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Use of neural networks in the analysis and interpretation of site investigation data
SITE INVESTIGATIONS:TESTING
199A
944215 Quelques exploitations statistiques d ' u n tickler informatique de mouvements de terrain (Statistical approach of a computer data base on soil and rock failures) E. Gervreau & J.-L. Durville, Bulletin - International Association of Engineering Geology, 48, 1993, pp 33-42. A French computer data base on soil and rock failures has been recently developed and some results obtained from the data are presented: frequency of different types, spatial and temporal distribution, statistical data about victims, various causes of occurrence, types of technical solutions used, etc. The influence of the present samplln~g bias is discussed. -Enghsh summary
A new method of recording and presenting key geotcchnical parameters, including the data requited for rock mass classification purposes, is highlighted through geotechnical logging work performed during the benching operations in the underground powerhouse at Sardar Sarovar (S-S) project in Gujarat, India, and at the site of Norway's underground olympic stadium. The geotechnical data at the two project sites has been recorded and systematized on logging charts displaying histograms. The logged geotecimical data is subsequently punched into a PC-based spreadsheet (Lotus) thus allowing the data to be combined or manipulated according to the user's wishes. These parameters are a key to the process of rock mass behaviour prediction. -from Author
944216 The collection and analysis of discontinuity orientation data for engineering design, with examples S . D . Priest, in: Comprehensive rock engineering. Vol. 3, ed I.A. Hudson, (Pergamon), 1993, pp 167-192. The first part of the chapter deals with discontinuity sampiing methods, and the graphical and vectorial representation of orientation data. A new Turbo Pascal computer program CANDO, based on the methods explained for rapid analysis of large volumes of discontinuity orientation data is presented. One of the main features of this chapter is the use of examples to illustrate the data processing methods. The aim of these examples is to illustrate princ.iples rather than to simulate an actual data processing exercxse. -from Author
944221 Field application of a method for interpretation of horizontal-well transient tests P.C. Shah, D.K. Gupta, L. Singh & B. G. Demyck, SPE Formation Evaluation, 9(1), 1994, pp 23-31. In a multitransient test in the Bombay High field offshore India, simultaneous measurement of downhole pressure and flow rate enables identification of early- and l-ate-time pseudoradial-flow regimes and intermediate linear flow. Analysis of these successive flow regimes yields estimates of the anisotropic formation permeahilities and the mechanical skin factor. An algorithm is presented to compute the well rate from transient pressure, given the characteristic response model of the single-wen system. -Authors
944217 Use of neural networks in the analysis and interpretation of site investigation data Yingxin Zhou & Xiping Wu, Computers & Geotechnics, 16(2), 1994, pp 105-122. Results f ~ m the neural network model compare very well with similar contour maps generated using kxiging techniques. The main advantage of this neural network based approach is its ability in establishing patterns or relationships through training directly on the data without building any complicated mathematical models and making assumptions on spatial variations. -Authors 944218 Ambiguity analysis of well-log data A. Bueno Buoro & J. B. C. Silva, Geophysics, 59(3), 1994, pp 336-344. The ambiguity in the inversion of well-logging data was studied using a method based on the analysis of a finite number of acceptable solutions, which are ordered, in the solution space, according to their contributions to the overall amoiguity. The analysis of the parameter variations along these ordered solutions provides an objective way to characterize the most ambiguous parameters. The analysis was performed with recorded data, and compared with the analysis using singular value decomposition, leading to comparable results. Following the determination of the most ambiguous parameters, a reparameterization is possible by grouping these parameters into a single parameter leading to a simpler interpretation model and, therefore, to a drastic reduction in the ambiguity. -from Authors 944219 The potential use of geotechnical information systems in the planning of tunnels for Amsterdam P. M. Maurenbrecher & J. Herbschleb, Tunnelling & Underground Space Technology, 9(2), 1994, pp 189-199. A pilot study was initiated in 1986 to produce an engineering geological information system for a 4-kin 2 area of the west-central district of Amsterdam. The information system contained cone penetration profile data, as well as information on boreho-les and groundwater levels. The system has been shown to work using standard database and mapping programmes to produce thematic maps which can be used in tunnel plann~g and design. Reference is made the proposed north-south underground light-railway line zor Amsterdam to provide planning examples for which such an information system would be of relevance. -from Authors 944220 Rock mass characterization for large caverns in India and Norway using a new method o f recording a n d p r e s e n t i n g engineering geological data R. Bhasin, International Journal of Rock Mechanics & Mining Sciences, 31(1), 1994, pp 87-91.
Suggested testing methods and standards 944222 Stress-cracking resistance of high.density polyethylene geomembranes Y . G . Hsuan,R. M. Koemer & A. E. Lord Jr, Journal of Geotechnical Engineering - ASCE, 119(11), 1993, pp 1840-1855. A new index test method, the notched constant tensile load (NCTL) test, for evaluating high-density polyethylene (HDPE) geomembranes regarding stress-cracking resistance is presented in this paper. A comparison between the results of the NCTL test and the currently used ASTM D 1693 bent-strip test was conducted. It indicates that the bent-strip test cannot adequately evaluate stress cracking resistance, and that the NCTL test is a more critical test in the assessment of such behavior. -from Authors 944223 Analisis critico de modelos de prediccion de la erosion hidrica en mineria y obra civil (Critical analysis of erosion prediction models in mining and civil work) J. C. Arranz Gonzalez, J. Almorox Alonso & R. Antonio Garcia, Boletin Geologico y Minero, 104(4), 1993, pp 422-430. This paper analyzes the erosion models that can be applied in mining, and civil engineeringprojects. It emphasizes the applicability and limitations o f USLE (Universal Soil Loss Equation) model, discussing each parameter. As a conclusion, it underlines the need for further investigation to adjust the USLE factors to the local conditions and m the materials normally exposed in these kinds of works. -English summary
944224 Improvement of methods of evaluating the deformation properties of soft soils in the base of structures and in embankments E. K. Kuzakhmetova, Soil Mechanics & Founda~on Engineering, 30(5), 1994, ~pp. 189-192; translated from: Osnovaniya, Fundamenty z Mekhanika Gruntov, 30(5), 1993, pp 5-7. The need to reconsider existing procedures for tests of soft peat and clay soils used in bases and in structures themselves to evaluate their deformation properties stems from me ract that these procedures' theoreucal p.rinciples are mainly based on the mechanics of stable soils and do not take into account the specific behavior of soft soils. This leads to design errors. Refined testing procedures should be based on modem theoretical developments that take into account peculiarities of the static compaction of soft soils with undisturbed or disturbed structure, resulting
199A
944215 Quelques exploitations statistiques d ' u n tickler informatique de mouvements de terrain (Statistical approach of a computer data base on soil and rock failures) E. Gervreau & J.-L. Durville, Bulletin - International Association of Engineering Geology, 48, 1993, pp 33-42. A French computer data base on soil and rock failures has been recently developed and some results obtained from the data are presented: frequency of different types, spatial and temporal distribution, statistical data about victims, various causes of occurrence, types of technical solutions used, etc. The influence of the present samplln~g bias is discussed. -Enghsh summary
A new method of recording and presenting key geotcchnical parameters, including the data requited for rock mass classification purposes, is highlighted through geotechnical logging work performed during the benching operations in the underground powerhouse at Sardar Sarovar (S-S) project in Gujarat, India, and at the site of Norway's underground olympic stadium. The geotechnical data at the two project sites has been recorded and systematized on logging charts displaying histograms. The logged geotecimical data is subsequently punched into a PC-based spreadsheet (Lotus) thus allowing the data to be combined or manipulated according to the user's wishes. These parameters are a key to the process of rock mass behaviour prediction. -from Author
944216 The collection and analysis of discontinuity orientation data for engineering design, with examples S . D . Priest, in: Comprehensive rock engineering. Vol. 3, ed I.A. Hudson, (Pergamon), 1993, pp 167-192. The first part of the chapter deals with discontinuity sampiing methods, and the graphical and vectorial representation of orientation data. A new Turbo Pascal computer program CANDO, based on the methods explained for rapid analysis of large volumes of discontinuity orientation data is presented. One of the main features of this chapter is the use of examples to illustrate the data processing methods. The aim of these examples is to illustrate princ.iples rather than to simulate an actual data processing exercxse. -from Author
944221 Field application of a method for interpretation of horizontal-well transient tests P.C. Shah, D.K. Gupta, L. Singh & B. G. Demyck, SPE Formation Evaluation, 9(1), 1994, pp 23-31. In a multitransient test in the Bombay High field offshore India, simultaneous measurement of downhole pressure and flow rate enables identification of early- and l-ate-time pseudoradial-flow regimes and intermediate linear flow. Analysis of these successive flow regimes yields estimates of the anisotropic formation permeahilities and the mechanical skin factor. An algorithm is presented to compute the well rate from transient pressure, given the characteristic response model of the single-wen system. -Authors
944217 Use of neural networks in the analysis and interpretation of site investigation data Yingxin Zhou & Xiping Wu, Computers & Geotechnics, 16(2), 1994, pp 105-122. Results f ~ m the neural network model compare very well with similar contour maps generated using kxiging techniques. The main advantage of this neural network based approach is its ability in establishing patterns or relationships through training directly on the data without building any complicated mathematical models and making assumptions on spatial variations. -Authors 944218 Ambiguity analysis of well-log data A. Bueno Buoro & J. B. C. Silva, Geophysics, 59(3), 1994, pp 336-344. The ambiguity in the inversion of well-logging data was studied using a method based on the analysis of a finite number of acceptable solutions, which are ordered, in the solution space, according to their contributions to the overall amoiguity. The analysis of the parameter variations along these ordered solutions provides an objective way to characterize the most ambiguous parameters. The analysis was performed with recorded data, and compared with the analysis using singular value decomposition, leading to comparable results. Following the determination of the most ambiguous parameters, a reparameterization is possible by grouping these parameters into a single parameter leading to a simpler interpretation model and, therefore, to a drastic reduction in the ambiguity. -from Authors 944219 The potential use of geotechnical information systems in the planning of tunnels for Amsterdam P. M. Maurenbrecher & J. Herbschleb, Tunnelling & Underground Space Technology, 9(2), 1994, pp 189-199. A pilot study was initiated in 1986 to produce an engineering geological information system for a 4-kin 2 area of the west-central district of Amsterdam. The information system contained cone penetration profile data, as well as information on boreho-les and groundwater levels. The system has been shown to work using standard database and mapping programmes to produce thematic maps which can be used in tunnel plann~g and design. Reference is made the proposed north-south underground light-railway line zor Amsterdam to provide planning examples for which such an information system would be of relevance. -from Authors 944220 Rock mass characterization for large caverns in India and Norway using a new method o f recording a n d p r e s e n t i n g engineering geological data R. Bhasin, International Journal of Rock Mechanics & Mining Sciences, 31(1), 1994, pp 87-91.
Suggested testing methods and standards 944222 Stress-cracking resistance of high.density polyethylene geomembranes Y . G . Hsuan,R. M. Koemer & A. E. Lord Jr, Journal of Geotechnical Engineering - ASCE, 119(11), 1993, pp 1840-1855. A new index test method, the notched constant tensile load (NCTL) test, for evaluating high-density polyethylene (HDPE) geomembranes regarding stress-cracking resistance is presented in this paper. A comparison between the results of the NCTL test and the currently used ASTM D 1693 bent-strip test was conducted. It indicates that the bent-strip test cannot adequately evaluate stress cracking resistance, and that the NCTL test is a more critical test in the assessment of such behavior. -from Authors 944223 Analisis critico de modelos de prediccion de la erosion hidrica en mineria y obra civil (Critical analysis of erosion prediction models in mining and civil work) J. C. Arranz Gonzalez, J. Almorox Alonso & R. Antonio Garcia, Boletin Geologico y Minero, 104(4), 1993, pp 422-430. This paper analyzes the erosion models that can be applied in mining, and civil engineeringprojects. It emphasizes the applicability and limitations o f USLE (Universal Soil Loss Equation) model, discussing each parameter. As a conclusion, it underlines the need for further investigation to adjust the USLE factors to the local conditions and m the materials normally exposed in these kinds of works. -English summary
944224 Improvement of methods of evaluating the deformation properties of soft soils in the base of structures and in embankments E. K. Kuzakhmetova, Soil Mechanics & Founda~on Engineering, 30(5), 1994, ~pp. 189-192; translated from: Osnovaniya, Fundamenty z Mekhanika Gruntov, 30(5), 1993, pp 5-7. The need to reconsider existing procedures for tests of soft peat and clay soils used in bases and in structures themselves to evaluate their deformation properties stems from me ract that these procedures' theoreucal p.rinciples are mainly based on the mechanics of stable soils and do not take into account the specific behavior of soft soils. This leads to design errors. Refined testing procedures should be based on modem theoretical developments that take into account peculiarities of the static compaction of soft soils with undisturbed or disturbed structure, resulting