Results 251 to 260 of about 4,297,894 (335)

Layer-by-layer cutting of rocks

Journal of Mining Science, 2006
To describe the process of cutting of geomaterials by a two-sided wedge, a rigid-plastic model is considered taking into account the influence the wedge speed has on the cutting force, shear plane orientation, and sizes of sheared pieces.
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Tension Tests on Layered Rocks

Geological Society of America Bulletin, 1969
Tension tests were performed on four layered rocks: a shale, a gneiss, and two sandstones. Cores 2.125 by 4.25 inches were prepared, with the layers dipping at 0°, 15°, 30°, 45°, 60°, 75°, and 90° to the short cylinder axis. All tests were carried to failure, and strain was measured by gauges mounted on the cores. Rupture strength in tension is highly
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Stresses in rock outside buckled layers

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1979
Abstract The author presents a theory of folding stresses in rocks, based on assumption of elastic equilibrium or slow viscous flow and a known fold geometry. The theory was first formulated in 1960–1961 and applied in practical problems. At this stage the general form of the solution is derived, applicable to arbitrary fold configurations.
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Differentiated layering in metamorphic rocks

Earth-Science Reviews, 1990
Abstract Metamorphic or differentiated layering is best developed in low prograde metamorphic rocks such as slates and metaturbidites and is most easily recognised where it cuts a demonstrably earlier layering such as bedding. It commonly occurs as an axial plane foliation and typically comprises layers rich in phyllosilicates and opaque minerals ...
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Throughgoing fractures in layered carbonate rocks

Geological Society of America Bulletin, 2007
Fracture surveys were conducted across a broad anticline in southern Israel in order to investigate the development and geometries of throughgoing fractures in layered carbonate rocks. At Halukim anticline, throughgoing fractures form by the linkage and coalescence of preexisting, bed-confined joints. Thus the internal morphology of these structures is
M. R. Gross, Y. Eyal
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A failure condition for layered rock

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1988
Abstract The present paper covers a failure criterion for heterogeneous layered media, based on the assumption that each of their components follows a Mohr-Coulomb type strength condition. The “homogenization technique” employed enables the formulation of a failure condition defined by four strength parameters; the procedure for the identification of
TALIERCIO, ALBERTO, SACCHI LANDRIANI, GIANNANTONIO   +1 more
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DFIT Analysis and Interpretation in Layered Rocks

SPE Hydraulic Fracturing Technology Conference and Exhibition, 2020
Abstract Diagnostic fracture injection tests (DFITs) are often used to estimate formation properties such as closure stress, pore pressure, and matrix permeability. These estimations are typically based on analysis of pressure data assuming the closure of simple planar fractures in homogeneous reservoirs.
Shuang Zheng, Ripudaman Manchanda, HanYi Wang, Mukul Sharma   +3 more
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Permeability anisotropy of layering rock model

AIP Conference Proceedings, 2015
Computer models of layering system were generated to analyze the effect of layering to the permeability anisotropy. Six layering models were created using non-spherical grain models. Each model consist of three layers with different thickness ratios. The permeability of the generated models were calculated using Lattice Boltzmann Method.
Zaroh Irayani, Umar Fauzi, Fourier Dzar Eljabbar Latief   +2 more
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Patterns to ores in layered rocks

Economic Geology, 1960
Distribution patterns of syngenetic ore bodies in layered rocks correspond in area, symmetry, and metal variation with the rock facies structures. Distribution patterns of epigenetic ore bodies either correspond to antecedent and contemporary tectonic structures or deviate systematically under their influence.
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Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions

Cold Regions Science and Technology, 2004
Instability and failures of railway/roadway embankment are mainly caused by thaw settlement of permafrost in cold regions. To protect foundation soils beneath the embankment from thaw settlement is the primary construction principle. In the present study, the heat transfer characteristics of two cases of porous media were examined experimentally, with ...
Wenbing Yu, Yuanming Lai, Xuefu Zhang, Shujuan Zhang, Jiangzhang Xiao   +4 more
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