... ABSTRACT: This study combines novel and previously published data to create a new method of estimating anisotropic rock-mass strength in three dimensions that considers both the orientation and the non-persistence of multiple joint sets. Equations are developed to evaluate joint persistence...

.... They presented that the behavior of coal varied with respect to the angle between the geologic structure (such as cleats) and the loading direction (major principal stress). Kim et al. [4] modified the approach proposed by Kim et al. [5] and Kim and Kaiser [6] to understand how joint persistence affects...

...-automated approach machine learning persistence parameterization Island plane assessment rockfall hazard assessment photogrammetry point cloud investigation wall strength discontinuity acquisition 1. INTRODUCTION Rockfalls present a substantial increase in their spatial and temporal...

... characterization geostatistical approach DFN model fracture intensity bsd curve borehole block size persistence block model sandstone fluid modeling equation of state random distribution orientation tunnel mapping data excavation face validation block size distribution 1. INTRODUCTION...

... coal bed methane coal seam gas Modeling & Simulation complex reservoir metals & mining coalbed methane US government engineering property orientation different joint persistence characteristic laboratory test strength discontinuity investigation persistence compressive...

... containing three families of discontinuities, the intact rock showing degrees of alteration of its minerals. Scenarios for analyses are evaluated in conditions of very persistent and moderately persistent discontinuities with the purpose of observing their influence on the stability of the tunnel. Three...

... failure on intersecting discontinuities, toppling on inward dipping discontinuities, or complex failure modes involving all of these processes [1-3]. The main elements of the kinematic analysis are, therefore, the rock fabric characteristics (joint orientation and persistence and shear strength...

... intensity golder associate rock mass Groundwater Flow complex reservoir orientation discontinuity infrared thermography characterization fracture hydraulic fracturing persistence rock slope open pit photogrammetry intensity window mapping approach University 1. INTRODUCTION Groundwater...

... that their persistence and orientation could be assessed. In this study, Cumulative Fracture Frequency (CFF) was plotted for the geotechnical drill holes to assist in potential fault identification. Any substantial increase in the cumulative fracture frequency was considered as a potential major fault which later...

... to the pit slope; Set 2 Foliation parallel minor joints (persistence less than 5m) and major joints (persistence of 5- 50m) dipping into the slope at approximately 70°; Set 3 Shallow to moderately dipping major joints/faults striking sub-parallel to the slope and dipping pitwards; and Set 4 Sub...

...1. INTRODUCTION The development of open pit mines approaching depths of 1 km or more has brought renewed attention to the uncertainty inherent in estimating the persistence of adverse structures and the influence of intact rock bridges on their shear strength. As part of an ongoing project at Simon...

... orientation, spacing, persistence, surface roughness as well rock block and rock bridge patterns. Detailed measurement of terrain geometry, such as slope angle and height, over- and underbreak of underground excavations, as well as slope instability and surface erosion features. Enumerated below are details...

... - 45 25 - 35 15 - 25 < 15 E. GUIDELINES FOR CLASSIFICATION OF DISCONTINUITY conditions Discontinuity length (persistence) < 1 m 1 - 3 m 3 - 10 m 10 - 20 m > 30 m Rating 6 4 2 1 0 Separation (aperture) None < 0.1 mm 0.1 - 10 mm 1 - 5 m < 5 mm Rating 6 5 4 1 0 Roughness Very rough Roug h Slight ly rough...

... such slope near Newhalem, Washington, from which initiated the 2003 Afternoon Creek rockslide. This paper reports on the methodology and analysis techniques used to collect the 3-D point clouds, and extract the orientation, spacing, and persistence of important discontinuity sets. It includes a discussion...

... of an equivalent strength associated with early formation of collapse mechanisms during testing. Systematic numerical experimentation and testing of cubes containing a joint with varying persistences using an elastic-plastic model (Drucker-Prager yield, associated flow rules) showed progressive failure in tests...

... persistence is insensitive to variations of the stress field and of the joint orientation relative to the stress field. Apparent persistence depends strongly however on the distribution parameters of joint spacing and length together with cohesion of intact rock. 1. INTRODUCTION Probabilistic approaches...

..., a model was developed for inferring joint set parameters and for estimating the intensity of jointing (joint surface area per volume) from outcrop data. Intensity of jointing is an indicator of persistence. 1. INTRODUCTION Accuracy in predicting rock mass behavior de- pends on adequate characterization...