... Abstract It is critical to obtain the rock strength along the wellbore to control drilling problems such as pipe sticking, tight hole, collapse and sand production. The purpose of this research is to predict the uniaxial compressive strength based on data of sonic travel time, formation...

... of every tested rock material was determined also. Uniaxial compressive strength of rock was evaluated then by conducting the compression test on every specimen. Empirical distribution of Shore hardness and dry unit weight variables obtained from laboratory tests was approximated by the best fitted...

... in uniaxial compression tests. The results from both methods correlate well and show that the crack initiation and crack damage thresholds are about 46% and 78% of the uniaxial compressive strength of the intact rock respectively, slightly higher than the results reported in literature from previous studies...

..., a need arose to find a method which could practically assess the uniaxial compressive strength (UCS) and Young's modulus of elasticity (E) based on easily determined material characteristics. Extensive testing of natural stone for the development and introduction of underground mining in quarries [4...

... Abstract The Uniaxial Compressive Strength (UCS) of intact rocks is an essential index of strength in rock engineering. Laboratory based direct compressive strength estimation may be problematic, as obtaining fresh samples is not always feasible. Thus, the aim of indirect methods index test...

..., aperture, filling, seepage, number of sets, block size and drill coring. Laboratory testing included: water content, porosity, density, absorption, swelling pressure, uniaxial compressive strength, point load test (PLT), Brazilian tensile strength (BTS) and direct shear test (DSH). A.L.T.E.A...

... Abstract The present study aims to employ modern intelligent method to predict intact rock strength parameters. This method can be used for intact rock strength parameters prediction of different extraction projects. Mechanical rock excavation projects need uniaxial compressive strength ( UCS...

... a complex assessment of strength properties (e.g., rebound hardness, uniaxial compressive strength, rock tensile strength) of multicomponent geomaterials, i.e., host-rocks and their enclaves, sampled both from quartz-rich (granitoid) and quartz-poor (syenitoid) massifs. 1. Introduction Rock mechanics...

... geomechanics displacement rock bolt procedia engineering 191 cavern excavation vertical displacement winn Singapore rock mass property excavation friction angle natural gas storage cavern underground storage cavern excavation uniaxial compressive strength rock mass Procedia Engineering 191...

... compressive strength only in international codes like the Eurocode. The limit states slope stability using the reduced uniaxial compressive strength does not provide the same factor of safety when the reduced equivalent Mohr-Coulomb (MC) parameters are utilized in the analysis. This study aims at developing...

... mechanical property Wellbore Design uc value uniaxial compressive strength procedia engineering 191 grout ratio internal friction angle shear strength Upstream Oil & Gas ml 0 stratabinder hs Aziz strata reinforcement grout sample Procedia Engineering 191 ( 2017 ) 1178 1184 1877-7058 ©...

... sandstones show different petrology from fine-grained to coarse-grained with silica, carbonate and clayey cement. The changes in rigidity as a function of temperature were documented. The analyzed data set includes the uniaxial compressive strength and indirect tensile strength measured at 22°C, 150°C, 300°C...

... ABSTRACT: Uniaxial compressive strength (UCS ) and Brazilian tensile strength (BTS ) are widely used in rock engineering. However, preparing standard samples for the strength tests may not always be possible for weak rocks. On the other hand, only rock fragments are available to estimate...

... correlation Reservoir Characterization reservoir geomechanics rock pillar strength Rock mechanics Upstream Oil & Gas uniaxial compressive strength dimension specimen discontinuity compressive strength rock mass equation Ayre da Silva pillar shape effect São Paulo Rock Mechanics...

... property porosity compressive strength pillar wall uniaxial compressive strength pillar Wellbore Design mechanics strength water content chalk recrystallization dissolution Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group...

... 1998, Ramamurthy 1986, Barton 2000, Bhasin & Grimstad 1996). Most of these equations consider uniaxial compressive strength of intact rock material (σ ci ) as a scale parameter. The UCS value of a rock mass (σ cm ) can be estimated by reducing the UCS of intact rock based on the classification...

.... The presence of vesicles within basaltic rocks has a direct impact on the uniaxial compressive strength (UCS) of the rock material. To investigate the relation between the UCS and vesicle ratio of basaltic rock, 32 core samples having a wide range of vesicle sizes were drilled from basaltic rock blocks taken...

... index (DRI) agreed well with uniaxial compressive strength. This confirmed that the results of mechanical properties based on UCS have a high level of reliability while evaluating the drillability. Nevertheless, the results of DRI did not represent any correlation versus Young's modulus during blasthole...

... and the RFC-system for estimating tunnel conditions in deep gold mines yielded similar rock strength values. Hoek-Brown method of rock mass strength determination resulted in unrealistically low uniaxial compressive strength and relatively low global compressive strength values. Behavior of 7 m wide stope...

.... The geometry of the failure surface is determined using calculus of variations. The effect of the strength parameters and the overburden on safety against uplift are studied using the derived solution. It is shown that uplift pressure increases significantly with the uniaxial compressive strength of the rock...