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Integrity testing
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8251S8 INgEGRr2Y TESTING Stain, R T Civ Engmg, London, April 1982, P53-59 Describes several tests to be used in the integrity testing of conzrete piles. These divide into 2 groups: simple integrity tests which check the integrity of the shaft, ar~ dynamic response methods which relate soil conditions and pile perfc~ramce under load. See item 825139, for examples illustrating the use of these tests.
of pile interaction on stiffness and damping of pile groups, distribution of internal f ~ c e s in the piles and response of pile supported foundations %o harmonic excitation. The theory indicates that dyv~m~c group effects can considerably differ fr~n static group effects Imrtic~larly in that the group stiffress and damping can be not only reduced by pile-soil-pile interaction but also increased depending on frequency, pile spacing and the weakening of the soil aroumd the iles. The effect of frequency is much stronger for pile groups than for single piles. Auth.
825139 INI'EGRITY TESTING Stain, R T Civ Emgr~, London, May 1982, P71-73 Several case studies are presented to demonstrate the use of integrity testing in detection of substandard piles, in provlr~ structural sounlness anl in the prediction of working settlements of pile groups. Methods of integrity testing are discussed in a companion paper (see item 8251B8)~
8251~0 C(~JTING Civil Engng, London, Jan 1982, P31-43 Includes a discussion of computer programs for foundation ar~lysi s. 825141 ELAST0-PTASTIC ANALYSES OF DEEP FOUNDATIONS IN COHESIVE SOIL Griffiths, D V Int J Nt~n Arml Meth Geomech, V6, N2, AprilJune 1982, P211-218 The bearing capacity of deep foundations has been analysed using finite elements in conjunction with elasto-viscoplasticity. The influence of elastic parameters, mesh size amd strain corziltions on computed collapse loads was observed. Axisymmetric problems in particular were of interest, because it was founl that good numerical solutions could be obtained through to collapse provided reduced integration was used. Auth. 8251~2 PULVERTZED COAL ASH AS STRUCTURAL FILL Leonards, G A; Bailey, B J Geotech Engng Div ASCE, VI08, NGT4, April 1982, P517-531 Presents a case history in the use of compacted, untreated coal ash as a structural fill to support the foundations of a new precipitatar fc~ a power plant. Laboratory tests were performed to determine the physical properties of the ash ms terials used in the fill: gradation, chemical analysis, particle shape and composition, cemPaction, shear strength and consolidation tests. Field density and plate load tests were also conducted during fill construction. Cone penetrometer tests were used to evaluate the consistency of the compacted fill and total settlements of ~he foundations were measured. Plate load tests proved to be a reliable imdicat~ of observed settlements. 825143 ~ T I C A L VIBRATION OF PILE GROUPS Sheta, M; Novak, M J Geotech Engng Div ASCE, VI08, NGT~, April
1982, P570-590 An approximate theory for vertical vibration of pile groups is presented. The theory accounts for
825144 SINGLE PILE RESPONSE TO CYCLIC LATERAL LOAD Pottlos, H G J Geotech Engng Div ASCE, VI08, NGT3, March i~2, P355-375 An analysis is presented for the deflection of a pile in clay subjected to quasi-static cyclic lateral loading. This analysis is an extension of the elastic continuum am~1~sis for static pile response, and allows for the reduction of soil modulus and yield pressure with increasing cyclic strain c~ deflection. A number of theoretical solutions are presented to illustrate the factors influencing the increase in deflection and bending moment in the pile with increasing cycles and cyclic load level. Comparisons are then made between the theoretical behaviour and that measured in field tests. 825145 SHALLOW FOUNDATIONS FOR TALL S T R ~ S IN FLORIDA Leafy, D J; Langan, B F J Geotech Engng Div ASCE, V108, NGT3, March 1982, P377-393 Three case histories in FloridaI USA, are presented to demonstrate the use of shallow foundations in tall buildings. Subsurface exploration programmes Inclmded conventional borings, static cone penetrcmeter tests, and large diameter cering of soft limerock rock. It is shown that Coml~essibillty of the subsurface material can be confidently predicted, and that such buildings can be constructed on shallow founlations with acceptable settlement behaviour. Precompression of un~_erlying soils by preloading to reduce settlement was used in all cases. 8251~6 DYNAMIC FORMULA FOR PRESSURE I N J E ~ FOOTINGS Nardltmd, R L J Geotech Ergng Div ASCE, VI08, NGT3, March 1982, F~19-437 The mathematical derivation of a dynamic piledrivlr~ formula far the installation of Pressi~e Injected Footings (Frankl Piles) is presented. The necessity of differentiating between the two fundamental methods used to make the shaft of a Pressure Injected Footing is proposed and load-test data then presented which support the proposition. An example of how to use the formula is given. The fc~mula contains a constant which is a function of the type of soil and type of shaft. If the result of a load-test is availgble, the constant can be evaluated from the test data. For those cases where no load-test result is available, a table is presented giving suggested values of the constant fc~ various types of soil and shaft. 825147 HORIZONPAL STIFFNESS AND DAMPING OF SI~3LE PILES Dobry, R; Vicen%e, E; O'Rourke~ M J J Geotech Engrg Div ASCE, VI08, NGT3, March 1982, P439-459
8251S8 INgEGRr2Y TESTING Stain, R T Civ Engmg, London, April 1982, P53-59 Describes several tests to be used in the integrity testing of conzrete piles. These divide into 2 groups: simple integrity tests which check the integrity of the shaft, ar~ dynamic response methods which relate soil conditions and pile perfc~ramce under load. See item 825139, for examples illustrating the use of these tests.
of pile interaction on stiffness and damping of pile groups, distribution of internal f ~ c e s in the piles and response of pile supported foundations %o harmonic excitation. The theory indicates that dyv~m~c group effects can considerably differ fr~n static group effects Imrtic~larly in that the group stiffress and damping can be not only reduced by pile-soil-pile interaction but also increased depending on frequency, pile spacing and the weakening of the soil aroumd the iles. The effect of frequency is much stronger for pile groups than for single piles. Auth.
825139 INI'EGRITY TESTING Stain, R T Civ Emgr~, London, May 1982, P71-73 Several case studies are presented to demonstrate the use of integrity testing in detection of substandard piles, in provlr~ structural sounlness anl in the prediction of working settlements of pile groups. Methods of integrity testing are discussed in a companion paper (see item 8251B8)~
8251~0 C(~JTING Civil Engng, London, Jan 1982, P31-43 Includes a discussion of computer programs for foundation ar~lysi s. 825141 ELAST0-PTASTIC ANALYSES OF DEEP FOUNDATIONS IN COHESIVE SOIL Griffiths, D V Int J Nt~n Arml Meth Geomech, V6, N2, AprilJune 1982, P211-218 The bearing capacity of deep foundations has been analysed using finite elements in conjunction with elasto-viscoplasticity. The influence of elastic parameters, mesh size amd strain corziltions on computed collapse loads was observed. Axisymmetric problems in particular were of interest, because it was founl that good numerical solutions could be obtained through to collapse provided reduced integration was used. Auth. 8251~2 PULVERTZED COAL ASH AS STRUCTURAL FILL Leonards, G A; Bailey, B J Geotech Engng Div ASCE, VI08, NGT4, April 1982, P517-531 Presents a case history in the use of compacted, untreated coal ash as a structural fill to support the foundations of a new precipitatar fc~ a power plant. Laboratory tests were performed to determine the physical properties of the ash ms terials used in the fill: gradation, chemical analysis, particle shape and composition, cemPaction, shear strength and consolidation tests. Field density and plate load tests were also conducted during fill construction. Cone penetrometer tests were used to evaluate the consistency of the compacted fill and total settlements of ~he foundations were measured. Plate load tests proved to be a reliable imdicat~ of observed settlements. 825143 ~ T I C A L VIBRATION OF PILE GROUPS Sheta, M; Novak, M J Geotech Engng Div ASCE, VI08, NGT~, April
1982, P570-590 An approximate theory for vertical vibration of pile groups is presented. The theory accounts for
825144 SINGLE PILE RESPONSE TO CYCLIC LATERAL LOAD Pottlos, H G J Geotech Engng Div ASCE, VI08, NGT3, March i~2, P355-375 An analysis is presented for the deflection of a pile in clay subjected to quasi-static cyclic lateral loading. This analysis is an extension of the elastic continuum am~1~sis for static pile response, and allows for the reduction of soil modulus and yield pressure with increasing cyclic strain c~ deflection. A number of theoretical solutions are presented to illustrate the factors influencing the increase in deflection and bending moment in the pile with increasing cycles and cyclic load level. Comparisons are then made between the theoretical behaviour and that measured in field tests. 825145 SHALLOW FOUNDATIONS FOR TALL S T R ~ S IN FLORIDA Leafy, D J; Langan, B F J Geotech Engng Div ASCE, V108, NGT3, March 1982, P377-393 Three case histories in FloridaI USA, are presented to demonstrate the use of shallow foundations in tall buildings. Subsurface exploration programmes Inclmded conventional borings, static cone penetrcmeter tests, and large diameter cering of soft limerock rock. It is shown that Coml~essibillty of the subsurface material can be confidently predicted, and that such buildings can be constructed on shallow founlations with acceptable settlement behaviour. Precompression of un~_erlying soils by preloading to reduce settlement was used in all cases. 8251~6 DYNAMIC FORMULA FOR PRESSURE I N J E ~ FOOTINGS Nardltmd, R L J Geotech Ergng Div ASCE, VI08, NGT3, March 1982, F~19-437 The mathematical derivation of a dynamic piledrivlr~ formula far the installation of Pressi~e Injected Footings (Frankl Piles) is presented. The necessity of differentiating between the two fundamental methods used to make the shaft of a Pressure Injected Footing is proposed and load-test data then presented which support the proposition. An example of how to use the formula is given. The fc~mula contains a constant which is a function of the type of soil and type of shaft. If the result of a load-test is availgble, the constant can be evaluated from the test data. For those cases where no load-test result is available, a table is presented giving suggested values of the constant fc~ various types of soil and shaft. 825147 HORIZONPAL STIFFNESS AND DAMPING OF SI~3LE PILES Dobry, R; Vicen%e, E; O'Rourke~ M J J Geotech Engrg Div ASCE, VI08, NGT3, March 1982, P439-459