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Investigation of soft foundations with surface reinforcement
l!8A
In orde~ to assess the feasibility of constructing sockets in highly Jointed silurian mmlstone for the construction of twin bridges over the Yarra River, Melbourne, Australia, two test Piles were constructed and loaded to failure. An end-bearing test was carried out on one pile and a side resistance test on the other. This work was supported by detailed geologic logging, triaxial tests on intact rock samples and l~essurameter tests. The results of the Pile tests stud presst~emeter tests have been related to Joint frequency. 825167 INVESTIGATION OF 802~ FOUNDATIONS WITH SURFACE REINFORCEMENT Chta, H; Mochinaga, R; Kurlhara, N Proc 3rd Australia-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, VI, P123-128. Publ Wellir~ton: New Zealand Institution of Engineers, 1980 A finite element analysis of an ideallsed model suggests that transverse surface reinforcement at the bottom of an e a S a r ~ n t placed on very soft foundations can considerably reduce the amount of defcrmation of the foumdation amd improve the bearing capacity. Good agreement is found with results back analysed from a field trial embankment.
Slopes
825171 HEARING CAPACITY OF SLOPES UNDER STRIP LOADS ON THE TOP SURFACES Kusakabe, O; Kimurap T; Yamaguchi, H Soils Foumd, V21, E~, Dec 1981, P29-40 The bearing capacities of slopes loaded on top surfaces were calculated usimg the upper bourd theorem and results were compared with other theorems. Model tests using Eanto loam were carried out %o study the applicability of the upper bound method. There was found to be good agreement, with the theory yielding slightly higher values than the observations.
Hydraulic structures 825172 MEASURING RESerVOIR GROUND MOVEMENTS Ashkenazi, V; Dodson, A H; Jones, D E B Civ Engng, London, Feb 1982, PB5-43 Describes the instrumentation and monitoring system set up to observe ground movements at the Queen Mother reseTvoir, Datchet, UK. Data processing with the use of computer programs and models is outlined.
Earth retaining structures 825173 SOIL REINFORCING - CURRENT PRACTICE Ingoldj T S Civ E~gr~, Lor~lon, April 1982, P61-65
See also: 825181
825168 CRITICAL ANALYSIS OF SOME VARIATIONAL ME'INODS IN SLOPE STABILITY ANALYSIS Castillo, E; Luceno, A Int J Num Anal Meth Geomech, V6, N2, AprilJune 1982, P195-209 Examines the validity of methods proposed by Baker arzl Garber, Chen, and Castillo and Ra~illa, and demonstrates that the first 2 methods are incorrectly stated, and that the third method is correct for the case of a frictiollless soil. 25 refs. 825169 LESSONS FROM LE COTEAU LANDSLIDE, GATINEAU, QUEBEC. TECHNICAL NOTE McRostie, G C; St Louis, M W Can GeOtech J, V18, N4, Nov 1981, P592-599 Describes events occurring after a landslide in Quebec, Canada; This included a technical study of the stability of the remainirg hillside, from which it was recommended that slope flattening measures should be undertaken, actions of the bodies involved (the municipal council, building contractors and insurance companies) and subsequent lawsuits.
825170 MULTIDISCIPLINARY STUDY OF PROBLEMS ARISING FRCM A LANDSLrDE ON A SLIGHT SLOPE (IN FRENCH)
Giraud, A; Gourc, J P; Besson, L Rev Fr Geotech, NI4, Feb 1981, P57-66 Presents a case study of a landslide over a slight inclination in clay near Monestier du P~cy, near Grenoble, France. The geological conditions of the slide, a mechanical analysis of the failure conditions, including a stability amalysis, are described. Restoration measures are then discussed.
Describes 4 proprietary systems for soll reinforcement in use in the UK: the Reinfcrced Earth system, the York system, the Websol system and a gabion-faced wall system. 825174 COMPARISON OF FABRIC SHEET-REINFORCED EARTH DESIGN METHODS. TECHNICAL NOTE Nicholls, R L Can Geotech J, VI8, N~, Nov 1981 P585-592 The Coulomb failure plane method of design is compared with a sliding block design method for fabric sheet-reinforced retaining walls. The quantities of anchorage material required are calculated for both methods. Bench model tests are used to compare the surcharge loads resisted by given quantities of anchorage material distributed over a range of geometries between those indicated by the 2 design methods. 825175 PERFORMANCE OF T ~ R A R Y TIE-BACKS UNDER WINTER CONDITIONS. TECHNICAL NOTE Morgenstern, N R; Sego, D C Can Geotech J, VI8, E~, Nov 1981, P566-572 Construction of an underpass required the temporary relocation of the railway prior to constructlon of a permanent bridge. The new llne was placed close to the underpass excavation which was supported by a tle-back sheet pile wall. Observations of the tie-back loads from January to July 1977 are presented. The variation of load with time bears a strong carrelatlon with average air temperature anl is accounted for by the alternate freezing and thawing of the grounl adjacent to the sheet pile wall. The ultimate decline in load is attributed to relaxation of the soll due to spring thaw.
In orde~ to assess the feasibility of constructing sockets in highly Jointed silurian mmlstone for the construction of twin bridges over the Yarra River, Melbourne, Australia, two test Piles were constructed and loaded to failure. An end-bearing test was carried out on one pile and a side resistance test on the other. This work was supported by detailed geologic logging, triaxial tests on intact rock samples and l~essurameter tests. The results of the Pile tests stud presst~emeter tests have been related to Joint frequency. 825167 INVESTIGATION OF 802~ FOUNDATIONS WITH SURFACE REINFORCEMENT Chta, H; Mochinaga, R; Kurlhara, N Proc 3rd Australia-New Zealand Conference on Geomechanlcs, Wellington, 12-16 May 1980, VI, P123-128. Publ Wellir~ton: New Zealand Institution of Engineers, 1980 A finite element analysis of an ideallsed model suggests that transverse surface reinforcement at the bottom of an e a S a r ~ n t placed on very soft foundations can considerably reduce the amount of defcrmation of the foumdation amd improve the bearing capacity. Good agreement is found with results back analysed from a field trial embankment.
Slopes
825171 HEARING CAPACITY OF SLOPES UNDER STRIP LOADS ON THE TOP SURFACES Kusakabe, O; Kimurap T; Yamaguchi, H Soils Foumd, V21, E~, Dec 1981, P29-40 The bearing capacities of slopes loaded on top surfaces were calculated usimg the upper bourd theorem and results were compared with other theorems. Model tests using Eanto loam were carried out %o study the applicability of the upper bound method. There was found to be good agreement, with the theory yielding slightly higher values than the observations.
Hydraulic structures 825172 MEASURING RESerVOIR GROUND MOVEMENTS Ashkenazi, V; Dodson, A H; Jones, D E B Civ Engng, London, Feb 1982, PB5-43 Describes the instrumentation and monitoring system set up to observe ground movements at the Queen Mother reseTvoir, Datchet, UK. Data processing with the use of computer programs and models is outlined.
Earth retaining structures 825173 SOIL REINFORCING - CURRENT PRACTICE Ingoldj T S Civ E~gr~, Lor~lon, April 1982, P61-65
See also: 825181
825168 CRITICAL ANALYSIS OF SOME VARIATIONAL ME'INODS IN SLOPE STABILITY ANALYSIS Castillo, E; Luceno, A Int J Num Anal Meth Geomech, V6, N2, AprilJune 1982, P195-209 Examines the validity of methods proposed by Baker arzl Garber, Chen, and Castillo and Ra~illa, and demonstrates that the first 2 methods are incorrectly stated, and that the third method is correct for the case of a frictiollless soil. 25 refs. 825169 LESSONS FROM LE COTEAU LANDSLIDE, GATINEAU, QUEBEC. TECHNICAL NOTE McRostie, G C; St Louis, M W Can GeOtech J, V18, N4, Nov 1981, P592-599 Describes events occurring after a landslide in Quebec, Canada; This included a technical study of the stability of the remainirg hillside, from which it was recommended that slope flattening measures should be undertaken, actions of the bodies involved (the municipal council, building contractors and insurance companies) and subsequent lawsuits.
825170 MULTIDISCIPLINARY STUDY OF PROBLEMS ARISING FRCM A LANDSLrDE ON A SLIGHT SLOPE (IN FRENCH)
Giraud, A; Gourc, J P; Besson, L Rev Fr Geotech, NI4, Feb 1981, P57-66 Presents a case study of a landslide over a slight inclination in clay near Monestier du P~cy, near Grenoble, France. The geological conditions of the slide, a mechanical analysis of the failure conditions, including a stability amalysis, are described. Restoration measures are then discussed.
Describes 4 proprietary systems for soll reinforcement in use in the UK: the Reinfcrced Earth system, the York system, the Websol system and a gabion-faced wall system. 825174 COMPARISON OF FABRIC SHEET-REINFORCED EARTH DESIGN METHODS. TECHNICAL NOTE Nicholls, R L Can Geotech J, VI8, N~, Nov 1981 P585-592 The Coulomb failure plane method of design is compared with a sliding block design method for fabric sheet-reinforced retaining walls. The quantities of anchorage material required are calculated for both methods. Bench model tests are used to compare the surcharge loads resisted by given quantities of anchorage material distributed over a range of geometries between those indicated by the 2 design methods. 825175 PERFORMANCE OF T ~ R A R Y TIE-BACKS UNDER WINTER CONDITIONS. TECHNICAL NOTE Morgenstern, N R; Sego, D C Can Geotech J, VI8, E~, Nov 1981, P566-572 Construction of an underpass required the temporary relocation of the railway prior to constructlon of a permanent bridge. The new llne was placed close to the underpass excavation which was supported by a tle-back sheet pile wall. Observations of the tie-back loads from January to July 1977 are presented. The variation of load with time bears a strong carrelatlon with average air temperature anl is accounted for by the alternate freezing and thawing of the grounl adjacent to the sheet pile wall. The ultimate decline in load is attributed to relaxation of the soll due to spring thaw.