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Integrity testing of piles by stress wave measurements
195A 923436 Analysis on permanent deformation of embankments caused by
earthquakes
Kuwano, J; Ishihara, K; Haya, H; Izu, F Soils Found V31, N3, Sept 1991, P97-110 A technique for prediction of earthquake induced permanent deformation is presented. Static and dynamic finite element analyses are first used to estimate the stress conditions before and during the earthquake. The constructional soils are then subjected to laboratory simulation of these conditions. Moduli of the soils are modified according to residual strain potential at each position in the embankment, and residual deformations evaluated. The technique has been applied to two case histories. In one, predicted settlement was 270ram, observed settlement 210ram. At the other, where failure occurred, predicted residual deformation was 1.81m. 923437 Earthquake response of offshore structures Bai, Y; Pedersen, P T Proc lOth lmernational Conference on Offshore Meekanics and Arctic Engineering, Stavanger, 23-28 June 1991 VJ-Part B, P571-578. Publ New York: ASME, 1991 Bottom supported structures may experience seismic loadings which induce deformations well into the plastic range. Time domain solutions to the development of these deformations are presented. A procedure for dynamic analysis of three dimensional frames with geometric and material nonlinearities is used. It gives accurate results and requires relatively low input data preparation effort. Both geometrical and material nonlinearities have significant influences. Foundation stiffness effects are very important, whilst hydrodynamic damping effects associated with drag forces are small. 923438 Stability of slopes under earthquake condition by method of
characteristics Siva Reddy, A; Karibasappa, S Proc Indian Geotedmieal Conference, 1989, Geoteekniques of Problematic Soils mid Rocks, VisakhopatMm, 14-16 December 1989 V1, P445-449. Publ New Delhi: Sarita Prakashan, 1989 Stability analysis of a slope of a rigid plastic, Mohr-Coulomb soil is undertaken using the equivalent static force (ESF) method and the method of characteristics. In the ESF method, actual inertia forces of vibrating elements are replaced by equivalent horizontal static forces acting at the centre of each element. The seismic coefficient is the ratio of ESF to element weight. The mobilised angle of internal friction is taken as a variable of coordinates in the equations along the characteristics. Contours of mobilised friction angle are obtained, and numerical results presented in the form of stability charts. 923439 Integrity testing of piles by stress wave measurements Bhandari, R K; Prakash, P; Rastogi, P C; Sharma, A K Proc imtian Geoteclmical CoRference, 1989, Geotecludqavs of Problematic Soils nad Rocks, gisakhopmNm, 14-16 December 1989 V], P485-489. Publ New Delhi: Sarita Prakashan, 1989 The low strain integrity testing method for piles, based on stress wave analysis, has been successfully used around the world. The principle and methodology are described and field test results using modern, portable, computerised testing equipment, the Foundation Pile Diagnostic System (FPDS), are presented. The method can be used for precast or east-insitu piles, is quick and reliable, and fit for use shortly after pile construction.
Underground Excavations 923440 Atlas of rock engineering mechanisms: underground investigations. Technical note Hudson, J A lnt Y Rock Mech Min Sci V28, N6, Nov 1991, P523-526 The REMIT (Rock Engineering Mechanisms Information Technology) approach which aims to integrate rock properties and rock mechanics and rock engineering mechanisms such that their interactions can be easily examined and understood is presented. The Atlas of Rock Engineering Mechanisms is illustrated for the case of underground excavations. It is in the form of a 12x12 matrix, with the key parameters as the leading diagonal: excavation dimensions, rock support, depth of excavation, excavation methods, rock mass quality, discontinuity geometry, rock mass structure, in situ stress, intact rock quality, rock behaviour, discontinuity aperture, and hydraulic conditions. Similar matrices are under production for slopes, foundations, and case studies.
Geological factors of importance in underground excavations 923441 Innovative approach to peak gas storage in large urban areas - a hard rock natural gas cavern in New York City Hoffman, C M; Lange, R B Proc lntermmtiomd Comferemce on Storage of Gases in Rock Caverns, Tromlhohn, 26-28 June 1989 P323-335. Publ Rotterdam: A A Balkema, 1989 A geotechnical test program for the construction of natural gas storage caverns in hard rock is presented. The program began with studies to identify a suitable site. On this site, the investigations included lithological studies, rock mass characterisation, drilfing program, hydrologic formation testing, and compressed air/nitrogen testing for rechecking hydrological properties. Geophysical and borehole logging and laboratory tests were carried out. Preliminary cavern design is described.
923442 Performance of Ramganga Tunnel during its construction - a case study Mehrota, V K; Mitra, S
Proc Indian Geoteelmicai Conference, 1989, GeoteclmiqKs of Problematic Soils u d Rocks, glsakhopatum, 14-16 December 1989 VI, P505-508. Publ New Delhi: Sarita Prakashan, 1989 Tunnels constructed for the hydroplant on the Ramganga river in Uttar Pradesh are discussed. They pass through alternate bands of sandstone and clayshale which were seen to be soft and in poor condition during driving of a pilot bore. Modified multiple drift heading construction was used to minimise overbreak problems. Remedial measures suitable to overcome problems before and during construction in Himaiyan conditions are discussed. These include extensive use of instrumentation and rock mechanics principles, use of tunnelling machines or NATM wherever possible, and minimising blast damage using controlled blasting techniques.
© 1992 Pergamon Press Ltd. Reproduction not
permitted
earthquakes
Kuwano, J; Ishihara, K; Haya, H; Izu, F Soils Found V31, N3, Sept 1991, P97-110 A technique for prediction of earthquake induced permanent deformation is presented. Static and dynamic finite element analyses are first used to estimate the stress conditions before and during the earthquake. The constructional soils are then subjected to laboratory simulation of these conditions. Moduli of the soils are modified according to residual strain potential at each position in the embankment, and residual deformations evaluated. The technique has been applied to two case histories. In one, predicted settlement was 270ram, observed settlement 210ram. At the other, where failure occurred, predicted residual deformation was 1.81m. 923437 Earthquake response of offshore structures Bai, Y; Pedersen, P T Proc lOth lmernational Conference on Offshore Meekanics and Arctic Engineering, Stavanger, 23-28 June 1991 VJ-Part B, P571-578. Publ New York: ASME, 1991 Bottom supported structures may experience seismic loadings which induce deformations well into the plastic range. Time domain solutions to the development of these deformations are presented. A procedure for dynamic analysis of three dimensional frames with geometric and material nonlinearities is used. It gives accurate results and requires relatively low input data preparation effort. Both geometrical and material nonlinearities have significant influences. Foundation stiffness effects are very important, whilst hydrodynamic damping effects associated with drag forces are small. 923438 Stability of slopes under earthquake condition by method of
characteristics Siva Reddy, A; Karibasappa, S Proc Indian Geotedmieal Conference, 1989, Geoteekniques of Problematic Soils mid Rocks, VisakhopatMm, 14-16 December 1989 V1, P445-449. Publ New Delhi: Sarita Prakashan, 1989 Stability analysis of a slope of a rigid plastic, Mohr-Coulomb soil is undertaken using the equivalent static force (ESF) method and the method of characteristics. In the ESF method, actual inertia forces of vibrating elements are replaced by equivalent horizontal static forces acting at the centre of each element. The seismic coefficient is the ratio of ESF to element weight. The mobilised angle of internal friction is taken as a variable of coordinates in the equations along the characteristics. Contours of mobilised friction angle are obtained, and numerical results presented in the form of stability charts. 923439 Integrity testing of piles by stress wave measurements Bhandari, R K; Prakash, P; Rastogi, P C; Sharma, A K Proc imtian Geoteclmical CoRference, 1989, Geotecludqavs of Problematic Soils nad Rocks, gisakhopmNm, 14-16 December 1989 V], P485-489. Publ New Delhi: Sarita Prakashan, 1989 The low strain integrity testing method for piles, based on stress wave analysis, has been successfully used around the world. The principle and methodology are described and field test results using modern, portable, computerised testing equipment, the Foundation Pile Diagnostic System (FPDS), are presented. The method can be used for precast or east-insitu piles, is quick and reliable, and fit for use shortly after pile construction.
Underground Excavations 923440 Atlas of rock engineering mechanisms: underground investigations. Technical note Hudson, J A lnt Y Rock Mech Min Sci V28, N6, Nov 1991, P523-526 The REMIT (Rock Engineering Mechanisms Information Technology) approach which aims to integrate rock properties and rock mechanics and rock engineering mechanisms such that their interactions can be easily examined and understood is presented. The Atlas of Rock Engineering Mechanisms is illustrated for the case of underground excavations. It is in the form of a 12x12 matrix, with the key parameters as the leading diagonal: excavation dimensions, rock support, depth of excavation, excavation methods, rock mass quality, discontinuity geometry, rock mass structure, in situ stress, intact rock quality, rock behaviour, discontinuity aperture, and hydraulic conditions. Similar matrices are under production for slopes, foundations, and case studies.
Geological factors of importance in underground excavations 923441 Innovative approach to peak gas storage in large urban areas - a hard rock natural gas cavern in New York City Hoffman, C M; Lange, R B Proc lntermmtiomd Comferemce on Storage of Gases in Rock Caverns, Tromlhohn, 26-28 June 1989 P323-335. Publ Rotterdam: A A Balkema, 1989 A geotechnical test program for the construction of natural gas storage caverns in hard rock is presented. The program began with studies to identify a suitable site. On this site, the investigations included lithological studies, rock mass characterisation, drilfing program, hydrologic formation testing, and compressed air/nitrogen testing for rechecking hydrological properties. Geophysical and borehole logging and laboratory tests were carried out. Preliminary cavern design is described.
923442 Performance of Ramganga Tunnel during its construction - a case study Mehrota, V K; Mitra, S
Proc Indian Geoteelmicai Conference, 1989, GeoteclmiqKs of Problematic Soils u d Rocks, glsakhopatum, 14-16 December 1989 VI, P505-508. Publ New Delhi: Sarita Prakashan, 1989 Tunnels constructed for the hydroplant on the Ramganga river in Uttar Pradesh are discussed. They pass through alternate bands of sandstone and clayshale which were seen to be soft and in poor condition during driving of a pilot bore. Modified multiple drift heading construction was used to minimise overbreak problems. Remedial measures suitable to overcome problems before and during construction in Himaiyan conditions are discussed. These include extensive use of instrumentation and rock mechanics principles, use of tunnelling machines or NATM wherever possible, and minimising blast damage using controlled blasting techniques.
© 1992 Pergamon Press Ltd. Reproduction not
permitted