.... Numerical simulation has been carried out by Phase2 two-dimensional FEM analysis and this research mainly considered studying the influences of different geological conditions of coal measure; coal seam thickness and dip angle. Keywords: The crown pillar stability; End-wall slope; The transition area from...

... of higher stress concentrations such as abutment stresses from multiple seam mining or anomalous geologic conditions, and (4) roof beam thickness, joint spacing, and stiffness characteristics, which influence cave conditions and dynamic loading. The latter variables, combined together to form a new variable...

..., and the peak shear strength of the specimen is determined by the weaker joint. In contrast, under higher normal stress, the peak shear strength is attained when the tensile fractures initiate in the interlayer rock, and it has also relevancy to the JRC of double joints and interlayer thickness. Additionally...

... shield construction materials water conveyance tunnel steel bar isrm international symposium sabzkouh water conveyance tunnel water pressure rock mass concrete lining tunnel asian rock mechanics symposium 29 tunnel lining Thickness kazhdomi formation lining Evaluation of Induced Forces...

... with a thickness of 3, 5 and 7 mm. Finally, full-scale loading tests were carried out to evaluate a structural reinforcement of shield segments. From the test, it was confirmed that the structural loading capacity of the shield segment could be improved by a coating of the sprayed waterproofing membrane. 1...

... should be used in burst-prone rock masses. Upstream Oil & Gas isrm international symposium plastic zone Reservoir Characterization strength rock bolt length bolt length reservoir geomechanics Thickness asian rock mechanics symposium 29 support system deformation arunachal pradesh...

... are quite greater than what is predicted by the theory of elasticity for a beam of equal thickness sagging under its own weight, but there is no roof failure in the sense of caving. This phenomenon can be explained by the formation of a purely compressive arch within the roof beam that sustains the entire...

..., the numerical models were first calibrated by the laboratory results with different concrete panel thickness without using welded wire mesh. After that, the performance of the combined concrete layer and welded wire mesh was examined by using the calibrated concrete model and mesh model and the failure...

... that the requirements are both technically relevant, achievable and measurable. Therefore, the hydrogeological descriptions must closely link to possible technical solutions for project specific requirements and to the monitoring set up. structural geology Thickness isrm international symposium requirement...

... of test results shows that TSLs, in spite of their significantly smaller application thickness, match and in most cases exceed the tensile strength of shotcrete. It is hoped that the comparison made in this paper would provide additional encouragement for the mines to initiate the application of TSLs...

... when reaching the envelope and others follow it for a while. There is no general rule for when and where on the envelope grouting should be stopped. A parameterization of the penetrability on the envelope is provided in this paper. For the parameterization, the grout rheology, the fracture's thickness...

... tunnel, and the results of in-site measurements. Artificial Intelligence wave velocity nakaya Upstream Oil & Gas seismic exploration october 2014 asian rock mechanics symposium arms8 Yamamoto seismic velocity EDZ excavation rock mass Reservoir Characterization Thickness Sasaki...

... joints are filled with clay material of varying thicknesses. Modifications adopted tothe resonant column apparatus for testingstiffmaterials are explained in this paper. Shear and compression wave velocities were obtained for three different confining pressures.Damping ratios and attenuation coefficients...

... of cylinders was an important inspiration for invention of the Brazilian indiret tensile strength test (Gerçek and Özarslan, 2010). Carneiro has developed the testing method. He presented this method in 1943, fistly. He suggested to use concrete disks that have 15 cm diameter and 30 cm thickness. Loading...

... methane Upstream Oil & Gas Thickness boundary stratum ABSTRACT The plastic characteristics of the coal seam floor has been explored in this article on FEM stength reduction with the software of ANSYS, and the plastic area perforation process has been given. The slip scope given on FEM...

... resistance jenike assumption Thickness Mohr adhesive rough wall rough wall Upstream Oil & Gas arch bulk material passive condition reservoir simulation vertical channel cohesive bulk material adhesionless rough wall moist sand bedding plane principal stress shear stress...

... effective in weak formations. Reservoir Characterization displacement shotcrete plastic zone empirical method diameter lining rock mass classification penstock tunnel rock bolt permanent support system support system tunnel classification Thickness lattice girder rock mass rudbar...

... to decrease advancing time. Polymer spraying application is practical and there is no rebound problem in sprayed-polymer application. Candidate polymer types were compared within. reservoir geomechanics Thickness steel impact strength polymer fiber elasticity modulus polymer material application...

... SYNOPSIS: Most of the coalfields of India consists multi-seam mining conditions, where a majority of the coal seams have 9m or less inter-burden parting thickness called contiguous seams. Many of these contiguous seams have weak and laminated parting. Underground extraction of contiguous seams...

... Abstract: A new sampling method using thick water-soluble polymer was developed to obtain high quality drillcores from more difficult grounds like fractured zones or heavily weathered rocks. Yanagisawa et al. (2004) suggested some mechanisms for this sampling technique like Weissenberg effect...