... 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...

... for the rift, grain and hardway planes are around 6.1 MPa, 8.3 MPa and 8.8 MPa, respectively. Moreover, the failure plane of Pocheon granite in BTS tests were scanned by X-ray CT and roughness of the failure planes were evaluated. Analysis results show that roughness of failure plane is lower for the rift...

... of this paper is to clarify the relationship between the irregularity of the clump configuration and the failure behavior of the simulation model. Simulations of unconfined compressive tests and Brazilian tensile tests were carried out. The effect of the surface roughness of the clumps was examined by varying...

... ABSTRACT: Spring-block models are a useful tool for modeling avalanche-like dynamics for catastrophic landslides. This paper examines the statistical behavior of the failure of a rock (or soil) slope taking into account the effect of roughness, through the use of the real contact area...

... ABSTRACT: This paper reports about the influence of normal- and shear displacements on the permeability of artificially created rock joints with different surface roughness. A new experimental setup was designed to allow linear flow on a fracture of area 150 × 150mm and also for normal...

... surfaces of a fracture. Meanwhile, numerical models of dislocation of self-propped fractures are established under the conditions of smooth fractures and rough fractures. Based on the above research, the numerical analysis and experimental results show that self- propped width is proportional to the slip...

... 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...

... Abstract In this study, the possibility of measuring rock surface roughness by means of open-source photogrammetric methods was investigated. With simple commercially available digital cameras, samples of varying roughness were measured. As a reference, the samples were also measured...

... Abstract Some limitations of the models of limit equilibrium of forces for rock mass joints are discussed here, especially the exclusive use of dimensionless geometric parameters of roughness. A new limit equilibrium model of strain energies for rock joints, which allows the integration...

... Abstract Numerous measurement and characterization methods have been developed over the past decades to quantify the roughness of rock joints. The characterization methods traditionally consider a 2D linear trace and are often limited to the laboratory scale. In this research, 3D point clouds...

... conducted on discontinuities in shale and sandstones. These were partly weathered and sometimes coated by coal. Friction angles range from 10° for coal-coated joints in sandstone to 40° clean joints in sandstone. The discontinuities were scanned with a 3D laser scanner for estimating the surface roughness...

..., it is necessary to gain knowledge about the shear strength of these joints.The shear strength of rock joints is influ- enced by several factors such as the surface roughness, the compressive strength of the joint surface, the nor- mal stress, the degree of weathering, the matedness, the infilling material...

...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 CFD-DEM simulations for injection of cement-based grout the effect of rock fracture roughness S. Sakakibara & T. Koyama...

... and Mineral Resources Engineering, Norwegian University of Science and Technology, Trondheim, Norway ABSTRACT: The apparent friction angle of a rock joint, , is the sum of two parts: the basic friction angle, b, and the roughness angle, i. b is decided by the mineralogy of the rock; It is usually measured...

.... With linear Mohr-Coulomb this is not a very enlightening exercise. The very small circles in Figure 6 represent the peak strength of fractures, and the dotted curved envelope, drawn into the inadmissible area for reasons of clar- ity, was used to demonstrate the maximum empirical strength of (rough) rock...

... Abstract From a physical perspective, a joint experiences fracturing processes that affect the rock at both microscopic and macroscopic levels. The result is a behaviour that follows a fractal structure. In the first place, for saw-tooth roughness profiles, the use of the triadic Koch curve...

... as a quantity in literature. The boundary strength between an-desite fragments and tuff matrix is also sensitive to fragment shape and surface roughness of andesite fragments. Therefore fractal dimensions were selected as input parameters to incorporate this effect on boundary strength. While previously...

... between rock blocks is presented to evaluate the performance of breaking mechanism of such blocks relating it to the morphology of the contact and mechanical parameters of the material. The examined framework includes the evaluation of the surface roughness of first order in the failure mechanism...

... Abstract The paper provides new results on the fracture surface roughness testing from the Bátaapáti National Radioactive Waste Repository project. During the calibration of modeling and design work it was necessary to develop a simple and quantitative approach to predict the Joint Roughness...

... to be developed (Bidaut et al. 2006, Konietzky et al. 2012). The aim of this project is to bring the concept of in situ direct shear tests performed on dam sites into the laboratories by replicating the real surface roughness of a discontinuity. The paper describes the components, set-up and technical data...