843074 In-situ deformability vs weathering of a granite rock in Bar- celona (Spain) ,: Romana, M; Simic, D Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V1, PA93-A99. Publ Rotterdam: A. A. Balkema, 1983

A 17m deep test shaft was excavated through a soil succession corresponding to the weathering profile of a granite subsoil as part of the geotechnical investigations for the Barcelona Sub- way, Spain. Sixteen horizontal and five vertical plate load tests were carried out at different depths to assess the relationship between rock weathering and deformability. It was concluded that the weathering of the rock mass significantly increases its deformability.

843075 Method to evaluate the deformation behaviour of dis- continuous rock mass and its applicability Yoshinaka, R; Yamabe, T; Sekine, I Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PA125-A128. Publ Rotterdam: A. A. Balkema, 1983

A method to evaluate the deformability of rock masses is pre- sented, considering the geometrical and mechanical properties of discontinuities and the mechanical properties of intact rock. Constitutive equations to represent normal joint and shear stiff- nesses varying against stress-deformation are introduced. The applicability of the method is demonstrated by means of bi- axially loaded large-scale rock mass models in the laboratory and by numerical analysis.

843076 Strain and fatigue behaviour of rock (In French) Homand-Etienne, F; Mora, S; Houpert, R Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V1, PA129-A132. Publ Rotterdam: A. A. Balkema, 1983

The cyclic fatigue phenomenon in granite and marble was in- vestigated by cyclic loading in uniaxial compression. General evolution of damages and strains can be observed by means of a three phase cyclic creep and by evolution of the hysteresis loops' geometry. It is concluded that the development of fatigue failure in rocks is closely related to their petrographical, physical and mechanical properties.

843077 Study of stratified rock masses by means of large-scale tests with an hydraulic pressure chamber Oberti, G; Goffi, L; Rossi, P P Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PA133-A 141. Publ Rotterdam: A. A. Balkema, 1983

To identify the elastic constants of stratified rock, large-scale, in-situ tests were carried out inside two 3m diameter tunnels through alternating sandstone and marl. The influence of stratification is analysed with reference to the equivalent crystalline anisotropy. The results, obtained by the hydraulic pressure chamber technique, were analysed by the finite element method and compared favourably with theoretical results.

89A

843078 Strength deformation and rupture characteristics of red sand- stone under polyaxial compression Gau, Q; Cheng, H; Zhuo, D Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PAI57-A160. Publ Rotterdam: A. A. Balkema, 1983

10crn cube specimens of Cretaceous red sandstone were tested polyaxially under rigid and flexible contact. Results of flexible contact tests showed that: compressive strength of the rock is higher, the surface of rupture is better defined and the deforma- tions along different principal directions are interchangeable. In these tests, therefore, the load pressure is more uniform and the frictional constraint so small that the intrinsic rock mechanical properties are more accurately assessed.

843079 Experimental investigations and forecast of deformations and failure mechanism in rock masses Baklashov, I V; Ardashev, K A; Kartashov, U M; Alekseiev, A D Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 V1, PB65-B68. Publ Rotterdam: A. A. Balkema, 1983

Uniaxial and triaxial loading tests were carried out on fissile shales, sand shales, limestones and sandstones. The results of the investigation were used in the prediction of load-bearing layers in rock masses and in mining technology development.

T i m e dependent behav iour

See also: 843033, 843059, 843264

84308O Formulation of stress-strain-time behavior of soils under deviaturic stress condition Murayama, S Soils Found V23, N2, June 1983, P43-57

The fundamental stress-strain-time relationships of soil skeletons including sand and clay are theoretically formulated for various stress levels and simulated by a mechanical model. By application of this model, characteristics proposed in pre- vious studies and some new characteristics in the viscoplastic state and at creep failure are derived.

843081 Creep of rock based on long-term experiments Ito, H Proc 5th Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PAI I7-AI20. Publ Rotterdam: A. A. Balkema, 1983

On the basis of results of long-term creep tests carried out on granite beams, it is concluded that rock can flow as a viscous li- quid without any yield stress. It is possible that the creep of the rock depends on the confining pressure.

843082 In-situ determination of creep properties of rock salt Ladanyi, B; Gill, D E Proc 5tb Congress of the International Society for Rock Mechanics, Melbourne, 10-15 April 1983 VI, PA219-A225. Publ Rotterdam: A. A. Balkema. 1983

The results of short- and long-term high capacity borehole dilatometer tests performed in confined blocks of rock salt un- der simulated in-situ conditions are described. Using the pro- posed interpretation method the tests enable rheological parameters of rock salt to be determined: the first loading and cyclic loading rigidity moduli, the short term tensile strength, a