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Water content-density criteria for compacted soil liners
222A 914182 Water content-density criteria for compacted soil liners Daniel, D E; Benson, C H J Geotech Engng Div ASCE V116, NI2, Dec 1990, P18111832
914186 Collapsible-soil compaction by 80-ton mass rammer Ilichev, V A; Bagdasarov, Y A; Bytsutenko, O V; Gaidukov, A N Soil Mech Found Engng V27, N2. March-April 1990, P62-65
Soil liners have traditionally been compacted to a field minimum dry weight over a specified range of water content, a practice developed for structural fills, where strength and compressibility are the premier design criteria, rather than hydraulic conductivity. An alternative approach is suggested, based on defining water content-density requirements for a broad range of compactive effect, and relating these requirements to liner design parameters. A case example is described. Hydraulic conductivity measured on three soils was used to develop an acceptable zone for the compaction curve for use in construction quality control. Construction times are reduced if this approach is adopted.
In order to increase the thickness of the compacted bed and to investigate vibration propagation (for damage/safety distance estimation) and compacted depth, trials were carried out using a 4m square rammer of 80ton mass, dropped from heights 26.8m. Results indicate that the proportion of energy transmitted as elastic vibration rather than used for plastic deformation of the soil is greater as the drop height decreases. The 80 ton rammer allows very rapid site preparation, but cost factors favour the use of rammers of lower mass. 914187 Improving the reliability of determination of the compression modulus of silty-clayey soils from the results of compression tests
914183 Modeling one-dimensional compression characteristics of soils. Technical note Liu, J C; Znidarcic, D J Geoteeh Engng Div ASCE VII7, NI, Jan 1991, P162-169 A new extended power-function model and that of Hardin (1989) are compared as to their ability to replicate experimental and previously published data on one dimensional compression of soils. A wide variety of soils was considered, but the emphasis is on softer materials. Both models have similar predictive capability, but that of Hardin is more suitable for sensitive clays. Considerable experimental effort is needed to obtain the three parameters required by the new model.
914184 Continuous loading oedometer testing of soils Davison, L R; Atkinson, J H Q J Engng Geoi V23, N4, 1990. P347-355 The conventional step loading oedometer test (BS 1377:1975) provides relatively little data on compression and consolidation parameters of the soil or on its preconsolidation or yield pressure. Continuous loading tests overcome these drawbacks, and can be routinely carried out using data logging and control systems originally developed for stress path testing systems. Tests on reconstituted soils indicate that measured parameters do not depend significantly on type of test.
914185 Results of observations on settlements of filled-up bases in Yakutsk Roman, L T; lgnatova, G M; Tseeva, A N; Egorov, G E Soil Mech Found Engng V27, NI, Jan-Feb 1990, P6-11 Developments around Yakutsk will be on areas prepared with hydraulic fill. Fill placement has led to thawing and saturation of the top layer of permafrost, leading to settlement of the soil base. Measurement of soil temperature, water content, thawing boundary depth, and settlement were made during fill placement and subsequent construction of foundations. Limiting calculated settlements and field data are compared. Observed movements are greater than predictions, but because there is no differential settlement, no structural damage has occurred. ~
Gurvich, E V; Dorokhova, L N; Mariupolskii, L G Soil Mech Found Engng V27, N2, March-April 1990, P78-80 It is not always possible to carry out plate loading tests to determine in situ the compressibility of a soil mass for foundation design calculations, and results of laboratory oedometer tests are substituted. Results are presented of a regression analysis to investigate the correlation of plate load and oedometer moduli over a range of applied pressures and which includes the effects of moisture content, porosity, and plasticity index on the compressibility of silty-clayey soils. 914188 Dilatometer for determination of the compression modulus of soils under field conditions Blekhman, D A; Labzov, Y V; Nikolaev, V B; Pyarnpuu, Z K; Mariupolskii, L G; Trofimenkov, Y G Soil Mech Found Engng V27, N2, March-April 1990. P81-86 Soil compressibility is a vital parameter for foundation design calculations. Of the many field and laboratory methods for its determination, the plate loading test is generally considered the most reliable. It is however time consuming and sometimes impractical. A dilatometer, similar to that of Marchetti, has been developed and used to estimate compression modulus for soils ranging from clayey to fine sands. Correlation of results with those of plate load tests is good. It is suggested that provided six separate measurements are made for each horizon, the dilatometer can replace the plate load test, with saving in labour and time outlays of a factor of 10-15. 914189 Application of ground improvement technique for the sixth cargo berth at Kandla lyengar, M; Basu, U; Dasgupta, S Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 VI, P373-381. Publ Edinburgh: Engineering Technics Press, 1989 An account of the successful application of the ground consolidation technique adopted for the construction of the sixth cargo berth at Kandla port in India is presented. Various aspects of the ground improvement work are discussed, highlighting, in particular, the scheme for stagewise build-up of preload, stability analysis, insitu measurement of shear strength of soil, and monitoring of the ground consolidation process. The experience gathered suggests that the ground improvement technique could be successfully adopted for optimising of construction cost for such construction in soft soils. Auth.
1991 Pergamon Press pie. Reproduction not permitted
914186 Collapsible-soil compaction by 80-ton mass rammer Ilichev, V A; Bagdasarov, Y A; Bytsutenko, O V; Gaidukov, A N Soil Mech Found Engng V27, N2. March-April 1990, P62-65
Soil liners have traditionally been compacted to a field minimum dry weight over a specified range of water content, a practice developed for structural fills, where strength and compressibility are the premier design criteria, rather than hydraulic conductivity. An alternative approach is suggested, based on defining water content-density requirements for a broad range of compactive effect, and relating these requirements to liner design parameters. A case example is described. Hydraulic conductivity measured on three soils was used to develop an acceptable zone for the compaction curve for use in construction quality control. Construction times are reduced if this approach is adopted.
In order to increase the thickness of the compacted bed and to investigate vibration propagation (for damage/safety distance estimation) and compacted depth, trials were carried out using a 4m square rammer of 80ton mass, dropped from heights 26.8m. Results indicate that the proportion of energy transmitted as elastic vibration rather than used for plastic deformation of the soil is greater as the drop height decreases. The 80 ton rammer allows very rapid site preparation, but cost factors favour the use of rammers of lower mass. 914187 Improving the reliability of determination of the compression modulus of silty-clayey soils from the results of compression tests
914183 Modeling one-dimensional compression characteristics of soils. Technical note Liu, J C; Znidarcic, D J Geoteeh Engng Div ASCE VII7, NI, Jan 1991, P162-169 A new extended power-function model and that of Hardin (1989) are compared as to their ability to replicate experimental and previously published data on one dimensional compression of soils. A wide variety of soils was considered, but the emphasis is on softer materials. Both models have similar predictive capability, but that of Hardin is more suitable for sensitive clays. Considerable experimental effort is needed to obtain the three parameters required by the new model.
914184 Continuous loading oedometer testing of soils Davison, L R; Atkinson, J H Q J Engng Geoi V23, N4, 1990. P347-355 The conventional step loading oedometer test (BS 1377:1975) provides relatively little data on compression and consolidation parameters of the soil or on its preconsolidation or yield pressure. Continuous loading tests overcome these drawbacks, and can be routinely carried out using data logging and control systems originally developed for stress path testing systems. Tests on reconstituted soils indicate that measured parameters do not depend significantly on type of test.
914185 Results of observations on settlements of filled-up bases in Yakutsk Roman, L T; lgnatova, G M; Tseeva, A N; Egorov, G E Soil Mech Found Engng V27, NI, Jan-Feb 1990, P6-11 Developments around Yakutsk will be on areas prepared with hydraulic fill. Fill placement has led to thawing and saturation of the top layer of permafrost, leading to settlement of the soil base. Measurement of soil temperature, water content, thawing boundary depth, and settlement were made during fill placement and subsequent construction of foundations. Limiting calculated settlements and field data are compared. Observed movements are greater than predictions, but because there is no differential settlement, no structural damage has occurred. ~
Gurvich, E V; Dorokhova, L N; Mariupolskii, L G Soil Mech Found Engng V27, N2, March-April 1990, P78-80 It is not always possible to carry out plate loading tests to determine in situ the compressibility of a soil mass for foundation design calculations, and results of laboratory oedometer tests are substituted. Results are presented of a regression analysis to investigate the correlation of plate load and oedometer moduli over a range of applied pressures and which includes the effects of moisture content, porosity, and plasticity index on the compressibility of silty-clayey soils. 914188 Dilatometer for determination of the compression modulus of soils under field conditions Blekhman, D A; Labzov, Y V; Nikolaev, V B; Pyarnpuu, Z K; Mariupolskii, L G; Trofimenkov, Y G Soil Mech Found Engng V27, N2, March-April 1990. P81-86 Soil compressibility is a vital parameter for foundation design calculations. Of the many field and laboratory methods for its determination, the plate loading test is generally considered the most reliable. It is however time consuming and sometimes impractical. A dilatometer, similar to that of Marchetti, has been developed and used to estimate compression modulus for soils ranging from clayey to fine sands. Correlation of results with those of plate load tests is good. It is suggested that provided six separate measurements are made for each horizon, the dilatometer can replace the plate load test, with saving in labour and time outlays of a factor of 10-15. 914189 Application of ground improvement technique for the sixth cargo berth at Kandla lyengar, M; Basu, U; Dasgupta, S Proc 2nd International Conference on Foundations and Tunnels, London, 19-21 September 1989 VI, P373-381. Publ Edinburgh: Engineering Technics Press, 1989 An account of the successful application of the ground consolidation technique adopted for the construction of the sixth cargo berth at Kandla port in India is presented. Various aspects of the ground improvement work are discussed, highlighting, in particular, the scheme for stagewise build-up of preload, stability analysis, insitu measurement of shear strength of soil, and monitoring of the ground consolidation process. The experience gathered suggests that the ground improvement technique could be successfully adopted for optimising of construction cost for such construction in soft soils. Auth.
1991 Pergamon Press pie. Reproduction not permitted