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Breakout capacity of horizontal plate anchors
40A
Rock and Soil Reinforcement and Support Bolts and anchors See also: 921417, 921461 921306 Practical rock mechanics applied to underground mines Scott, J J Min Engng V43. N6, June 1991, P641-646 The 1991 Jackling Lecture. Problems which have affected the mining industry in the recent past are outlined, and the rock mechanics approach to solving some of them is considered. Detailed attention is given to two methods of roof support, the truss anchor and the split set friction rock stabiliser. The future of practical rock mechanics in mining is briefly discussed. 921307 Austrian road tunnel supported by water-expanded bolts Muller, S Tunn Tunnlg Summer 1991: NATM Special Issue, P13-14 A tight construction deadline was set for the 4.3kin Oswaldiberg road tunnel. The tunnel itself is in layered shaly rock with mica-schist containing quartzite and marble strata, moderately to heavily fissured but under low overburden pressure. The portals were constructed through river sediments using the Rodinjet grouting technique for support. Swellex water expanded bolts were used as a major component of the NATM support system because of ease and speed of installation. 921308 PC based modeling of rock reinforcement requirements in mine roadways Unal, E; Ergur, K Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P761-768. Publ Rotterdam: A A Balkema, 1990 ROCKBOLT V2.0 has been developed for prediction of reinforcement requirements for mine roadways. Type, pattern, and specification of rockbolt systems can be selected for various conditions of horizontal to vertical stress ratio and magnitude of horizontal stress. Mechanical, resin, Swellex, or DynaRok bolts may be specified. A worked example is used to demonstrate the flexibility, comprehensiveness, and ease of use of the program. 921309 Yieldable roof support for mines Herbst, T F Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P807-814. Publ Rotterdam: A A Balkema, 1990 Yieldable roof bolts with high deformation capacities, such as the Dywidag bolt with sliding nut, have been developed. During deformation or in the post failure stage, rock mass, roof, and bolt must be considered as a composite unit. Design is currently on empirical rather than analytical basis. Testing methods for these bolts are outlined. Support model development considering the kinematic sequence of deformation is
presented. Stress relief by formation of wedges, control In squeezing-out coal seams using inclined bolts, and roof stability of entries after mining are examined. 921310 Formable rock anchors - a new concept Scott, J J Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P815-822. Publ Rotterdam: A A Balkema, 1990 Formable anchors, those with structural strength before installation and a formable portion which achieves a force fit to anchor the support in the rock mass, are described. Friction (split set), inflatable (Swellex), and dynamic (Dyna-Rok) types are illustrated. Design consideration for rocks of various strength values and application to strata control in longwall coal mine entries are discussed, considering the suitability of each support type. 921311 Breakout capacity of horizontal plate anchors Barua, T R; Chattopadhyay, B C Proc Indian Geotechnical Conference, 1989, Geotechniques of Problematic Soils and Rocks, Visakhapatnam, 14-16 December 1989 VI, P353-357. Publ New Delhi: Sarita Prakashan, 1989 Horizontal plate anchors are commonly used to support structures subject to uplift or tilt loads. A general case analysis for pullout capacity of horizontal anchors in cohesive soils is presented, based on that previously developed for cohesionless soils. A circular failure surface is assumed. Comparison is made between predictions of the theory and reported experimental values of pullout resistance in a variety of soils. 921312 Stress-time state of anchor retaining walls for deep excavations Denev, D; Germanov, T Proc Ninth Danube-European Conference on Soil Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P69-74. Publ Budapest: Akademiai Kiado, 1990 Prestressed anchors are often used to help support retaining walls. The stress-time state of the anchor depends on the change of stress in the soil mass and the retaining structure. A simple analysis is presented considering an elastic anchor in a creeping soil mass. The time for the initial anchor tension to decrease to a critical value is evaluated. 921313 Principles and methods in design of ground anchors Petrasovits, G Proc Ninth Danube-European Conference on Soil Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P109-116. Publ Budapest: Akademiai Kiado, 1990 Bearing capacity of a ground anchor is a function of soil properties, anchor size, applied technology, and grouting technique and material, and is difficult to predict from a sound theoretical basis. Three simplified design approaches are found. The first is based on geostatic pressure, the second considers shearing resistance developed along the surface of the anchor on the basis of soil dilation, the third considers effects of grouting pressure on the shearing resistance. These approaches are outlined and their abilities compared and discussed with reference to different ground conditions.
© 1992 Pergamon Press plc. Reproduction not permitted
Rock and Soil Reinforcement and Support Bolts and anchors See also: 921417, 921461 921306 Practical rock mechanics applied to underground mines Scott, J J Min Engng V43. N6, June 1991, P641-646 The 1991 Jackling Lecture. Problems which have affected the mining industry in the recent past are outlined, and the rock mechanics approach to solving some of them is considered. Detailed attention is given to two methods of roof support, the truss anchor and the split set friction rock stabiliser. The future of practical rock mechanics in mining is briefly discussed. 921307 Austrian road tunnel supported by water-expanded bolts Muller, S Tunn Tunnlg Summer 1991: NATM Special Issue, P13-14 A tight construction deadline was set for the 4.3kin Oswaldiberg road tunnel. The tunnel itself is in layered shaly rock with mica-schist containing quartzite and marble strata, moderately to heavily fissured but under low overburden pressure. The portals were constructed through river sediments using the Rodinjet grouting technique for support. Swellex water expanded bolts were used as a major component of the NATM support system because of ease and speed of installation. 921308 PC based modeling of rock reinforcement requirements in mine roadways Unal, E; Ergur, K Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P761-768. Publ Rotterdam: A A Balkema, 1990 ROCKBOLT V2.0 has been developed for prediction of reinforcement requirements for mine roadways. Type, pattern, and specification of rockbolt systems can be selected for various conditions of horizontal to vertical stress ratio and magnitude of horizontal stress. Mechanical, resin, Swellex, or DynaRok bolts may be specified. A worked example is used to demonstrate the flexibility, comprehensiveness, and ease of use of the program. 921309 Yieldable roof support for mines Herbst, T F Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P807-814. Publ Rotterdam: A A Balkema, 1990 Yieldable roof bolts with high deformation capacities, such as the Dywidag bolt with sliding nut, have been developed. During deformation or in the post failure stage, rock mass, roof, and bolt must be considered as a composite unit. Design is currently on empirical rather than analytical basis. Testing methods for these bolts are outlined. Support model development considering the kinematic sequence of deformation is
presented. Stress relief by formation of wedges, control In squeezing-out coal seams using inclined bolts, and roof stability of entries after mining are examined. 921310 Formable rock anchors - a new concept Scott, J J Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P815-822. Publ Rotterdam: A A Balkema, 1990 Formable anchors, those with structural strength before installation and a formable portion which achieves a force fit to anchor the support in the rock mass, are described. Friction (split set), inflatable (Swellex), and dynamic (Dyna-Rok) types are illustrated. Design consideration for rocks of various strength values and application to strata control in longwall coal mine entries are discussed, considering the suitability of each support type. 921311 Breakout capacity of horizontal plate anchors Barua, T R; Chattopadhyay, B C Proc Indian Geotechnical Conference, 1989, Geotechniques of Problematic Soils and Rocks, Visakhapatnam, 14-16 December 1989 VI, P353-357. Publ New Delhi: Sarita Prakashan, 1989 Horizontal plate anchors are commonly used to support structures subject to uplift or tilt loads. A general case analysis for pullout capacity of horizontal anchors in cohesive soils is presented, based on that previously developed for cohesionless soils. A circular failure surface is assumed. Comparison is made between predictions of the theory and reported experimental values of pullout resistance in a variety of soils. 921312 Stress-time state of anchor retaining walls for deep excavations Denev, D; Germanov, T Proc Ninth Danube-European Conference on Soil Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P69-74. Publ Budapest: Akademiai Kiado, 1990 Prestressed anchors are often used to help support retaining walls. The stress-time state of the anchor depends on the change of stress in the soil mass and the retaining structure. A simple analysis is presented considering an elastic anchor in a creeping soil mass. The time for the initial anchor tension to decrease to a critical value is evaluated. 921313 Principles and methods in design of ground anchors Petrasovits, G Proc Ninth Danube-European Conference on Soil Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P109-116. Publ Budapest: Akademiai Kiado, 1990 Bearing capacity of a ground anchor is a function of soil properties, anchor size, applied technology, and grouting technique and material, and is difficult to predict from a sound theoretical basis. Three simplified design approaches are found. The first is based on geostatic pressure, the second considers shearing resistance developed along the surface of the anchor on the basis of soil dilation, the third considers effects of grouting pressure on the shearing resistance. These approaches are outlined and their abilities compared and discussed with reference to different ground conditions.
© 1992 Pergamon Press plc. Reproduction not permitted