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A 3D CAD geological analysis system
UNDERGROUND EXCAVATIONS:TUNNELS time, which turned out be greater than 5 years, the excavations were maintained without lining. A back-analysis, by means of the distinct element method, was carried out. The results proved the real behaviour to be influenced by the dilatant discontinuities and the block interiockings producing a stress distribution favorable to the global stability. (Authors) 953225 A 3D CAD geological analysis system S. Koyama, R. M o r i t a & E. Hisakawa, in: Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 385-390.
This system is intended for the visualization of information on subsurface geological conditions to facilitate underground design and construction work. For this purpose, the accurate estimation of geological structure and ground properties based on the data obtained in the investigation and construction phases, as well as the visualization of the modeling results and underground structures using a 3D CAD system are required. This report presents the results of applications of this system to field data. (Authors)
Tunnels
135A
953228 Workplace environmental conditions and innovative tunnel driving techniques: measurement and control S. Pelizza, M. Patrucco & G. Benedetto, in: Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 617-623.
The paper refers on the results of a data collection on workplace environmental conditions at the faces of some Italian tunnels, where the primary drifting is carried out by means of High Energy Hydraulic Hammers (H.E.H.H.). Problems arise, mainly due to the exposure conditions of workers to noise and airborne particulates, since, to win the same quantity of rock won by traditional drilling and blasting techniques, the H.E.H.H. machine must work much longer than a multiple arm boomer. Moreover, it is a common practice to carry on the mucking operations together with the H.E.H.H. machine working. As a consequence, the resulting overall environmental pollution at the face can rise to concerning values. The paper summarizes some of the possible control techniques suitable both to reduce the pollutants production and to lower the exposure of workers, (Authors)
953229 State-of-the art technology aids tunnelHng techniques
953226
J. Lock, Tunnels & Tunnelling, 26(I0), 1994, pp 43-45.
Tunneililg and ground conditions. Proceeding of the imerutioMI congress, Cairo, April 1994
A state of the art review of monitoring and measuring aids and equipment in support of tunnelling operations. It covers manufacturers and products in the areas of surveying technology, computer management, underground movement measurement, and health and safety systems. (J.M.McLaugldin)
ed M. E. A. Salam, (A.A. Balkema), ISBN (hardback) 90 5410 363 9, price D r 195.00, 1994, 690 pp. This book contains 89 papers (some abstracted separately) prepared and presented at the Annual Congress of the International Tunnelling Association in Cairo - Egypt between 3 and 7 April 1994 by prominent experts in the design and construction of tunnels and other underground structures and provides a wealth of information on various aspects of tunnelling in different ground conditions. The papers encompass many aspects of tunnelling including recent case histories of major projects, tunnelling through water bearing deposits, underground projects in rock formations, recent research and development of underground space, numerical and experimental modelling of tunnels, repair of tunnels, management of underground projects and other general tunnelling topics. The papers focus on the results of recent research on these topics, current construction techniques and methods of overcoming some of the problems encountered recently during the construction of underground projects. (from Editors) 953227 Role of geotochnicni monitoring in quality management of tonnemag projects A.-H. H. Hosny & F. M. EI-Nahhas, in: Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 587-591.
Tunnelling projects are considered high-risk because of the uncertainties involved in the underground works, and hence need high level of controls. 'Feedback Control System' is considered an ideal model for quality management of tunnelling projects which require continuous interaction between design and construction from the planning stage and up to commissioning. Gentechnical monitoring during construction can be implemented as a technical quality element of the feedback control system for major tunnelling projects. This paper describes a flow chart of the feedback control system and identifies the role of geotechnical monitoring within its framework. Some examples of construction monitoring programs utilizing geotechnicai instrumentations for tunnelling projects in Egypt are also described. (Authors) RMMS32'3--1
953230 Rock mass conditions dictate choice between N M T and NATM N. Barton & E. Grimstad, Tunnels & Tunnelling, 26(10), 1994, pp 39-42.
Discusses the different applications of NMT and NATM tunnelling techniques. The essential features of NMT, which is most appropriate for drill and blast tunnels in jointed rock, are outlined. The fibre reinforced shotcrete support method is described. An update of the Q system for selecting NMT support is included. A table gives the ratings of the six Q system parameters for describing rock mass at any particular site. Attempts to combine NMT and NATM techniques are outlined. (J.M.McLaughlin)
953231 Face instability in tonnemogthroughthick fault zones T. Ogawa, K. Y. Lo, R. K. Rowe & K. Sekignchi, in:
Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 509-516. This paper deals with the problem of face stability of tunnelling in weak, thick fault zones. The results of threedimensional elasto-plastic analysis of stresses and displacements around the advancing face are presented. Using the results, together with a plane strain clasto-plastic closed-form solution, the concept of load sharing ratio between rockmass and support system is developed. Two mutually consistent criteria for face stability are introduced and design guidelines are suggested. The method of analysis is then applied to case histories of tunnelling in which large displacements and instability were repeatedly encountered. The results of analysis are generally consistent with field observations. (Authors)
This system is intended for the visualization of information on subsurface geological conditions to facilitate underground design and construction work. For this purpose, the accurate estimation of geological structure and ground properties based on the data obtained in the investigation and construction phases, as well as the visualization of the modeling results and underground structures using a 3D CAD system are required. This report presents the results of applications of this system to field data. (Authors)
Tunnels
135A
953228 Workplace environmental conditions and innovative tunnel driving techniques: measurement and control S. Pelizza, M. Patrucco & G. Benedetto, in: Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 617-623.
The paper refers on the results of a data collection on workplace environmental conditions at the faces of some Italian tunnels, where the primary drifting is carried out by means of High Energy Hydraulic Hammers (H.E.H.H.). Problems arise, mainly due to the exposure conditions of workers to noise and airborne particulates, since, to win the same quantity of rock won by traditional drilling and blasting techniques, the H.E.H.H. machine must work much longer than a multiple arm boomer. Moreover, it is a common practice to carry on the mucking operations together with the H.E.H.H. machine working. As a consequence, the resulting overall environmental pollution at the face can rise to concerning values. The paper summarizes some of the possible control techniques suitable both to reduce the pollutants production and to lower the exposure of workers, (Authors)
953229 State-of-the art technology aids tunnelHng techniques
953226
J. Lock, Tunnels & Tunnelling, 26(I0), 1994, pp 43-45.
Tunneililg and ground conditions. Proceeding of the imerutioMI congress, Cairo, April 1994
A state of the art review of monitoring and measuring aids and equipment in support of tunnelling operations. It covers manufacturers and products in the areas of surveying technology, computer management, underground movement measurement, and health and safety systems. (J.M.McLaugldin)
ed M. E. A. Salam, (A.A. Balkema), ISBN (hardback) 90 5410 363 9, price D r 195.00, 1994, 690 pp. This book contains 89 papers (some abstracted separately) prepared and presented at the Annual Congress of the International Tunnelling Association in Cairo - Egypt between 3 and 7 April 1994 by prominent experts in the design and construction of tunnels and other underground structures and provides a wealth of information on various aspects of tunnelling in different ground conditions. The papers encompass many aspects of tunnelling including recent case histories of major projects, tunnelling through water bearing deposits, underground projects in rock formations, recent research and development of underground space, numerical and experimental modelling of tunnels, repair of tunnels, management of underground projects and other general tunnelling topics. The papers focus on the results of recent research on these topics, current construction techniques and methods of overcoming some of the problems encountered recently during the construction of underground projects. (from Editors) 953227 Role of geotochnicni monitoring in quality management of tonnemag projects A.-H. H. Hosny & F. M. EI-Nahhas, in: Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 587-591.
Tunnelling projects are considered high-risk because of the uncertainties involved in the underground works, and hence need high level of controls. 'Feedback Control System' is considered an ideal model for quality management of tunnelling projects which require continuous interaction between design and construction from the planning stage and up to commissioning. Gentechnical monitoring during construction can be implemented as a technical quality element of the feedback control system for major tunnelling projects. This paper describes a flow chart of the feedback control system and identifies the role of geotechnical monitoring within its framework. Some examples of construction monitoring programs utilizing geotechnicai instrumentations for tunnelling projects in Egypt are also described. (Authors) RMMS32'3--1
953230 Rock mass conditions dictate choice between N M T and NATM N. Barton & E. Grimstad, Tunnels & Tunnelling, 26(10), 1994, pp 39-42.
Discusses the different applications of NMT and NATM tunnelling techniques. The essential features of NMT, which is most appropriate for drill and blast tunnels in jointed rock, are outlined. The fibre reinforced shotcrete support method is described. An update of the Q system for selecting NMT support is included. A table gives the ratings of the six Q system parameters for describing rock mass at any particular site. Attempts to combine NMT and NATM techniques are outlined. (J.M.McLaughlin)
953231 Face instability in tonnemogthroughthick fault zones T. Ogawa, K. Y. Lo, R. K. Rowe & K. Sekignchi, in:
Tunnelling and ground conditions. Prec. congress, Cairo, 1994, ed M.E.A. Salam, (Balkema), 1994, pp 509-516. This paper deals with the problem of face stability of tunnelling in weak, thick fault zones. The results of threedimensional elasto-plastic analysis of stresses and displacements around the advancing face are presented. Using the results, together with a plane strain clasto-plastic closed-form solution, the concept of load sharing ratio between rockmass and support system is developed. Two mutually consistent criteria for face stability are introduced and design guidelines are suggested. The method of analysis is then applied to case histories of tunnelling in which large displacements and instability were repeatedly encountered. The results of analysis are generally consistent with field observations. (Authors)