- Email: [email protected]
Dynamics of large caverns
104A 882413 Int~mctiou of nulergroud ~ and sm'faee development in a centrai city en~rommlt Stacey, T R In: Rock Engineering and Excaation in a Urban Enviroumeat (papers to the ctmfereoce, Ho~g Kong, 24-27 February, 1986) P397-404. Publ London: IMM, 1986 Three significant reefs have been mined under central Johannesburg. Surface development above mined areas is restricted. Four subsidence mechanisms have been identified: sinkholes; cantilevered block subsidence;subsidence due to stope closure; and subsidence on a faulty dyke contact. Remedial and preventative measures include dynamic compaction, plugging of stopes and backfilling, and stabilising pillar installation. Risk of subsidence can be minimised by careful investigation and appropriate stabilisation measures. Developments across significant dyke contacts should be avoided. 8824 14 Development of base friction technique and its application to subsidence engineering Nishada, T; Esaki, T; Kameda, N Proc International Symposium on Engineering in Complex Rock Fornmtious, Beifing, 3-7 November, 1986 P386-392. Publ Beijing: Science Press. 1986 An improvement to the base friction apparatus, which can be used to simulate the effects of gravity in two dimensional scale model testing of excavations in rock, is described. Using a barytes based model material to simulate jointed and continuous rocks, the apparatus is used to study cave-in and surface subsidence above shallow coal mines. 882415 Relations between rockburst and surrounding rock stress in underground chambers - with a tentative gradation of rockburst intensity
Hou Faliang; Jia Yuru Proc International Symposium on Engineering in Complex Rock Formations, Beifing, 3-7 November, 1986 P497-505. Publ Beijing: Science Press, 1986 Rockburst and rock core discing at the Ertan hydropower plant site and data from other authors have been studied. Relations between rockburst and surrounding rock stress have been examined using photoelastic models and finite element analysis, and causes of rockburst analysed. Equations for rock core breaking onset stress, and for critical stress, and one relating core discing thickness and surrounding rock stress are derived, and a scheme for grading rockburst intensity proposed.
Influence of dynamic loads
surface structural damage show the relative superiority of underground structures in resisting seismic loading. Greater damage was seen in buildings founded on soils rather than rocks, due to the amplification of seismic motion in soils in the frequency band of structural interest. 882417 Soil-structure interaction effects on the reliability evaluation of reactor containments Pires, J; Hwang, H; Reich, M Proc Third US National Conference on Earthquake Engineering, Ckorleston, 24-28 August, 1986 VI, P529-539. Publ El Cerrito: Earthquake Engineering Research Institute. 1986 Using a probability based method, seismic reliability analysts is performed for an embedded reinforced concrete structure in the shape of a cylinder with a domed end. The effects of soil structure interaction on structural fragd'lities, floor response spectra, and correlation coefficients for total acceleration responses at specified structural locations are investigated. 882418 Estimation of stability of large-span caverns with regard to
seismic effects Chesnokov, S: Sheinman, L: Fotieva, N; Bulychev, N; Sammal. A Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August, 1986 V2, P1213-1222. Publ Oxford." Pergamon Press, 1986 An analysis is presented to calculate the size and shape of the plastic zone around an underground structure subject to earthquake Ioadings at intensities up to Richter scale 11. It includes the effects o ["in situ stress and depth of the cavern. It may be used to investigate the stability of unsupported caverns or to design cavern support. 882419 Dynamics of large caverns Howetls, D A Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August, 1986 I/2, P1275.1279. Pubt Oxford: Pergamon Press. 1986 The dynamic behaviour of caverns arises from transient wave excitations which may be natural or man-made. Little is known of the details of the free field motion, and studies are based on simple representations scaled to overall values. The interaction between free-field motion and the cavern is one of scattering. Different methods o f numerical analysis coupled at their boundaries may be used to develop tncreasingly realistic studies. It is generally thought that a well designed cavern provided a safer environment against earthquakes, but opposing considerations affect the design of details. Auth.
See also: 882228 882416 Performance of underground coal mines during the 1976
Tangshan earthquake Lee, C F Tunalg Undergromal Space Teehnol V2, N2, 1987, P199-202 Subsurface intensity profiles have been drawn up for the Tangshah earthquake. Damage in coal mines is correlated with earthquake intensity and drift structure. Comparisons with
© 1988 Pergamon Press pie. Reproduction not permitted
Hou Faliang; Jia Yuru Proc International Symposium on Engineering in Complex Rock Formations, Beifing, 3-7 November, 1986 P497-505. Publ Beijing: Science Press, 1986 Rockburst and rock core discing at the Ertan hydropower plant site and data from other authors have been studied. Relations between rockburst and surrounding rock stress have been examined using photoelastic models and finite element analysis, and causes of rockburst analysed. Equations for rock core breaking onset stress, and for critical stress, and one relating core discing thickness and surrounding rock stress are derived, and a scheme for grading rockburst intensity proposed.
Influence of dynamic loads
surface structural damage show the relative superiority of underground structures in resisting seismic loading. Greater damage was seen in buildings founded on soils rather than rocks, due to the amplification of seismic motion in soils in the frequency band of structural interest. 882417 Soil-structure interaction effects on the reliability evaluation of reactor containments Pires, J; Hwang, H; Reich, M Proc Third US National Conference on Earthquake Engineering, Ckorleston, 24-28 August, 1986 VI, P529-539. Publ El Cerrito: Earthquake Engineering Research Institute. 1986 Using a probability based method, seismic reliability analysts is performed for an embedded reinforced concrete structure in the shape of a cylinder with a domed end. The effects of soil structure interaction on structural fragd'lities, floor response spectra, and correlation coefficients for total acceleration responses at specified structural locations are investigated. 882418 Estimation of stability of large-span caverns with regard to
seismic effects Chesnokov, S: Sheinman, L: Fotieva, N; Bulychev, N; Sammal. A Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August, 1986 V2, P1213-1222. Publ Oxford." Pergamon Press, 1986 An analysis is presented to calculate the size and shape of the plastic zone around an underground structure subject to earthquake Ioadings at intensities up to Richter scale 11. It includes the effects o ["in situ stress and depth of the cavern. It may be used to investigate the stability of unsupported caverns or to design cavern support. 882419 Dynamics of large caverns Howetls, D A Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August, 1986 I/2, P1275.1279. Pubt Oxford: Pergamon Press. 1986 The dynamic behaviour of caverns arises from transient wave excitations which may be natural or man-made. Little is known of the details of the free field motion, and studies are based on simple representations scaled to overall values. The interaction between free-field motion and the cavern is one of scattering. Different methods o f numerical analysis coupled at their boundaries may be used to develop tncreasingly realistic studies. It is generally thought that a well designed cavern provided a safer environment against earthquakes, but opposing considerations affect the design of details. Auth.
See also: 882228 882416 Performance of underground coal mines during the 1976
Tangshan earthquake Lee, C F Tunalg Undergromal Space Teehnol V2, N2, 1987, P199-202 Subsurface intensity profiles have been drawn up for the Tangshah earthquake. Damage in coal mines is correlated with earthquake intensity and drift structure. Comparisons with
© 1988 Pergamon Press pie. Reproduction not permitted