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Method for estimating foundation ultimate capacity. Technical note
158A
The ultimate bearing capacity of footings resting on subsoils consisting of a weak sar~ laye~ overlying a strong deposit has been investigated. Based on model tests of strip and circular footings in a loose or compact sand layer overlying a dense sand deposit, the classical equation of bearing capacity of footings on homogeneous sand was extended to cover cases of these footings in layered sarzls where the upper layer is the weaker. The thecm'y compared well with the available model test results. Design charts are presented. Auth.
835226
STABILISATION OF KARSTIC AREAS BY INJECTION. ABOUT THE GIPSIFEROUS L[h~..'±'IUMIN THE REGION OF PARIS (IN ZRm~'~) Poupellcm, B; Tottlemont, M Bull Int Assoc Engmg Geol, N2~, Dec 1981, Plll-123 Stabilization of buildings in gypsiferous areas in view of the karstic risk may require deep, semi-superficial or superficial four~ations. Additional measures inclt~le injection by means of blocking the solution cavities c~ consolidating the area by mortar, as fc~ the Lutetium gypsif~ous karst, near Paris, France. The degree of karstification may be characterized by a void index which re~esents the average of all a n ~ ! i e s shown by drill recordings. This void index is necessary to d e t e r m i n e the parameters concerning irAJection.
835227 CON~uu'A'AON UPON DOLCMITES OF THE S0%'I~WEbu'a,N TRANSVAAL Partridge, T C; Harris, G M; Diesel, V A Bull Imt Assoc E r ~ g Oeol, N2~, Dec 1981, P12~-135 The south-western part of the Transvaal Province, South Africa is ur~erlain by soluble dolomitic rocks and the development a ~ operation of the gold mines in this area has affected the perfc~mance of surface struct~es through groumdwater lowering in soil covered areas umderlain by cavernous dolomite. The paper describes some local developments imvolv~ng mine surface plant, utilizing the arching characteristics of compacted fills and caissom~ to ~ o v i d e economic four~latiom treatment above areas where the dolomite bedrock possesses a plr~macled configtlration, ar~ the various foundation t r e a t - - s fc~ a housing scheme covering a large area with highly variable soll cor~dtions.
835228 BEAEIS~
CAPACITY OF A STRIP FOUNDATION ON A
OOHESrVE AND ~ON H O M ~ E m ~ m S Bottero, A Rev Fr GeOtech, NI,
SOIL (IN F~E~ZH)
May 1982, P5-20
Presents an analysis, for the plane strain case, of the bearing capacity of a shallow foundation resting on a three-layered cohesive soil. Charts are Iresented of the bearing capacity ratio f ~ different relative thicknesses versus the geometrical and mechanical parameters of heterogeneity. 83522 9 CORROSION OF STEEL FILES DRIVEN IN SOYL DEPOSITS Ohsaki, Y Soils Found, V22, NS, Sept 1982, I~7-76 About 130 steel piles of L-shaped cross-section were driven into natural soll deposits at I0 locations with widely varying soil conditions. Prior to driving, the thicknesses of the piles were cease:red, and the soil conditions investi-
gated. The piles were withdrawn 2, 5 and i0 years after driving. It was concluded that : (i) average corrosion rates were aPlraximately 0 . 0 1 ~ y r for both faces of the piles, (2) no soil parameter was found that decisively influenced corrosion rate, and (3) the steel composition or treatment of the piles was not found to influence the corrosion effects.
835230 MODEL TESTS IN RELATION TO A METHOD TO REDUCE NEGATIVE SKIN FRICTION BY TAPERING A PILE. TECHNICAL NOTE Sawaguchi, M Soils Fotmd, V22, NB, Sept 1982, P130-133 Model tests were carried out using 4 piles with differing kinds of taper in sand to examine the method of using tapered piles to reduce negative skin friction. It is concluded that the method is effective, with the negative akin friction decreasing as the degree of taper increases. 835231 MC~EL TEST AND ANALYSIS OF NEGATIVE FRICTION ACTING ON PILES ~hibata, T; Sekiguchi, H; Yukitomo, H Soils Foumd, V22, N2, June 1982, P29-39 Model tests were performed to investigate the characteristics of negative friction on both vertical amd batter pile groups, and to assess the efficiency of bitumen in reducing these frictions. A method of estimating the group action of negative friction is derived and found to compare well with the model tests on vertical piles. Results fc~ the batter piles are found to agree with the Broms and Fredriksson model of batter pile flexural behaviour when subjected to s~rcmmding ground settlement. Results also indicate that bitumen coatings can reduce the negative friction to acceptable levels.
835232 EARTH PRESSURE ON PILES IN A RGW DUE TO LATERAL SOIL M ~ N T S Matsttl, T; Hong, W P; Ito, T Soils Fot~zl, V22, N2, June 1982, P71-81 A series of model tests on piles in a row was carried out on both clay and sand samples, in c~der to check the validity of a theoretical equation l~eVlously derived by the authors to estimate the lateral l~essure on piles due to soil movements. 835233 UPLIFT OF RIGID VERTICAL PILES IN FROZEN SAND Pocrooshasb, H B; Parameswaran, V R Soils Found, V22, ~2, June 1962, P62-88 Using a simple displacement field the vertical uplift behaviour of a single rigid pile embedded in a frozen sandy soil is analysed. Results of the aralysis are re~resented by curves from which the magnitude of the butt movement can be estimated fc~ given uplift forces. The proced~e outlined is directly applicable to piles embedded in moderately to heavily overconsolidated clay deposits. 835234 METHOD FOR ESTIMATING FOUNDATION ULTIMATE CAPACITY. TECHNICAL NOTE Akim~suru, J 0 Soils Found, V22, N2, June 1982, P89-91 A graphical method of estimating the ultimate failure load of a foundation is l~esented. The method allows c~nparison of different loading test results to derive safety factors.
The ultimate bearing capacity of footings resting on subsoils consisting of a weak sar~ laye~ overlying a strong deposit has been investigated. Based on model tests of strip and circular footings in a loose or compact sand layer overlying a dense sand deposit, the classical equation of bearing capacity of footings on homogeneous sand was extended to cover cases of these footings in layered sarzls where the upper layer is the weaker. The thecm'y compared well with the available model test results. Design charts are presented. Auth.
835226
STABILISATION OF KARSTIC AREAS BY INJECTION. ABOUT THE GIPSIFEROUS L[h~..'±'IUMIN THE REGION OF PARIS (IN ZRm~'~) Poupellcm, B; Tottlemont, M Bull Int Assoc Engmg Geol, N2~, Dec 1981, Plll-123 Stabilization of buildings in gypsiferous areas in view of the karstic risk may require deep, semi-superficial or superficial four~ations. Additional measures inclt~le injection by means of blocking the solution cavities c~ consolidating the area by mortar, as fc~ the Lutetium gypsif~ous karst, near Paris, France. The degree of karstification may be characterized by a void index which re~esents the average of all a n ~ ! i e s shown by drill recordings. This void index is necessary to d e t e r m i n e the parameters concerning irAJection.
835227 CON~uu'A'AON UPON DOLCMITES OF THE S0%'I~WEbu'a,N TRANSVAAL Partridge, T C; Harris, G M; Diesel, V A Bull Imt Assoc E r ~ g Oeol, N2~, Dec 1981, P12~-135 The south-western part of the Transvaal Province, South Africa is ur~erlain by soluble dolomitic rocks and the development a ~ operation of the gold mines in this area has affected the perfc~mance of surface struct~es through groumdwater lowering in soil covered areas umderlain by cavernous dolomite. The paper describes some local developments imvolv~ng mine surface plant, utilizing the arching characteristics of compacted fills and caissom~ to ~ o v i d e economic four~latiom treatment above areas where the dolomite bedrock possesses a plr~macled configtlration, ar~ the various foundation t r e a t - - s fc~ a housing scheme covering a large area with highly variable soll cor~dtions.
835228 BEAEIS~
CAPACITY OF A STRIP FOUNDATION ON A
OOHESrVE AND ~ON H O M ~ E m ~ m S Bottero, A Rev Fr GeOtech, NI,
SOIL (IN F~E~ZH)
May 1982, P5-20
Presents an analysis, for the plane strain case, of the bearing capacity of a shallow foundation resting on a three-layered cohesive soil. Charts are Iresented of the bearing capacity ratio f ~ different relative thicknesses versus the geometrical and mechanical parameters of heterogeneity. 83522 9 CORROSION OF STEEL FILES DRIVEN IN SOYL DEPOSITS Ohsaki, Y Soils Found, V22, NS, Sept 1982, I~7-76 About 130 steel piles of L-shaped cross-section were driven into natural soll deposits at I0 locations with widely varying soil conditions. Prior to driving, the thicknesses of the piles were cease:red, and the soil conditions investi-
gated. The piles were withdrawn 2, 5 and i0 years after driving. It was concluded that : (i) average corrosion rates were aPlraximately 0 . 0 1 ~ y r for both faces of the piles, (2) no soil parameter was found that decisively influenced corrosion rate, and (3) the steel composition or treatment of the piles was not found to influence the corrosion effects.
835230 MODEL TESTS IN RELATION TO A METHOD TO REDUCE NEGATIVE SKIN FRICTION BY TAPERING A PILE. TECHNICAL NOTE Sawaguchi, M Soils Fotmd, V22, NB, Sept 1982, P130-133 Model tests were carried out using 4 piles with differing kinds of taper in sand to examine the method of using tapered piles to reduce negative skin friction. It is concluded that the method is effective, with the negative akin friction decreasing as the degree of taper increases. 835231 MC~EL TEST AND ANALYSIS OF NEGATIVE FRICTION ACTING ON PILES ~hibata, T; Sekiguchi, H; Yukitomo, H Soils Foumd, V22, N2, June 1982, P29-39 Model tests were performed to investigate the characteristics of negative friction on both vertical amd batter pile groups, and to assess the efficiency of bitumen in reducing these frictions. A method of estimating the group action of negative friction is derived and found to compare well with the model tests on vertical piles. Results fc~ the batter piles are found to agree with the Broms and Fredriksson model of batter pile flexural behaviour when subjected to s~rcmmding ground settlement. Results also indicate that bitumen coatings can reduce the negative friction to acceptable levels.
835232 EARTH PRESSURE ON PILES IN A RGW DUE TO LATERAL SOIL M ~ N T S Matsttl, T; Hong, W P; Ito, T Soils Fot~zl, V22, N2, June 1982, P71-81 A series of model tests on piles in a row was carried out on both clay and sand samples, in c~der to check the validity of a theoretical equation l~eVlously derived by the authors to estimate the lateral l~essure on piles due to soil movements. 835233 UPLIFT OF RIGID VERTICAL PILES IN FROZEN SAND Pocrooshasb, H B; Parameswaran, V R Soils Found, V22, ~2, June 1962, P62-88 Using a simple displacement field the vertical uplift behaviour of a single rigid pile embedded in a frozen sandy soil is analysed. Results of the aralysis are re~resented by curves from which the magnitude of the butt movement can be estimated fc~ given uplift forces. The proced~e outlined is directly applicable to piles embedded in moderately to heavily overconsolidated clay deposits. 835234 METHOD FOR ESTIMATING FOUNDATION ULTIMATE CAPACITY. TECHNICAL NOTE Akim~suru, J 0 Soils Found, V22, N2, June 1982, P89-91 A graphical method of estimating the ultimate failure load of a foundation is l~esented. The method allows c~nparison of different loading test results to derive safety factors.