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Experience with slides in decomposed schists and phyllites
19A
pretation of test results are discussed. A method is given for minimisln~ the cost of stabilizing rock slopes using prestressed cables, 168 DE FRIES, CK Experience with slides in decomposed schists and phyllites. 5F,14R. PROC.2ND INT.CONGRESS, IAB3,SAO PAUID,PAP~ V-PC-2,V2, 1974,13P. This paper presents a summary of Venezuelan experimuce in the design and re-evaluation of slopes in schist and phyllite-derived residual soils. Case histories of the performance of slopes cut for a pumping station and for hi@hw~s are given briefly. A number of slopes in these difficult materials have been successfully stabilized with anchored retaining wa]1~, 169 PATTON,FD CONSULTANT,VANCOUV~,CDN HmNDRON,AJ UNIV.ILLINOIS,URBANA,USA General Report on mass movements. 29F,53R. PROC.2ND INT.CONGRESS, IAEG, SAO PAULO,PAPER V-GR,V2,197k,
considered. A programme of resources exploration is proposed, which involves a basic rock classification durin~ the first stage and the au4gnentlug of this by supplementary observations at the more promising locations as part of the second stage. The application of the classification (involving fracture spacings and intact strength observations) to problems of materials utilization and ease of extraction, is discussed. Supplementary observations of block shapes, discontinuity development s mineralogy, chemistry and durability are considered, sad methods are suggested for the evaluation of each property. Auth. 174 INFANTI,N PROMON ~NG.SAO PAULO,BR KANJI,MA PROMON k~NG.SAO PAULO,BR Prellm~nary considerations of geochemical factors affecting the safety Of earth dams. 2F,14R. FROC .2ND INT.CONGRESS, IAEG, SAO PAUID,PAP~ IV-33,VI , 197h,llP. Some cases of earth.dams investigated and reported in the literature where iron precipitation was observed in drains, as well as other problems of geochemical or biological nature related to earth dams are described.
57P. This broad ranging General Report covers most aspects of the study of the stability of soil and rock slopes. Major sections are devoted to the geotechnlcal environment ofslopes, methods of landslide recognition, field investigation of slides, determination of shear strength parameters, analysis of slope stability taking account of sliding on discontinuities and dynamic effects, Bud nonitoring slide movements. 170 PASEK, J CZECH.ACAD.SCIENCES,FRAGUE, CS Gravitational block-type movements. 9F,19R. PRoC.2ND INT.CONGRESS, IAEG,SAO PAULO,PAP~ V-PC.I,V2, 1974,9P. i The block-type slope movements considered here are those in which large, rigid blocks of rock slip down the slope on underlying plastic layers. They occur in horizontally or sub-horizontally bedded strata and in strata where the rock layers dip down-slope. The rigid blocks sink into the plastic ls~ers, lean out, shift and glide or topple,
Earth retaining structures 171 AZAROV,NS Analytical method for determination of backfill pressure on retaining walls.iF, iT, SR. SOIL MECH.FOUND.ENGNG,VI2,NI,1975,P61-66.
Base courses and p a v e m e n t s 172 ZHELEZNIKOV,MA KRIVISSKII,AM Design characteristics of soils hound with mineral cements. In Russian.4R. MOSCOW.VSES.DOROZ.NAUUH.ISSLED.INST TRUDY,V66,1973, P125-134.
Geological factors of importance in surface structu res See also abstract: 19k.
z73 FRANKLIn, JA Rock quality in relation to the quarrying and per. f o r ~ c e of rock construction materials. 7F,18R. PROC.2ND INT.CONGRESS, IAEG,SAO PAUL0,PAP~ IV-PC-2,VI, 1974, liP. '~ock-quality" and the selection of quarry sites are
175 LUCO;JE WONG,HL TRIFUNAC,MD A note on the dynamic response of rigid embedded foundations.6F,24R. K~RTHQ.~GNG STRUCT.DYNAM.V4,N2,1975,Pl19-127. The problem of the dynamic response of rigid embedded foundations subjected to the action of external forces and seismic excitation is analyzed. It is shown that to calculate the response of rigid embedded foundations or the response of flat rigid foundations subjected to non-vertically incident seismic waves, it is necessary to obtain not only the impedance matrix for the foundation, but also the forces induced by the incident seismic waves. Under these general conditions, rocking sad torsional motion of the foundation is generated in ~ I t i o n to translation. The case of a t~-dimensional rigid foundation of semi elliptical cross-section is used as an example to ~llnstrate the effects of the e m b e c ~ t depth and angle of incidence Of the seismic waves on the response of the foundation. Auth.
176 B~,JP NORMAN, CD Vibration tests sad analysis of a model arch dam. 12F,3T, aR. EARTHQ. ~ G N G STRUCT.DYNAM.V4,N2,1975;PI63.177. Vibration tests were conducted on a 1/24 scale model ofthe North Fork Dam~ a double-curvature arch dam, to determine natural frequencies, mode shapes and h y d r ~ a m i c p r e s s u r e s . The mode shapes and n a t u r a l f r e q u e n c i e s were determined from tests using two vibrators mounted on the crest of the dam. F~tdrod~amic pressures at the dam-reservolr interface were determined from tests in which the vibrator was attached to the downstream foundation of the dam. The hydrodynamic pressures calculated using Westerfasrd's theory and a theory for arch dams developed by P e r u m a l ~ and Ks/ accurately predicted t h e measured pressure at frequaneles below the first mode frequency of the dam. The differences in the two theories were insignificant. Auth.
pretation of test results are discussed. A method is given for minimisln~ the cost of stabilizing rock slopes using prestressed cables, 168 DE FRIES, CK Experience with slides in decomposed schists and phyllites. 5F,14R. PROC.2ND INT.CONGRESS, IAB3,SAO PAUID,PAP~ V-PC-2,V2, 1974,13P. This paper presents a summary of Venezuelan experimuce in the design and re-evaluation of slopes in schist and phyllite-derived residual soils. Case histories of the performance of slopes cut for a pumping station and for hi@hw~s are given briefly. A number of slopes in these difficult materials have been successfully stabilized with anchored retaining wa]1~, 169 PATTON,FD CONSULTANT,VANCOUV~,CDN HmNDRON,AJ UNIV.ILLINOIS,URBANA,USA General Report on mass movements. 29F,53R. PROC.2ND INT.CONGRESS, IAEG, SAO PAULO,PAPER V-GR,V2,197k,
considered. A programme of resources exploration is proposed, which involves a basic rock classification durin~ the first stage and the au4gnentlug of this by supplementary observations at the more promising locations as part of the second stage. The application of the classification (involving fracture spacings and intact strength observations) to problems of materials utilization and ease of extraction, is discussed. Supplementary observations of block shapes, discontinuity development s mineralogy, chemistry and durability are considered, sad methods are suggested for the evaluation of each property. Auth. 174 INFANTI,N PROMON ~NG.SAO PAULO,BR KANJI,MA PROMON k~NG.SAO PAULO,BR Prellm~nary considerations of geochemical factors affecting the safety Of earth dams. 2F,14R. FROC .2ND INT.CONGRESS, IAEG, SAO PAUID,PAP~ IV-33,VI , 197h,llP. Some cases of earth.dams investigated and reported in the literature where iron precipitation was observed in drains, as well as other problems of geochemical or biological nature related to earth dams are described.
57P. This broad ranging General Report covers most aspects of the study of the stability of soil and rock slopes. Major sections are devoted to the geotechnlcal environment ofslopes, methods of landslide recognition, field investigation of slides, determination of shear strength parameters, analysis of slope stability taking account of sliding on discontinuities and dynamic effects, Bud nonitoring slide movements. 170 PASEK, J CZECH.ACAD.SCIENCES,FRAGUE, CS Gravitational block-type movements. 9F,19R. PRoC.2ND INT.CONGRESS, IAEG,SAO PAULO,PAP~ V-PC.I,V2, 1974,9P. i The block-type slope movements considered here are those in which large, rigid blocks of rock slip down the slope on underlying plastic layers. They occur in horizontally or sub-horizontally bedded strata and in strata where the rock layers dip down-slope. The rigid blocks sink into the plastic ls~ers, lean out, shift and glide or topple,
Earth retaining structures 171 AZAROV,NS Analytical method for determination of backfill pressure on retaining walls.iF, iT, SR. SOIL MECH.FOUND.ENGNG,VI2,NI,1975,P61-66.
Base courses and p a v e m e n t s 172 ZHELEZNIKOV,MA KRIVISSKII,AM Design characteristics of soils hound with mineral cements. In Russian.4R. MOSCOW.VSES.DOROZ.NAUUH.ISSLED.INST TRUDY,V66,1973, P125-134.
Geological factors of importance in surface structu res See also abstract: 19k.
z73 FRANKLIn, JA Rock quality in relation to the quarrying and per. f o r ~ c e of rock construction materials. 7F,18R. PROC.2ND INT.CONGRESS, IAEG,SAO PAUL0,PAP~ IV-PC-2,VI, 1974, liP. '~ock-quality" and the selection of quarry sites are
175 LUCO;JE WONG,HL TRIFUNAC,MD A note on the dynamic response of rigid embedded foundations.6F,24R. K~RTHQ.~GNG STRUCT.DYNAM.V4,N2,1975,Pl19-127. The problem of the dynamic response of rigid embedded foundations subjected to the action of external forces and seismic excitation is analyzed. It is shown that to calculate the response of rigid embedded foundations or the response of flat rigid foundations subjected to non-vertically incident seismic waves, it is necessary to obtain not only the impedance matrix for the foundation, but also the forces induced by the incident seismic waves. Under these general conditions, rocking sad torsional motion of the foundation is generated in ~ I t i o n to translation. The case of a t~-dimensional rigid foundation of semi elliptical cross-section is used as an example to ~llnstrate the effects of the e m b e c ~ t depth and angle of incidence Of the seismic waves on the response of the foundation. Auth.
176 B~,JP NORMAN, CD Vibration tests sad analysis of a model arch dam. 12F,3T, aR. EARTHQ. ~ G N G STRUCT.DYNAM.V4,N2,1975;PI63.177. Vibration tests were conducted on a 1/24 scale model ofthe North Fork Dam~ a double-curvature arch dam, to determine natural frequencies, mode shapes and h y d r ~ a m i c p r e s s u r e s . The mode shapes and n a t u r a l f r e q u e n c i e s were determined from tests using two vibrators mounted on the crest of the dam. F~tdrod~amic pressures at the dam-reservolr interface were determined from tests in which the vibrator was attached to the downstream foundation of the dam. The hydrodynamic pressures calculated using Westerfasrd's theory and a theory for arch dams developed by P e r u m a l ~ and Ks/ accurately predicted t h e measured pressure at frequaneles below the first mode frequency of the dam. The differences in the two theories were insignificant. Auth.