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Treatment of collapsible sands by dynamic compaction (In French)
310A and make the soil friable, plus the additional benefits of further adding sand, fly ash, rice husk ash, or cinder ash have been investigated. Improvements to UCS and soaked and unsoaked CBR are described. Soaking of the mix improves CBR, which is beneficial for subbase mixes which become submerged during the monsoon season. The improved mixes can be substituted for CNS layers in roadway construction, and also used in lime piles.
915352 Study of lhne columns in expansive clay Ayyar, T S R; Ramesan, K Proc Zndiaa Geotechnical Conference, 1989, Geotechniques of Probt&natic Soils aad Rocks, Visakha~wtaam, 14-16 December 1989 VI, P185-189. Pubt New Delhi: Sarita Prakashan. 1989
Laboratory model tests were used to evaluate methods of dispersing a fixed amount of lime in a clay soil. Four methods were investigated: quicklime in circular columns, in circular columns with horizontal projections, and on the periphery of an annular column, and slaked lime slurry. Shear test results suggest circular columns with horizontal projections, then circular columns, give the greatest improvement in soil strength. Increase in water content is seen following initial decrease, with consequent change in mechanical properties. Reasons for this are examined.
Soil compaction 915353 GroomI improvement case study: Tbomton road: Listerhillsr Bradford Slocombe, B C Proc 2nd Znternatioaal Conference on Foundations and Ttmaels, Lo&n, 19-21 September 1989 VI, P407-409. Pub1 Edinburgh: Engineering Technics Press, 1989
Reclamation of a large derelict site is described. Site investigation using over 200 boreholes and trial pits indicated fill over generally competent clay strata, and a thin, insignificant layer of alluvium. Treatment by vibroflotation for foundation bases and dynamic compaction was chosen for ground improvement. Care was necessary to prevent damage to surrounding structures. Techniques were continually re-assessed as more information became available.
915354 Treatment of coUrpsible sands by dynamic compaction (In Freach) Liausu, P; Varaksin, S Proc Zlth Znteraatioaal Conference on Soil Mechaaics and Foam&ion Engiaeeriag, Rio de Janeiro, 13-18 August 1989 VI, P623-624. Pub1 Rotterdam: A A Balkema. 1989
Collapsible loessial soils are widespread in many parts of the world. They have a cemented, macroporous structure and require special and controlled treatment if they are to be used as structural foundations. The effect of water content on their cementation is well known, and the treatment of dynamic compaction following wetting is used. This procedure has been carried out many times at sites up to 1OOOOO sq m in area, enabling collection of valuable information on collapsible soils behaviour. 0
915355 Treatment of chalk fill for light indp9trial developmeat at West Thurrock Thomson, G H; Buthee, N R Proc Znternational ChaZk Symposium, Brighton, 4-7 September 1989 P399-402. Pub1 London: Thomas Telford. 1990
During site investigation for the construction of light industrial and commercial estates, it was revealed that conventional foundations or piled foundations could not be used without special measures. The site is located in an old chalk quarry with the floor covered with varying thickness of fill material. Dynamic compaction was used for ground treatment. This enabled normal concrete pad and strip foundations to be used.
Surface Structures Base courses and pavements See also: 915346, 915351 915356
BEM-FEM approach for analysis of distresses in pavements SUM, N; Saxena, S K; Mohammadi, J Znt J Num Anal Meth Geomech V15, N2. Feb 1991, P103-119
A combined approach is presented for analysis of pavements subjected to mechanical and environmental loads. Temperature and moisture (seasonal, climatic) and applied loads (vehicular) are the three main factors affecting the serviceability of the pavement. A three dimensional temperature-moisture-modulus of elasticity relation is adopted for a typical clay subgrade and used to incorporate the environmental effects on pavement stresses. Infiltration of water at pavement joints, buckling of slabs under mechanical and thermal loads leading to slab-subgrade separation, and load-transfer effects at pavement joints are examined. 915357 Numerical modelling of reinforced unpaved roads Burd, H J; Houlsby, G T Proc 3rd Znternational Symposium on Numerical Moa%lv in Geomechanics (NUMOG ZZZ),Niagara FaUs, 8-ZZ May 1989 P699-706. Pub1 London: Eisevier Applied Science, 1989
A finite element model for a reinforced unpaved road under plane strain conditions is presented. It uses elastic-perfectly plastic soil models with von Mises and Matsuoka criteria respectively for cohesive base and frictional fill. Reinforcement is modelled using elastic membrane elements. The model is used to back analyse reinforcement tensions and interface stresses, which are difficult to measure experimentally, for laboratory model tests where a surface footing is jacked monotonically into the reinforced base. 915358 Experimental aad finite element analysis of non-square raft type concrete pavements Bull, J W; Luheshi, Y B Proc 3rd International Symposiam on Numerical MoaWs in Geomechanics (NUMOG ZZZ),Niagara FaZlv, 8-ZZ May 1989 P707-715. Pub1 London: Eisevier Applied Science, 1989
Numerical analysis using the finite element code PAFEC was used to simulate centrally loaded rectangular raft type pavements (length 2.0-2.44m, width 0.60%2.44m). Cases of no reinforcement and steel bar reinforcement on both surfaces or bottom surface only were studied. The square raft is the most
1991 Pergamon Press plc. Reproduction
not permitted
915352 Study of lhne columns in expansive clay Ayyar, T S R; Ramesan, K Proc Zndiaa Geotechnical Conference, 1989, Geotechniques of Probt&natic Soils aad Rocks, Visakha~wtaam, 14-16 December 1989 VI, P185-189. Pubt New Delhi: Sarita Prakashan. 1989
Laboratory model tests were used to evaluate methods of dispersing a fixed amount of lime in a clay soil. Four methods were investigated: quicklime in circular columns, in circular columns with horizontal projections, and on the periphery of an annular column, and slaked lime slurry. Shear test results suggest circular columns with horizontal projections, then circular columns, give the greatest improvement in soil strength. Increase in water content is seen following initial decrease, with consequent change in mechanical properties. Reasons for this are examined.
Soil compaction 915353 GroomI improvement case study: Tbomton road: Listerhillsr Bradford Slocombe, B C Proc 2nd Znternatioaal Conference on Foundations and Ttmaels, Lo&n, 19-21 September 1989 VI, P407-409. Pub1 Edinburgh: Engineering Technics Press, 1989
Reclamation of a large derelict site is described. Site investigation using over 200 boreholes and trial pits indicated fill over generally competent clay strata, and a thin, insignificant layer of alluvium. Treatment by vibroflotation for foundation bases and dynamic compaction was chosen for ground improvement. Care was necessary to prevent damage to surrounding structures. Techniques were continually re-assessed as more information became available.
915354 Treatment of coUrpsible sands by dynamic compaction (In Freach) Liausu, P; Varaksin, S Proc Zlth Znteraatioaal Conference on Soil Mechaaics and Foam&ion Engiaeeriag, Rio de Janeiro, 13-18 August 1989 VI, P623-624. Pub1 Rotterdam: A A Balkema. 1989
Collapsible loessial soils are widespread in many parts of the world. They have a cemented, macroporous structure and require special and controlled treatment if they are to be used as structural foundations. The effect of water content on their cementation is well known, and the treatment of dynamic compaction following wetting is used. This procedure has been carried out many times at sites up to 1OOOOO sq m in area, enabling collection of valuable information on collapsible soils behaviour. 0
915355 Treatment of chalk fill for light indp9trial developmeat at West Thurrock Thomson, G H; Buthee, N R Proc Znternational ChaZk Symposium, Brighton, 4-7 September 1989 P399-402. Pub1 London: Thomas Telford. 1990
During site investigation for the construction of light industrial and commercial estates, it was revealed that conventional foundations or piled foundations could not be used without special measures. The site is located in an old chalk quarry with the floor covered with varying thickness of fill material. Dynamic compaction was used for ground treatment. This enabled normal concrete pad and strip foundations to be used.
Surface Structures Base courses and pavements See also: 915346, 915351 915356
BEM-FEM approach for analysis of distresses in pavements SUM, N; Saxena, S K; Mohammadi, J Znt J Num Anal Meth Geomech V15, N2. Feb 1991, P103-119
A combined approach is presented for analysis of pavements subjected to mechanical and environmental loads. Temperature and moisture (seasonal, climatic) and applied loads (vehicular) are the three main factors affecting the serviceability of the pavement. A three dimensional temperature-moisture-modulus of elasticity relation is adopted for a typical clay subgrade and used to incorporate the environmental effects on pavement stresses. Infiltration of water at pavement joints, buckling of slabs under mechanical and thermal loads leading to slab-subgrade separation, and load-transfer effects at pavement joints are examined. 915357 Numerical modelling of reinforced unpaved roads Burd, H J; Houlsby, G T Proc 3rd Znternational Symposium on Numerical Moa%lv in Geomechanics (NUMOG ZZZ),Niagara FaUs, 8-ZZ May 1989 P699-706. Pub1 London: Eisevier Applied Science, 1989
A finite element model for a reinforced unpaved road under plane strain conditions is presented. It uses elastic-perfectly plastic soil models with von Mises and Matsuoka criteria respectively for cohesive base and frictional fill. Reinforcement is modelled using elastic membrane elements. The model is used to back analyse reinforcement tensions and interface stresses, which are difficult to measure experimentally, for laboratory model tests where a surface footing is jacked monotonically into the reinforced base. 915358 Experimental aad finite element analysis of non-square raft type concrete pavements Bull, J W; Luheshi, Y B Proc 3rd International Symposiam on Numerical MoaWs in Geomechanics (NUMOG ZZZ),Niagara FaZlv, 8-ZZ May 1989 P707-715. Pub1 London: Eisevier Applied Science, 1989
Numerical analysis using the finite element code PAFEC was used to simulate centrally loaded rectangular raft type pavements (length 2.0-2.44m, width 0.60%2.44m). Cases of no reinforcement and steel bar reinforcement on both surfaces or bottom surface only were studied. The square raft is the most
1991 Pergamon Press plc. Reproduction
not permitted