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Interaction of compaction near mine openings and drainage of pore fluids from coal seams
94A 843121 Revised concept of the water pressure test (In German) Schneider, N J Proc 5th Congress of the International Society for Rock Medmm'cs, Melbourne, 10-15 April 1983 V1, PB125-B130. Publ Rotterdam." A. A. Balkema, 1983 The accuracy of measurement in the revised test procedure is improved by the use of electrical pressure sensors in the pressure segment of the drilling hole, the use of inductive flow-meters, as well as the recording of measuring data by analogue or digital processes of identical accuracy. The control of the experiment by means of a constant quantity under pressure and intervals of equal time between the various stages of the pressure test enable the porosity to be determined through processes which correspond to actual flow conditions.
Underground Excavations See also: 843070, 843100 843122 Dynamic computational analysis of openings in jointed rock Dowding, C H; Belytschko, T B; Yen, H J J Geotech Engng Die ASCE VI09, NGT12, Dec 1983, P1551-1566 Procedures for the transient analysis of openings in jointed rock are developed and applied to several problems. The rock masses are modelled by rigid blocks with edge-to-edge interaction at joints and are coupled to surrounding finite elements for transmission of waves to the opening. Studies of the dynamic response of caverns show that failing blocks slide intermittently and displace the most when shear wave lengths are about twice the cavern height. Auth. 843123 Effects of surface loads on buried vitrified clay pipes Bland, C E G Water Serv V87, N1050, Aug 1983, P369-375 Experiments were carried out in a purpose-built facility to examine the influence of surface loads on pressure cells buried in the ground above various diameters of vitrified clay pipes lain on different beddings. The results indicate that the Newmark Integration of the Boussinesq equation gives a good approximation of the mean pressures measured above a 100mm pipeline at all depths of cover. As pipe size increased, so did the difference between measured and theoretical results.
Mines See also: 843019, 843099, 843108, 843169, 843173, 843178, 843179, 843181, 843190 843124 State of deformation of a rockmass overlying the exploitation field of a bedded deposit Szpetkowski, S Arch Garn V28, N2, 1983, P199-219 The displacements of points in a rock mass overlying a mining excavation area are due to deformations usually determined in two horizontal directions and in the vertical direction. A mathematical method is developed for the determination of values more closely representing the actual state of deformation and examples of its application are given.
843125 Principles for safeguarding the face area when driving through roof rockbursts (In Polish) Bilinski, A Arch Gorn V28, N2, 1983, P275-291 Describes an investigation into caved and hydraulically stowed faces in which a number of characteristic factors were derived for fissured strata from which an approximate empirical model was developed. The method can also be used to predict roof behaviour at a given support yield value in longwall faces unaffected by rock bursts, or, conversely for the calculation of the support strength necessary to stabilize the roof. 843126 Determining rock burst hazard of coal seams in the Kuzbass on the basis of higher hydrocarbon content in coal Taran, N P; Rozantseva, N N Bezopasnost Tr Prom-st Nil, Nov 1982, P59-60 Analyses of investigations in the Kuzbass coalfield, Poland, show that rock burst hazard increases with increasing content of higher hydrocarbons. For volatile matter contents in the range 14-33% and higher hydrocarbon contents greater than 0.01cu m/ton, seams are liable to rock bursts. Where the higher hydrocarbon contents lie between 0.0-1 and 0.004cu m/ton the seams are prone to coal and gas outbursts. Rock bursts are not a hazard in seams where the higher hydrocarbon content is less than 0.004cu m. 843127 Pumping colliery spoil to backfill mine workings Hills, D L; Ward, W H Building Research Establishment News N60, Summer 1983, P7 A pilot investigation has been carried out to assess the feasibility of backfilling old mine workings with colliery spoil transported by pipeline and injected using concrete pumping equipment. 843128 Interaction of compaction near mine openings and drainage of pore fluids from coal seams Smelser, R E; Richmond, O; Schwerer, F C int J Rock Meeh Min Sci V21, NI, Feb 1984, P13-20 A model is presented which describes the interaction of nonlinear compaction of coal seams with drainage ofcoal seam pore fluids. One result of the model is a predicted increase with time in the extent of the plastic or yielded zone adjacent to a stationary mine face due to drainage of pore fluids into the mine workings. 843129 Prediction of roof conditions through geotechnical studies - an approach Venkateswarlu, V J Min Met Fuels V31, N3, March 1983, P94-100 Geomechanical classification of geological and structural features represents a semi-quantitative approach to the assessment of their influence on roof stability. The parameters: rock quality designation, rock strength, weatherability, ground water and structural features are identified and mine roof strata are classified by assigning ratings to them. On the basis of the classification suitable roof support measures can be adopted, and following standardisation roof conditions can be forecast for unexplored areas of the mine.
Underground Excavations See also: 843070, 843100 843122 Dynamic computational analysis of openings in jointed rock Dowding, C H; Belytschko, T B; Yen, H J J Geotech Engng Die ASCE VI09, NGT12, Dec 1983, P1551-1566 Procedures for the transient analysis of openings in jointed rock are developed and applied to several problems. The rock masses are modelled by rigid blocks with edge-to-edge interaction at joints and are coupled to surrounding finite elements for transmission of waves to the opening. Studies of the dynamic response of caverns show that failing blocks slide intermittently and displace the most when shear wave lengths are about twice the cavern height. Auth. 843123 Effects of surface loads on buried vitrified clay pipes Bland, C E G Water Serv V87, N1050, Aug 1983, P369-375 Experiments were carried out in a purpose-built facility to examine the influence of surface loads on pressure cells buried in the ground above various diameters of vitrified clay pipes lain on different beddings. The results indicate that the Newmark Integration of the Boussinesq equation gives a good approximation of the mean pressures measured above a 100mm pipeline at all depths of cover. As pipe size increased, so did the difference between measured and theoretical results.
Mines See also: 843019, 843099, 843108, 843169, 843173, 843178, 843179, 843181, 843190 843124 State of deformation of a rockmass overlying the exploitation field of a bedded deposit Szpetkowski, S Arch Garn V28, N2, 1983, P199-219 The displacements of points in a rock mass overlying a mining excavation area are due to deformations usually determined in two horizontal directions and in the vertical direction. A mathematical method is developed for the determination of values more closely representing the actual state of deformation and examples of its application are given.
843125 Principles for safeguarding the face area when driving through roof rockbursts (In Polish) Bilinski, A Arch Gorn V28, N2, 1983, P275-291 Describes an investigation into caved and hydraulically stowed faces in which a number of characteristic factors were derived for fissured strata from which an approximate empirical model was developed. The method can also be used to predict roof behaviour at a given support yield value in longwall faces unaffected by rock bursts, or, conversely for the calculation of the support strength necessary to stabilize the roof. 843126 Determining rock burst hazard of coal seams in the Kuzbass on the basis of higher hydrocarbon content in coal Taran, N P; Rozantseva, N N Bezopasnost Tr Prom-st Nil, Nov 1982, P59-60 Analyses of investigations in the Kuzbass coalfield, Poland, show that rock burst hazard increases with increasing content of higher hydrocarbons. For volatile matter contents in the range 14-33% and higher hydrocarbon contents greater than 0.01cu m/ton, seams are liable to rock bursts. Where the higher hydrocarbon contents lie between 0.0-1 and 0.004cu m/ton the seams are prone to coal and gas outbursts. Rock bursts are not a hazard in seams where the higher hydrocarbon content is less than 0.004cu m. 843127 Pumping colliery spoil to backfill mine workings Hills, D L; Ward, W H Building Research Establishment News N60, Summer 1983, P7 A pilot investigation has been carried out to assess the feasibility of backfilling old mine workings with colliery spoil transported by pipeline and injected using concrete pumping equipment. 843128 Interaction of compaction near mine openings and drainage of pore fluids from coal seams Smelser, R E; Richmond, O; Schwerer, F C int J Rock Meeh Min Sci V21, NI, Feb 1984, P13-20 A model is presented which describes the interaction of nonlinear compaction of coal seams with drainage ofcoal seam pore fluids. One result of the model is a predicted increase with time in the extent of the plastic or yielded zone adjacent to a stationary mine face due to drainage of pore fluids into the mine workings. 843129 Prediction of roof conditions through geotechnical studies - an approach Venkateswarlu, V J Min Met Fuels V31, N3, March 1983, P94-100 Geomechanical classification of geological and structural features represents a semi-quantitative approach to the assessment of their influence on roof stability. The parameters: rock quality designation, rock strength, weatherability, ground water and structural features are identified and mine roof strata are classified by assigning ratings to them. On the basis of the classification suitable roof support measures can be adopted, and following standardisation roof conditions can be forecast for unexplored areas of the mine.