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Application of laboratory measured cv to field problems
159A 933156 Evaluation of expansive clay soils in Tucson, Arizona Brooks, M W; Nowatzki, E A
Proc 6tk A S C E SpecialityConference on Probabilistic Meckanics and Structural and Geotechnical Reliability, Dower, 8-10 July 1992 P220-223. Publ New York: ASCE, 1992 The mineralogy, engineering properties, and distribution of expansive clay soils around Tucson have been examined. Information acquired was input to a database to facilitate geostatistical analysis and cartographic representation of the mineralogy and geotechnical properties in the form of contour plots. Geological and physiographic factors are seen to influence distribution of clay minerals. Statistical analysis was used to develop predictive equations to relate swell potential to common geotechnical parameters. Plasticity index provides the best predictor parameter. 933157 Time-settlement of a water supplying channel Germanov, T S; Dimitrov, N; Stantchev, B Proc lOth European Conference on Soil Mechanics and Fomalafon Engineering, Florence, 26-30 May 1991 V1, P413416. Publ Rotterdam: A A Balkema, 1991 Rapid construction of a water supply channel for a nuclear reactor in Bulgaria is described. The site profile contained irregular layers of soft silty clay, organic clay, sand, gravel, and stiff silty clay. Some layers are prone to liquefaction or collapse. To speed consolidation, gravel piles were installed and a 1.75m thick layer of gravel which forms the base for the channel was added. Predicted settlements for the construction and operational phases are compared to those measured. 933158 Effects of sample disturbance on strength and consolidation Shogaki, T Proc Ninth Asian Regional Conference on Soil Meclumics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P67-70. Publ Thailand." Southeast Asian Geotechnical Society, 1991 A procedure to correct measured undrained strength and consolidation parameters for sample disturbance is presented. The data used come from soft marine clay samples taken by several workers along a 1000m transect. Values of consolidation yield stress and coefficient of consolidation are affected by sample disturbance, and compression index becomes small as disturhance becomes large. Relations between consolidation parameters and degree of disturbance are given as a function of undrained strength and consolidation pressure. 933159 Application of laboratory measured cv to field problems Wong, K S; Choa, V Proc Nmtk Asian Regimmi Conference on Soil Mee~mies and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P99-102. Publ Thailand: Southeast Asian Geotechnical Society, 1991 When predicting field settlement rate using coefficient of consolidation obtained from conventional I-D oedometer tests, it is possible to make allowance for spatial variability of the soil, multidirectional drainage effects, test procedures and sampling disturbance. The observed settlement rate is still much faster than that predicted in the majority of cases. It is considered that this is associated with the validity of the one dimensional consolidation analysis in the method of determining coefficient of consolidation. The relative values of cv from several of the popular methods for its determination are examined. It is
shown that the method of Taylor (1984) together with a finite difference solution is a good predictor of field settlement. Three case studies are presented. 933160 Dispersive soils: a brief review and some South Mrlean experiences Bell, F G; Jermy, C A; Mortimer, B
Proc Nintk Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, 9-13 December 1991 VI, P129-132. Publ Thailand: Southeast Asian Geotechnical Society, 1991 Dispersive soils will deflocculate in the presence of relatively pure water to form colloidal solutions, and are susceptible to erosion and piping. The chemistry of dispersive soils is outlined and methods for their identification and testing described. Treatment for dispersive soils to enable their use in embankment construction is discussed. The distribution of dispersive soils in South Africa is illustrated and some case examples of projects where they were encountered are presented. 933161 Swelling behaviour of coal shales in response to temperature and humidity changes Huang, S L; Speck, R C; Wang, Z W
Proc 9th Annual Workskop Generic Mincral Technology Center Mine Systems Design and Ground Control, Lexbgton, 10-12 November, 1991 P59-68. Publ Blacksburg: Virginia Polytechnic Institute and State University, 1991 Laboratory tests on coal shales have previously shown that initial relative humidity and moisture susceptibility of the rock are the two important parameters in swelling. To extend this work for applications in cold regions, where segregation of pore water on freezing is possible, zero axial strain and free swell tests were carried out on 5 shales over the temperature range -10 to +23 deg C and humidity levels 0-100%. Correlations between swelling pressure and strain, air humidity, and sample temperature are illustrated. 933162 Improvement of very soft ground by vacuum consolidation using horizontal drllM Shinsha, H; Watari, Y; Kurumada, Y
Proc Intermuiomd Conference on Geoteeimieal Eqi~ering for Coastal Deoelopment, GEO.COAST'91, Yokakama, 3-6 September 1991 1'387-392. Publ Japan: Coastal Development Institute of Technology, 1991 A vacuum consolidation method using horizontal drains has been developed to speed dewatering and settlement of materials such as dredged deposits. Board drains are installed in the ground via a penetrating mandrel on a specially designed drain installation system. Multiple layers at intervals 0.5-1.5m are inserted. A vacuum pump is attached to one end of the drain, with a significant increase in dewatering yield being achieved. Two case examples of the application of the system are presented. Settlement histories, drainage rates, and resulting water content distributions are illustrated. 933163 Case study of Yertieal dlrmin ill ~d~immj~ ~ day Uehara, H; Hara, H; Kohagura, S; Yoshizawa, M; Taira, S
Proc lntemntlomd Comference om Geotedudcal F.~inceri~
for Co¢~d Development, GEO..COAST'91, Yok~ama, 3..6 September 1991 1'411-416. Publ Japan: Coastal Development Institute of Technology, 1991 Reclamation in the Nakagusuku Bay Harbour in Japan uses dredged deposits. Paper drains were installed in these deposits (90% silt and clay with immediate water content 150-300%)
© 1993 Pergamon Press Ltd. Reproduction not permitted
Proc 6tk A S C E SpecialityConference on Probabilistic Meckanics and Structural and Geotechnical Reliability, Dower, 8-10 July 1992 P220-223. Publ New York: ASCE, 1992 The mineralogy, engineering properties, and distribution of expansive clay soils around Tucson have been examined. Information acquired was input to a database to facilitate geostatistical analysis and cartographic representation of the mineralogy and geotechnical properties in the form of contour plots. Geological and physiographic factors are seen to influence distribution of clay minerals. Statistical analysis was used to develop predictive equations to relate swell potential to common geotechnical parameters. Plasticity index provides the best predictor parameter. 933157 Time-settlement of a water supplying channel Germanov, T S; Dimitrov, N; Stantchev, B Proc lOth European Conference on Soil Mechanics and Fomalafon Engineering, Florence, 26-30 May 1991 V1, P413416. Publ Rotterdam: A A Balkema, 1991 Rapid construction of a water supply channel for a nuclear reactor in Bulgaria is described. The site profile contained irregular layers of soft silty clay, organic clay, sand, gravel, and stiff silty clay. Some layers are prone to liquefaction or collapse. To speed consolidation, gravel piles were installed and a 1.75m thick layer of gravel which forms the base for the channel was added. Predicted settlements for the construction and operational phases are compared to those measured. 933158 Effects of sample disturbance on strength and consolidation Shogaki, T Proc Ninth Asian Regional Conference on Soil Meclumics and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P67-70. Publ Thailand." Southeast Asian Geotechnical Society, 1991 A procedure to correct measured undrained strength and consolidation parameters for sample disturbance is presented. The data used come from soft marine clay samples taken by several workers along a 1000m transect. Values of consolidation yield stress and coefficient of consolidation are affected by sample disturbance, and compression index becomes small as disturhance becomes large. Relations between consolidation parameters and degree of disturbance are given as a function of undrained strength and consolidation pressure. 933159 Application of laboratory measured cv to field problems Wong, K S; Choa, V Proc Nmtk Asian Regimmi Conference on Soil Mee~mies and Foundation Engineering, Bangkok, 9-13 December 1991 V1, P99-102. Publ Thailand: Southeast Asian Geotechnical Society, 1991 When predicting field settlement rate using coefficient of consolidation obtained from conventional I-D oedometer tests, it is possible to make allowance for spatial variability of the soil, multidirectional drainage effects, test procedures and sampling disturbance. The observed settlement rate is still much faster than that predicted in the majority of cases. It is considered that this is associated with the validity of the one dimensional consolidation analysis in the method of determining coefficient of consolidation. The relative values of cv from several of the popular methods for its determination are examined. It is
shown that the method of Taylor (1984) together with a finite difference solution is a good predictor of field settlement. Three case studies are presented. 933160 Dispersive soils: a brief review and some South Mrlean experiences Bell, F G; Jermy, C A; Mortimer, B
Proc Nintk Asian Regional Conference on Soil Mechanics and Foundation Engineering, Bangkok, 9-13 December 1991 VI, P129-132. Publ Thailand: Southeast Asian Geotechnical Society, 1991 Dispersive soils will deflocculate in the presence of relatively pure water to form colloidal solutions, and are susceptible to erosion and piping. The chemistry of dispersive soils is outlined and methods for their identification and testing described. Treatment for dispersive soils to enable their use in embankment construction is discussed. The distribution of dispersive soils in South Africa is illustrated and some case examples of projects where they were encountered are presented. 933161 Swelling behaviour of coal shales in response to temperature and humidity changes Huang, S L; Speck, R C; Wang, Z W
Proc 9th Annual Workskop Generic Mincral Technology Center Mine Systems Design and Ground Control, Lexbgton, 10-12 November, 1991 P59-68. Publ Blacksburg: Virginia Polytechnic Institute and State University, 1991 Laboratory tests on coal shales have previously shown that initial relative humidity and moisture susceptibility of the rock are the two important parameters in swelling. To extend this work for applications in cold regions, where segregation of pore water on freezing is possible, zero axial strain and free swell tests were carried out on 5 shales over the temperature range -10 to +23 deg C and humidity levels 0-100%. Correlations between swelling pressure and strain, air humidity, and sample temperature are illustrated. 933162 Improvement of very soft ground by vacuum consolidation using horizontal drllM Shinsha, H; Watari, Y; Kurumada, Y
Proc Intermuiomd Conference on Geoteeimieal Eqi~ering for Coastal Deoelopment, GEO.COAST'91, Yokakama, 3-6 September 1991 1'387-392. Publ Japan: Coastal Development Institute of Technology, 1991 A vacuum consolidation method using horizontal drains has been developed to speed dewatering and settlement of materials such as dredged deposits. Board drains are installed in the ground via a penetrating mandrel on a specially designed drain installation system. Multiple layers at intervals 0.5-1.5m are inserted. A vacuum pump is attached to one end of the drain, with a significant increase in dewatering yield being achieved. Two case examples of the application of the system are presented. Settlement histories, drainage rates, and resulting water content distributions are illustrated. 933163 Case study of Yertieal dlrmin ill ~d~immj~ ~ day Uehara, H; Hara, H; Kohagura, S; Yoshizawa, M; Taira, S
Proc lntemntlomd Comference om Geotedudcal F.~inceri~
for Co¢~d Development, GEO..COAST'91, Yok~ama, 3..6 September 1991 1'411-416. Publ Japan: Coastal Development Institute of Technology, 1991 Reclamation in the Nakagusuku Bay Harbour in Japan uses dredged deposits. Paper drains were installed in these deposits (90% silt and clay with immediate water content 150-300%)
© 1993 Pergamon Press Ltd. Reproduction not permitted