into rock mechanics studies Lundquist, R; Fraser, J; Ross-Brown, D Rock Meclmnics as a Guide for Efficient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P219-226. Publ Rotterdam: A ,4 Balkema, 1989 A method to incorporate expert opinion and off-site data into rock mechanics analysis has been developed using Bayesian theory. Performance predictions require a distribution of the parameter and a level of confidence in that distribution. Five methods to obtain these 2 levels of description are presented. The method is applied to the distribution of 5 properties of salt.
901186 Predicting in-situ rock fracture parameters using Bayesian (soft) kriging Kim, Y C; Cervantes, J A; Farmer, I W Proe 6th Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Fairbanks, 31 July-2 August 1988 P165-180. Publ Blacksburg: Virginia Polytechnic Institute and State UniL'ersity, 1988 Three rock fracture parameters, RQD, longest piece of intact rock, and % of + ! inch length, define three points along empirical cumulative size distribution curves. The curves are used for a variety of engineering applications in open pit mining. These parameters have been estimated for 2 dominant rock types, porphyry and schist, at the Inspiration copper mine, Arizona, using ordinary kriging with measured hard data only, and Bayesian kriging using hard and soft data. Cross validation of 100 measured sample values illustrates the benefits of the second approach.
Monitoring rock and soil mass performance 901187 Monitoring equipment for mining induced stresses at Niobec Mine Herget, G; Kapeller, F CIM Bull 1/82, N927, July 1989. P61-64 The CANMET Mining Research Laboratories strain monitoring system uses vibrating wire instrumentation to monitor deformation in relatively large boreholes (76-153mm diameter). The vibrating wire is strung across a proving ring and operates at a frequency of 600-1800Hz. The ring is installed using a hydraulic tool and brought into contact with the surrounding rock through precisely machined and guided wedges. Its use to monitor effects of drill drift development and stope mining on surrounding ground stresses is described.
901188 Prediction of roof conditions and support efficacy through instrumentation - some studies Ghosh, C N; Venkateswarlu, V; gaju, N M J Min Metal Fuels 1/36, NIO, Oct 1988, P456-462 Roof falls in coal mines generally occur due to the presence of thinly layered shales, clay or thin coal bands, or geological discontinuities. Support and support density selected on experience alone may lead to over- or under-specification. Observational study of strata behaviour, measurement of support pressure, convergence and roof strata deformation, as a basis for support design specification is described. Instrumentation used and its layout for case histories, monitored results, and their application are presented.
901189 Compaction monitoring in the Ekofisk area chalk fields Menghini, M L J Pet Teclmol 1/41. N7. July 1989, P735-739 Initial time lapse surveys of magnitude and areal extent of Ekofisk subsidence used cased hole neutron tools, but did not provide sufficient accuracy. Subsequently, additional radioactive markers and a gamma ray detection tool were used to improve accuracy and check overburden compaction. 13 wells are currently instrumented. Monitoring accuracy is dependent on wellbore geometry, completion design and radioactive marker placement. Results to date and operational and analytical procedures are presented.
901190 Development and installation of an underwater three dimensional fissurometer Popiel, M J; Cote, J G; Capeile, J F; Ruelokke, M Proc 2nd International Symposium on Field Measurements in Geomcclmsics, Kob¢, 6-9 April 1987 VI, P249-2S4. Pub/ Rotterdam: A A Balkema, 1988 A triaxial fissurometer has been designed to monitor movement of a crack in a dam face on 3 perpendicular planes. The fissurometer comprises a target, an anchorage plate and 3 sensors. Development, installation and testing of the instrument are described.
© 1990 Pergamon Press plc. Reproduction not permitted
901184 Approach to wide-runging correlation of fracture distributions using the concept of fructal Kojima, K; Tosaka, H; Ohno, H Rock Meelumics as a Guide for Efficient Utilization of Natural Resources: Proe 30th U.S. Symposium, Morgantown, 19-22 June 1989 P211-218. Publ Rotterdam: A A Balkema, 1989 Fracture traces from geological and fault maps, aerial photographs, and sketches from 4 regions of Japan have been studied and it is indicated that fractal geometry exists in the fracture traces. This knowledge can be used to estimate fracture distributions at any observation scale from measurements at the available scale, which can assist when modelling flow or mechanical response of fractured rock masses.
901185 Bayesian analysis method for incorporating expert opinion and off-site data into rock mechanics studies Lundquist, R; Fraser, J; Ross-Brown, D Rock Meclmnics as a Guide for Efficient Utilization of Natural Resources: Proc 30th U.S. Symposium, Morgantown, 19-22 June 1989 P219-226. Publ Rotterdam: A ,4 Balkema, 1989 A method to incorporate expert opinion and off-site data into rock mechanics analysis has been developed using Bayesian theory. Performance predictions require a distribution of the parameter and a level of confidence in that distribution. Five methods to obtain these 2 levels of description are presented. The method is applied to the distribution of 5 properties of salt.
901186 Predicting in-situ rock fracture parameters using Bayesian (soft) kriging Kim, Y C; Cervantes, J A; Farmer, I W Proe 6th Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Fairbanks, 31 July-2 August 1988 P165-180. Publ Blacksburg: Virginia Polytechnic Institute and State UniL'ersity, 1988 Three rock fracture parameters, RQD, longest piece of intact rock, and % of + ! inch length, define three points along empirical cumulative size distribution curves. The curves are used for a variety of engineering applications in open pit mining. These parameters have been estimated for 2 dominant rock types, porphyry and schist, at the Inspiration copper mine, Arizona, using ordinary kriging with measured hard data only, and Bayesian kriging using hard and soft data. Cross validation of 100 measured sample values illustrates the benefits of the second approach.
Monitoring rock and soil mass performance 901187 Monitoring equipment for mining induced stresses at Niobec Mine Herget, G; Kapeller, F CIM Bull 1/82, N927, July 1989. P61-64 The CANMET Mining Research Laboratories strain monitoring system uses vibrating wire instrumentation to monitor deformation in relatively large boreholes (76-153mm diameter). The vibrating wire is strung across a proving ring and operates at a frequency of 600-1800Hz. The ring is installed using a hydraulic tool and brought into contact with the surrounding rock through precisely machined and guided wedges. Its use to monitor effects of drill drift development and stope mining on surrounding ground stresses is described.
901188 Prediction of roof conditions and support efficacy through instrumentation - some studies Ghosh, C N; Venkateswarlu, V; gaju, N M J Min Metal Fuels 1/36, NIO, Oct 1988, P456-462 Roof falls in coal mines generally occur due to the presence of thinly layered shales, clay or thin coal bands, or geological discontinuities. Support and support density selected on experience alone may lead to over- or under-specification. Observational study of strata behaviour, measurement of support pressure, convergence and roof strata deformation, as a basis for support design specification is described. Instrumentation used and its layout for case histories, monitored results, and their application are presented.
901189 Compaction monitoring in the Ekofisk area chalk fields Menghini, M L J Pet Teclmol 1/41. N7. July 1989, P735-739 Initial time lapse surveys of magnitude and areal extent of Ekofisk subsidence used cased hole neutron tools, but did not provide sufficient accuracy. Subsequently, additional radioactive markers and a gamma ray detection tool were used to improve accuracy and check overburden compaction. 13 wells are currently instrumented. Monitoring accuracy is dependent on wellbore geometry, completion design and radioactive marker placement. Results to date and operational and analytical procedures are presented.
901190 Development and installation of an underwater three dimensional fissurometer Popiel, M J; Cote, J G; Capeile, J F; Ruelokke, M Proc 2nd International Symposium on Field Measurements in Geomcclmsics, Kob¢, 6-9 April 1987 VI, P249-2S4. Pub/ Rotterdam: A A Balkema, 1988 A triaxial fissurometer has been designed to monitor movement of a crack in a dam face on 3 perpendicular planes. The fissurometer comprises a target, an anchorage plate and 3 sensors. Development, installation and testing of the instrument are described.
© 1990 Pergamon Press plc. Reproduction not permitted