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Keywords: roof failureClose
Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-956
... ABSTRACT: Roof failures in the longwall headgates mostly occur outby the T-junction area within the front abutment pressure zone. The roof in this area could fail in the form of cutters, sagging, or collapse. Although front abutment pressure, high horizontal stress, and adverse roof geology...
Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-137
... conditions in a mine roof appear to limit the potential for sudden catastrophic buckling of roof beds in the situations modeled. “Cutter” type roof failure near the excavation corners was more likely to occur in the models when the lamination interfaces were weaker and less stiff. A ground response curve...
Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-743
... as it is pushed away from the mid-Atlantic ridge. Elevated stresses are not necessarily present in all the limestone formations because local features such as outcropping and folding may have relieved the stresses over geological time . The tectonic stresses can cause roof failure by progressive shearing...
Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-1213
... Indian Creek Beds in the Ste. Genevieve limestone. A room with similar dimensions and stratigraphy but closer to the cave entrance and slope face exhibits extensive roof failure resulting in a high breakdown dome. This suggests that the roof of the Flat Room may be near the limit of stability. We have...
Paper presented at the 19th U.S. Symposium on Rock Mechanics (USRMS), May 1–3, 1978
Paper Number: ARMA-78-0586
.... This information is important in the prediction of roof failure and for rational entry design. This data can be gathered rapidly by attaching microcreep- meters to anchors located at varying depths in the roof. 3O 25. Method y Seams , Cloy Seem - Conventional Method I0 IO a STRAIN RATE (in./in./ Microcreepmeters...
Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0334
... safety factor of about 1.0, since the compressive strength of rock salt is generally assumed to be around 5,000 psi. extraction ratio convergence measurement roof failure entry 32 test panel dolomite safety factor pillar safety factor square pillar shale feet square pillar load mining...
Paper presented at the The 2nd U.S. Symposium on Rock Mechanics (USRMS), April 21–24, 1957
Paper Number: ARMA-57-0205
... instrument shaft roof control means roof condition Instrumentation Experiment installation deposit roof failure compression pad shuttle car INSTRUMENTATION EXPERIMENTS IN UNDERGROUND MINES BY T. S. BERNATIS *Mino Superintendent, Intermountain Chemical Company. CONTENTS Page Introduction 207...
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