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Thrust-jacking technology (In German and English)
126A
Construction methods See abo: 854135
854157 Full-section sinking of a staple pit with hydraulic evacuation of the debris (In German and English) Externbrink, W Gluekauf V120, N20, 18 Oct 1984, P1297-1307 (german), P342-346 (english) The sinking of a 5.5m diameter, 166.5m deep shaft at the Heinrich Robert Colliery, Germany, is described. A Wirth full section shaft borer was used with hydraulic evacuation of the debris. Equipment and procedures are described. 854158 Prototype pipe jack cuts teeth at Bury Montague, S New Civ Engr 7 March 1985, P30-31 Rock cutting rollers mounted on a soft ground tunnel boring machine have proved a great success in the long pipe jack underway near Bury, UK. Description of the project and machine are presented. 854159 Thrust-jacking technology (In German and English) Krebs, W Tunnel NI, Feb 1985, P3-15 An overview of the thrust-jacking method of tunnel construction, where individual sections of the structure are added at the portal and jacked forward successively, is given. A comparison is made with the classical gallery drivage technique. Jacking profiles, jacking forces, jacket friction and ways of overcoming it, jacking and shield equipment requirements, difficult ground problems, and other difficulties arising in thrust-jacking are discussed. 85416O North America's largest ever raise bore contract Martin, D Tunn Tunnlg 1/17, N1, Jan 1985, P25-28 Over 2400m of shafts are being drilled through intermediate to acid volcanic rocks at the Harold Wright Mine, Vancouver, Canada. Three potential raise boring techniques are reviewed: (1) pilot drill down-raise bore up; (2) pilot up-raise down; and (3) blind hole raising. Blind hole raising is used when there is access for equipment only at the lower level and recent developments include the multi-purpose boring machine, which has no drill pipe and the entire borer climbs the raise under remote control. The conventional technique, drill down-raise up, was chosen in this case.
Surface Structures See a~o. 854012
854161 Centrifuge as a research tool Cheney, J A; Fragaszy, R J Geotech Test J V7, N4, Dec 1984, P182-187 A brief historical overview of the centrifuge, followed by a description of the basic principles of centrifuge modelling with examples of these principles.
854162 Microcomputer based data acquisition systems for centrifuge modeling Shen, C K; Li, X S; Kim, Y S Geotech Test J V7, 3/4, Dec 1984, P200-204 Discussion of the various microcomputer based data acquisition systems suitable for centrifuge model studies. Both the direct and indirect methods of signal transmission are illustrated. Examples of applications are given~ 854163 Role of case studies in the development of geotechnical engineering practice Seed, H B Proc 7th Panamerican Conference on Soil Mechanics and Foundation Engineering, Vancouver, June 1983 V3, P915-944. Publ Montreal." Canadian Geotechnical Society. 1983 The role of field case studies in the development of geotechnicat engineering practice is reviewed and illustrated with examples including construction of the pyramids in Egypt, failures of earth dams due to overtopping associated with uncontrolled reservoir filling, failures of hydraulic fill dams, the use of cut-off trenches in dam foundations and the influence ofsoil conditions on building damage during earthquakes. Suggestions are offered concerning the means for optimizing the lessons gained from field studies in engineering practice.
Dams and embankments See also: 854139, 854233, 854262
854164 Filter testing of broadly graded cohesionless tills Lafleur, J Can Geotech J V21, N4, Nov 1984. P634-643 Factors relevant to the development of a representative laboratory simulation of the complex filtration phenomenon are discussed; maximum particle size, density, saturation of the samples, direction of flow, intensity of the gradients and development of hydraulic fracturing. Preliminary test results are given for a till from the LG-3 dam. Test results demonstrate that filters specified for the LG-3 project are more than adequate. 854165 Comparison of observed and calculated slip surface in slope stability calculations. Technical note Talesnick, M; Baker, R Can Geotech J V21, N4, Nov 1984. P713-719 A re-analysis of four documented test embankment failures. An optimization procedure, SSOPT, is used, which searches a slope for the critical slip surface, without predefining the shape of this surface. Reasonable factors of safety and a good estimation of the expected slip surface are yielded by this procedure. 854166 Empingham Dam - design, construction and performance Bridle, R C; Vaughan, PR; Jones, H N inst Civ Engr Proc V78, Part 1, April 1985, P247-289 The foundation of the Empingham Dam, an earth fill embankment 37m high, 1200m long, is Upper Lias clay, extensively sheared and brecciated by valley bulging and periglacial disturbance. The weak foundation controlled the design, making a wide cross-section with berms necessary. Details of the site investigation; principle features of the design; design calculation; sand drain design; construction and performance; trial embankment and borrow pit slips: specifications for fills; and the con-
Construction methods See abo: 854135
854157 Full-section sinking of a staple pit with hydraulic evacuation of the debris (In German and English) Externbrink, W Gluekauf V120, N20, 18 Oct 1984, P1297-1307 (german), P342-346 (english) The sinking of a 5.5m diameter, 166.5m deep shaft at the Heinrich Robert Colliery, Germany, is described. A Wirth full section shaft borer was used with hydraulic evacuation of the debris. Equipment and procedures are described. 854158 Prototype pipe jack cuts teeth at Bury Montague, S New Civ Engr 7 March 1985, P30-31 Rock cutting rollers mounted on a soft ground tunnel boring machine have proved a great success in the long pipe jack underway near Bury, UK. Description of the project and machine are presented. 854159 Thrust-jacking technology (In German and English) Krebs, W Tunnel NI, Feb 1985, P3-15 An overview of the thrust-jacking method of tunnel construction, where individual sections of the structure are added at the portal and jacked forward successively, is given. A comparison is made with the classical gallery drivage technique. Jacking profiles, jacking forces, jacket friction and ways of overcoming it, jacking and shield equipment requirements, difficult ground problems, and other difficulties arising in thrust-jacking are discussed. 85416O North America's largest ever raise bore contract Martin, D Tunn Tunnlg 1/17, N1, Jan 1985, P25-28 Over 2400m of shafts are being drilled through intermediate to acid volcanic rocks at the Harold Wright Mine, Vancouver, Canada. Three potential raise boring techniques are reviewed: (1) pilot drill down-raise bore up; (2) pilot up-raise down; and (3) blind hole raising. Blind hole raising is used when there is access for equipment only at the lower level and recent developments include the multi-purpose boring machine, which has no drill pipe and the entire borer climbs the raise under remote control. The conventional technique, drill down-raise up, was chosen in this case.
Surface Structures See a~o. 854012
854161 Centrifuge as a research tool Cheney, J A; Fragaszy, R J Geotech Test J V7, N4, Dec 1984, P182-187 A brief historical overview of the centrifuge, followed by a description of the basic principles of centrifuge modelling with examples of these principles.
854162 Microcomputer based data acquisition systems for centrifuge modeling Shen, C K; Li, X S; Kim, Y S Geotech Test J V7, 3/4, Dec 1984, P200-204 Discussion of the various microcomputer based data acquisition systems suitable for centrifuge model studies. Both the direct and indirect methods of signal transmission are illustrated. Examples of applications are given~ 854163 Role of case studies in the development of geotechnical engineering practice Seed, H B Proc 7th Panamerican Conference on Soil Mechanics and Foundation Engineering, Vancouver, June 1983 V3, P915-944. Publ Montreal." Canadian Geotechnical Society. 1983 The role of field case studies in the development of geotechnicat engineering practice is reviewed and illustrated with examples including construction of the pyramids in Egypt, failures of earth dams due to overtopping associated with uncontrolled reservoir filling, failures of hydraulic fill dams, the use of cut-off trenches in dam foundations and the influence ofsoil conditions on building damage during earthquakes. Suggestions are offered concerning the means for optimizing the lessons gained from field studies in engineering practice.
Dams and embankments See also: 854139, 854233, 854262
854164 Filter testing of broadly graded cohesionless tills Lafleur, J Can Geotech J V21, N4, Nov 1984. P634-643 Factors relevant to the development of a representative laboratory simulation of the complex filtration phenomenon are discussed; maximum particle size, density, saturation of the samples, direction of flow, intensity of the gradients and development of hydraulic fracturing. Preliminary test results are given for a till from the LG-3 dam. Test results demonstrate that filters specified for the LG-3 project are more than adequate. 854165 Comparison of observed and calculated slip surface in slope stability calculations. Technical note Talesnick, M; Baker, R Can Geotech J V21, N4, Nov 1984. P713-719 A re-analysis of four documented test embankment failures. An optimization procedure, SSOPT, is used, which searches a slope for the critical slip surface, without predefining the shape of this surface. Reasonable factors of safety and a good estimation of the expected slip surface are yielded by this procedure. 854166 Empingham Dam - design, construction and performance Bridle, R C; Vaughan, PR; Jones, H N inst Civ Engr Proc V78, Part 1, April 1985, P247-289 The foundation of the Empingham Dam, an earth fill embankment 37m high, 1200m long, is Upper Lias clay, extensively sheared and brecciated by valley bulging and periglacial disturbance. The weak foundation controlled the design, making a wide cross-section with berms necessary. Details of the site investigation; principle features of the design; design calculation; sand drain design; construction and performance; trial embankment and borrow pit slips: specifications for fills; and the con-