... (Figure 6). The typical fallout height is b 1 m. The stope is supported by yield- ing elongate support units, which allow a maximum deformation, dm, before failure of these units occurs. Except for the blocks of rock in the immediate hanging wall, the rock mass is assumed to be elastic in nature...

... deformation rotation chlorite schist stability metals & mining planar rupture crenulation cleavage importance rupture mechanism Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Importance...

... pressures and the damage and deformation of the coal ribs. 1 Introduction The two-entry longwall panel system is frequently used in underground coal mines in China, especially for highly gassy coal seams, where sufficient fresh air has to sent to the longwall face through the entries to meet the minimum...

... displacement deformation earthquake continuum coupling engineering dda stability interaction landslide matrix permeability case 2 case 3 evaluation Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4...

... was done in terms of deformations recorded during seventeen years of dam operation by multiple rod extensometers. Dona Francisca HPP dam was built in 2000, on the Jacuí River, in the central region of the Rio Grande do Sul State, Brazil. The geological and geotechnical conditions of the foundation...

... geomechanics thickness variation underground space technology finite element method figure 1 reservoir characterization deformation edz thickness finite element analysis table 1 influence overburden thickness Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca...

... upstream oil & gas displacement envelope halite limestone modeling elongation reservoir geomechanics shaft mudstone convergence strength envelope ccm dowel flac3d reservoir characterization deformation construction strength deep shaft mesh stiffness differential...

... role in improving the understanding of the mechanics and physics of deformation and failure on geomaterial specimens. This paper will provide a review of the applications of the in-situ CT scanning technique in the geomechanical tests. The review starts with the fundamental of the CT scanning technique...

...Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Managing the deformation of ground support and reinforcement E. Jones Beck Engineering, Sydney, Australia E. Hancock Newcrest Mining Limited, Orange...

... criterion is proposed for relating observed in-situ deformations to the decay within the rock mass and the extension of damage. An estimated damage curve may be induced as a function of the total strain at surface for compressive stress and buckling in tensile failure. The formulation is consistent...

... University of Technology, Pyongyang, Democratic People s Republic of Korea Kun Ui Hong Faculty of Mining Engineering, Kim Chaek University of Technology, Pyongyang, Democratic People s Republic of Korea ABSTRACT: Time-dependent deformations of rock are important factors for the desizgn and construction...

... and geological measuring equipment/surveys are set up during and after the construction to study the deformations of the rock mass and of the flexible support, and to complete the characterization of the excavation-induced fractures around this intersection. 1 INTRODUCTION As part of the French deep geological...

..., there are the tertiary and quarternary sedimentary coverages. 1.3 Support and reinforcement damage The damage to the applied support and reinforcement was associated with the high deformable ground condition caused by the stress increase due to the deepening of the mine and proximity of the stopes and because of some...

... and upstream sidewall reduce in result of rib-spalling, and the stress migrate to downstream sidewalls and bottom board in result of rock fracture. When the next floors excavated, rock failure features side-wall effect that mainly consists of unloading leading to rebound deformation. 1 Introduction Over...

... rock pressure in a deep tunnel is deformation pressure, while the surrounding rock pressure in a shallow tunnel is loosening pressure. 1 General Instructions There Is Initial Stress State In Rock Mass Before Tunnel Excavation. Within 500 M Of Crustal Depth, The Stress Of Surrounding Rock Increases...

... Abstract Fiber reinforced shotcrete has been used as primary surface rock support, providing the necessary post-crack performance and strain capacity. Both polypropylene and steel fibers have been added on the mix composition in order to achieve the necessary deformation capacity of the fiber...

... of excavations developed oriented North-South, parallel to the bedding planes and foliation, were prone to significant deformation. Several changes were implemented at CSA that resulted in managing of deformation in the strike drives on all the lower levels. The changes that were introduced to manage large...

... deformation tilt mechanics kovalenko accumulation Abstract The paper presents the experimental study of the damage evolution under triaxial non-proportional loading of sandstones using the Triaxial Independent Loading Test System (TILTS) with in situ continuous registration of acoustic emission...

... that the compressive stress is formed by initial confining pressures, and it effectively prevents radial cracks growing, reduces the damage accumulation speed and increases the ability of rock against blast loading. Under the repeated blasting, the elastic deformation appear and the initial microcracks do not have...

... Abstract In order to optimize the rock support design under the dynamic loading conditions such as rock bursts or coal bumps, weight-dropping tests were carried out to two samples of the constant-resistance-large-deformation (CRLD) bolts. Analytical models including the critical impact height...