... of consolidated-undrained triaxial tests (CU) performed under low confining pressure (50, 150 and 300 kPa) to several sets of core specimens carved with different orientation of the tectonic fabric. We analyse strain-stress relationships of each test, as well as failure modes, obtaining a brittle behaviour...

.... The technology of making specimens of preset shape from artificial geomaterials (graded sand, mixed with cryogel) having poroperm properties as well as deformation and strength characteristics similar to high-permeable reservoir rocks (as laboratory tests have shown) is developed and trialed. The test bench...

... Abstract In this paper, a numerical investigation of uniaxial compressive tests on prismatic specimens with single cylindrical pre-existing cavities in brittle rock is performed. To investigate the rock fracture around cavities and to assess the potential of the numerical model to simulate...

...]. Upstream Oil & Gas uniaxial compressive strength test michael alber procedia engineering 191 crack damage reservoir geomechanics confinement mineralogical composition different method Reservoir Characterization axial stress specimen granite strength triaxial test experiment determination...

... expansion clay mineral Upstream Oil & Gas quartz specimen limestone spectra structural geology pavel konecny thermal expansion somaliland cement plant Republic konecny Procedia Engineering 191 ( 2017 ) 43 50 Available online at www.sciencedirect.com 1877-7058 © 2017 The Authors...

... stress levels on water-permeability of the specimens is investigated. 1. Introduction Planning the exploitation of hydro-geothermal systems requires geophysical parameters from seismic and borehole measurements as well as the quantification of rock (hydro-) geomechanical properties in the laboratory...

... Abstract Based on laboratory testing of bedded specimens made of artificial geomaterial, meta-siltstone and schist subjected to uniaxial compression and triaxial compression by the Karman scheme, the deformation and strength characteristics of the materials are determined as functions...

... uniaxial compressive strength granite crack initiation reservoir geomechanics Lac du Bonnet granite kallimogiannis stress-strain data Reservoir Characterization specimen procedia engineering 191 uniaxial compression test Procedia Engineering 191 ( 2017 ) 1108 1116 1877-7058 © 2017...

... on creation of secondary degradation of the near-surface zone of samples which is not caused by natural processes is examined. 1. Introduction Detailed analysis of inner structure of rock specimens is crucial to better understand the properties of rock materials related to the geometrical shape...

... Abstract Axial splitting is an important failure mechanism in rock engineering. This failure mechanism is particularly observed in the vicinity of free surfaces of rock structures. Different possibilities such as existence of defects, pores and micro-cracks in the rock specimen have been...

... behaviour, and the mechanical properties, i.e. strength, are changed in different directions of loading. This change of strength is called the strength anisotropy. The main purpose of this research is to analyze the effect of the orientation of metamorphic foliation distinguished within the rock specimens...

... ehringhausen procedia engineering 191 cement integrity compressional wave velocity Reservoir Characterization Upstream Oil & Gas displacement specimen elastic property Procedia Engineering 191 ( 2017 ) 164 171 1877-7058 © 2017 The Authors. Published by Elsevier Ltd. This is an open access...

... is usually laminated. In order to get an insight into the influence of different lamination factors on size effect, cubic rock specimens with different sizes, stress directions, lamination orientations and lamination spacing were tested under true tri-axial conditions with 3DEC. The results show that regular...

... to achieve the theoretical foundation of the Brazilian splitting test, a Flattened Brazilian Disc (FBD) specimen can be used as an alternative, which prevents local crack initiation. An FBD specimen, because of its ease of sample preparation and loading geometry, can be used to estimate different...

... rate of 0.2 kN/s. Tests are performed on different diameters samples and desirable failure modes are recorded. Tensile strength values recorded at slow loading are obtained to be different for specimen having different diameters. However, strength of rock in engineering problems like blasting, mining...

... in this paper. Upstream Oil & Gas drilling performance bit selection cement cement paste specimen cross flow Reservoir Characterization fundamental drillability experiment waterjet waterjet drilling drilling operation good drilling performance specimen abnormal formation pressure...

... and/or between mineral grains in inhomogeneous rocks. A fracture process of numerical specimens which are prepared using X-ray CT image of African granites is studied. The analysis of material parameters, such as Young's modulus and tensile strength of minerals contained in the granites, is conducted to examine...

... Abstract The objective of this study is to examine any variation from micro to macro scale mode-I fracture toughness of granite using micro-sized specimen and semi-circular specimen. The rock used in the tests is Iksan granite (Korea) which is composed of minerals, such as plagioclase...

.... Knowledge of the mechanical behavior of rocks under triaxial stress conditions comes mainly from the Karman-type triaxial tests (conventional triaxial test) where a cylindrical specimen is axially loaded keeping the lateral load constant. However, the stress path that is specific to these tests is certainly...

... to as Godula sandstone) was used. The chevron-notched cylindrical specimens with the diameter of 29 mm and 120 mm nominal length were prepared from the sandstone blocks. These specimens were subjected to the Chevron Bend (CB) test carried out in accordance with the ISRM suggested methodology; the span was 94...