... and economic constraints. Pillar design process involves estimating the pillar stress and the pillar strength and sizing the pillar until an acceptable margin of safety (ratio of pillar strength to pillar stress) is attained. metals & mining pillar strength empirical equation Reservoir...

... of reinforcement and/or repair, so the pillars must be and remain stable. Empirical methods provide an attractive rock pillars design option for geotechnical engineers. These provide an effective means of analyzing the geometry, strength, and pillar stresses, as well as the properties of the rock mass. This paper...

... oil & gas rock mechanics estimation pillar strength friction angle pillar case pillar height pillar stress pillar Numerical Estimation of the Strength of St. Peter Sandstone Pillars A Case Study at Iowa Arthur, F. A. and Ge, M. Department of Mining and Nuclear Engineering, Missouri...

... Upstream Oil & Gas History application probability confinement database pillar pillar design Artificial Intelligence strength logit probability value height ratio hard rock pillar design logistic regression stability pillar stress design method 1. INTRODUCION Room and pillar mining...

... & Gas pillar foundation failure laboratory MPa reservoir geomechanics cohesion solid block fundamental investigation pillar stress pillar field measurement excavation Roof Stability metals & mining strength structural damage abutment block plate bearing test borehole shear test...

... pillar stress ductile material bushveld platinum deposit South Africa hydrostatic test width-to-height ratio Upstream Oil & Gas pillar failure borehole internal friction angle brittleness residual strength MPa brittle material foundation pillar ARMA 08-72 In situ measurements...

...). reservoir geomechanics drilling fluid chemistry drilling fluid formulation extraction ratio pillar stress pillar time-dependent stability implication metals & mining drilling fluids and materials two-seam mining columnization creep global stability drilling fluid selection and formulation...

... with respect to longwall face advance, the stressmeters were used to determine the change in vertical stress. These data were then analyzed to gain a better understanding of the mechanics of vertical load redistribution in the gate road pillars. Stress profiles across the pillars show the stress changes...

... approximation to actual room-and-pillar mines in many cases including gently dipping seams, and thus allows one to estimate a pillar safety factor based on average pillar stress and strength. However, when the dip is arbitrary, the presence of shear forces complicates the situation. No formula comparable...

.... Pillars are three dimensional as are rooms defined by the entry and crosscut intersections. reservoir geomechanics plane pillar stress Reservoir Characterization metals & mining mesh local factor two-dimensional analysis algorithm element analysis pillar finite element analysis...

... that the pillar stresses are the result of a complex non-linear interaction of many variables, and the maximum pillar stress can reach several multiples of the tributory-area pillar stress. INTRODUCTION One of the most challenging problems associated with the nuclear power industry is the safe, cheap storage...

... and weaknesses of the coal mass. Reservoir Characterization classification chain pillar seam investigation metals & mining strength reservoir geomechanics Rock mechanics friction Coal Measure rock information sandstone Bieniawski pillar stress Upstream Oil & Gas coal cohesion...

... Reservoir Characterization pillar failure overcore Agapito creep rate oil shale strength operation pillar vertical pillar stress stress determination pillar stress vertical stress deformation horizontal stress long-term stability case study A Case Study of Long-Term Stability...

... plastic and/or viscoelastic deformation (creep). The creep rate depends on the average pillar stress (which in turn depends on the extraction ratio) and is usually limited to a value such that the pillar deformation and attendant effects will not interfere with mining operations. A number of researchers...

... of the opening and pillar stress on creep rates. Data from these stations tended to indicate that Serata's hypothesis of steadily decreasing vertical convergence was correct, at least for the pillar stress levels encountered in the Kansas mines. In March 1963 Serata indicated that he had successfully...