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Applicability of analytical methods for seabed response to ocean waves
230A increasing pumping of wave energy into the region, in turn causing the region to grow. A substantial increase in mean pore pressure above hydrostatic results, causing liquefaction.
934185 Applicability of analytical methods for seabed response to ocean
waves
Miura, K; Hayashi, M; Yoshida, N
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 V1, P609-614. Publ Japan." Coastal Development Institute of Technology. 1991 Three different types of coupled analysis, static, pseudo-static, and dynamic, are compared as to their ability to describe the variations in porewater pressure and deformation of a seabed subject to wave loading. The methods are assessed by parametric analysis. The static and quasi-static methods are found to have limitations, and in certain cases it is necessary to use dynamic analysis. Dynamic analysis incorporated in the finite element method is seen to satisfactorily replicate fieldobserved pore pressure variations.
934188 Dynamic solution of poroelastic column and borehole problems of soil and rock mechanics Beskos, D E; Vgenopoulou, I
Proc Fifth International Conference on Soil Dynamics and Earthquake Engineering, Karlsruhe, 23-26 September 1991 P731-741. Publ Southampton." Computational Mechanics Publications, 1991 The one dimensional dynamic column and borehole problems are solved analytically-numerically. The isotropic poroelastic soil and saturated, isotropic, fissured poroelastic rock are described by Vardoulakis-Beskos and Afiantis-Beskos models respectively. Laplace transforms with respect to time are used to reduce the problems to ordinary differential equations with constant (column) and variable (borehole) coefficients. Numerical results are presented to illustrate the importance of various dynamic and material parameters to the response.
Identification and classification 934189 Geomechanics characterization methodologies: a matrix approach (In Italian and English) Castelli, E
Gallerie V14, N38, 1992. P13-25
934186 Finite element analysis of liquefaction of seabed due to wave action Oka, F; Yashima, A; Shibata, T; Kato, M
Proc International Conference on Geoteclmical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 V1, P621-626. Publ Japan." Coastal Development Institute of Technology, 1991 A newly developed finite element code, LIQCA, with a cyclic elastoplastic constitutive model to represent a cohesionless seabed, is used in analysis of wave-induced seabed liquefaction. The finite element formulation is presented and its accuracy assessed against analytical solutions. Effects of water depth, seabed slope, and permeability on the induced porewater pressures, shear stresses, and ground movements are investigated.
934187 Wave-induced transient porewater pressure and seabed instability in surf zone Sakai, T; Hattori, A; Hatanaka, K
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 VI, P627-632. Publ Japan." Coastal Development Institute of Technology, 1991 The applicability of the boundary layer approximation solution of Mei and Foda (1981) to describe seabed pore pressure in the surf zone is first demonstrated. The solution is then modified to take into account the wave-induced bottom shear and applied to estimate the right hand side of the momentum equation for the solid skeleton under breaking waves. The instability proposed by Madsen (1974) is discussed with reference to these results. It is suggested that instability is more likely just after passage of the wave crest than just before, as the horizontal gradient of pore pressure is large and the vertical effective stress small in the former case.
The application of rock mass classification in engineering design is examined. Three commonly used methods (RSR, RMR, Q) are outlined and their parameters and classification structures reviewed. Consideration of discontinuity frequency and size effects in rock engineering are included. A new classification concept is proposed, using a weighted engineering matrix and a universal rock mass evaluation, according to Hudson's interaction matrix approach. These ideas are illustrated for the case of underground engineering design. 934190 Engineering geological characterization of weak rocks: classification, sampling and testing Clerici, A
Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P179-184. Publ London: Thomas Tel]brd, 1992 A classification system for weak rocks developed during mapping of large areas of Italy is presented. Because of the many types of weak rock and numerous causes of weakness, initial subdivision based on lithologic characteristics is proposed: soft rocks; stratified rocks with low strength layers; fractured rocks; chaotic rocks; weathered rocks; and swelling rocks. The many techniques for sampling and laboratory testing of rocks are tabulated, and those suitable for weak rocks indicated. The importance of including field tests in characterising heterogeneous weak rock masses is emphasised. 934191 Development of a roof and floor classification applicable to collieries Buddery, P; Oldroyd, D C
Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P197-202. Publ London: Thomas Tel/brd, 1992 Coal measures strata are frequently laminated, generally weak, and variable in character: coal mining typically involves rapid excavation and large areas of unsupported roof. Because of these features, rock classification systems specific to coal mines are desirable. Such systems should be based on measurements made on large numbers of samples using methods which reflect likely modes of strata control problem. The systems
© 1993 Pergamon Press Ltd. Reproduction not permitted
934185 Applicability of analytical methods for seabed response to ocean
waves
Miura, K; Hayashi, M; Yoshida, N
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 V1, P609-614. Publ Japan." Coastal Development Institute of Technology. 1991 Three different types of coupled analysis, static, pseudo-static, and dynamic, are compared as to their ability to describe the variations in porewater pressure and deformation of a seabed subject to wave loading. The methods are assessed by parametric analysis. The static and quasi-static methods are found to have limitations, and in certain cases it is necessary to use dynamic analysis. Dynamic analysis incorporated in the finite element method is seen to satisfactorily replicate fieldobserved pore pressure variations.
934188 Dynamic solution of poroelastic column and borehole problems of soil and rock mechanics Beskos, D E; Vgenopoulou, I
Proc Fifth International Conference on Soil Dynamics and Earthquake Engineering, Karlsruhe, 23-26 September 1991 P731-741. Publ Southampton." Computational Mechanics Publications, 1991 The one dimensional dynamic column and borehole problems are solved analytically-numerically. The isotropic poroelastic soil and saturated, isotropic, fissured poroelastic rock are described by Vardoulakis-Beskos and Afiantis-Beskos models respectively. Laplace transforms with respect to time are used to reduce the problems to ordinary differential equations with constant (column) and variable (borehole) coefficients. Numerical results are presented to illustrate the importance of various dynamic and material parameters to the response.
Identification and classification 934189 Geomechanics characterization methodologies: a matrix approach (In Italian and English) Castelli, E
Gallerie V14, N38, 1992. P13-25
934186 Finite element analysis of liquefaction of seabed due to wave action Oka, F; Yashima, A; Shibata, T; Kato, M
Proc International Conference on Geoteclmical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 V1, P621-626. Publ Japan." Coastal Development Institute of Technology, 1991 A newly developed finite element code, LIQCA, with a cyclic elastoplastic constitutive model to represent a cohesionless seabed, is used in analysis of wave-induced seabed liquefaction. The finite element formulation is presented and its accuracy assessed against analytical solutions. Effects of water depth, seabed slope, and permeability on the induced porewater pressures, shear stresses, and ground movements are investigated.
934187 Wave-induced transient porewater pressure and seabed instability in surf zone Sakai, T; Hattori, A; Hatanaka, K
Proc International Conference on Geotechnical Engineering for Coastal Development, GEO-COAST'91, Yokahama, 3-6 September 1991 VI, P627-632. Publ Japan." Coastal Development Institute of Technology, 1991 The applicability of the boundary layer approximation solution of Mei and Foda (1981) to describe seabed pore pressure in the surf zone is first demonstrated. The solution is then modified to take into account the wave-induced bottom shear and applied to estimate the right hand side of the momentum equation for the solid skeleton under breaking waves. The instability proposed by Madsen (1974) is discussed with reference to these results. It is suggested that instability is more likely just after passage of the wave crest than just before, as the horizontal gradient of pore pressure is large and the vertical effective stress small in the former case.
The application of rock mass classification in engineering design is examined. Three commonly used methods (RSR, RMR, Q) are outlined and their parameters and classification structures reviewed. Consideration of discontinuity frequency and size effects in rock engineering are included. A new classification concept is proposed, using a weighted engineering matrix and a universal rock mass evaluation, according to Hudson's interaction matrix approach. These ideas are illustrated for the case of underground engineering design. 934190 Engineering geological characterization of weak rocks: classification, sampling and testing Clerici, A
Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P179-184. Publ London: Thomas Tel]brd, 1992 A classification system for weak rocks developed during mapping of large areas of Italy is presented. Because of the many types of weak rock and numerous causes of weakness, initial subdivision based on lithologic characteristics is proposed: soft rocks; stratified rocks with low strength layers; fractured rocks; chaotic rocks; weathered rocks; and swelling rocks. The many techniques for sampling and laboratory testing of rocks are tabulated, and those suitable for weak rocks indicated. The importance of including field tests in characterising heterogeneous weak rock masses is emphasised. 934191 Development of a roof and floor classification applicable to collieries Buddery, P; Oldroyd, D C
Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P197-202. Publ London: Thomas Tel/brd, 1992 Coal measures strata are frequently laminated, generally weak, and variable in character: coal mining typically involves rapid excavation and large areas of unsupported roof. Because of these features, rock classification systems specific to coal mines are desirable. Such systems should be based on measurements made on large numbers of samples using methods which reflect likely modes of strata control problem. The systems
© 1993 Pergamon Press Ltd. Reproduction not permitted