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Geostatistical investigations of rock masses: the Sierra del Medio case
240A use of Geoshare to reconstruct a superficial deposit stratigraphy from borehole data is demonstrated. Problems arising from non-standardisation of borehole logs, and possible solutions are discussed. 87619,1 Computer enhancement of Laadsat, magnetic, and other regional data O'Sullivan, K N
Proc 13th CMMI Conference: Geology and Exploration, Singapore, 11-16 May 1986 V2, P1-10. Publ Parkville: CMMI. 1986 Techniques originally developed to process digital images of Mars and applied to Landsat data are now being used to process geological data outside remote sensing. The various forms the data can take are described, and processing and image enhancement techniques such as contrast stretching, principal component analysis, spatial filtering, data integration and merging presented. Examples are shown where information from remote sensing is successfully combined with that from topographic, geophysical, geochemical and geological mapping. 876195 ~atistical Sahin, A
evaluation of a beach sand mille deposit
Proc 13th CMMI Conference: Geology and Exploration, Singac~e, 11-16 May 1986 V2, P21-25. Pubi Parkville: CMMI. 1986 A geostatistical study on futile grade and clay content from a beach sand deposit is described. Geostatistical analysis using scmivariogram modelling and kriging, plus considerations of acceptable impurity level and cut off grade for ore were used to optimise mineable thickness and tonnage extraction. 876196 Geostatistics in the stratigraphi¢ orebodies at Mount lsa Dowd, P A; Scott, I R
Proe 13th CMM! Conference: Geology and Exploration, Siqapore, 11-16 May 1986 I/2. P27-36. Publ Parkville." CMMI, 1986 Statistical and geostatistical techniques for mine planning in stratigraphic orebodies are presented and illustrated for Mount Isa Mine, Australia. Solutions are given for calculating variograms in orebodies of variable dip, strike and plunge, together with relative variograrns for individual metals, metal accumulation and orebody thickness. Optimum methods for hangingwall and footwall location are introduced. Boundary estimates are compared with manually interpreted boundaries and known boundaries.
876198 Geomodel: a geological database for coal prospecting and site evaluation Knight. J L
Proc Symposium on Computer Applications in Geotechrdcal Engineering, Birmingham, April 1986 P59-66. Publ Birmingham." 2~[idlands Geotechnical Societr /986 The Geomodel database was developed to model the structure of coal deposits and overburden and to increase the speed of open pit mine design while lowering exploration costs. Input data is from geophysical logs of exploration boreholes and laboratory testing of cores. Design. development, operation. and output of the database are described. 876199 Spatial analysis of fracture orientations Young, D S; Hoerger, S F
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2. Pl111-1121. Pubt Oxford: Pergamon Press. 1986 Geostatistlcs was introduced successfully in the spatial analysis of fracture orientations and the construction of geotechnical models. The spatial variability of fracture orientations or random vectors was analysed through the vectorial variogram, and the kriging technique was employed to estimate the local average attitude of orientations within a unit block to construct a structural model based on sparse sample data. The geostatistical technique was cross-validated through an open pit modelling case where the efficiency and capability of kriging as well as geostatistics in general was demonstrated excellently. Auth. 876200 Geostatistical investigations of rock masses: the Sierra del Medio ease Matar, J A; Matar de Sarquis, M A; Giradi, J P: Tabbia, G H
Proc 5th International Congress InternatiOnal Assodation of Engineering Geology, kenos Aires, 20-25 October 1986 Vt. P47-52. Publ Rotterdam: A A Balkema, 1986 Geological discontinuities are of great importance to rock mass behaviour. Complete geological mapping is expensive, time consuming, and extremely difficult in many cases, and geostatistical techniques are often used to predict structures from limited site data. The method used to predict the least fractured areas of the Sierra del Medio from surface measurements of number of joints per linear metre and index of surface rock quality are presented. Collection of data to determine the final grid, sampling and analysis are described. Core drilling confirmed predictions.
Monitoring rock and soil mass performance See also: 876420
876197 ~re:
the ~ a t i o n
m m a ~ a o u of p
~
of i ~ ~
t
/
~
technology to the
~
- E
Wood, L A; Tucker, E V; Hayes, A J; W ~ n ~ g h t , 19
Proc Symposium o n Comlmter A.~ic.sutions in GeoteetmiCal Eagineering, Biemingkam, April 1 ~ P45'58. Publ Birmingham: Midlands Geotechnicat Society, 1986 The database GEOSHARE has been dmc¢lopcd as a comprehensive data management tool f o r site investigation data. Hardware, software, and data input, retrieval and output are described. Output can be in the form of strata description in listings, maps or three dimensional graphics, descriptions of a specific reduced level, or parameter details.
876201 Low cost eie~rotytic tiltmeter for measuring slope deformation. Tedmleal note Xinbao Zhang
Geotech Test J VIO, N2, June 1987, P91-94 A tiltmeter is described which consists of a glass jar containing an electrolyte and six electrodes and a conductivity meter which records changes in conductivity due to tilting deflections. It has a sensitivity of 2-8 minutes of arc/conductivity meter unit and a range of more than 45 deg. tt is simple to read and install and has been used to measureearthflow subsurface movements in New Zealand.
© 1987 Pergamon Journals Ltd. Reproduction not permitted
Proc 13th CMMI Conference: Geology and Exploration, Singapore, 11-16 May 1986 V2, P1-10. Publ Parkville: CMMI. 1986 Techniques originally developed to process digital images of Mars and applied to Landsat data are now being used to process geological data outside remote sensing. The various forms the data can take are described, and processing and image enhancement techniques such as contrast stretching, principal component analysis, spatial filtering, data integration and merging presented. Examples are shown where information from remote sensing is successfully combined with that from topographic, geophysical, geochemical and geological mapping. 876195 ~atistical Sahin, A
evaluation of a beach sand mille deposit
Proc 13th CMMI Conference: Geology and Exploration, Singac~e, 11-16 May 1986 V2, P21-25. Pubi Parkville: CMMI. 1986 A geostatistical study on futile grade and clay content from a beach sand deposit is described. Geostatistical analysis using scmivariogram modelling and kriging, plus considerations of acceptable impurity level and cut off grade for ore were used to optimise mineable thickness and tonnage extraction. 876196 Geostatistics in the stratigraphi¢ orebodies at Mount lsa Dowd, P A; Scott, I R
Proe 13th CMM! Conference: Geology and Exploration, Siqapore, 11-16 May 1986 I/2. P27-36. Publ Parkville." CMMI, 1986 Statistical and geostatistical techniques for mine planning in stratigraphic orebodies are presented and illustrated for Mount Isa Mine, Australia. Solutions are given for calculating variograms in orebodies of variable dip, strike and plunge, together with relative variograrns for individual metals, metal accumulation and orebody thickness. Optimum methods for hangingwall and footwall location are introduced. Boundary estimates are compared with manually interpreted boundaries and known boundaries.
876198 Geomodel: a geological database for coal prospecting and site evaluation Knight. J L
Proc Symposium on Computer Applications in Geotechrdcal Engineering, Birmingham, April 1986 P59-66. Publ Birmingham." 2~[idlands Geotechnical Societr /986 The Geomodel database was developed to model the structure of coal deposits and overburden and to increase the speed of open pit mine design while lowering exploration costs. Input data is from geophysical logs of exploration boreholes and laboratory testing of cores. Design. development, operation. and output of the database are described. 876199 Spatial analysis of fracture orientations Young, D S; Hoerger, S F
Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August 1986 V2. Pl111-1121. Pubt Oxford: Pergamon Press. 1986 Geostatistlcs was introduced successfully in the spatial analysis of fracture orientations and the construction of geotechnical models. The spatial variability of fracture orientations or random vectors was analysed through the vectorial variogram, and the kriging technique was employed to estimate the local average attitude of orientations within a unit block to construct a structural model based on sparse sample data. The geostatistical technique was cross-validated through an open pit modelling case where the efficiency and capability of kriging as well as geostatistics in general was demonstrated excellently. Auth. 876200 Geostatistical investigations of rock masses: the Sierra del Medio ease Matar, J A; Matar de Sarquis, M A; Giradi, J P: Tabbia, G H
Proc 5th International Congress InternatiOnal Assodation of Engineering Geology, kenos Aires, 20-25 October 1986 Vt. P47-52. Publ Rotterdam: A A Balkema, 1986 Geological discontinuities are of great importance to rock mass behaviour. Complete geological mapping is expensive, time consuming, and extremely difficult in many cases, and geostatistical techniques are often used to predict structures from limited site data. The method used to predict the least fractured areas of the Sierra del Medio from surface measurements of number of joints per linear metre and index of surface rock quality are presented. Collection of data to determine the final grid, sampling and analysis are described. Core drilling confirmed predictions.
Monitoring rock and soil mass performance See also: 876420
876197 ~re:
the ~ a t i o n
m m a ~ a o u of p
~
of i ~ ~
t
/
~
technology to the
~
- E
Wood, L A; Tucker, E V; Hayes, A J; W ~ n ~ g h t , 19
Proc Symposium o n Comlmter A.~ic.sutions in GeoteetmiCal Eagineering, Biemingkam, April 1 ~ P45'58. Publ Birmingham: Midlands Geotechnicat Society, 1986 The database GEOSHARE has been dmc¢lopcd as a comprehensive data management tool f o r site investigation data. Hardware, software, and data input, retrieval and output are described. Output can be in the form of strata description in listings, maps or three dimensional graphics, descriptions of a specific reduced level, or parameter details.
876201 Low cost eie~rotytic tiltmeter for measuring slope deformation. Tedmleal note Xinbao Zhang
Geotech Test J VIO, N2, June 1987, P91-94 A tiltmeter is described which consists of a glass jar containing an electrolyte and six electrodes and a conductivity meter which records changes in conductivity due to tilting deflections. It has a sensitivity of 2-8 minutes of arc/conductivity meter unit and a range of more than 45 deg. tt is simple to read and install and has been used to measureearthflow subsurface movements in New Zealand.
© 1987 Pergamon Journals Ltd. Reproduction not permitted