... Abstract Rock mass behavior is controlled mainly by weak planes in sedimentary rocks. Geomechanical model tests were conducted for simulating tunnel excavations in horizontal, the 45° and vertical inclined rock strata. Infrared thermography was employed for detecting rock responses during...

... provides least resistance path for the caving roof strata to encroach the working areas. Influence of strata caving, inside the goaf, make it difficult to apply conventional roof bolt support norms in these openings at the goaf edge. Basic rock mechanics considerations find that the mining induced stress...

... be used for displacement control in mining and underground construction. 1. Introduction When developing salt and potash deposits, the main objective of ensuring safe conditions for mining operations is to preserve the continuity of the water-blocking strata that separate overlying watered layers...

... of the detected fractures surfaces. It also identified a rock stratum with a noticeably lower load of critical fractures compared to the other strata. Physico-mechanical properties were investigated by laboratory tests allowing classification of the deposit into quality categories, which provided a promising...

... Abstract In this paper, the relationship between the dynamic surface subsidence and overburden separated strata has been studied under the condition of sedimentary coal measure strata. When the underground coal seam is mined, the ground surface subsidence will be caused. The surface subsidence...

... of strainsoftening material model within UDEC in order to represent the failure and caving induced by the mining process. Results of numerical simulation have improved the understanding on LTCC mechanisms in terms of stress redistribution, rupture mode and failure mechanism in coal and roof strata. These results...

... influence factors of floor heave. If the floor strata were dense thick mudstone, the rock burst will happen for the elastic deformation energy released in the process of floor layer broken. The essence of deep hole floor-break blasting was the combination of borehole pressure relief and blasting vibration...

... in the strata surrounding the longwall mines and then this information was input into a single-phase regional scale groundwater flow model. The coupled model is fully described in Adhikary & Wilkins (2012) and will not be discussed here. flow in porous media Piezometer Water Resource metals...

... not be as representative as the obtained in the other two formations. structural geology strength strain gauge Upstream Oil & Gas natural water content laboratory relation water content mean value FMAM deformability specific weight strata Reservoir Characterization longitudinal anisotropic rock...

... have been originally described by Cavers (1981) with reference of buckling strata. Also, when the rock matrix is weak, such failure is accompanied by the formation of "kink-bands" and therefore it has been recognized that discontinuities have only a partial role in the instability, the shear failure...

... Abstract Stress concentration and rockburst risk in coal mine are associated with the occurrence of competent strata in overburdened coal seams. Benches of sandstone and conglomerate are difficult unbreakable and a high level of elastic energy is stored there. It can be released as a rockburst...

... injection propagation hmin hydraulic fracturing aperture Upstream Oil & Gas natural fracture rock mass fracture displacement strong fabric strata Barnett shale Rock Mechanics for Resources, Energy and Environment Kwas´niewski & ydz ba (eds) © 2013 Taylor & Francis Group, London, ISBN...

... areas will be explained. On the basis of spatio-temporal relationships of real surface subsidence, mined longwalls, and geomechanical events, the character of overlying rock deformations can be evaluated. The character of rigid overlying strata will be evaluated by means of an inflexibility coefficient...

... in the local mines' seismic stations. These investigations permit recognizing stress-deformation processes which occur during a given tremor's occurrence. The largest risk for the mining operations are created by high-energy tremors which hypocenters are located within the main roof strata, about 40–200m...

... subsidence panel 24 thick coal seam virgin panel px eurock 2012 Panel PX strata coal seam Maximum Subsidence surface strain Numerical Modelling based Feasibility Study for Extraction of Bord and Pillar Panels under a Built-Up Area - A Case Study U. K. Singh Department of Mining Engineering...

... about the coal mining operations in the Germany which may be summarized as follows: The depth of mining today is below 1200 m. The in situ stresses at depth are in the order of 19 44 MPa. The rocks are very strong with a lower bound for UCS of 50 MPa. The strata are jointed, faulted and folded...

...Eurock 2005 -Impact of Human Activity on the Geological Environment - Konecny (ed) © 2005 Taylor& Francis Group, London, ISBN 04 1538 042 1 Real Time Instrumentation system for analysis of strata caving of an Indian longwall operations - a case study Srinivasulu Tadisetty & R.N. Gupta Department...

... platform strata The studies whose main results are reported in the present paper were carried out in November-December 2000 and in January 2001 at the request of Ponta do Oeste, S.A., aiming at the stabilization of the rocks that build up the cliff, in order to consider and propose the adequate...

... foliation dip angle rock mass local fracture foundation displacement gneiss foliation strata deformation mode lateral load Foundation Behaviour pier base limit load jointed rock slope fracture stiffness friction angle foliation Eurock '96, Barla (ed 1996 Balkema, Rotterdam...

... ABSTRACT: In the Far West Rand gold fields a series of lava flows cover sedimentary strata; an important deposit, known as the Ventersdorp Contact Reef (VCR), is found at the contact between the lavas and various sedimentary rock types. Until recently little research had been done...