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Dynamic consolidation of volcanic ash in Sumatra
172A 903330
903334
Ground improvement by sand lime piles
Dynamic consolidation of volcanic ash in Sumatra
Chummar, A V Proc ,Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 V2. P8.139-8.144. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Gambin, M P Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 ~ . P8.145-8.158. Publ Bangkok: Southeast Asian Geotechnical Society, 1987
Lime additions reduce the swelling characteristics of expansive cohesive soils and improve shear strength of soft clays. When lime admixture is as sand lime piles, drainage and consolidation rate are also improved. Sand lime piles were first studied in the laboratory then implemented on site. Case studies of the foundation of a two storey building, a tank foundation, and a railway embankment are described.
What is believed to be the first use of dynamic compaction on volcanic ash soils is described. The soils are mostly quartz. mica flakes, and feldspar, with small pumice grains, and depth of the deposit was up to 70m. Grain size distribution, saturation, moisture content, in situ density, and SPT blow count were determined. The soils were considered collapsible. Bearing capacity was increased sufficiently for an industrial plant to be constructed through the use of dynamic consolidation. with stone columns used in the poorer areas.
Soil compaction Ground freezing
See also: 903058
903335
903331
Improvement of hydraulic fills by ground modification Welsh, J P Proc Conference on Hydraulic Fill Structures, Fort Collins, 15-18 April 1988 P663-675. Publ New York: ASCE, 1988 ( Geotechnical Special Publication No 21) Ground modification techniques applicable to improvement of hydraulic fill are described, including deep dynamic compaction, vibro-compaction, vibro-replacement and grouting. Three case histories are presented to illustrate use of dynamic compaction, vibro-compaction, and compaction grouting. 903332
Characteristics of stress-strain and foundation deformation of intact and compacted collapsing loess Shi, J; Liu, Z D Proc International Conference on Engineering Problems of Regional Soils, Belting, !!-15 August 1988 P316-319. P,¢bl Beijing." International Academic Publishers. 1989 Triaxial compression tests were carried on wetted samples of loess taken from a site before and after compaction to depth of 6m by lime-soil piles. Effects of compaction on collapse, structure, compression, strength, and stress strain behaviour were studied. The compacted soil behaved in a similar manner to a non-collapsible soil. Results were used in finite element analysis of a foundation on a compacted layer in an intact loess soil mass. The layer acts as a cushion, spreading the load and reducing settlement. 903333
Improvements on hydraulic sandy fills by compaction sand piles Chung, Y T; Wu, W K; Chung, S T Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 V2. P8.57.8.68. Publ Bangkok: Southeast Asian Geotechnical Socieo,, 1987 A liquid natural gas terminal was constructed in Taiwan on a reclaimed site of hydraulic alluvial silty sand fill. To improve the subsoils to resist seismically induced liquefaction and maintain stability of slurry walls around the tanks, compaction sand piles were used. The effectiveness was monitored using SPT and CPT measurements. Results are analysed to evaluate influences of overburden pressure, pile spacing, fines content, and friction angle of the soil, and compared to empirical design predictions with a view to improving design methods.
Shaft sinking by ground freezing in the coal-mining industry in the Federal Republic of Germany Klein, J Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P269-280. Publ London: IMM, 1989 Development of the sliding shaft is described. The shaft is composed of a concrete outerlining and an inner lining supported on a foundation and separated by an annulus filled with asphalt. It was designed to overcome the effects of mining near the shaft and allow sinking through unstable, water bearing overburden, in which ground freezing must be used. Data from 10 freeze shafts, including geotcchnical aspects and thermophysical boundaries, are presented. The effect of mining on shaft lining performance is considered.
Surface Structures Geological factors of importance in surface structures 903336 Slopes in coloured sandstone: stability, constructional features,
experience (In German) Trischler, J; Durrwang, R Felsbau V7, N4, Nov 1989, P208-211 Slope stability in Bunter series sandstones has been studied. Sandstones, sandstone with claystone layers, sandstone/claystone alternations, and clays/one and claystone rich sequences are considered. On aclinal bedding,few stability problems arise, and steep, stepped slopes are possible. With inclined bedding, problems occur once inclination is above about I0 dug. A case history of a failed slope is illustrated. 903337
Geological problems at Uragua-i RCC dam Sollo, J P Int Water Power Dam Constr V41, NI2, Dec 1989, P36-40 Bedrock of the project site was horizontally layered basalt with two units. Vesicular amygdaloidal basalt gave good results on drilling and blasting, whilst microcrystalline basalt was closely jointed and less stable in open excavations, especially when weathered. Two dominant vertical joint sets were found in each unit. Weathered contact seams were also seen,
1990 Pergamon Press plc. Reproduction not permitted
903334
Ground improvement by sand lime piles
Dynamic consolidation of volcanic ash in Sumatra
Chummar, A V Proc ,Ninth Southeast Asian Geotechnicai Conference, Bangkok, 7-11 December 1987 V2. P8.139-8.144. Publ Bangkok: Southeast Asian Geotechnical Society. 1987
Gambin, M P Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 ~ . P8.145-8.158. Publ Bangkok: Southeast Asian Geotechnical Society, 1987
Lime additions reduce the swelling characteristics of expansive cohesive soils and improve shear strength of soft clays. When lime admixture is as sand lime piles, drainage and consolidation rate are also improved. Sand lime piles were first studied in the laboratory then implemented on site. Case studies of the foundation of a two storey building, a tank foundation, and a railway embankment are described.
What is believed to be the first use of dynamic compaction on volcanic ash soils is described. The soils are mostly quartz. mica flakes, and feldspar, with small pumice grains, and depth of the deposit was up to 70m. Grain size distribution, saturation, moisture content, in situ density, and SPT blow count were determined. The soils were considered collapsible. Bearing capacity was increased sufficiently for an industrial plant to be constructed through the use of dynamic consolidation. with stone columns used in the poorer areas.
Soil compaction Ground freezing
See also: 903058
903335
903331
Improvement of hydraulic fills by ground modification Welsh, J P Proc Conference on Hydraulic Fill Structures, Fort Collins, 15-18 April 1988 P663-675. Publ New York: ASCE, 1988 ( Geotechnical Special Publication No 21) Ground modification techniques applicable to improvement of hydraulic fill are described, including deep dynamic compaction, vibro-compaction, vibro-replacement and grouting. Three case histories are presented to illustrate use of dynamic compaction, vibro-compaction, and compaction grouting. 903332
Characteristics of stress-strain and foundation deformation of intact and compacted collapsing loess Shi, J; Liu, Z D Proc International Conference on Engineering Problems of Regional Soils, Belting, !!-15 August 1988 P316-319. P,¢bl Beijing." International Academic Publishers. 1989 Triaxial compression tests were carried on wetted samples of loess taken from a site before and after compaction to depth of 6m by lime-soil piles. Effects of compaction on collapse, structure, compression, strength, and stress strain behaviour were studied. The compacted soil behaved in a similar manner to a non-collapsible soil. Results were used in finite element analysis of a foundation on a compacted layer in an intact loess soil mass. The layer acts as a cushion, spreading the load and reducing settlement. 903333
Improvements on hydraulic sandy fills by compaction sand piles Chung, Y T; Wu, W K; Chung, S T Proc Ninth Southeast Asian Geotechnical Conference, Bangkok, 7-11 December 1987 V2. P8.57.8.68. Publ Bangkok: Southeast Asian Geotechnical Socieo,, 1987 A liquid natural gas terminal was constructed in Taiwan on a reclaimed site of hydraulic alluvial silty sand fill. To improve the subsoils to resist seismically induced liquefaction and maintain stability of slurry walls around the tanks, compaction sand piles were used. The effectiveness was monitored using SPT and CPT measurements. Results are analysed to evaluate influences of overburden pressure, pile spacing, fines content, and friction angle of the soil, and compared to empirical design predictions with a view to improving design methods.
Shaft sinking by ground freezing in the coal-mining industry in the Federal Republic of Germany Klein, J Proc Conference on Shaft Engineering, Harrogate, 5-7 June 1989 P269-280. Publ London: IMM, 1989 Development of the sliding shaft is described. The shaft is composed of a concrete outerlining and an inner lining supported on a foundation and separated by an annulus filled with asphalt. It was designed to overcome the effects of mining near the shaft and allow sinking through unstable, water bearing overburden, in which ground freezing must be used. Data from 10 freeze shafts, including geotcchnical aspects and thermophysical boundaries, are presented. The effect of mining on shaft lining performance is considered.
Surface Structures Geological factors of importance in surface structures 903336 Slopes in coloured sandstone: stability, constructional features,
experience (In German) Trischler, J; Durrwang, R Felsbau V7, N4, Nov 1989, P208-211 Slope stability in Bunter series sandstones has been studied. Sandstones, sandstone with claystone layers, sandstone/claystone alternations, and clays/one and claystone rich sequences are considered. On aclinal bedding,few stability problems arise, and steep, stepped slopes are possible. With inclined bedding, problems occur once inclination is above about I0 dug. A case history of a failed slope is illustrated. 903337
Geological problems at Uragua-i RCC dam Sollo, J P Int Water Power Dam Constr V41, NI2, Dec 1989, P36-40 Bedrock of the project site was horizontally layered basalt with two units. Vesicular amygdaloidal basalt gave good results on drilling and blasting, whilst microcrystalline basalt was closely jointed and less stable in open excavations, especially when weathered. Two dominant vertical joint sets were found in each unit. Weathered contact seams were also seen,
1990 Pergamon Press plc. Reproduction not permitted