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Control of soil improvement by crosshole testing
114A 843315 Reinforcement of clay soils and waste materials using grids Jewell, R A; Jones, C J F P Proc lOth International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 15-19 June 1981 V3, P701-706. Publ Rotterdam: A. A. Balkema, 1981 Laboratory and field test results are used to show that cohesive soils and mine waste materials may be strengthened by mechanical reinforcement and used for construction. A limit equilibrium analysis for calculating the shear strength of the reinforced soil is presented. Examples of the use of reinforced cohesive soils are provided. 843316 Soil reinforcing by passive bars (In French) Juran, I; Schlosser, F; Louis, C; Kernoa, M; Eckmann, B Proc lOth International Conference on Soil Mee&mics and Fo~utation Engineering, Stockholm, 15-19 Jane 1981 V3, P713-716. Publ Rotterdam: A. A. Balkema, 1981 Presents an experimental study of the shear behaviour of soil reinforced with passive bars perpendicular to the plane of shear. Tests performed in a large shear box have shown evidence of interaction between the soil and the bars. Deformation gauges attached to the bars have shown that they work essentially by bending. A theoretical analysis enables conclusions to be drawn about the dimensioning of structures in nailed soil. 843317 Runway on 'Geodrnin'-ed soft clay in Turku, Finland Rathmayer, H; Leminen, K Proc lOtk lnter~tiomd Conference on Soil Mechanics and Founduffon Eagimeering, Stockholm, 15-19 June 1981 V3, P765-772. Pubi Rotterdam: A. A. Balkema, 1981 Vertical drainage with stepwise loading was chosen to improve the soft clay foundation soil for an extension to the runway at Turku Airport. 843318 Control of soil improvement by crosahole testing Woods, R D; Partos, A Proc lOtk International Conference on Soil Mechanics and Foumdution Etqineeriq, Stockholm, 15-19 Jane 1981 V3, P793-796. Publ Rotterdam: A. A. Balkema, 1981 It was desired to convert an existing building from a light industrial use to an application requiring die forging machines. The soils at the site consisted of loose, silty, fine sands to a depth of about 16m. Compaction and chemical grouting were proposed to improve the site. Resonant column tests were run on compacted and chemically grouted samples of the sand to find the range of achievable shear moduii. Crosshole seismic tests after each of two stages of compaction and after chemical grouting provided a very sensitive and accurate method of checking soil improvement. Vibration measurements after 2 and 14 months showed machine and floor motions in the expected range and no adverse settlements had occurred. Auth.
B o l t s and a n c h o r s 843319 Centrifugal model tests on vertical anchor plates Dickin, E A; Leung, C F J Geoteck Engng Die ASCE V109, NGT12, Dec 1983, P1503-1525 A large number of centrifugal model tests were run using 1 and 2 inch models to examine the stress displacement behaviour of vertical anchor plates and continuous anchor walls when subjected to horizontal pull out forces. The results were compared with those from conventional small model tests in order to
evaluate potential errors in direct extrapolation of the latter to field scale. Considerable overprediction of pull out resistance and underestimation of failure displacement was found. 843320 Introducing strata bolts in Kuzbass pits (In Russian) Petrov, A I Shakhtnoe Stroit NS, Aug 1983, P4-7 A new bolt is described for use in the Kuzbass pits, USSR. Bolt tension under established rock pressure reached 17kN. The bolts deform 15-20% less than metal and timber frames during the initial period of rock movement subsequent to drivage. Bonding strength is given as 80-85kN for thrust bolts and 75-82kN for resin grouted bolts.
843321 Application of finite element method to pullout resistance of buried anchor Tagaya, K; Tanaka, A; Aboshi, H Soils Found V23, N3, Sept 1983, P91-104 A finite element analysis of the pullout resistance of a buried anchor was performed and compared with results from a pullout test in a centrifugal testing machine. 843322 Theoretical and experimental studies in hearing behaviour and corrosion protection of rock anchors up to a load limit of about 4900kN Natau, O P; Wullschlager, D H Proc 5tk Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PA59-A64. Publ Rotterdam: A. A. Balkema, 1983 Results of a fundamental test of a cemented grouted permanent 4900kN rock anchor with a working load of 2780kN are described. A concreted steel tube was designed in such a way that its stress-strain behaviour was similar to a rock mass with linear elastic material behaviour. The axial and tangential strains of the steel tube were gauged to determine the course of the load transmission. The large scale test was simulated by the Finite Element Method. The assigned measures against corrosion proved to be sufficient. 843323 Non-destructive field test of cement-grouted bolts with the boltometer Bergman, S G A; Krauland, N; Martna, J; Paganus, T Proc 5th Congress of the lnternatio~ Society for Rock Mechanics, Melbo~ne, 10-15 April 1983 V1, PAI77-AI81. Publ Rotterdam: A. A. Balkema, 1983 A classification system has been proposed based on tests carried out using a prototype Boltometer, an electronic instrument for the in situ non-destructive testing of grouted rock bolt quality. The results of tests on 271 cement-grouted bolts and 21 resin grouted bolts, carried out to verify its validity, are reported. 843324 Guide to the use of rook reinforcement in underground excavations Douglas, T H; Arthur, L J Construction Industry Research and Information Association report NIO1, 1983, 74P After describing the mechanics of failure of underground excavations, the concepts of rock reinforcement are outlined. A full description is given of the three most common types of reinforcement: rock dowels, rock bolts and rock anchors, with the basic factors to be considered for corrosion protection. Selected case studies appear in an appendix.
B o l t s and a n c h o r s 843319 Centrifugal model tests on vertical anchor plates Dickin, E A; Leung, C F J Geoteck Engng Die ASCE V109, NGT12, Dec 1983, P1503-1525 A large number of centrifugal model tests were run using 1 and 2 inch models to examine the stress displacement behaviour of vertical anchor plates and continuous anchor walls when subjected to horizontal pull out forces. The results were compared with those from conventional small model tests in order to
evaluate potential errors in direct extrapolation of the latter to field scale. Considerable overprediction of pull out resistance and underestimation of failure displacement was found. 843320 Introducing strata bolts in Kuzbass pits (In Russian) Petrov, A I Shakhtnoe Stroit NS, Aug 1983, P4-7 A new bolt is described for use in the Kuzbass pits, USSR. Bolt tension under established rock pressure reached 17kN. The bolts deform 15-20% less than metal and timber frames during the initial period of rock movement subsequent to drivage. Bonding strength is given as 80-85kN for thrust bolts and 75-82kN for resin grouted bolts.
843321 Application of finite element method to pullout resistance of buried anchor Tagaya, K; Tanaka, A; Aboshi, H Soils Found V23, N3, Sept 1983, P91-104 A finite element analysis of the pullout resistance of a buried anchor was performed and compared with results from a pullout test in a centrifugal testing machine. 843322 Theoretical and experimental studies in hearing behaviour and corrosion protection of rock anchors up to a load limit of about 4900kN Natau, O P; Wullschlager, D H Proc 5tk Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PA59-A64. Publ Rotterdam: A. A. Balkema, 1983 Results of a fundamental test of a cemented grouted permanent 4900kN rock anchor with a working load of 2780kN are described. A concreted steel tube was designed in such a way that its stress-strain behaviour was similar to a rock mass with linear elastic material behaviour. The axial and tangential strains of the steel tube were gauged to determine the course of the load transmission. The large scale test was simulated by the Finite Element Method. The assigned measures against corrosion proved to be sufficient. 843323 Non-destructive field test of cement-grouted bolts with the boltometer Bergman, S G A; Krauland, N; Martna, J; Paganus, T Proc 5th Congress of the lnternatio~ Society for Rock Mechanics, Melbo~ne, 10-15 April 1983 V1, PAI77-AI81. Publ Rotterdam: A. A. Balkema, 1983 A classification system has been proposed based on tests carried out using a prototype Boltometer, an electronic instrument for the in situ non-destructive testing of grouted rock bolt quality. The results of tests on 271 cement-grouted bolts and 21 resin grouted bolts, carried out to verify its validity, are reported. 843324 Guide to the use of rook reinforcement in underground excavations Douglas, T H; Arthur, L J Construction Industry Research and Information Association report NIO1, 1983, 74P After describing the mechanics of failure of underground excavations, the concepts of rock reinforcement are outlined. A full description is given of the three most common types of reinforcement: rock dowels, rock bolts and rock anchors, with the basic factors to be considered for corrosion protection. Selected case studies appear in an appendix.