Pendulum waves. Part III: Data of on-site observations

Kurlenya, M. V.; Oparin, V. N.; Vostrikov, V. I.; Arshavskii, V. V.; Mamadaliev, N.

doi:10.1007/bf02046155

Cited by 27 publications

(7 citation statements)

References 2 publications

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“…As is known, rock at great depth is characterized by the existence of rich joints so that prominent blocky characteristics are found [26][27][28][29], leading to the occurrence of some new phenomena, such as the pendulum-type reversal wave [34][35][36] al. suggested that for seriously and moderately jointed rock masses, the supporting measurements should be different [11].…”

Section: A Unified Mechanism Of Slabbing and Zonal Disintegrationmentioning

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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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%

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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“…Blocks of the same level are separated by interlayers of rocks with weakened mechanical properties. It was noted in [2,3] that the sizes of blocks change on a scale from fractions of a rock mass to geoblocks of the earth's crust. In the experimental work [4], it was shown on a two-dimensional model of a block medium (a brick wall), that for a real geomedium it is possible to determine the sizes of the characteristic blocks of the rock mass according to seismic logging data, using the relation discovered in [5] that relates the value of the propagation velocity of a low-frequency wave, the frequency limiting its spectrum, and the longitudinal size of the blocks.…”

Section: Introductionmentioning

confidence: 99%

Model of Block Media Taking Into Account Internal Friction

Aleksandrova

2022

Mech. Solids

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The block medium is modeled by a discrete-periodic spatial lattice of masses connected by elastic springs and viscous dampers. To describe the viscoelastic behavior of the interblock layers, a rheological model of internal friction with two Maxwell elements and one Voigt element with the quality factor of the material as the determining parameter is proposed. Numerical experiments show that, within the framework of this interlayer model, it is possible to select the viscosity and stiffness of the Maxwell and Voigt elements so that the quality factor of the material differs from the given constant value by no more than 5%. In the one-dimensional case, within the framework of the proposed model, the influence of the quality factor on the dispersion properties of a block medium is studied and it is shown that the greatest effect of the quality factor on the dispersion is observed in the low-frequency part of the spectrum. In the three-dimensional case, within the framework of the proposed model, some geomechanical problems are numerically studied for a block half-space under the action of a surface concentrated vertical load. Namely, the attenuation of the velocity amplitudes of surface blocks was studied depending on the Q-factor under step action and under the action of a Gaussian pulse. In addition, we study a layer on the surface of a halfspace under the action of a concentrated vertical impulse load in the case when both the layer and the halfspace are block media but have different properties.

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“…Furthermore, chains of bilinear oscillators possess a rich structure of main resonances also accompanied by multi-harmonic and sub-harmonic ones (Shufrin et al, 2012;Dyskin et al, 2014). This structure of resonances may give an explanation to the observed spectral peaks in oscillations of blocky media (Kurlenya et al, 1996a;Kurlenya et al, 1996b;Kurlenya et al, 1996c). The effect of bilinearity on wave propagation was analysed by Kuznetsova et 25 al.…”

Section: Introductionmentioning

confidence: 99%