... of the information gathered shows that 50% of the cases correspond relate to chalk mines, 32% to limestone mines, and 16% to gypsum mines. Two case studies presented in the paper were also analyzed in more detail. Complexity of the water-rock interaction and the importance of studying more precisely the various...

... ABSTRACT: The chalk cliffs are regularly subject to mass collapse phenomena in Normandy region (France). These instabilities represent some problems to manage for local authorities. In some cases, the chalk cliffs contain one or more galleries of anthropogenic origin and hazard assessment...

... ABSTRACT: The paper deals with the effect of water saturation degree on the stress–strain response of a high-porosity and pure chalk, the Chateau-Landon chalk. A general experimental methodology is presented, including hydrostatic and triaxial compression tests performed under drained...

... Abstract The shallow underground room-and-pillar mines where chalk rocks were extracted are now abandoned and are enduring the effects of time and weathering which increase their risk of collapse. The Parisian Basin in France contains many abandoned underground chalk mines and number of them...

... reservoir characterization discontinuity drilling quarry chalk fracture accident france strength reservoir geomechanics pillar stability figure structural geology vault circumstance diaclase figure 7 brgm chalk quarry orientation paris gallery Abstract A vault...

... characterization process includes full-spectral analysis, 3-D source location, waveform cross correlation and source magnitude evaluation. In this paper, we present the application of NM techniques to the detection of incipient instabilities around shallow caverns excavated in soft and homogenous chalk. We present...

... Reservoir Characterization Simulation enhanced recovery experiment chalk mechanical behaviour injection coefficient expression water sensitivity Upstream Oil & Gas chalk reservoir reproduce Schroeder waterflooding compaction suction equation mechanics reservoir suction...

... flint particle particle specimen MPa strength Rock mechanics test specimen uc value test result point load 3 Cray programme discontinuity investigation preparation flint chalk unconfined compressive strength ABSTRACT Data are presented from two sites in southeast England...

... ABSTRACT: Tensional strengths of high porosity outcrop chalks with different saturation fluids have been measured both in direct and Brazilian tests. The direct tests are based on shaping the chalk samples in a lathe so that the samples could be mounted in the test rig without any gluing...

... ABSTRACT: Some uniaxial compression tests were realized on isotropic (chalk) and anisotropic (shale) rocks. At regular times during each Test, ultrasonic signals (P waves) were recorded. There no notable variation was observed in the propagation velocities, the interpretation has been realized...

... Wellbore Design structural geology consolidation Reservoir Characterization Upstream Oil & Gas pore pressure wellbore integrity monjoie testing procedure pore collapse interpretation axial strain waal time-dependent behaviour uniaxial test chalk diagram deformation chalk...

...Excavation and support optimisation for a large underground storage facility in weak jointed chalk Erstellung und Optimierung des Ausbaus fOr einen Untertagespeicher in wenig standfester Kreide Excavation soutenement optimisation d'un grand reservoir souterrain dans des rochers carbonatiques...

... of approximately 41 km would have been up to 110 m below mean sea level and between 40 and 60 m under the sea bed. The general geologic structure had been well defined over the years. The simplified succession of strata in which the tunnel would lie comprised an upper layer of Middle and Upper Lower Chalk...

... upstream oil & gas variation auscultation slsffilque situ voute excavation amplitude contrainte amortissement reservoir characterization echantillon kreide moyenne longitudinale serie mesure sismique par craie souffilse chalk The PDF file of this paper is in French...