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Expanded polystyrene (EPS) geofoam: an introduction to material behavior
86A
REINFORCEMENT:BOLTS & ANCHORS
review has five sub-themes, namely: l) manufacture of geotextiles in India and their properties, 2) testing equipment and specifications for geotextiles, 3) applications of geotexfiles, 4) research on geotextiles, and 5) the use of geotextiles made of natural fibres and materials. The paper also highlights the potential for growth in the use of geotextiles and their related products in India. (from Authors)
952318 Arch support enhancement of dose-to-wail gangways by roof bolting method T. Majcherczyk & A. Tajdus, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 97-103.
952314 The past, present and future for geosynthetics in Indonesia P. R. Rankilor, Geotextiles & Geomembranes, 13(6-7), 1994, pp 435-456.
The main reason for arch section strengthening by rock bolting is the stability improvement of a face/gate road intersection and smaller gate road closure behind the face. The types of gate road support strengthening depending on roof properties are described. Analytical and numerical methods of face/gate road are presented. Site observations from mines are also reported. (Authors)
This paper recounts some of the history of geotextile utilisation in Indonesia, remarking upon the considerable pioneering role of the country in the development and advancement of the science of geosynthetics. Specific applications are examined in the context of the Indonesian environment and observations are made with regard to the future potential of these materials in the future. (Author)
952319 Research of static and dynamic load of long rock bolts U. Bajzelj, J. Likar & F. Zigman, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 49-54.
952315 Yield of scratched geomembranes J. P. Giroud, J. F. Beech & K. L. Soderman, Geotextiles & Geomembranes, 13(4), 1994, pp 231-246. In this paper, it is demonstrated that geomembranes that have a stress-strain curve with a yield peak, such as high density polyethylene (HDPE) geomembranes, yield at a tensile strain that is significantly influenced by scratches on the surface of the geomembrane. It is shown that scratched HDPE geomembranes can exhibit yield at strains that are one-third to one-half the yield strain of intact geomembranes. The method presented in this paper makes it possible to quantify the reduction in HDPE geomemhrane yield strain due to scratches as a functioin of the scratch depth and the geomembrane thickness. (from Authors)
952316 Expanded polystyrene (El'S) geofoam: an introduction to material behavior J. S. Horvath, Geotextiles & Geomembranes, 13(4), 1994, pp 263-280. The new geosynthetic product category of 'gcofoam' was proposed in 1992. It encompasses polymeric and nonpolymeric foams that are used in geotechnical applications. Geofoams perform functions that traditional geosynthetic products cannot. In addition, geofoams can be used to complement or enhance the function of other geosynthetics. Thus, geofoams used either alone or with other geosyntheties offer new, cost-effective solutions to a wide variety of geotechnical problems. This paper provides an overview of the geotechnically relevant engineering properties of a specific geofoam material called expanded polystyrene (EPS). (from Author)
Research into the external axial force transfer along loaded steel bolts to surrounding rock was performed in order to determine optimal anchoring length. Results for dynamics loads on long cable bolts within front face blasting directly near measuring points are also given the second part of this report gives results for 'in situ' measurements with sensors at different depths and distances from the anchor head. The described measuring methods enables determination of the so called neutral point. With the known neutral point it is possible to optimize the rock bolt system as single or combined supporting system. (Authors)
952320 Bolted rock mass behavior A. W. Khair, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 17-24. This paper starts with a brief chronicle of rock reinforcement by bolts. It traces the development and theory behind the different types of roof bolting principles and their mechanisms. Two case studies are reviewed and the effectiveness of each bolting principle in regard to geotechnieal data are analyzed. Results demonstrate that no particular roof reinforcement system is a cure for all geologic and mining conditions. Hence roof reinforcements may require combined effects of the mechanisms offered by more than one rock reinforcement system. (Author)
952321 Contact problem for moddling of bolt action in rock J. Malik, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 199-202. In recent years numerical models have become an integral part of tunnel design. In this paper a new model of bolt system is described. This model describes the behaviour of bolt system by a special continuous procedure. The elastic behaviour of rock is studied then the non - linear model is formulated. (Author)
Bolts and anchors
952317 New developments in rockbolting K. Hurt, Colliery Guardian, 242(4), 1994, pp 133-4,1368,143. This presentation summarises the way in which rockbolting was successfully introduced into the UK coal mining industry and describes current developments aimed at further optimising the effectiveness of bolted support. (Authors)
952322 Transient and permanent rock-bolting: a computer-aided design scheme A. Kidybinski, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 25-29. Permanent rock-bolting as a sole support system of coal-mine roadways offers 70% materials costs savings when compared with arched openings, and reduces approx 80% transportation and repair costs. It requires careful simulation and design to include effects of rbeology, moisture and seismicity, as well as detailed analysis of roof-bed separation over time.
REINFORCEMENT:BOLTS & ANCHORS
review has five sub-themes, namely: l) manufacture of geotextiles in India and their properties, 2) testing equipment and specifications for geotextiles, 3) applications of geotexfiles, 4) research on geotextiles, and 5) the use of geotextiles made of natural fibres and materials. The paper also highlights the potential for growth in the use of geotextiles and their related products in India. (from Authors)
952318 Arch support enhancement of dose-to-wail gangways by roof bolting method T. Majcherczyk & A. Tajdus, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 97-103.
952314 The past, present and future for geosynthetics in Indonesia P. R. Rankilor, Geotextiles & Geomembranes, 13(6-7), 1994, pp 435-456.
The main reason for arch section strengthening by rock bolting is the stability improvement of a face/gate road intersection and smaller gate road closure behind the face. The types of gate road support strengthening depending on roof properties are described. Analytical and numerical methods of face/gate road are presented. Site observations from mines are also reported. (Authors)
This paper recounts some of the history of geotextile utilisation in Indonesia, remarking upon the considerable pioneering role of the country in the development and advancement of the science of geosynthetics. Specific applications are examined in the context of the Indonesian environment and observations are made with regard to the future potential of these materials in the future. (Author)
952319 Research of static and dynamic load of long rock bolts U. Bajzelj, J. Likar & F. Zigman, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 49-54.
952315 Yield of scratched geomembranes J. P. Giroud, J. F. Beech & K. L. Soderman, Geotextiles & Geomembranes, 13(4), 1994, pp 231-246. In this paper, it is demonstrated that geomembranes that have a stress-strain curve with a yield peak, such as high density polyethylene (HDPE) geomembranes, yield at a tensile strain that is significantly influenced by scratches on the surface of the geomembrane. It is shown that scratched HDPE geomembranes can exhibit yield at strains that are one-third to one-half the yield strain of intact geomembranes. The method presented in this paper makes it possible to quantify the reduction in HDPE geomemhrane yield strain due to scratches as a functioin of the scratch depth and the geomembrane thickness. (from Authors)
952316 Expanded polystyrene (El'S) geofoam: an introduction to material behavior J. S. Horvath, Geotextiles & Geomembranes, 13(4), 1994, pp 263-280. The new geosynthetic product category of 'gcofoam' was proposed in 1992. It encompasses polymeric and nonpolymeric foams that are used in geotechnical applications. Geofoams perform functions that traditional geosynthetic products cannot. In addition, geofoams can be used to complement or enhance the function of other geosynthetics. Thus, geofoams used either alone or with other geosyntheties offer new, cost-effective solutions to a wide variety of geotechnical problems. This paper provides an overview of the geotechnically relevant engineering properties of a specific geofoam material called expanded polystyrene (EPS). (from Author)
Research into the external axial force transfer along loaded steel bolts to surrounding rock was performed in order to determine optimal anchoring length. Results for dynamics loads on long cable bolts within front face blasting directly near measuring points are also given the second part of this report gives results for 'in situ' measurements with sensors at different depths and distances from the anchor head. The described measuring methods enables determination of the so called neutral point. With the known neutral point it is possible to optimize the rock bolt system as single or combined supporting system. (Authors)
952320 Bolted rock mass behavior A. W. Khair, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 17-24. This paper starts with a brief chronicle of rock reinforcement by bolts. It traces the development and theory behind the different types of roof bolting principles and their mechanisms. Two case studies are reviewed and the effectiveness of each bolting principle in regard to geotechnieal data are analyzed. Results demonstrate that no particular roof reinforcement system is a cure for all geologic and mining conditions. Hence roof reinforcements may require combined effects of the mechanisms offered by more than one rock reinforcement system. (Author)
952321 Contact problem for moddling of bolt action in rock J. Malik, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 199-202. In recent years numerical models have become an integral part of tunnel design. In this paper a new model of bolt system is described. This model describes the behaviour of bolt system by a special continuous procedure. The elastic behaviour of rock is studied then the non - linear model is formulated. (Author)
Bolts and anchors
952317 New developments in rockbolting K. Hurt, Colliery Guardian, 242(4), 1994, pp 133-4,1368,143. This presentation summarises the way in which rockbolting was successfully introduced into the UK coal mining industry and describes current developments aimed at further optimising the effectiveness of bolted support. (Authors)
952322 Transient and permanent rock-bolting: a computer-aided design scheme A. Kidybinski, in: Geomechanics 93. Proc. conference, Ostrava, 1993, ed Z. Rakowski, (Balkema), 1994, pp 25-29. Permanent rock-bolting as a sole support system of coal-mine roadways offers 70% materials costs savings when compared with arched openings, and reduces approx 80% transportation and repair costs. It requires careful simulation and design to include effects of rbeology, moisture and seismicity, as well as detailed analysis of roof-bed separation over time.