Mechanical behaviour of aggregates related to the physico-mechanical properties of rocks (in French)

112A 854027 Simple and inexpensive pressure control equipment for conventional and stress path triaxial testing of soils. Technical note Atkinson, J H Geoteclmique V35, N1, March 1985, P61-63 854028 Some fall-cone tests. Technical note Wood, D M Geotechnique V35. N1, March 1985, P64-68 Fall cone tests have been used to determine the liquid limit of cohesive soils, and estimations of strength and sensitivity have been possible by making correlations with other strength measurements. Recent theoretical analyses allow a direct estimation of strength from fall-cone tests. Results of some fallcone tests performed with cones of different angles are presented together with results of some vane strength tests. The relation between cone penetration and strength is compared with theoretical predictions and with earlier experimental correlations. 854029 Mechanical hehaviour of aggregates related to the physicomechanical properties of rocks (In French) Ballivy, G; Dayre, M lnt Assoc £ngng Geol Bull N29. June 1984, P339-342 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) The stresses applied to aggregates undergoing laboratory testing are discussed. Good correlation was found between compressive or tensile strength and Los Angeles, Deval and Micro-Deval test results, which was explained using rock mechanics and comminution principles. Systematic use of conventional rock mechanics tests on samples from quarries may help to optimise the utilisation of marginal aggregates. 854030 Determination of untreated gravels mechanical characteristics with cyclic loading triaxiai apparatus (In French) Paute, J L; LeFort, R lnt Assoc Engng Geol Bull N29, June 1984, P419-424 (paper to the International Symposium on Aggregates, Nice, 21-23 May 1984) Apparatus has been developed in the Laboratoires des Ponts et Chaussees which is sufficiently sensitive to discriminate between different aggregate samples. Cyclic and non-cyclic triaxial testing is used to determine the stress strain relationships of a range of aggregates. 854031 Suggested method for determining point load strength ISRM Comm on Testing Methods Int J Rock Mech Min Sci V22, N2, April 1985, P51-60 The point load strength test is intended as an index for rock classification and characterization. A revised account of this suggested method is outlined. The apparatus, procedure, calculations and results of the tests are described. 854032 Equivalent core diameter method of size and shape correction in point load testing Brook, N lnt J Rock Mech Min Sci V22. N2, April 1985, P61-70 Developments in the Point Load Test, which lead to the possibility of using relatively unprepared rock lumps, are reviewed. A method of correcting results obtained from non-standard sizes of core specimens by multiplying by a factor is described, as is a method of correcting shapes, not circular in cross-section, by calculating an "equivalent core diameter'. The wide ranges of

possible test specimen source, shape and size, together with the choice of the most convenient calculation method are considered. The tests' usefulness is considered, with applications for compressive strength estimation, rock mass classification. estimation of triaxial behaviour and small scale physical model testing. Auth. 854033 Strength of unsaturated mixtures of sand and kaolin and the concept of effective stress Mullins, C E; Panayiotopoulos, K P J Soil Sci V35. N3, Sept 1984, P459-468 Pastes of fine and coarse sands containing 0-80g kaolin per kg were equilibrated at matrix potentials from -2 to - 1000kN per sq m or allowed to air dry. Cylindrical samples were tested in unconfined compression and by indirect tensile testing. The measured strengths are explained using the Coulomb-Mohr theory and the concept of effective stress. Effective stress is the dominant factor in determining compressive and tensile strength when pore water tension exceeds 10kN per sq m. 854034 Strength and deformation characteristics of saturated sand at extremely low pressures Fukushima, S; Tatsuoka, F Soils Found V24, N4, Dec 1984, P30-48 854035 Preparation of a normally consolidated clay stratum in a centrifuge Kimura, T; Kusakabe, O; Takemura, J', Saitoh, K Soils Found V24, N4, Dec 1984, P71-83 Describes how a normally consolidated clay stratum, of which water content decreases nearly linearly with depth or of which undrained strength increases nearly linearly with depth, can be prepared in a centrifuge. Detailed measurements of pore pressures during centrifuge consolidation were carried out in order to estimate the undrained strength of the clay. 854036 Anisotropic deformation-strength properties of soft sedimentary rock 'Shiraso' originated from pyroclastic flows Haruyama, M; Kitamura, R Soils Found V24, N4, Dec 1984, P84.94 A study of shear characteristics of Shirasu (local name given to deposits ranging from soft soil to hard rock, becoming granular soil when disturbed) in an undisturbed state. The anisotropy of deformation-strength behaviour is investigated from the results of drained triaxial compression tests on the specimens obtained at various inclinations to bedding plane. 854037 Undrained cyclic shear strength of a dense Niigata sand Yoshimi, Y; Tokimatsu, K; Kaneko, O; Makihara, Y Soils Found V24, N4. Dec 1984, P131-145 Presents laboratory test results of undrained cyclic strength and deformation characteristics (cyclic mobility) of undisturbed samples of a saturated Niigata sand obtained by the in situ freezing method. Results are compared with those of so-called undisturbed samples obtained by a conventional tube sampling method and of reconstituted samples at the same density.