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Chemical grouting - 2
61A
Shotcrete 862174 Why add to shotcrete? Jones, M Tunn Tunnlg V17, N7, July 1985, P53-58 Various additives have been developed for shotcrete to improve its properties, either during application, or in its completed form; currently accelerators and steel fibres dominate. Description of the variety of additives available is given, with emphasis on the need to establish valid product and method standards.
Direct rock support methods 862175 Current and future UK practice for the permanent support of shaft excavations Black, J C; Auld, F A Int J Min Engng V3, Nl. March 1985, P35-48
862178 Controlled load development at longwail coalfaces Isaac, A K; Bradbury, T J; Holland, C J In: Rock Mechunics in Productivity and Protection (Proceedings of the Twenty-Fifrh Symposium on Rock Mechunics, Evunston, IRim&, 25-27 June 1984) P659-666. Pub1 Nenl York: AIME, 1984 The effectiveness of coalface powered support systems can depend upon the manner of application of the hydraulic system. The early period of the advance-reset cycle can be particularly important. The use of supports with positive set pressure valves, which maintain the level of setting pressure, reduces roof bed separation, increases the level of strata control and improves face productivity. 862179 Technique to measure resultant load vector on shield supports Barczak, T M; Garson, R C In: Rock Mechunics in Productivity and Protection (Proceedings of tk Twenty-FjIh Symposium on Rock Mechunics, Evanston, Illinois, 25-27 June 1984) P667-679. Pub1 New York: AIME, I984
In the UK, mining development is primarily concerned with the coal industry. Sandstone, marl, limestone and coal measures are the predominant strata through which new shafts or existing shaft deepening penetrate. Hydrogeological information, the loadings imposed on shaft linings in such strata and design philosophy are discussed. Design formulae are quoted and design practice is reviewed with reference to the current UK Codes of Practice for concrete construction. Construction aspects and the influence of strata water control measures are discussed in relation to recent advances using high-strength concrete and water pressure relief. New concepts in shaft lining design are proposed and discussed. The significant features of shaft lining design and construction are emphasized.
The resultant load vector represents the forces applied to a longwall roof support element. The complex kinematics of the shield support have been examined on a theoretical basis. A method of determining the resultant load vector by instrumenting supports to measure leg, canopy capsule and curved link forces is under development. The concept has been laboratory tested in a mine roof simulator. Lack of suitable instrumentation has, to date, prevented validation under longwall conditions. It is thought that the studies will provide an advancement in state-of-the-art longwall roof support and provide a basis for studies on improved support design.
862176 Interaction of powered supports and the strata in coal seams under a heavy roof Budirsky, S Int J Min Engng V3, N2, July 1985, P113-138
See also: 862054
The interaction of powered supports and the strata in thick coal seams under a heavy roof, when subjected to anomalous phenomena, is discussed. In particular, rock bursts, which have occurred in the Upper Silesian Coal Basin in the last few years, are considered. On the basis of the results of long-term field measurements and theoretical analyses, the necessary setting and yield loads of powered supports, as well as the loading patterns which appear during rock bursts, have been determined. A methodology for the testing of powered supports destined for coal seams prone to rock bursts, which requires the building of a rapid closure rig, is proposed. 862177 Chinese approach to tunnel support Cai, W W; Li, S 2 Tunn Tunnlg V17, N7, July 1985, P30-37 The principles of the NATM, rockbolts and shotcrete support, have been successfully applied in China to cavern and tunnel excavation in poor geological conditions. The problems of achieving quicker, safer and more economical results in the construction of underground works for hydroelectric power stations are considered and presented. They are based primarily on experience with such projects in China, as well as experience abroad of the principles and use of the NATM. 0
Grouting
862180 Chemical grouting - 2 Littlejohn, G S Ground Engng V18, N3. April 1985, P23-28 Topics covered include: grout selection; viscosity; setting time; stability; strength of grouted formations; creep of grouted formations; resistance of grout to extrusion; permeability of grouted formations; penneance; and health and safety aspects. 862181 Chemical grouting - 3 Littlejohn, G S Ground Engng VI8. N4, May 1985. P29-34 Grouting operations are examined. Each case is influenced by ground conditions and the degree of control required for grout placement into different zones. Importance of grout monitoring is emphasised. Case records are described from dams, tunnels, drifts and shafts, excavations and underpinning, illustrating that chemical grouting is well established for impermeabilisation and strengthening of the ground. 64 refs. 862182 Chemical grouting in soils permeated by water Krizek, R J; Perez, T J Geotech Engng Div ASCE VII 1. N7, July 1985, P898-915 Using data from seventy-nine large scale one dimensional laboratory tests,limiting conditions were established to define the transition zone between retention and elutriation of chemical
1986 Pergamon Press Ltd. Reproduction
not permitted
Shotcrete 862174 Why add to shotcrete? Jones, M Tunn Tunnlg V17, N7, July 1985, P53-58 Various additives have been developed for shotcrete to improve its properties, either during application, or in its completed form; currently accelerators and steel fibres dominate. Description of the variety of additives available is given, with emphasis on the need to establish valid product and method standards.
Direct rock support methods 862175 Current and future UK practice for the permanent support of shaft excavations Black, J C; Auld, F A Int J Min Engng V3, Nl. March 1985, P35-48
862178 Controlled load development at longwail coalfaces Isaac, A K; Bradbury, T J; Holland, C J In: Rock Mechunics in Productivity and Protection (Proceedings of the Twenty-Fifrh Symposium on Rock Mechunics, Evunston, IRim&, 25-27 June 1984) P659-666. Pub1 Nenl York: AIME, 1984 The effectiveness of coalface powered support systems can depend upon the manner of application of the hydraulic system. The early period of the advance-reset cycle can be particularly important. The use of supports with positive set pressure valves, which maintain the level of setting pressure, reduces roof bed separation, increases the level of strata control and improves face productivity. 862179 Technique to measure resultant load vector on shield supports Barczak, T M; Garson, R C In: Rock Mechunics in Productivity and Protection (Proceedings of tk Twenty-FjIh Symposium on Rock Mechunics, Evanston, Illinois, 25-27 June 1984) P667-679. Pub1 New York: AIME, I984
In the UK, mining development is primarily concerned with the coal industry. Sandstone, marl, limestone and coal measures are the predominant strata through which new shafts or existing shaft deepening penetrate. Hydrogeological information, the loadings imposed on shaft linings in such strata and design philosophy are discussed. Design formulae are quoted and design practice is reviewed with reference to the current UK Codes of Practice for concrete construction. Construction aspects and the influence of strata water control measures are discussed in relation to recent advances using high-strength concrete and water pressure relief. New concepts in shaft lining design are proposed and discussed. The significant features of shaft lining design and construction are emphasized.
The resultant load vector represents the forces applied to a longwall roof support element. The complex kinematics of the shield support have been examined on a theoretical basis. A method of determining the resultant load vector by instrumenting supports to measure leg, canopy capsule and curved link forces is under development. The concept has been laboratory tested in a mine roof simulator. Lack of suitable instrumentation has, to date, prevented validation under longwall conditions. It is thought that the studies will provide an advancement in state-of-the-art longwall roof support and provide a basis for studies on improved support design.
862176 Interaction of powered supports and the strata in coal seams under a heavy roof Budirsky, S Int J Min Engng V3, N2, July 1985, P113-138
See also: 862054
The interaction of powered supports and the strata in thick coal seams under a heavy roof, when subjected to anomalous phenomena, is discussed. In particular, rock bursts, which have occurred in the Upper Silesian Coal Basin in the last few years, are considered. On the basis of the results of long-term field measurements and theoretical analyses, the necessary setting and yield loads of powered supports, as well as the loading patterns which appear during rock bursts, have been determined. A methodology for the testing of powered supports destined for coal seams prone to rock bursts, which requires the building of a rapid closure rig, is proposed. 862177 Chinese approach to tunnel support Cai, W W; Li, S 2 Tunn Tunnlg V17, N7, July 1985, P30-37 The principles of the NATM, rockbolts and shotcrete support, have been successfully applied in China to cavern and tunnel excavation in poor geological conditions. The problems of achieving quicker, safer and more economical results in the construction of underground works for hydroelectric power stations are considered and presented. They are based primarily on experience with such projects in China, as well as experience abroad of the principles and use of the NATM. 0
Grouting
862180 Chemical grouting - 2 Littlejohn, G S Ground Engng V18, N3. April 1985, P23-28 Topics covered include: grout selection; viscosity; setting time; stability; strength of grouted formations; creep of grouted formations; resistance of grout to extrusion; permeability of grouted formations; penneance; and health and safety aspects. 862181 Chemical grouting - 3 Littlejohn, G S Ground Engng VI8. N4, May 1985. P29-34 Grouting operations are examined. Each case is influenced by ground conditions and the degree of control required for grout placement into different zones. Importance of grout monitoring is emphasised. Case records are described from dams, tunnels, drifts and shafts, excavations and underpinning, illustrating that chemical grouting is well established for impermeabilisation and strengthening of the ground. 64 refs. 862182 Chemical grouting in soils permeated by water Krizek, R J; Perez, T J Geotech Engng Div ASCE VII 1. N7, July 1985, P898-915 Using data from seventy-nine large scale one dimensional laboratory tests,limiting conditions were established to define the transition zone between retention and elutriation of chemical
1986 Pergamon Press Ltd. Reproduction
not permitted