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Keywords: gneiss
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Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-119
... of rock mass in the region where is abundant of gneiss during geotechnical investigation, the author propose a new parameter RCL; combined with geological effect of alteration which is very normal in metamorphic rock, the author try to use the photos of the intact core in the field to substitute...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-174
... Anisotropy is a characteristic of intact foliated metamorphic rocks (slates, gneisses, phyllites, schists). Τesting was used to establish the anisotropic behaviour of selected gneissic rocks. The effect of anisotropy on various mechanical properties (strength, deformation) and dynamic properties...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-199
... ABSTRACT: The so-called "Stainzer Platten" gneiss is part of a regional ductile shear zone within the metamorphic Koralm core complex and has some practical importance due to its perfect fissility. Investigations on the rock fabrics revealed a characteristic mi-crocrack pattern besides...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-166
... bien que des tests geophysiques en premier. Les tests ont ete realises par huit sondages au bord du fleuve Pinheiros, dans un massif rocheux de gneiss avec foliation ayant pour objectif la determination de la conductivite hydraulique directionnelle anisotrope dans le volume du massifrocheux. Plus de...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-134
... ABSTRACT: The dynamic characteristics of an anisotropic rock ('Antigorio gneiss' from the Central Alps) were determined by means of measurements of P- and S-wave velocities. The investigated gneiss was found to be characterized by an orthotropic symmetry, its lower elastic modulus being...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-250
...=5m)ont ete realises selon la methode NMAT. Le tunnel traverse les gneiss à degre de fissuration et d"alteration variables; appartenant aux formations metamorphiques du primaire. Dans cette communication. on decrira les premiers resultats obtenus dans les chambres d"essaision proposera egalement une...
Proceedings Papers

Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-295
... à Windischeschenbach dans le Nord Est de la Bavière, Allemagne. Le forage a lieu au sein de roches metamorphiques (gneiss et amphibolites) en diamètre de 17 ½" jusqu" à la profondeur de 3 000 m, puis en 14 ¾". Le rôle des techniques de forage (composition de la bone, moteur de fond ou en rotary) comme causes d...
Proceedings Papers

Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-202
.... As the works progressed, this information was supplemented with detailed geotechnical explorations providing useful data to the designers.While most of the tunnel passes through competent granite gneisses a portion of the power tunnel is overlaid by a known weak zone - the Mebari Slide Zone made up of fluvio...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-010
..., showed that for isotropic, magmatic rocks no change in internal friction was observed. The drop in strength for these rocks must therefore be due to other effects as for instance the reduction in surface energy when the rock Specimens are covered with water. For anisotropic, mica-containing gneisses...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-126
... Summary Deformability characteristics of Upper Cretaceous and bituminous limestones as well as of gneisses were studied before and after grouting. Deformation tests were carried out in galleries by applying a uniform load over the circular area of 80 cm dia. The measured settlements...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-049
... these products predict the behaviour of rocks according to the familiar principles of soil mechanics. Based on a statistical analysis of the mechanical properties of weathered bedrock (granite gneiss and mica schist), it is shown that the decrease in strength of the less weathered deeper substrata (for fully...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-051
... is formed mainly of two types of rocks namely of a fine grained biotite gneiss and amphibolite. The two types of rocks show local different in the degree of jointing and intensity of weathering which affected particularly gneiss. In places the gneiss was entirely decomposed to micaceous sandy clay of hard...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-069
..., un essai d'absorption d'eau permet d'apprecier la porosità. Nous avons applique ces essais à douze roches differentes, calcaires, gneiss, et notamment cinq lots representant les principales varietes du site de barrage de Malpasset. Malgre une dispersion un peu plus grande que celle des essais sur...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-050
... or to that in friction? In Fig. 2a four lines of shear strength of three types of rock masses are presented resulting from field shear tests on blocks. The line [I] belongs to a gneiss sheared along the heads of the outcrops of nearly vertical planes of foliation. If the direction of shear stress is perpendicular...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-239
... sur gneiss et diabases en different etat de destruction. On a effectue les recherches tant sur les gneiss injectes que sur ceux non-injectes. L'analyse des resultats experimentaux montre: la rationalite d'utilisation de la formule à deux termes avec deux paramètres de calcul de la resistance au...

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