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Behaviour of a coal pillar prone to burst in the Southern Appalachian Basin of the United States
270A 924500 Earth fissures and land subsidence of the Mimbres Basin, Southwestern New Mexico, U.S.A. Contaldo, G J; Mueller, J E
favoured preventative measures. Results of finite element analysis of a hypothetical project are presented to describe the ground movements with and without these treatments.
Proc 4th International Conference on Land Subsidence, Houston, 12-17 May 1991 P301-310. Publ IAHS Press. Wallingford. 1991
924504 Mechanism of outbursts in coal and the prevention of outbursts by gas drainage Paterson, L Proc 2nd International Symposium on Rockbarsts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P285-287. Publ Rotterdam: A A Balkema. 1990
Earth fissures have formed as a result of tensile failure of unconsolidated alluvium in the Mimbres Basin. They can be spatially associated with areas of water level decline. Total and annual average water level declines over the period 1910-1990 are 35m and 0.44m/yr respectively. Dating of the fissures also reveals temporal association with water level decline. Maximum land subsidence is coincident with greatest water level decline. The cause of fissuring and subsidence is suspected to be the compaction of unconsolidated alluvium due to dewatering of an unconfined aquifer. 924501 Bumps and rockbursts in Indian coal mines - an overview Ghose, A K
In: ROCKBURSTS, Global Experiences (Paper to the 5th Plenary Scientific Session of Working Group on Rockbursts of International Bureau of Strata Mechanics, Hyderabad, 2-3 February 1988) P123-129. Publ Rotterdam." A A Balkema, 1990
Outbursts are violent projections of coal and gas from newly exposed faces, resulting primarily from body forces associated with gas flow, although stresses from other sources may contribute. Coal faces are particularly burst-prone because of the great capacity of coal to absorb large quantities of methane and carbon dioxide. A simple analysis of gas burst and its mitigation by drainage is presented. Results indicate that hole diameter has little effect on flow rate and that applying a vacuum has negligible effect. 924505 Tectonic structures, strata properties and rockbursts occurrence in a French coal mine Gaviglio, P; Revalor, R; Piguet, J P; Dejean, M Proc 2nd International Symposium on Roekbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P289-293. Publ Rotterdam: A A Balkema. 1990
Rockburst and bumps have increased in India as mining has proceeded to greater depth. Many geotechnical parameters are known to influence these events. Current research in this field in India is described. A promising categorization method for liability to rockburst has been developed, based on the energy index of the coal (recoverable strain energy). A rockburst liability index might be derived considering roof conditions, depth and geometry of the excavation, geology, and tectonics. Microseismic monitoring for safety assessment is recommended. Preventative measures based on stress relief are suggested.
At the Provence colliery in France, a 2-3m thick shallowly dipping seam at depth up to 1000m is worked by longwalling with caving. Rockbursts have occurred in the past 15 years. Acoustic emission and seismic monitoring for prediction of rockburst and destressing boreholes for prevention are employed. Geologic and geotcchnical conditions have been studied to ascertain the features which, together with mining factors, may contribute to outburst. Tectonic structures and rock mechanical properties have been examined in detail.
924502 Knowledge of the geological hazard connected with underground cavities in urban areas. A case history Paglionico, A; Quarto, R; Schiavone, D Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P1973-1980. Publ Rotterdam: A A Balkema, 1990
924506 Behaviour of a coal pillar prone to burst in the Southern Appalachian Basin of the United States Iannacchione, A Proc 2nd International Symposium on Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P295-300. Publ Rotterdam: A A Balkema, 1990
The occurrence of subsidence, settlement, and sometimes collapse of engineering structures is a serious problem in the Apulian town of Canosa,Italy. The problem is due to prevalence of natural cavities (solution cavities, karst structures) and historical man-made cavities in calcarenitic and carbonate rocks of the town. A survey of the distribution of these cavities was carried out by the University of Bari using geological surface mapping and geophysical (resistivity) techniques.
The geology and the mining techniques used in the Southern Appalachian Basin are major contributors to the severe burst problems in deep longwall mines. A 24.4m square abutment pillar was instrumented and stress distribution and convergence studied. Failure strength, deformability, visco-elastic properties, and failure mechanisms have been examined. Field behaviour is compared to that predicted by empirical design formulae. Local geological conditions are seen to contribute significantly to the failure likelihood.
924503 Numerical estimation of the effectiveness of measures to stabilize the ground massive when tunnelling in the vicinity of buildings Bogdanova, M B; Savitsky, V V; Sbeynin, V I Proc Ninth Danube-European Conference on Soll Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P297-302. Publ Budapest." Akademiai Kiado, 1990
Proc 2nd International Symposium on Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P301-306. Publ Rotterdam: A A Balkema, 1990
When tunnelling in urban areas it is necessary to minimise ground movements which can damage surface structures. The finite element method is well suited to prediction of displacements within the soil mass and surface settlement due to soft ground tunnelling. Preliminary grouting of the soil mass or the construction of retaining walls of cast in situ piles are two
Long term seismic and seismo-acoustic monitoring has been carried out in French collieries to improve understanding and prediction of rockburst phenomena. The outburst mechanisms, monitoring of single faces and large scale networks, and interpretation of results are described. Event location and its relation to mining geometry, focal mechanisms and focal
924507 Seismic and seismoacoustics experiments applied to the prediction of rockbursts in French coal mines Revalor, R; Josien, J P; Besson, J C; Magron, A
,© 1992 Pergamon Press Ltd. Reproduction not permitted
favoured preventative measures. Results of finite element analysis of a hypothetical project are presented to describe the ground movements with and without these treatments.
Proc 4th International Conference on Land Subsidence, Houston, 12-17 May 1991 P301-310. Publ IAHS Press. Wallingford. 1991
924504 Mechanism of outbursts in coal and the prevention of outbursts by gas drainage Paterson, L Proc 2nd International Symposium on Rockbarsts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P285-287. Publ Rotterdam: A A Balkema. 1990
Earth fissures have formed as a result of tensile failure of unconsolidated alluvium in the Mimbres Basin. They can be spatially associated with areas of water level decline. Total and annual average water level declines over the period 1910-1990 are 35m and 0.44m/yr respectively. Dating of the fissures also reveals temporal association with water level decline. Maximum land subsidence is coincident with greatest water level decline. The cause of fissuring and subsidence is suspected to be the compaction of unconsolidated alluvium due to dewatering of an unconfined aquifer. 924501 Bumps and rockbursts in Indian coal mines - an overview Ghose, A K
In: ROCKBURSTS, Global Experiences (Paper to the 5th Plenary Scientific Session of Working Group on Rockbursts of International Bureau of Strata Mechanics, Hyderabad, 2-3 February 1988) P123-129. Publ Rotterdam." A A Balkema, 1990
Outbursts are violent projections of coal and gas from newly exposed faces, resulting primarily from body forces associated with gas flow, although stresses from other sources may contribute. Coal faces are particularly burst-prone because of the great capacity of coal to absorb large quantities of methane and carbon dioxide. A simple analysis of gas burst and its mitigation by drainage is presented. Results indicate that hole diameter has little effect on flow rate and that applying a vacuum has negligible effect. 924505 Tectonic structures, strata properties and rockbursts occurrence in a French coal mine Gaviglio, P; Revalor, R; Piguet, J P; Dejean, M Proc 2nd International Symposium on Roekbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P289-293. Publ Rotterdam: A A Balkema. 1990
Rockburst and bumps have increased in India as mining has proceeded to greater depth. Many geotechnical parameters are known to influence these events. Current research in this field in India is described. A promising categorization method for liability to rockburst has been developed, based on the energy index of the coal (recoverable strain energy). A rockburst liability index might be derived considering roof conditions, depth and geometry of the excavation, geology, and tectonics. Microseismic monitoring for safety assessment is recommended. Preventative measures based on stress relief are suggested.
At the Provence colliery in France, a 2-3m thick shallowly dipping seam at depth up to 1000m is worked by longwalling with caving. Rockbursts have occurred in the past 15 years. Acoustic emission and seismic monitoring for prediction of rockburst and destressing boreholes for prevention are employed. Geologic and geotcchnical conditions have been studied to ascertain the features which, together with mining factors, may contribute to outburst. Tectonic structures and rock mechanical properties have been examined in detail.
924502 Knowledge of the geological hazard connected with underground cavities in urban areas. A case history Paglionico, A; Quarto, R; Schiavone, D Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V3, P1973-1980. Publ Rotterdam: A A Balkema, 1990
924506 Behaviour of a coal pillar prone to burst in the Southern Appalachian Basin of the United States Iannacchione, A Proc 2nd International Symposium on Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P295-300. Publ Rotterdam: A A Balkema, 1990
The occurrence of subsidence, settlement, and sometimes collapse of engineering structures is a serious problem in the Apulian town of Canosa,Italy. The problem is due to prevalence of natural cavities (solution cavities, karst structures) and historical man-made cavities in calcarenitic and carbonate rocks of the town. A survey of the distribution of these cavities was carried out by the University of Bari using geological surface mapping and geophysical (resistivity) techniques.
The geology and the mining techniques used in the Southern Appalachian Basin are major contributors to the severe burst problems in deep longwall mines. A 24.4m square abutment pillar was instrumented and stress distribution and convergence studied. Failure strength, deformability, visco-elastic properties, and failure mechanisms have been examined. Field behaviour is compared to that predicted by empirical design formulae. Local geological conditions are seen to contribute significantly to the failure likelihood.
924503 Numerical estimation of the effectiveness of measures to stabilize the ground massive when tunnelling in the vicinity of buildings Bogdanova, M B; Savitsky, V V; Sbeynin, V I Proc Ninth Danube-European Conference on Soll Mechanics and Foundation Engineering, Budapest, 2-5 October 1990 P297-302. Publ Budapest." Akademiai Kiado, 1990
Proc 2nd International Symposium on Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P301-306. Publ Rotterdam: A A Balkema, 1990
When tunnelling in urban areas it is necessary to minimise ground movements which can damage surface structures. The finite element method is well suited to prediction of displacements within the soil mass and surface settlement due to soft ground tunnelling. Preliminary grouting of the soil mass or the construction of retaining walls of cast in situ piles are two
Long term seismic and seismo-acoustic monitoring has been carried out in French collieries to improve understanding and prediction of rockburst phenomena. The outburst mechanisms, monitoring of single faces and large scale networks, and interpretation of results are described. Event location and its relation to mining geometry, focal mechanisms and focal
924507 Seismic and seismoacoustics experiments applied to the prediction of rockbursts in French coal mines Revalor, R; Josien, J P; Besson, J C; Magron, A
,© 1992 Pergamon Press Ltd. Reproduction not permitted