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Measurement of insitu shear strength
67A
whereas the plastic limits increased; the liquid limits increased slightly, the maxim~n dry density decreased ar~ the optimum moisture content increased. From t h e results of Durability and CBR ~sts, only the A-I soil and A-2 soll have amy potential as cclnpetent base materials azd consequently only these require amy further field tests. 6 per cent l~me is reco,mended for these field tests. The other soils that do not q,ml ~fy for bases may be utilized as subbase materials. Auth.
783202 SHCRT RAI~GE DISTANCE ~ N T BY ELECTROMAGNETIC PHASE CCMPARISON TECHNIQUE Greene, J R Geophys Prospect, V25, N2j Jure 1977, P269~9 Reviews the use of electromagnetic techniques to the measurement of distances under 2kin with millimetric accuracy, concentrating on a new class of near infrared electro-optic i n s ~ n t s . The techniques are applicable to the determination of subsidence cr creep in existing structures, or for earth movement or strain studies.
Soil compaction 783198 VIBROFLOTATION
COMPACTION OF COHESIONLESS SOILS Brown, R E J Geotech Engr~ Div ASCEj VI03, NGTI2, 1977, P1437-1451
The factors affecting the density achieved in compacting cohesionless soils by vibroflotation are analysed. A test program was used to investigate the influence of soil type, backfill gradation, probe withdrawal rate and probe spacing on density achieved. A rating system for backfill materials and recommended inspection and quality control procedures are presented.
783203 ROLE OF THEORY IN G E O ~ H N I C A L FIELD OBSERVATIONS Peck, R B; Deere, D U In: Structural and Go, technical Mechanics (EmglewOod Cliffs, NJ: Prer~ice-Hall, 1977)j
P2o5-219 Discusses t h e role of theory fram t h e time of Terzaghi and with reference to both early and more recent case studies. 7832O4 FIELD ~ A S U R D ~ N T OF PERMEABILITY IN SOIL AND ROCK Milliganj V Proc Conference on In-situ Measurement of Soil Prope_vties~ Raleighj NC, 1-4 June 1975, V2, I:'3-36, disc P37-54 A state-of-the-art report with a rAtmber of case studies. 37 refs.
Site Investigation and Field Observation See also: 783124 783199 MEASURING HORIZONTAL MOVEMENT OF THE GROUND Hudson, J A; Ryley, M D Turn Tunnlg, Vl0, N2, 1978, P55-58 The use of inclometers in bore-holes to measure horizontal mowments of the ground around tunnels is considered; Sources of error are discussed, the results of a calibration study of an instrument are ;resented, and recommerdations are made for the use c~ incl~_~+,~_ters in the field. 783200 D O C E N T S OF THE INTERNATIONAL SOCIEI"/ FOR ROCK MECHANICS. SUGGESTED METHCDS FOR MONITORING ROCK MOVemeNTS USING INCLINOMETERS AND TILTMETERS Rock Mech, VlO, NI-2, Dec 1977, PSl-106
7832O1 CROSS-HOLE
AND DOWN-HOLE VS BY MECHANICAL IMPULSE Auld, B J Geotech Engng Div ASCE, V103, NGTI2, 1977,
P1381-1398 Two techniques for determining in-situ shear and compressional wave velocities are shown to provide valtmhle information on the elastic properties of soils ard rocks. Both techniques utilize the reversal of first motion of shear waves to determine the shear wave arrival times. An instr%mmmtation system for determining seismic wave velocities down deep bcreholes, and a case history for a 370m deep bore-hole, are described.
783205 M E A N T OF INSITU SHEAR STREEK~fH Sehmertmarm, J H Proc Conference on In-situ Measurement of Soll Properties, Raleigh, NC, I-4 June 1975, V2, 157-138, disc P139-179 A W0ate-of-the-art report concentrating on recent developments anl research results for the main types of in situ strength tests. 108 r e f s. 783206 IN SITU MEASUREMEN9 OF INITIAL STRESSES AND DEFORMATION CHARACTERISTICS Wroth, C P Proc Conference on In-situ Measurement of Soil Properties, Raleigh, NC, 1-4 June 1975, V2, P181-230, disc P231-277 A state-of-the-art repcrt conside_~ingj firstly, the uncertainty of any lab meas%~ ~ment of the coefficient of earth pressure at rest, and %he difficulty of making accurate measurements '.n the field, and secondly, in situ deformation measurement and developments in the analysis and conduct of pressurea~ter tests. The degree of ~is~bance+- of the grourd is shown to be crucial fer any in situ measurements, and the need for the further developments of selfdrilling instruments is eml~hasised. 67 refs. 783207 IN SITU M E A S U R ~ N ~ OF VOLUME CHANGE CHARACTERISTICS Mitchell, J K; Gardner, W S Proc Conference on In-situ Measurement of SOil Properties, Raleigh, NO, 1-4 June 1975, V2, P279-345, disc P346-356 A state-of-the-art report discussing the insitu determination of properties necessary for the prediction of the rate and amount of volume aham@~s of soils and soft rocks in response tO stress chamges, but not the prediction of settlement, heave cr other permanent deformations. 103 refs.
whereas the plastic limits increased; the liquid limits increased slightly, the maxim~n dry density decreased ar~ the optimum moisture content increased. From t h e results of Durability and CBR ~sts, only the A-I soil and A-2 soll have amy potential as cclnpetent base materials azd consequently only these require amy further field tests. 6 per cent l~me is reco,mended for these field tests. The other soils that do not q,ml ~fy for bases may be utilized as subbase materials. Auth.
783202 SHCRT RAI~GE DISTANCE ~ N T BY ELECTROMAGNETIC PHASE CCMPARISON TECHNIQUE Greene, J R Geophys Prospect, V25, N2j Jure 1977, P269~9 Reviews the use of electromagnetic techniques to the measurement of distances under 2kin with millimetric accuracy, concentrating on a new class of near infrared electro-optic i n s ~ n t s . The techniques are applicable to the determination of subsidence cr creep in existing structures, or for earth movement or strain studies.
Soil compaction 783198 VIBROFLOTATION
COMPACTION OF COHESIONLESS SOILS Brown, R E J Geotech Engr~ Div ASCEj VI03, NGTI2, 1977, P1437-1451
The factors affecting the density achieved in compacting cohesionless soils by vibroflotation are analysed. A test program was used to investigate the influence of soil type, backfill gradation, probe withdrawal rate and probe spacing on density achieved. A rating system for backfill materials and recommended inspection and quality control procedures are presented.
783203 ROLE OF THEORY IN G E O ~ H N I C A L FIELD OBSERVATIONS Peck, R B; Deere, D U In: Structural and Go, technical Mechanics (EmglewOod Cliffs, NJ: Prer~ice-Hall, 1977)j
P2o5-219 Discusses t h e role of theory fram t h e time of Terzaghi and with reference to both early and more recent case studies. 7832O4 FIELD ~ A S U R D ~ N T OF PERMEABILITY IN SOIL AND ROCK Milliganj V Proc Conference on In-situ Measurement of Soil Prope_vties~ Raleighj NC, 1-4 June 1975, V2, I:'3-36, disc P37-54 A state-of-the-art report with a rAtmber of case studies. 37 refs.
Site Investigation and Field Observation See also: 783124 783199 MEASURING HORIZONTAL MOVEMENT OF THE GROUND Hudson, J A; Ryley, M D Turn Tunnlg, Vl0, N2, 1978, P55-58 The use of inclometers in bore-holes to measure horizontal mowments of the ground around tunnels is considered; Sources of error are discussed, the results of a calibration study of an instrument are ;resented, and recommerdations are made for the use c~ incl~_~+,~_ters in the field. 783200 D O C E N T S OF THE INTERNATIONAL SOCIEI"/ FOR ROCK MECHANICS. SUGGESTED METHCDS FOR MONITORING ROCK MOVemeNTS USING INCLINOMETERS AND TILTMETERS Rock Mech, VlO, NI-2, Dec 1977, PSl-106
7832O1 CROSS-HOLE
AND DOWN-HOLE VS BY MECHANICAL IMPULSE Auld, B J Geotech Engng Div ASCE, V103, NGTI2, 1977,
P1381-1398 Two techniques for determining in-situ shear and compressional wave velocities are shown to provide valtmhle information on the elastic properties of soils ard rocks. Both techniques utilize the reversal of first motion of shear waves to determine the shear wave arrival times. An instr%mmmtation system for determining seismic wave velocities down deep bcreholes, and a case history for a 370m deep bore-hole, are described.
783205 M E A N T OF INSITU SHEAR STREEK~fH Sehmertmarm, J H Proc Conference on In-situ Measurement of Soll Properties, Raleigh, NC, I-4 June 1975, V2, 157-138, disc P139-179 A W0ate-of-the-art report concentrating on recent developments anl research results for the main types of in situ strength tests. 108 r e f s. 783206 IN SITU MEASUREMEN9 OF INITIAL STRESSES AND DEFORMATION CHARACTERISTICS Wroth, C P Proc Conference on In-situ Measurement of Soil Properties, Raleigh, NC, 1-4 June 1975, V2, P181-230, disc P231-277 A state-of-the-art repcrt conside_~ingj firstly, the uncertainty of any lab meas%~ ~ment of the coefficient of earth pressure at rest, and %he difficulty of making accurate measurements '.n the field, and secondly, in situ deformation measurement and developments in the analysis and conduct of pressurea~ter tests. The degree of ~is~bance+- of the grourd is shown to be crucial fer any in situ measurements, and the need for the further developments of selfdrilling instruments is eml~hasised. 67 refs. 783207 IN SITU M E A S U R ~ N ~ OF VOLUME CHANGE CHARACTERISTICS Mitchell, J K; Gardner, W S Proc Conference on In-situ Measurement of SOil Properties, Raleigh, NO, 1-4 June 1975, V2, P279-345, disc P346-356 A state-of-the-art report discussing the insitu determination of properties necessary for the prediction of the rate and amount of volume aham@~s of soils and soft rocks in response tO stress chamges, but not the prediction of settlement, heave cr other permanent deformations. 103 refs.