... in petroleum fields around the world, would ease UCS estimation, optimize drilling plans and decrease costs. 1. Introduction A geomechanical model requires a great deal of input information including measurements of magnitude of vertical and minimum stresses, pore pressure, rock mechanics properties...

... Abstract The paper presents the use of advanced stochastic simulation techniques for estimating the strength behavior of rock materials. The Shore Rebound hardness was measured on fifty rock specimens coming from eleven different geological localities in Czech Republic. The dry unit weight...

... 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...

... Abstract Existing rock mass classification systems, such as rock mass rating (RMR) are often used in many empirical design practices in rock engineering contrasting with their original application, i.e. estimation of TBM performance in various ground conditions. However, the use of RMR...

.... Total world reserves are estimated in 100 billion tons of K2O. First underground potash mining was started at a small mine near Stassfurt, Germany, in 1861. From that time rapid development of potash industry began, first in Germany and then in the former USSR, France, the USA, Canada, Italy and England...

... surface quality, infill presence and type play essential role in permeability of the rock mass in addition to rock material itself. Geological Strength Index ( GSI ) is a parameter used in Gen. Hoek-Brown failure criterion and supporting empirical equations in order to estimate rock mass strength...

... Abstract In the present paper, an up-scaling thermo-mechanical approach is presented for rock masses considered as anisotropic composite materials. A mathematical framework is proposed to estimate overall thermo-mechanical properties based on local geometrical considerations using the Mori...

... of rocks under confining pressure condition. However, the ordinary fracture toughness tests do not consider the effect of confining pressure in their estimation equations. A modified estimation equation for the mode I fracture toughness of rock under confining pressure condition was suggested in this study...

... of exposed intersection points and finally statistical distributions of the obtained results. Kernel Densities Estimation (KDE) was used as a tool for the statistical analysis. This analysis carried out as the contouring intersection points by selecting critical intersection lines according to friction angle...

... and economically. Thus, controlling this phenomena plays a key role in mineral extraction process. The first step is to calculate and forecast maximum subsidence in different areas, also to estimate subsidence angle. Chahargonbad copper mine is among the fewest mines in Iran which intended to extract by sub-level...

... on the adjacent structures are proposed. The authors also attempted to infer in-situ stresses using the damage of blasted-holes. The authors utilized the fault striation method (Aydan 2000) and blasted hole damage method (BHMD) (Aydan 2013). Aydan (2013) proposed a method to estimate the stress state from...

... ABSTRACT: With widespread applications of mechanized tunneling in almost all ground conditions, prediction of anticipated performance and production rate of tunnel boring machine (TBM) is essential part of planning, cost estimation, and selection of proper machine specification to achieve...

... propagation estimation reflective signal system device propagation laboratory test fundamental principle head side higher frequency wave propagation Mortar Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138...

... of conventional deterministic approaches. In this paper, a recently presented quantitative approach was combined with the probabilistic approach to determine GSI value and predict rock mass strength and deformability parameters. Using the estimated GSI and measured intact rock properties the probability density...

... with the best fit relationship is reviewed. Secondly, an artificial neural network (ANN) is developed using actual data sets, and showed higher accuracy. The resulted network can be used to estimate UCS of the roof rock in coal extracting areas in the mentioned zone by performing simple in-situ Schmidt hammer...

... roughness scale, and data accuracy influences roughness amplitude. Sturzenegger & Stead (2009) extracted first-order roughness from TLS data, however the question remains whether reliable estimation of second-order roughness is also possible. Therefore, the objective of this research is to define...

... Abstract Determination of Unconfined Compressive Strength of rock is important in Geotechnical Engineering. Although laboratory test is the most direct way of rock compressive strength estimation, but UCS determination in laboratory is problematic if the rock masses are weathered because...

... Abstract In the paper, we focus on analysis of conventional mechanical characteristics of rock mass. Our approach for estimation of scale factors is based on: the concept of fractal analysis; the principle of invariance of relative (to block size) distance between joints for each level...

... be smaller than the In-Situ Block Size. In practice, the IBS is estimated based on mean discontinuity orientation and spacing values derived from scanlines recorded manually. Instead, we propose a novel approach: the voxel method. The voxel approach uses all discontinuities visible in the rock face...

... (FORM) and Monte Carlo simulations, which both are described in most textbooks on structural reliability. 2.2 General procedure The general procedure suggested in this paper begins with making a first, crude estimation of the possible range and distribution of a relevant parameter for the analysed...