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Stress conditions around the Niagara Gorge
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1008 JUREWICZ, BR GRE~WALD, LE BROWN,CO Focused laser beams to assist rock excavation. Report. 80F,~T,33R. UNIT .AIRC .RES .LAB.E .HARTFORD, CONN .USA R~.N-9715~3-11. F~D .RAIL.Ar~.DEPT.TRANSP WASHINGTON, DC,NOV. 7~, 73P. A focused carbon dioxide laser beam has been investigated as a means of cuttin~ the gauge of a herd-rock tunnel being excavated by a continuous tunnel-boring maohine. Tests were conducted on granite, diabase and quartzite. Laser powers and kerfing speeds were predicted. A thermo-mechanical stress analysis of the laser. kerf and mechanical-cutter load was performed. Stresses from the combined load were determined using finite element analysis. Fracture conditions were also assessed.
Surface structures lOO9
MCL~TNAN, JD UNIV .TORONTO,ONT. CDN ROEGI~S, J UNIV .TORONTO,ONT. CDN Stress conditions around the Niagara Gorge. THIRD SYMPOSIUM ON E~GNG APPLICATIONS OF SOLID MECHANICS, TORONTO,JUNE 1976. ~ I E S . Field measurements of deformations and stresses in the vicinity of the Niagara Gorge allude to the existence of significant horizontal stress components. A compilation of available stress determlnaticas and convergence mea• surem~ts was made. Two-dimensional finite element anal~ses of representative horizontal and vertical secticas of the Niagara Gorge were carried out using the mechanical properties of t h e rock formations as determined from extensive laboratory tests. Auth.
Dams and embankments i010 STE/~TSON, PC DEPT.OF MINES, TASMANIA,AUS MOORE,WR DEPT.OF M ~ A ~ , TASMANIA,AUS A logical loop for the geological investigation of dam sites. 2F,IIR. Q.J. ~ q ~ G .GEOL. ,Vg,N2,1976,P65-71. The investi@ation for the dam sites on Whltewater Creek, Tasmenla illustrates two principles for site investi@ation in areas w h e r e geological exposures vary from @ood to poor: (i) The need for an integrated approach to the investigation using all the geological, geophysical and sampling techniques that are available, stud (2) that even when all t h e s e t o o l s e r e aR~lied to~ether ~ a certain level of geological knowledge ms~ he attained by the investi6~tic~ and the process has to be repeated by a series of logical loops to obtain a higher level of geological k~owled~e. ~his process is illustrated by the comparlaca of two geological maps of the Whitewater Creek area. Auth. 1011 ANDRIC,M ROBBRTS,GT TARVYDAS, RK Eaglueering geolosy of the Gordon Dam, South West Tasmania. IlF,TT, XIR.
Q .J .ETIGNG.OEOL. ,vg, NI,1976,PI-2~. T h e G o r d o n Dam is a double c u r v a t u r e
concrete arch structure I~0 m high, formImg part of a hydro-electric scheme. The dam is sited on folded and faulted Precambrian quartzite. Driving a~Its was favoured ove~ dis. mond ch-~lltn£ i n siting the dam end for de~11ed ~I%~esti~ations to prove the stabilSty of the foundations. Considerable excavation on the left abutment was necessary
to remove unfavourable rock and a continuous pre-split face of 122 m ",,ms produced. The geological condltic~s found during excavation were better then anticipated thus raising the computed factor of safety. Auth.
Foundations See also abstract: 1054. 1012 ARvIDSSON, K Elastically founded shearwslls with two rows of openings. 4F,6R. J .AM.CONCR .INST. ,V73,N3,MAR .1976,P151-154. A practicalhand method for the analysis of interacting coupled shearwalls with two rows of openln6s is presented. By basing the analysis on the continous comnection technique, the high degree of static indete~m~-acy of the system has been reduced to a fourth order differential equation. Elastic foundation conditions are taken into account for the system. Results, directly applicable for practical use, ere given for a uniformly distributed load. Two examples have been analyzed to illustrate the method and show the effects of the foundations. Auth. 1013 SINONS,NE MENZIES,BK A short course in foundation engineering. ]PC SCI.TECH.PRESS, ISBN 0 902852 b,2 6,APR.1975,156P. This book is based on lectures givem on courses held at the University of Surrey. It contains data concentrated in tables, charts and design curves. This book will be of value to civil engineerlng consultants and contracting engineers as well as to civil engineering students and research workers. The following are considered: effective stress; shear strength immediate settlements; bearing capacity of footings; settlement analysis; piled foundaticms. Auth. MENZlES,BK SIMSNS,NE Degree problems in soil mechanics and foundation engi-
n~-..r iD~. SCI.TECH.PRESS, ISBN O 932852 ~,3b,,ABR.1975,102P. This book contains over one hundred degree problems in soil mechanics and foundation engineering. To aid the working of the problems a com~rehemsive selection is given of design charts and tables. The book should he of use to practising foundation e ~ s as well as to degree studemts. The following are considered: notation; physical properties; effective strength; shear strength; soil stresses, beering capacity end ccasolidation; seepage; eerth ~ressure; stsbility of slopes and earth dams; foundatioms. Auth.
Slopes 1015 CATALAN, JM CORNELL,CA Earth slope reliability by a level-crossing method. 3F, IT,I~R. J.G~T~CH.E~GNG DIV ASCE,VIO2,GT6,JUNE,1976,P591-60~. An approximate for~ml-tlon for the reliability analysis of earth slopes was derived by ~ f C T E ~ g the slope rellability e n a ~ I s l~oblem into a level-crossing prod blem, solved aPlroximatel~ by finding the expected number of mluima of the safety margin (l~ocess) that lie below zero. The ~=I, feature of the solution is that, in effect, it ccemlders the slope as a series system with an infinite number of (correlated) failure modes. The results obtained ~ that the use of the failure mode of least reliability to apprc~mate the probubility
1008 JUREWICZ, BR GRE~WALD, LE BROWN,CO Focused laser beams to assist rock excavation. Report. 80F,~T,33R. UNIT .AIRC .RES .LAB.E .HARTFORD, CONN .USA R~.N-9715~3-11. F~D .RAIL.Ar~.DEPT.TRANSP WASHINGTON, DC,NOV. 7~, 73P. A focused carbon dioxide laser beam has been investigated as a means of cuttin~ the gauge of a herd-rock tunnel being excavated by a continuous tunnel-boring maohine. Tests were conducted on granite, diabase and quartzite. Laser powers and kerfing speeds were predicted. A thermo-mechanical stress analysis of the laser. kerf and mechanical-cutter load was performed. Stresses from the combined load were determined using finite element analysis. Fracture conditions were also assessed.
Surface structures lOO9
MCL~TNAN, JD UNIV .TORONTO,ONT. CDN ROEGI~S, J UNIV .TORONTO,ONT. CDN Stress conditions around the Niagara Gorge. THIRD SYMPOSIUM ON E~GNG APPLICATIONS OF SOLID MECHANICS, TORONTO,JUNE 1976. ~ I E S . Field measurements of deformations and stresses in the vicinity of the Niagara Gorge allude to the existence of significant horizontal stress components. A compilation of available stress determlnaticas and convergence mea• surem~ts was made. Two-dimensional finite element anal~ses of representative horizontal and vertical secticas of the Niagara Gorge were carried out using the mechanical properties of t h e rock formations as determined from extensive laboratory tests. Auth.
Dams and embankments i010 STE/~TSON, PC DEPT.OF MINES, TASMANIA,AUS MOORE,WR DEPT.OF M ~ A ~ , TASMANIA,AUS A logical loop for the geological investigation of dam sites. 2F,IIR. Q.J. ~ q ~ G .GEOL. ,Vg,N2,1976,P65-71. The investi@ation for the dam sites on Whltewater Creek, Tasmenla illustrates two principles for site investi@ation in areas w h e r e geological exposures vary from @ood to poor: (i) The need for an integrated approach to the investigation using all the geological, geophysical and sampling techniques that are available, stud (2) that even when all t h e s e t o o l s e r e aR~lied to~ether ~ a certain level of geological knowledge ms~ he attained by the investi6~tic~ and the process has to be repeated by a series of logical loops to obtain a higher level of geological k~owled~e. ~his process is illustrated by the comparlaca of two geological maps of the Whitewater Creek area. Auth. 1011 ANDRIC,M ROBBRTS,GT TARVYDAS, RK Eaglueering geolosy of the Gordon Dam, South West Tasmania. IlF,TT, XIR.
Q .J .ETIGNG.OEOL. ,vg, NI,1976,PI-2~. T h e G o r d o n Dam is a double c u r v a t u r e
concrete arch structure I~0 m high, formImg part of a hydro-electric scheme. The dam is sited on folded and faulted Precambrian quartzite. Driving a~Its was favoured ove~ dis. mond ch-~lltn£ i n siting the dam end for de~11ed ~I%~esti~ations to prove the stabilSty of the foundations. Considerable excavation on the left abutment was necessary
to remove unfavourable rock and a continuous pre-split face of 122 m ",,ms produced. The geological condltic~s found during excavation were better then anticipated thus raising the computed factor of safety. Auth.
Foundations See also abstract: 1054. 1012 ARvIDSSON, K Elastically founded shearwslls with two rows of openings. 4F,6R. J .AM.CONCR .INST. ,V73,N3,MAR .1976,P151-154. A practicalhand method for the analysis of interacting coupled shearwalls with two rows of openln6s is presented. By basing the analysis on the continous comnection technique, the high degree of static indete~m~-acy of the system has been reduced to a fourth order differential equation. Elastic foundation conditions are taken into account for the system. Results, directly applicable for practical use, ere given for a uniformly distributed load. Two examples have been analyzed to illustrate the method and show the effects of the foundations. Auth. 1013 SINONS,NE MENZIES,BK A short course in foundation engineering. ]PC SCI.TECH.PRESS, ISBN 0 902852 b,2 6,APR.1975,156P. This book is based on lectures givem on courses held at the University of Surrey. It contains data concentrated in tables, charts and design curves. This book will be of value to civil engineerlng consultants and contracting engineers as well as to civil engineering students and research workers. The following are considered: effective stress; shear strength immediate settlements; bearing capacity of footings; settlement analysis; piled foundaticms. Auth. MENZlES,BK SIMSNS,NE Degree problems in soil mechanics and foundation engi-
n~-..r iD~. SCI.TECH.PRESS, ISBN O 932852 ~,3b,,ABR.1975,102P. This book contains over one hundred degree problems in soil mechanics and foundation engineering. To aid the working of the problems a com~rehemsive selection is given of design charts and tables. The book should he of use to practising foundation e ~ s as well as to degree studemts. The following are considered: notation; physical properties; effective strength; shear strength; soil stresses, beering capacity end ccasolidation; seepage; eerth ~ressure; stsbility of slopes and earth dams; foundatioms. Auth.
Slopes 1015 CATALAN, JM CORNELL,CA Earth slope reliability by a level-crossing method. 3F, IT,I~R. J.G~T~CH.E~GNG DIV ASCE,VIO2,GT6,JUNE,1976,P591-60~. An approximate for~ml-tlon for the reliability analysis of earth slopes was derived by ~ f C T E ~ g the slope rellability e n a ~ I s l~oblem into a level-crossing prod blem, solved aPlroximatel~ by finding the expected number of mluima of the safety margin (l~ocess) that lie below zero. The ~=I, feature of the solution is that, in effect, it ccemlders the slope as a series system with an infinite number of (correlated) failure modes. The results obtained ~ that the use of the failure mode of least reliability to apprc~mate the probubility