Discrete properties of entities of a geomedium and their canonical representation

Oparin, V. N.; Tanaino, A. S.; Yushkin, V. F.

doi:10.1007/s10913-007-0024-4

Cited by 16 publications

(3 citation statements)

References 15 publications

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“…Microstructures separated or surrounded by weak components that can be cementing materials or joints can be jammed to an annular structure under the action of forces due to a self-organization process. For a nonequilibrium system, the self-organization processes are universal, and occurred at each hierarchical level [12][13]. Once the stresses within microstructures reach certain conditions, splitting and/or shear failures can appear.…”

Section: A Unified Mechanism Of Slabbing and Zonal Disintegrationmentioning

confidence: 99%

“…Thin slabs form by shearing, splitting, and bucking, whose thickness varies from 1 to 5 cm [6][7]. A zonal periodic structure, i.e., an alternation of failed (or fractured) and elastic (or intact) regions, is found in the tunnel surrounding rock at great depth [8][9][10][11][12][13][14]. This phenomenon is confirmed in situ through geophysical techniques or a periscope by many researchers, called the zonal disintegration, and some analytical and numerical analyses have been carried out [10,[15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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A continuum grain-interface-matrix model for slabbing and zonal disintegration of the circular tunnel surrounding rock

Wang

Pan

2013

J Min Sci

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It is difficult to numerically reproduce the common failure modes of the circular tunnel surrounding rocks, such as the slabbing or delamination in hard rock, and the zonal disintegration at great depth, based on continuum and homogeneous elastoplastic models. In the present paper, a grain-interfacematrix model is proposed based on continuum elastoplastic theories, and implemented in FLAC. Rock is simplified as a compound of the circular grains, rectangular interfaces, and remaining matrix. These components are modeled by squared elements with the same size. Results show that shear strains exhibit intersecting and multiple shear bands or slip lines extending intergranularly. High principal stresses in compression are found to form rings around the tunnel surface. For fine grains, the intensive rings are found, similar to the slabbing; while for coarse grains, the spacing between rings becomes large, analogous to the zonal disintegration. Thus, a unified mechanism of two kinds of phenomena is explained as the selforganization process of dominant microstructures subjected to forces. Nevertheless, the scale of dominant microstructures regarding or governing the process is different. For hard rock without joints, the scale corresponds to actual grains; while for jointed rock mass under high compressive stresses at great depth, the scale of rock blocks is dominant.

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Section: A Unified Mechanism Of Slabbing and Zonal Disintegrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A continuum grain-interface-matrix model for slabbing and zonal disintegration of the circular tunnel surrounding rock

Wang

Pan

2013

J Min Sci

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“…There are few experimental confirmations of such waves, and the data on their velocities differ appreciably. Physically, the concept of strain waves rests upon the fundamental property of a geomedium-its bedding and blocky structure [3,[21][22][23]. The experimentally observed "slow motions" have a velocity 1-10 km/yr, which approaches the above determined velocities of the localized deformation waves of ~10 -5 -10 -4 m/s in sandstone and marble.…”

mentioning

confidence: 99%

Localization of deformation and prognostibility of rock failure

et al. 2014

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The general regular patterns in localization of deformation at pre-failure stage in rocks under compression are found and analyzed (sylvinite, marble sandstone). Applicability of speckle-photography methods to problems on rock deformation and failure is proved. The authors define the self-sustained behavior of the localized plastic deformation in rocks under compression, due to effect of various plastic micromechanisms. The autowaves in rock specimens under compression propagate at a rate of ~ 10 -5 -10 -4 m/s (0.3-3 km/yr), which is close to slow motions induced in the earth crust by an earthquake or a rockburst. The ratio of the experimental and calculated failure times is correlated with the coordinates of the failure points in the test rock specimens.

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