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Design of reinforced fill systems over voids
316A
REINFORCEMENT:EARTH
& GEOSYNTHETICS
ROCK AND SOIL REINFORCEMENT AND SUPPORT
Reinforced
General
Developments in deep foundations andground improvement schemes. Proceedings of a symposium, Bangkok, 1996
earth and geosynthetics
967205
967202 State-of-the-art room-and-pillar retreat mining in the Kittanning coalbed A. A. Campoli, D. Rebuck, T. P. Mucho & G. M. Molinda, Mining Engineering, 48(4), 1996, pp 30-35. The USBM conducted research to develop improved guidelines for selecting the type and pattern of roof support in different geologic environments. The goal is to minimize the over and under design of mine roof support, resulting in more productive and safer mines. To obtain the necessary data on roof behavior and support performance, USBM conducted several field studies. Each study covers roof geology, stress regime, ground reaction, support interaction and mining environment. A consistent experimental design is being used. This includes measurements of roof bolt loads and roof movements. So far, 10 studies have been conducted in several geologic settings. (from Authors)
Bolts and anchors 967203 Neue Entwicklungen bei vermortelten Ankern (New development for grouted rock bolts) U. Overwin, R. Rock, M. Blumel & P. Schwab, Feisbau, 14(l), 1996, pp 42-48. Installation of rock bolts usually is done close to the face, where rates of displacement are highest. Under unfavourable conditions relative displacement between bolt, grout and rock mass can amount to several centimetres per day. In this paper the new IBI-Rod System, a new type of grout on the basis of a rapid hardening portland cement, special pullout tests and practical experience is described. Bolt rib geometry and rib spacing have a considerable influence on the peak load. Based on the results of the first series of tests, specially designed bolts and improved grouts will be tested. Eventually the results will lead to recommendations for bolt and grout specifications for squeezing rock conditions. (English summary)
Direct rock support methods 967204 Analysis and design of an underground bard rock voussoir beam roof A. I. Sofianos, International Journal of Rock Mechanics & Mining Sciences, 33(2), 1996, pp 153-166. The behaviour of a voussoir hard rock beam roof is investigated by considering it to act as a symmetric flat arch with cracks at the abutments and at midspan. Analytical formulae are derived initially that evaluate, for any given geometry, loading and mechanical parameters of the beam, its deflection and strain within it in terms of the extreme and mean arch thicknesses. Three relations are then established, one of each of the three examined modes of failure, i.e. snap through, crushing of the rock and transverse slip at the abutment, that relate the loading of the beam, its mechanical parameters and its dimensions. Finally all three relations are incorporated in a single non-dimensional graph where the loading and mechanical beam parameters are related to beam geometry. (from Author)
ed A. S. Balasubramaniam, D. T. Bergado, N. Phien-Wei, S. W. Hong, S. A. Asbford & P. Nutalaya, (A.A. Balkema), ISBN (hardback) 90 5410 593 3, price Dfl 185 (US$115.00, E76.00), 1995, 302 pp. This publication comprises 21 papers contributed by experts on recent developments in geotextiles, geomembranes and other geosynthetics in ground improvement. The contents are divided into four sections; laboratory and field tests; embankments, excavations, slopes and earth retaining structures; soil and rock improvement; site investigation and other selected topics including coastal and estuarine development, clay stiffness at small strains and reinforced earth design. (from Publishers) 967206 Design of reinforced fill systems over voids S. W. Agaiby & C. J. F. P. Jones, Canadian Geotechnical Journal, 32(6), 1995, pp 939-945. Embankment till structures are often laid on formations that may develop cavities during their life-span. The use of geosynthetic reinforcement to mitigate the consequences of the formation of such cavities provides an appealing solution to the problem. To properly analyse the problem of reinforced fill overlying cavities, the reinforcement-till interaction has to be properly addressed and modelled for a realistic solution to be reached. Limited continuum analyses results are available for the problem. This paper presents the results of a systematic parametric continuum analysis that was carried out to study this problem. (from Authors) 967207
Analysis of membrane action in reinforced unpaved roads H. J. Burd, Canadian Geotechnical Journal, 32(6), 1995, pp 946-956. Describes the mechanics and design of reinforced unpaved roads built over soft clay, a particular application of the reinforced soil technique. A discussion is given of the mechanics of reinforced unpaved roads for the case of a single application of a plane strain, monotonic load, and the design procedures that are currently available for this type of structure are reviewed. A new analytical design model based on a membrane reinforcement mechanism is proposed. Results compare well with laboratory tests. The use of a finite element method to study this type of structure is described. (from Author) 967208 Reinforced soil ed P. Wheeler, Ground Engineering, 29(2), 1996, pp iii. This special supplement on reinforced soil is a joint production between Ground Engineering, New Civil Engineer, and the drafting committee of BS8006, the new Code of practice for strengthened/reinforced soils and other tills. The supplement is the first part of a unique joint initiative to get the theory and practice of working in reinforced soil better understood and appreciated in the world of civil engineering and soil mechanics. (from Editor) 967209 Reinforcing the past C.. . . Jones, New Civil Engineer (NCE), .
1165, 1996, pp vi-
Vlll,Xl.
This article reports on the development and use of reinforced soil from biblical times to the oresent dav. Two of the earliest remaining examples of soil r&nforcement are the Agar-Quf ziggurat north of Baghdad and the Great Wall of China. The development of reinforcement methods form simple straw mats through to the latest anchor systems are discussed. (C.Paice)
REINFORCEMENT:EARTH
& GEOSYNTHETICS
ROCK AND SOIL REINFORCEMENT AND SUPPORT
Reinforced
General
Developments in deep foundations andground improvement schemes. Proceedings of a symposium, Bangkok, 1996
earth and geosynthetics
967205
967202 State-of-the-art room-and-pillar retreat mining in the Kittanning coalbed A. A. Campoli, D. Rebuck, T. P. Mucho & G. M. Molinda, Mining Engineering, 48(4), 1996, pp 30-35. The USBM conducted research to develop improved guidelines for selecting the type and pattern of roof support in different geologic environments. The goal is to minimize the over and under design of mine roof support, resulting in more productive and safer mines. To obtain the necessary data on roof behavior and support performance, USBM conducted several field studies. Each study covers roof geology, stress regime, ground reaction, support interaction and mining environment. A consistent experimental design is being used. This includes measurements of roof bolt loads and roof movements. So far, 10 studies have been conducted in several geologic settings. (from Authors)
Bolts and anchors 967203 Neue Entwicklungen bei vermortelten Ankern (New development for grouted rock bolts) U. Overwin, R. Rock, M. Blumel & P. Schwab, Feisbau, 14(l), 1996, pp 42-48. Installation of rock bolts usually is done close to the face, where rates of displacement are highest. Under unfavourable conditions relative displacement between bolt, grout and rock mass can amount to several centimetres per day. In this paper the new IBI-Rod System, a new type of grout on the basis of a rapid hardening portland cement, special pullout tests and practical experience is described. Bolt rib geometry and rib spacing have a considerable influence on the peak load. Based on the results of the first series of tests, specially designed bolts and improved grouts will be tested. Eventually the results will lead to recommendations for bolt and grout specifications for squeezing rock conditions. (English summary)
Direct rock support methods 967204 Analysis and design of an underground bard rock voussoir beam roof A. I. Sofianos, International Journal of Rock Mechanics & Mining Sciences, 33(2), 1996, pp 153-166. The behaviour of a voussoir hard rock beam roof is investigated by considering it to act as a symmetric flat arch with cracks at the abutments and at midspan. Analytical formulae are derived initially that evaluate, for any given geometry, loading and mechanical parameters of the beam, its deflection and strain within it in terms of the extreme and mean arch thicknesses. Three relations are then established, one of each of the three examined modes of failure, i.e. snap through, crushing of the rock and transverse slip at the abutment, that relate the loading of the beam, its mechanical parameters and its dimensions. Finally all three relations are incorporated in a single non-dimensional graph where the loading and mechanical beam parameters are related to beam geometry. (from Author)
ed A. S. Balasubramaniam, D. T. Bergado, N. Phien-Wei, S. W. Hong, S. A. Asbford & P. Nutalaya, (A.A. Balkema), ISBN (hardback) 90 5410 593 3, price Dfl 185 (US$115.00, E76.00), 1995, 302 pp. This publication comprises 21 papers contributed by experts on recent developments in geotextiles, geomembranes and other geosynthetics in ground improvement. The contents are divided into four sections; laboratory and field tests; embankments, excavations, slopes and earth retaining structures; soil and rock improvement; site investigation and other selected topics including coastal and estuarine development, clay stiffness at small strains and reinforced earth design. (from Publishers) 967206 Design of reinforced fill systems over voids S. W. Agaiby & C. J. F. P. Jones, Canadian Geotechnical Journal, 32(6), 1995, pp 939-945. Embankment till structures are often laid on formations that may develop cavities during their life-span. The use of geosynthetic reinforcement to mitigate the consequences of the formation of such cavities provides an appealing solution to the problem. To properly analyse the problem of reinforced fill overlying cavities, the reinforcement-till interaction has to be properly addressed and modelled for a realistic solution to be reached. Limited continuum analyses results are available for the problem. This paper presents the results of a systematic parametric continuum analysis that was carried out to study this problem. (from Authors) 967207
Analysis of membrane action in reinforced unpaved roads H. J. Burd, Canadian Geotechnical Journal, 32(6), 1995, pp 946-956. Describes the mechanics and design of reinforced unpaved roads built over soft clay, a particular application of the reinforced soil technique. A discussion is given of the mechanics of reinforced unpaved roads for the case of a single application of a plane strain, monotonic load, and the design procedures that are currently available for this type of structure are reviewed. A new analytical design model based on a membrane reinforcement mechanism is proposed. Results compare well with laboratory tests. The use of a finite element method to study this type of structure is described. (from Author) 967208 Reinforced soil ed P. Wheeler, Ground Engineering, 29(2), 1996, pp iii. This special supplement on reinforced soil is a joint production between Ground Engineering, New Civil Engineer, and the drafting committee of BS8006, the new Code of practice for strengthened/reinforced soils and other tills. The supplement is the first part of a unique joint initiative to get the theory and practice of working in reinforced soil better understood and appreciated in the world of civil engineering and soil mechanics. (from Editor) 967209 Reinforcing the past C.. . . Jones, New Civil Engineer (NCE), .
1165, 1996, pp vi-
Vlll,Xl.
This article reports on the development and use of reinforced soil from biblical times to the oresent dav. Two of the earliest remaining examples of soil r&nforcement are the Agar-Quf ziggurat north of Baghdad and the Great Wall of China. The development of reinforcement methods form simple straw mats through to the latest anchor systems are discussed. (C.Paice)