... to the roof of the upper seam of the contiguous pillar workings. 2.2. RMR The Rock Mass Rating (RMR)[16] of the parting as well as immediate roof of each mine were hypothetically varied to get sufficient range. ARMA 13-198 Estimation of parting stability and support requirements during depillaring in two...

... lining to determine ground support requirements. 1. INTRODUCTION 1.1. Project Background The existing Caldecott Tunnel complex includes three bores along State Route 24 (SR 24) through the Berkeley Hills in Oakland, California. The California Department of Transportation (Caltrans) and the Contra Costa...

... design methodology was developed to determine support requirements for the tower excavation under seismic loading. The maximum design load on the rock bolts, when permitted to yield inelastically, is considerably less than the peak dynamic loads associated with the design earthquake. This design method...

... waste repository liner calculation requirement support requirement repository rock mass loading repository shaft Design Methodology deformation Key Questions in Rock Mechanics, Cundall et al. (eds) ¸ 1988 Balkema, Rotterdam. ISBN 90 6191 835 9 A concrete shaft liner design methodology...

... Modeling & Simulation average apex height unstable area key block orientation dimension Goodman excavation support requirement reservoir simulation poisson disc model mccullagh mean trace length joint disc joint density mean density trace length Block Theory rock excavation...

... rock quality mapping convergence rate grizzly convergence measurement grouted bolt support requirement 28th US Symposium on Rock Mechanics / Tucson/29 June- 1 July 1987 Ground stability and support in block caving operations at Molycorp's Questa Mine LETAgapito J. ET_4gapito & Associates, Inc...

... metals & mining deflection strong bed barrier end safety Thickness face end support requirement support reguirement equation face support span built-in end support resistance immediate roof longwall face strata goal edge cantilever Chapter 48 THE SUPPORT REGUIRE ENT...

... ABSTRACT ABSTRACT Chan and Goodman (1983) presented a procedure for simulating joint traces and identifying key blocks on an excavation. This paper defines six measures of support requirements that characterize the number and dimensions of key blocks, taking into account the frictional...

... the determination of critical blocks from a map of joint traces on the surface of an excavation. This paper discusses how to simulate and manipulate such a map to anticipate support requirements for an excavation through a rock m ss. The data to be input in the simulated rock volume are the fixed orientation...

..., also the influence of the roof caving charac- teristics on the loading parameters at the coal face. A method by which the required face advance for the first cave of the gob is given. Finally, criteria for the coal face support requirements are outlined. INTRODUCTION Traditionally the room and pillar...

... by the author. Permission to copy is restricted to an abstract of not more than 300 words. Write: Dr Ken Gray, U. of Texas at Austin, Petroleum Engineering Dept. ABSTRACT The methods utilized to arrive at permanent rock support requirements for a machine-bored tunnel con- structed as part of Chicago's TARP...

.... Both factors are weighed to minimise difficult rock conditions for the case of large span openings of limited length. However there is little opportunity to choose the orientation of tunnels, and generally only the location can be changed significantly. The amount of support required will be strongly...