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Subsidence control measures
142A mining operations for coal extraction. 844177 Behaviour of rocks around large caverns during excavation Hibino, S; Motojima, M; Kanagawa, T Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V2, PD199-D202. Publ Rotterdam: A. A. Balkema, 1983 At 12 sites of large caverns for underground power stations the mechanical properties of the rock foundation were determined by in situ tests including jack tests, rock shearing tests, creep tests and overcoring. It was concluded that: (1)joint openings play a great role in rock displacement, (2) stresses in arched concrete linings do not depend on the horizontal stress of ground pressure but on the horizontal displacements of cavern walls and (3) in the relaxed zones, properties of the rock mass are degraded, and changes in the Lugeon value and in the velocity of the elastic wave are observed.
Evaluates monitoring methods which could be used to improve backfill monitoring technology. 844182 Measurement of coal mining subsidence - an example Bullock, K P
Min Mag V150, N4, April 1984, P379-384 Using the Electronic Distance Measurement system, subsidence was measured at the Kinsley Drift Mine, West Yorkshire, UK. Results showed that with this system subsidence can be measured to better than plus or minus 5ram and strains to better than 0.2mm/m with a minimum of time spent on field observation. 844183 Microgravimetric measurements for the prediction of subsidence in mining areas (In German) Fajklewicz, Z
Neue Bergbautech V13, Nt, June 1983, P312-316 844178 Study on rockbursts at the face of a deep tunnel, the Kanetsu Tunnel in Japan being an example Saito, T; Tsukada, K; Inami, E; Inoma, H; Ito, Y Proc 5th Congress of the International Society for Rock
Mechanics, Melbourne, 10-15 April 1983 V2, PD203-D206. Publ Rotterdam: A. A. Balkema, 1983 In the 1000m deep, 10,885m long Kan-Etsu Tunnel, Japan, driven through quartz diorite and hornfels, serious rock bursts occurred mainly at the tunnel face. The results of in situ tests stress analysis, initial rock stress measurements and stress change measurements ahead of the face - showed rock bursts to be due to brittle fracture caused by high stress concentration just ahead of the face. Areas of observed core disking corresponded with those of rock bursts. Rock bolting was found effective against the hazard.
Surface subsidence and caving See also: 844224 844179 Room and pillar coal mine ml~dence Elifrits, C D; Barr, D J; Aughenbaugh, N B
lat J Min Engng V1, N4, Dec 1983, P295-314 A geographic, natural resources computer database was modified to accept data files created from subsurface geological information, mining information, and remote sensor data. The database files were then used as variables in equations produced to represent relationships among the mapped parameters geological and mining - which identify areas prone to subside, as determined from field verified subsidence features. Also, the use of computer-processed remote sensor data as a tool for indication of subsided areas is evaluated. Auth. 844180 Subsidence control measures Chen, C Y
Min Engng V35, NIl, Nov 1983, P1547-1551 Discusses the mechanics of subsidence and the effects of subsidence on ground features. Measures used to minimize the possibility of damage to surface structures as a result of subsidence due to underground coal mining are summarized. 844181 Monitoring bUmi ~ in aba__ndmted mines Thill, R E; Hack, P J; Stegman, G
Min Engng V35, N12, Dec 1983, P1625-1630
Measurements were made above an abandoned underground coal mine with the extracted seam at a depth of 27-45m where sudden ground subsidence had occurred. Microgravimetric anomalies showed the location of underground voids and zones of loose ground. 844184 Some observations of the use of stochastic methods for the prediction of subsidence over Iongwall panels Glossop, N H In: Strata Mechanics (paper to the Symposium on Strata
Mechanics, Newcastle upon Tyne, 5-7 April 1982) P59-62. Publ Amsterdam: Elsevier, 1982 The paper describes briefly the stochastic method of subsidence prediction. Volume and trough width parameters are derived from the Subsidence Engineers Handbook to fit this model and thus enable a direct comparison to be made between the Handbook's empirical troughs and those predicted stochastically. This comparison indicates that the stochastic method does not accurately predict the shape of the settlement trough. Auth. 844185 Effect of mining subsidence on near surface underground structures Litwinowicz, L; Klosek, K In: Strata Meclumics (paper to the Symposium on Strata Mecimm'cs, Newcastle upon Tyne, 5-7 April 1982) P220-222.
Publ Amsterdam: Elsevier, 1982 The effect on communication tunnels of horizontal tensile deformations perpendicular to the tunnel axis has been examined. A general hypothesis for vertical and horizontal pressures has been developed. 844186 Subsidence behaviour of coal measures above bord and pillar workings Saxena, N C; Singh, B In: Strata Meclmsics (paper to the Symposhun on Strata
Meclmsics, Newcastle upon Tyae, 5-7 April 1982) P283-285. Pubi Amsterdam: Elsevier, 1982 The angle of draw in Indian coalfields is positive and varies between 4 and 31 deg. The non-effective width varies between 0.3 and 1.0 times the depth. It has not been possible to establish general relationships between different subsidence parameters and there is a need for further and more detailed investigations. Safe limits of surface slope and strains for various categories of surface features and structures are proposed.
Evaluates monitoring methods which could be used to improve backfill monitoring technology. 844182 Measurement of coal mining subsidence - an example Bullock, K P
Min Mag V150, N4, April 1984, P379-384 Using the Electronic Distance Measurement system, subsidence was measured at the Kinsley Drift Mine, West Yorkshire, UK. Results showed that with this system subsidence can be measured to better than plus or minus 5ram and strains to better than 0.2mm/m with a minimum of time spent on field observation. 844183 Microgravimetric measurements for the prediction of subsidence in mining areas (In German) Fajklewicz, Z
Neue Bergbautech V13, Nt, June 1983, P312-316 844178 Study on rockbursts at the face of a deep tunnel, the Kanetsu Tunnel in Japan being an example Saito, T; Tsukada, K; Inami, E; Inoma, H; Ito, Y Proc 5th Congress of the International Society for Rock
Mechanics, Melbourne, 10-15 April 1983 V2, PD203-D206. Publ Rotterdam: A. A. Balkema, 1983 In the 1000m deep, 10,885m long Kan-Etsu Tunnel, Japan, driven through quartz diorite and hornfels, serious rock bursts occurred mainly at the tunnel face. The results of in situ tests stress analysis, initial rock stress measurements and stress change measurements ahead of the face - showed rock bursts to be due to brittle fracture caused by high stress concentration just ahead of the face. Areas of observed core disking corresponded with those of rock bursts. Rock bolting was found effective against the hazard.
Surface subsidence and caving See also: 844224 844179 Room and pillar coal mine ml~dence Elifrits, C D; Barr, D J; Aughenbaugh, N B
lat J Min Engng V1, N4, Dec 1983, P295-314 A geographic, natural resources computer database was modified to accept data files created from subsurface geological information, mining information, and remote sensor data. The database files were then used as variables in equations produced to represent relationships among the mapped parameters geological and mining - which identify areas prone to subside, as determined from field verified subsidence features. Also, the use of computer-processed remote sensor data as a tool for indication of subsided areas is evaluated. Auth. 844180 Subsidence control measures Chen, C Y
Min Engng V35, NIl, Nov 1983, P1547-1551 Discusses the mechanics of subsidence and the effects of subsidence on ground features. Measures used to minimize the possibility of damage to surface structures as a result of subsidence due to underground coal mining are summarized. 844181 Monitoring bUmi ~ in aba__ndmted mines Thill, R E; Hack, P J; Stegman, G
Min Engng V35, N12, Dec 1983, P1625-1630
Measurements were made above an abandoned underground coal mine with the extracted seam at a depth of 27-45m where sudden ground subsidence had occurred. Microgravimetric anomalies showed the location of underground voids and zones of loose ground. 844184 Some observations of the use of stochastic methods for the prediction of subsidence over Iongwall panels Glossop, N H In: Strata Mechanics (paper to the Symposium on Strata
Mechanics, Newcastle upon Tyne, 5-7 April 1982) P59-62. Publ Amsterdam: Elsevier, 1982 The paper describes briefly the stochastic method of subsidence prediction. Volume and trough width parameters are derived from the Subsidence Engineers Handbook to fit this model and thus enable a direct comparison to be made between the Handbook's empirical troughs and those predicted stochastically. This comparison indicates that the stochastic method does not accurately predict the shape of the settlement trough. Auth. 844185 Effect of mining subsidence on near surface underground structures Litwinowicz, L; Klosek, K In: Strata Meclumics (paper to the Symposium on Strata Mecimm'cs, Newcastle upon Tyne, 5-7 April 1982) P220-222.
Publ Amsterdam: Elsevier, 1982 The effect on communication tunnels of horizontal tensile deformations perpendicular to the tunnel axis has been examined. A general hypothesis for vertical and horizontal pressures has been developed. 844186 Subsidence behaviour of coal measures above bord and pillar workings Saxena, N C; Singh, B In: Strata Meclmsics (paper to the Symposhun on Strata
Meclmsics, Newcastle upon Tyae, 5-7 April 1982) P283-285. Pubi Amsterdam: Elsevier, 1982 The angle of draw in Indian coalfields is positive and varies between 4 and 31 deg. The non-effective width varies between 0.3 and 1.0 times the depth. It has not been possible to establish general relationships between different subsidence parameters and there is a need for further and more detailed investigations. Safe limits of surface slope and strains for various categories of surface features and structures are proposed.