... Abstract While the influences of 3D confinement on rock strength and brittle fracturing have been well researched, the 3D dilation/contraction characteristics of brittle rock have not received similar attention. Specifically, a key knowledge gap arises in relating the 3D directionality...

... elastic deformation strength experiment Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Damage evolution characteristics of rock under confining pressure and repeated blasting C.L. He North University...

... conditions. The evolution of damage was considered in this process, instead of testing different damage states of rock. Overall, there is only a theoretical possibility to accurately define the damage variable using resistivity. sandstone impedance strength saturation capacitance resistivity...

... curves allowed us to obtain the regression dependences of γ and K on D f and on the Hurst exponent H = 3 - D f . Our data are consistent with the model that generalizes classical Griffith and Barenblatt criteria for fractal cracks. 1 Introduction Strength of rocks is an important geo...

.... The testing conditions correspond to uniaxial compression test and Brazilian tensile test. Test results indicated that there is no remarkable strength increase under dynamic conditions as compared with that under static condition. 1 Introduction The dynamic mechanical behaviour and characteristics...

... uniaxial compression. The Z test method are used for determining the AE quiet period. The relationships between the characteristic strength and relatively tranquil initiation stress, and between the AE quiet period and the RA value and r value were also analyzed (where RA means rise time divided...

... parallel to fracture surface. fractal dimension dimension roughness upstream oil & gas reservoir characterization fracture strength journal chinese academy reservoir geomechanics granodiorite mechanism electron microscopy apparatus rock mechanic hydraulic fracturing particle...

... mechanic marble specimen strength sandstone specimen correlation static loading observation dic initiation sensitivity Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Observation of failure processes...

... steel high-strength frame, two commercial low-profile hydraulic cylinders, one hydraulic hand pump and a servo-controlled hydraulic press. The low-profile cylinders act as horizontal stress actuators while the hydraulic press provides with the vertical stress component. We describe the general outline...

... Hopkinson pressure bar (SHPB) system. A momentum-trap technique is utilized in the SHPB tests to ensure single pulse loading to the specimen enabling valid fragment size distribution. The dependence of dynamic uniaxial compressive strength on the irradiation duration and the loading rate has been discussed...

... Abstract The effects of commonly encountered mineral infills on shearing behaviour and shear strength development has not been extensively investigated, highlighting a need for further work. This paper compares the results obtained from a series of direct shear tests using replicates...

... the business. The mechanical performance of the material against the laboratory tests of wear caused by abrasive loads, internal friction or shock loss is dependent on the type and quantity of the various mineral constituents, especially the quartz content, the strength of the bonds between the mineral grains...

... affected by weathering due to the typically tropical climate. The strength profile of gneiss formations has been unusually investigated in Brazil, and one of the last published works is the one Marques et al. (2010) from gneisses from the city of Rio de Janeiro. On this context of lack of information...

... strength test, with prismatic proof bodies. With degradation tests in the field, it would be possible to predict the behavior of the material in the long term, correlating the degradation time in the field equivalent to the degradation time in the laboratory performed in this research. 1 Introduction...

... types of fibers available, evaluating the strength parameters: uniaxial compression, traction and residual strength of the concrete specimens reinforced with steel and polypropylene fibers in different concentrations. As a result, PROPEX brand polypropylene fibers at a concentration of 6 kg/m 3 proved...

... confining pressure the clayrich shale exhibits a little lower failure strength in the constant mean stress lateral decompression path than in the conventional triaxial compression path. The results reveal that results of the conventional triaxial compression tests would induce an overestimate...

... shear strength as well as corrugated sheath contact surface bonding. The test results indicate that load bearing capacity of the bonded length meets the design criteria. The obtained displacements of tests were also compared with analytical method displacement predictions which are generally much less...

... of the rocks. Between others, there are some requirements regarding the characteristics of the end surfaces of cylindrical specimens destined to be tested in compression strength tests: "They shall be flat to 0.02 mm, and shall not depart from perpendicularity of the specimen by more than 0.001 radian or 0.05...

... of the different rock mechanical parameters. It is essential to understand the behaviour of the jointed rock in order to choose the correct support system in the design phase. One of the main input parameters for stability calculation is the shear strength along discontinuities. The aim of this work is to study...

... geology reservoir characterization extraction castlegate sandstone operator strength maleki university book cliff coal field blackhawk formation maleki 2014 upstream oil & gas metals & mining gateroad seam rock canyon seam Rock Mechanics for Natural Resources and Infrastructure...