Pendulum-type waves. Part II: Experimental methods and main results of physical modeling

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

doi:10.1007/bf02046215

Cited by 50 publications

(25 citation statements)

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“…This conclusion follows from [1] and a comparison of the main carrier harmonics in the high-(285.2 Hz) and low-frequency (13.7 Hz) regions of the spectrum of the diagrams of transverse displacements of the silicate blocks with the base frequency f0 = V~/(2A). The effect shown in tile present paper is of primary importance for studying of the mechanism of earthquakes, rock impacts, and other dynamic forms of manifestation of rock pressure; it can be widely used in technical applications to solve problems connected with weakening of the friction between interacting bodies.…”

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confidence: 87%

“…In studying the mechanism of emergence of pendulum-type waves (/z-waves), the authors [1] revealed the effect of friction "disappearance" between the interacting blocks from geomaterials at definite energy levels of the pulse effect on the models of block media. The disappearance of friction is observed in the directions orthogonal to the line of action of the external pulse.…”

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confidence: 99%

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Effect of anomalously low friction in block media

Kurlenya¹,

Oparin²,

Vostrikov³

1999

J Appl Mech Tech Phys

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1. In studying the mechanism of emergence of pendulum-type waves (/z-waves), the authors [1] revealed the effect of friction "disappearance" between the interacting blocks from geomaterials at definite energy levels of the pulse effect on the models of block media. The disappearance of friction is observed in the directions orthogonal to the line of action of the external pulse. In this connection, several problems concerning the mechanical conditions and manifestation of the effect of anomalously low friction in block media arise.Here we confine our analysis to the following problems:(1) Finding the link between the transverse displacements of blocks from geomaterials in two-sided hindered conditions when the vertical pulse acts on the block system and the horizontal pulse (or the force) acts on the working block;(2) the effect of the time interval of delay between the horizontal and vertical pulse effects on the character of transverse displacements of the working blocks.2. To solve the above problems, a number of experiments were performed by the method of physical modeling. The experiments were carried out on two models. (Fig. 1). In this scheme, a node 12 is the node of specification of the static horizontal action. A platform 8 with a dynamometer 9 is fastened rigidly to block IV by means of screws 11. In block III, there is a screw which is connected to the dynamometer by a regulator of action 10. This regulator creates the necessary horizontal action for block III relative to blocks II and IV. Together with block III, a stop 7 on the platform serves to prevent motion of block II. At the point A of block I, at the center a hardened screw, which is the "point" of vertical pulse excitation, is placed. The role of the vertical pulse action is played by a hardened hammer head 2 of weight 82.71 g. To specify different levels of energy action on the block system, the hammer head was dropped from different heights relative to the point A of block I. The fraction of the kinetic energy transmitted from the Mining Institute, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090.

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confidence: 87%

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confidence: 99%

Effect of anomalously low friction in block media

Kurlenya¹,

Oparin²,

Vostrikov³

1999

J Appl Mech Tech Phys

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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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“…M. A. Sadovskii [16] offered a new viewpoint, which makes the dynamic study of the rock mass based the discontinuous and self-stress block rock mass structure. Today the researches show that the pendulum-type propagation of waves in the discontinuous and selfstressed block rock mass structure is closely connected with the rock mass dynamic response in deep [10,[12][13][14]. In the last years, the theoretical and experimental investigations of pendulum-type waves achieved some progress [1-6, 8, 15, 17].…”

Section: Introductionmentioning

confidence: 99%

Steady-State Response of the Block Rock Mass to External Periodic Excitation and Resonance Condition

2014

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The theory of deep rock mass is proposed as the complex hierarchy of block structures on the basis of the discontinuous and self-stressed rock mass structure in depth. We study the block structure of the rock mass steady-state response to the external periodic excitation. We get the resonance equation and the resonance condition for the block rock mass structure under external periodic excitations. The effects of the local mass and stress state between the adjacent rock blocks in block rock mass structure on the steady-state displacement of rock blocks are analyzed.

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Pendulum-type waves. Part II: Experimental methods and main results of physical modeling

Cited by 50 publications

References 1 publication

Effect of anomalously low friction in block media

Effect of anomalously low friction in block media

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

Steady-State Response of the Block Rock Mass to External Periodic Excitation and Resonance Condition

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