... alteration of olivine, pyroxene, plagioclase and natural glass. Some zeolites also are capable of swelling. The swelling pressures which developed within the basalts when expansive clay minerals took up water could exceed the tensile strength of the rock and therefore led to its breakdown. Whether...

... purposes. There has been a tendency to also use the resulting empirical ratings to determine the constitutive laws as well as failure criteria now employed with the majority of numerical models. Upstream Oil & Gas alteration Artificial Intelligence practical consideration strength rock mass...

... of the fluids which are percolating in the rock. In a hydrothermal system, evidences of paleofluid movements in rocks are mostly recognized when fluid-rock interaction occur, yielding an alteration of previous mineral assemblages. In the case of superposition of 2 or 3 alteration stages in the same area, it may...

..., is installed. During tests which were carried out in an Operational mine alterations of stresses as a result of mining work were ascertained. Stress monitoring measurements that were taken in the vicinity of the dam at the Ingouri underground hydro-electric power station during construction indicated...

... as an AE signal or a discrete AE event. In a recent study the nature of the observed AE behavior, and the possible petrographic interpretation, were investigated in five different Spanish granites ranging in their state of alteration from sound to Weathered rocks. These granites were loaded...

... value by Schmidt test hammer was obtained to hit the smoothly prepared surface downward by N-type hammer. The process of mineral destruction and alteration were mainly measured by microscopic observation, X-ray powder diffraction method and differential thermal analysis. Experimental Results...

... propagation velocity, from less than 1600 m/s up structural geology ity MPa Upstream Oil & Gas alteration execution Reservoir Characterization Portugal South Portugal weak carboniferous formation classification Lisboa geotechnical characterization geotechnical classification rock mass...

.... Characteristics of Neogene Tertiary Sedimentary Rocks Green tuffs have various physical properties ranging from hard gravels to clays with high swelling properties when immersed in water. Sometimes altered clay, that is solfatalic clay, has been produced by hydrothermal alteration. Solfatalic clay contains large...

... and is abundant in completely weathered rocks. Most of the halloysite probably results from breakdown of plagioclase feldspar, but some may also come from alteration of illite. These studies should lead to a better understanding of the physical properties of weathered greywacke sandstone, which has been...