... that needs to be addressed. However, the parameters governing the shear strength of this failure mode are associated with large uncertainties and are difficult to assess due to the existing dam. This keynote paper presents a summary of the work performed at the Division of Soil and Rock Mechanics, KTH Royal...

... Abstract Shear strength along rock discontinuities by means of direct shear strength tests were performed on granitic and clayey rocks. Both rock types represent potential host rocks of radioactive waste. The paper focuses on the effect of one parameter in particular influencing the shear...

... for joints roughness assessment, without the need for expensive and time consuming laboratory tests or subjective empirical methods. In this study, a new photogrammetric method was used to estimate the roughness, shear strength and friction angle of a discontinuity of 2 m by 1 m fresh rock joint...

... are thawing, resulting in a significant shear strength reduction. In this review, we will discuss the various existing design methods in the context of the phenomena involved in the formation of frozen rock and the behaviour of thawing rock. We will show the deficiencies of these methods and highlight...

... in total shear strength of the cable bolt. 1. Introduction Mining in Australia is one of the safest industries but there are still some fatal accidents. The number of deaths was 10, 13 and 13 in 2013, 2014 and 2015 respectively [1]. The current emphasis is to towards zero fatality Therefore, one...

... Abstract An experimental study was carried out on grout samples prepared from both Stratabinder and BU100 cementitious products. Samples were prepared with various water to grout ratios and tested for uniaxial compressive and shear strength. Triaxial tests were performed on cylindrical samples...

... execution, the model will become more accurate and quantitative (especially the roughness profiling). 1 INTRODUCTION Over many years, fine sediments resulting from weathering and other surface processes could subsequently ingress to rock joints, reducing the overall shear strength of the joint surface...

... fracturing anisotropic slate cleavage shear strength Upstream Oil & Gas Bochum specimen hydraulic fracture ruhr-university bochum schistosity Reservoir Characterization orientation slate engineering geology rock engineering triaxial strength reservoir geomechanics perpendicular strength...

... Abstract Some rock engineering designs are based on the Barton shear strength criterion for rock joints. One of the more relevant input parameters of this criterion is the basic friction angle. Nevertheless, no method is suggested to determine this value. Initially, the basic friction angle...

... Abstract This study deals with the comparison of the results of shear tests conducted under conditions of constant normal load (CNL) and constant normal stiffness (CNS). The aim was to investigate whether the shear strength results of the two test procedures are comparable and whether...

... strength is more important, according to models of Patton and Barton (the most important classical limit equilibrium models of forces) the participation of the asperity shear strength is lower, vanishing hyperbolically with increasing σ n (Leal-Gomes & Dinis-da-Gama 2014a). At least in matched...

.... Johansson Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, Stockholm, Sweden D. Mas Ivars & A. Sánchez Juncal ITASCA Consultants AB, Stockholm, Sweden ABSTRACT: Rock mechanical problems are often governed by the shear strength of joints, but assessing it theoretically...

... with the percentage of Sulphuric Anhydrite and also up to some extent it is inversely proportional to the per- centage of Chloride. For resin capsule it has been established that both the compressive strength as well as the shear strength is inversely proportional to the percentage of filler material present...

... Upstream Oil & Gas correlation reentry time strength peak load resistance panel test accelerator type test result metals & mining cylinder pullout test shotcrete Reservoir Characterization shear strength requirement dosage compressive strength resistance load resistance...

... Upstream Oil & Gas variation MPa reservoir geomechanics strength specimen compressive strength flow in porous media failure characteristic water retention characteristic clay shale tensile strength mpa total suction shear strength stiffness Reservoir Characterization Fluid...

... and numerical modelling due to increased number of variable parameters. Due to unavailability of reliable and realistic results or models and the difficulties in laboratory testing of representative samples, engineers generally rely on judgment, often considering the shear strength of the infill itself as shear...

... having larger roughness amplitude. The increase of shear strength with Rmax probably is due to a peculiar mechanism initially not considered: more intense tangential forces must concentrate on taller and stronger asperities of joint walls than over less conspicuous asperities. Leal-Gomes (2000) discusses...

..., Barton & Bandis 1980) developed a procedure to estimate the shear strength of these joints start- ing from the basic friction angle of a planar rock joint b, a roughness index JRC, the strength of rock in the joint JCS and the normal stress to which the joint is submitted according to the well-known...

...Keynote lectures Rock Engineering and Rock Mechanics: Structures in and on Rock Masses Alejano, Perucho, Olalla & Jiménez (Eds) © 2014 Taylor & Francis Group, London, 978-1-138-00149-7 Shear strength of rock, rock joints and rock masses Problems and some solutions N.R. Barton Nick Barton...

... and block orientations. A straight forward evaluation method is presented and the results are discussed in detail, highlighting the effect of block orientation and block proportion on the shear behavior, shear strength and deformation behavior of bimrocks. 1 INTRODUCTION Tectonic faults are usually composed...