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Modelling stone column reinforced soil- a modified Voight approach
43A the various techniques over a range of structural geometries are assessed. The IMM offers the most realistic approach to the problem.
911339 Perf0rmlmce of an experimental reinforced earth structure using soft chalk backfills Brady, K C; Barratt, D A; Cater. R
911335 Predicting the behaviour of reinforced soil structures Jones, C J F P
Transport Road Research Laboratory Research Report N260, 1990, ]8P
Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushn, 5-7 October 1988 P535-540. Publ Rotterdam: A A Baikema, 1988 The factors which influence the behaviour of reinforced earth structures are examined: reinforcement properties and distribution; soil properties and soil state; construction; and structural aspects. Information on parameter selection is provided. The advantages of using the finite element model in design and analysis of reinforced structures are discussed, in particular the ability to include effects of construction techniques and presence of weak subsoil. 911336 TEXSOL: already more than 50 successful applications Leflaive, E
Proc International Geatechnical Symposium on Theory and Practice of Earth Reinforcement, Fuknoka Kyushn, 5-7 October 1988 P541-545. Publ Rotterdam: A A Balkema, 1988
A reinforced earth structure, consisting of two 30m long walls, 15m apart,height 4-5.6m, was constructed in Pauisgrove Quarry, Portsmouth. Three locally available chalks, with saturation moisture contents 22-29%, were used as-dug for backfill. Two proprietary reinforcing elements were used. Pore pressures, temperature, and movement of the structure were monitored,and pullout tests carried out. Excavation of a test heading confirmed low pullout resistances result from inadequate compaction of the backfill. Results indicate the chalks can be used successfully as backfill, provided placing and compaction are carefully controlled.
Soil stabilisation 911340 Lime-stabiliz,~l red mud bricks Dass, A; Malhotra, S K
Mater Stract V23, N136, July 1990, P252-255
The TEXSOL technique involves mixing continuous polymer yarn and soil (generally cohcsionless) to give a three dimensional structure. The use of TEXSOL in retaining structures in France is described, including steepening of a cut slope where it was cheaper and of better appearance than concrete walls, and creation of a 4m deep cut in water bearing clay, where the drainage and filtration properties of TEXSOL are important. Its shock absorbing properties may also be exploited. Full scale testing of structures and laboratory testing of fatigue and dynamic behaviour are described.
Around two million tonnes/yr of red mud (mainly oxides of A1, Fe, and Ti) waste material is produced by the Indian aluminium extraction industry. Initial attempts to produce lime stabilised red mud bricks are described. The bricks possess sufficient strength and weathering resistance for use in lowcost shelters. Modification of grain size distribution by addition of fly ash and coarse grained soils has been examined. Beneficial effects of lime stabilisation are considered to result from chemical action.
911337 Optimised computer programs for design of reinforced soil structures McCombie, P F; Bush, D 1
911341 Application of electro-osmosis for stabilization of tunnels in clayey-silt soils Schulter, A; Wagner, H
Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyuslm, 5-7 October 1988 P547-551. Publ Rotterdam: A A Balkema, ]988
Pete MMIJ[IMM Joint Symposium, Today's Technology for the Miniog and Metallargical Industries, Kyoto, 2-4 October 1989 1'245-249. Publ London: MMIJ/IMM, 1989
Detailed design of reinforced soil structures is a time consuming procedure, often requiring repetitive calculations. Such processes are suitable cases for application of computer technology. A computer program has been developed on the basis of extensive engineering experience. It is versatile and interactive and covers all stages from raw data to presentation of the design.
For many years, silty and clayey soils have been a problem in tunnel construction, especially when combined with water, creating soft ground conditions. Different solutions have been found including full face shield technology, slurry supported faces, earth pressure balance shields,and ground freezing. It is also known that soils of high density and low permeability are very difficult to dewater. Field and laboratory investigations in application of electroosmotic treatment of these soils are discussed.
911338 Modelling stone column reinforced soil - a modified Voight approach Schweiger, H F: Pande, G N
Proc 3rd International Symposium on Numerical Models in Geomechnnics (NUMOG Ill), Niagara Falls, 8-11 May 1989 P204-214. Publ London: Elsevier Applied Science, 1989
911342 Initial stage hardening characteristics of marine clay improved cement Tsutsumi, T; Tanaka, Y; Tanaka, T
A constitutive model for stone column reinforced soft clays is presented. Uniform and homogeneous distribution of the strengthening effect over the entire stabilised region is assumed. The basis of the theory is discussed in terms of theories applied to composite materials. It is shown that the law is based on a modified Voight assumption to ensure continuity of radial stresses between columns and soil. Finite element prediction of the behaviour of a column reinforced tank foundation utilising the soil model gives results in good agreement with observed behaviour.
Laboratory vane shear tests were used to study the initial hardening stages of marine clays of various origins, treated with ordinary and moderate heat treated Portland cement (MP), and blast furnace slag. Shear strength decreases with decreasing MP content and increasing cement/water ratio. Progress of hardening is strongly influenced by the activity of
Prac lnternatioanl Symposium on laboratory and Field Vane Shear Strength Testing, Tampa, 22-23 January 1987 P220229. Publ Philadelphia: ASTM, 1988 :ASTM Special Technical Publication 1014)
© 1991 Pergamon Press pie. Reproduction not permitted
911339 Perf0rmlmce of an experimental reinforced earth structure using soft chalk backfills Brady, K C; Barratt, D A; Cater. R
911335 Predicting the behaviour of reinforced soil structures Jones, C J F P
Transport Road Research Laboratory Research Report N260, 1990, ]8P
Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyushn, 5-7 October 1988 P535-540. Publ Rotterdam: A A Baikema, 1988 The factors which influence the behaviour of reinforced earth structures are examined: reinforcement properties and distribution; soil properties and soil state; construction; and structural aspects. Information on parameter selection is provided. The advantages of using the finite element model in design and analysis of reinforced structures are discussed, in particular the ability to include effects of construction techniques and presence of weak subsoil. 911336 TEXSOL: already more than 50 successful applications Leflaive, E
Proc International Geatechnical Symposium on Theory and Practice of Earth Reinforcement, Fuknoka Kyushn, 5-7 October 1988 P541-545. Publ Rotterdam: A A Balkema, 1988
A reinforced earth structure, consisting of two 30m long walls, 15m apart,height 4-5.6m, was constructed in Pauisgrove Quarry, Portsmouth. Three locally available chalks, with saturation moisture contents 22-29%, were used as-dug for backfill. Two proprietary reinforcing elements were used. Pore pressures, temperature, and movement of the structure were monitored,and pullout tests carried out. Excavation of a test heading confirmed low pullout resistances result from inadequate compaction of the backfill. Results indicate the chalks can be used successfully as backfill, provided placing and compaction are carefully controlled.
Soil stabilisation 911340 Lime-stabiliz,~l red mud bricks Dass, A; Malhotra, S K
Mater Stract V23, N136, July 1990, P252-255
The TEXSOL technique involves mixing continuous polymer yarn and soil (generally cohcsionless) to give a three dimensional structure. The use of TEXSOL in retaining structures in France is described, including steepening of a cut slope where it was cheaper and of better appearance than concrete walls, and creation of a 4m deep cut in water bearing clay, where the drainage and filtration properties of TEXSOL are important. Its shock absorbing properties may also be exploited. Full scale testing of structures and laboratory testing of fatigue and dynamic behaviour are described.
Around two million tonnes/yr of red mud (mainly oxides of A1, Fe, and Ti) waste material is produced by the Indian aluminium extraction industry. Initial attempts to produce lime stabilised red mud bricks are described. The bricks possess sufficient strength and weathering resistance for use in lowcost shelters. Modification of grain size distribution by addition of fly ash and coarse grained soils has been examined. Beneficial effects of lime stabilisation are considered to result from chemical action.
911337 Optimised computer programs for design of reinforced soil structures McCombie, P F; Bush, D 1
911341 Application of electro-osmosis for stabilization of tunnels in clayey-silt soils Schulter, A; Wagner, H
Proc International Geotechnical Symposium on Theory and Practice of Earth Reinforcement, Fukuoka Kyuslm, 5-7 October 1988 P547-551. Publ Rotterdam: A A Balkema, ]988
Pete MMIJ[IMM Joint Symposium, Today's Technology for the Miniog and Metallargical Industries, Kyoto, 2-4 October 1989 1'245-249. Publ London: MMIJ/IMM, 1989
Detailed design of reinforced soil structures is a time consuming procedure, often requiring repetitive calculations. Such processes are suitable cases for application of computer technology. A computer program has been developed on the basis of extensive engineering experience. It is versatile and interactive and covers all stages from raw data to presentation of the design.
For many years, silty and clayey soils have been a problem in tunnel construction, especially when combined with water, creating soft ground conditions. Different solutions have been found including full face shield technology, slurry supported faces, earth pressure balance shields,and ground freezing. It is also known that soils of high density and low permeability are very difficult to dewater. Field and laboratory investigations in application of electroosmotic treatment of these soils are discussed.
911338 Modelling stone column reinforced soil - a modified Voight approach Schweiger, H F: Pande, G N
Proc 3rd International Symposium on Numerical Models in Geomechnnics (NUMOG Ill), Niagara Falls, 8-11 May 1989 P204-214. Publ London: Elsevier Applied Science, 1989
911342 Initial stage hardening characteristics of marine clay improved cement Tsutsumi, T; Tanaka, Y; Tanaka, T
A constitutive model for stone column reinforced soft clays is presented. Uniform and homogeneous distribution of the strengthening effect over the entire stabilised region is assumed. The basis of the theory is discussed in terms of theories applied to composite materials. It is shown that the law is based on a modified Voight assumption to ensure continuity of radial stresses between columns and soil. Finite element prediction of the behaviour of a column reinforced tank foundation utilising the soil model gives results in good agreement with observed behaviour.
Laboratory vane shear tests were used to study the initial hardening stages of marine clays of various origins, treated with ordinary and moderate heat treated Portland cement (MP), and blast furnace slag. Shear strength decreases with decreasing MP content and increasing cement/water ratio. Progress of hardening is strongly influenced by the activity of
Prac lnternatioanl Symposium on laboratory and Field Vane Shear Strength Testing, Tampa, 22-23 January 1987 P220229. Publ Philadelphia: ASTM, 1988 :ASTM Special Technical Publication 1014)
© 1991 Pergamon Press pie. Reproduction not permitted