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Keywords: anhydrite
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Proceedings Papers
Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-201
... of sulphates is a process that involves flow of water and dissolution of anhydrite. Once solutions exceed the saturation limit, gypsum precipitates and crystallizes in the rock mass. This leads to heave and swelling pressures on structures but also on pressures within the rock mass around the underground...
Proceedings Papers
N. C. Ferreira, V. R. Marchesi, D. L. P. Domingues, J. O. Peixoto, J. N. Cruz, S. A. B. Fontoura, F. S. Cutrim, V. H. G. Pinto, C. J. C. Gonçalves
Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-366
... characterization halite artificial intelligence sequence upstream oil & gas reservoir geomechanics lithology drilling operation machine learning application sediment inclination morphology anhydrite knowledge santos basin algorithm figure 6 solubility frequency incidence chaos indicator...
Proceedings Papers
Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-100
... extensometers installed at the basement indicated that the heave displacement was associated with the expansion of the four upper meters of the foundation material. Mineralogical investigation by means of X-ray diffraction analysis identified anhydrite and gypsum in samples recovered from boreholes...
Proceedings Papers
Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-213
... as the tunnel approached completion. No indications of the presence of anhydrite and dissolved sulphates were known prior to tunnelling. Water samples had been taken from the beginning of construction and the concentration of anions and cat ions determined. Sulfate content was substantial, in one well...
Proceedings Papers
Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-334
... rather than bedded salt formations as host rocks, while in China, salt domes suitable for energy storage have been hardly found so far. Bedded salt rocks are usually composed of many thin salt layers and non-salt sedimentary interlayers (e.g. anhydrite, shale, dolomite, glauberite, etc.) (Li et al. 2007a...
Proceedings Papers
Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-331
.... On account of the geo-mechanical behavior of the main anhydrite which is different from that of rock salt, an in-situ test for this formation is also to be carried out. Subject: Underground storage of petroleum, gas and nuclear waste disposal Keywords: nuclear repository, case studies, field measurements...
Proceedings Papers
Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-327
... ABSTRACT Precipitation of gypsum crystals explains the severe swelling occurred in some tunnels crossing sulphate formations. The presence of groundwater and discontinuities, and the proportions of anhydrite and gypsum within the claystone rock mass play an important role for the development...
Proceedings Papers
Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-027
... of this phenomenon. To quantify the compaction, the lithology across the failure depth (3200 m for well M-42, as the first failed well) was reviewed and an interface between anhydrite (as a stiff rock) and marl (as a soft rock) was detected. To obtain static elastic parameters of the host rock, uniaxial compressive...
Proceedings Papers
Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-308
... hydrostatic pressures behind shaft liners in the longer term; and the development of potentially significant swelling pressures behind shaft liners in some anhydritic shales and marls when water is introduced to these formations. The approach adopted in designing the lining of a 7m finished diameter vertical...
Proceedings Papers
Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-032
... Karlsruhe Laboratory Testing Technique gypsum reduction structural geology concentration mechanism Reservoir Characterization hydration equilibrium Germany specimen Upstream Oil & Gas stress-strain relation anhydrite extrapolation pimentel clay particle final state...
Proceedings Papers
Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-229
... ABSTRACT A three dimensional constitutive law for swelling rock is presented. It can be applied to the osmotic swelling of mudstone as well as to the swelling of rocks containing anhydrite. It describes the development of time-dependent strains and stresses due to swelling considering elastic...
Proceedings Papers
Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-061
... of overburden (presence and thickness of salt layer in exploitation roof, presence of clayey rocks or hard rocks e.g. dolomite or anhydrite), presence of water-bearing strata and possibly natural brine levels, discontinuities, etc. are discussed. In the second part, the main features of mechanical behaviour...
Proceedings Papers
Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-212
...Micro- and macrofracturing at the boundary of rock salt and anhydrite Etude de la formation des microfissures et des macrofissures a la jonction des couches d'halite et d'anhydrite Beobachtung der Bildung von Mikro- und Makrorissen an der Grenze von Steinsalz und Anhydrit THSPIES, Federal Institute...
Proceedings Papers
Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-213
... column from bottom to top is as follows; C ' '< ~ Table 1: laboratoryand in-situdata of rock and rockmasses 1) Gypsum-Anhydrite: the bottom of this unit, is made of very p a plastic Iutite and clay, while in its upper part, a 20 to 30 ni layer of ,r" J r. I Cl(kwm~ ; r- mY', GSI anhydrite and laminated...
Proceedings Papers
Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-311
..., President of the ISRM for his kind words of introduction. hydraulic fracturing reservoir geomechanics Upstream Oil & Gas Einstein Artificial Intelligence underpressure resistance Coalescence Aristorena anhydrite mit geometric-mechanical model crack propagation mechanism Switzerland...
Proceedings Papers
Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-029
...Long time swelling of anhydritic rocks: Mineralogical and microstructural evaluation Gonflement de longue ouree de roches anhydres: Evaluation mineralogique et microstructurelle Langzeit-Schwellungen von wasserfreien Felsen: Eine mineralogische und mikrostrukturelle Bewertung R. NOESCH & F.T.MADSEN...
Proceedings Papers
Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-056
... swelling stress of the "anhydrite swelling", drillings, laboratory measurements of swelling strain and stress, petrographical and mineralogical investigations. The conversion of anhydrite into gypsum in the anhydrite containing shale is of special interest. ZUSAMMENFASSUNG: Ernsthafte Probleme mit...
Proceedings Papers
Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-072
... ABSTRACT: Anhydriceous sedimentary rocks start swelling when water has. access to them. The anhydrite is dissolved, and the sulphate crystallizes as gypsum when the thermodynamic equilibrium conditions require this. The embedding of water into the crystal lattice is linked with a volume...
Proceedings Papers
Paper presented at the 7th ISRM Congress, September 16–20, 1991
Paper Number: ISRM-7CONGRESS-1991-057
... drilling fluid management & disposal gonflement axial strain Reservoir Characterization Upstream Oil & Gas potentiel drilling fluids and materials swell test gypsum schweiz mineral specimen anhydrite clay fraction texture mineralogy clay-sulfate rock Madsen structural...
Proceedings Papers
Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-069
... between the relieved stress and the obtained swelling heave, also was used successfully for gypaum Keuper which contains swell- ing clay minerals as well ss anhydrite. The full re- versibility of the swell strains and stresses is not vslid in this csse. However, the action of the "physical" swelling...
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