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Experimental study of different modes of block sliding along interface. Part 2. Field experiments and phenomenological model of the phenomenon

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Abstract

The paper reports the results of field experiments on studying different modes of gravitational sliding of a block on the natural fault surface. Various materials were used as interface filler to model the whole range of deformation events that can be arbitrarily divided into three groups: accelerated creep, slow slip, and dynamic slip. The experiments show that the type of modeled deformation events is defined by both structural parameters of contact between blocks and material composition of the contact filler.

Foundations for a new geomechanical model of occurrence of different-type dynamic events were developed. The model is based on the idea that “contact spots” form subnormally to the crack edges during shear deformation; the “spots” are clusters of force mesostructures whose evolution governs the deformation mode. The spatial configuration of “contact spots” remains unchanged during the entire “loading-slip” cycle but changes after the dynamic event occurrence. The destroyed force mesostructures can be replaced by similar structures under intergranular interaction forces when the external influence is fully compensated. Unless “contact spots” are incompletely destroyed, the deformation process dynamics is defined by their rheology. The migration of “contact spots” during deformation of a crack filled with heterogeneous material causes changes in deformation parameters and transformation of the mode itself due to changing rheology of local contact areas between blocks.

It is found by fractal analysis that in order for dynamic slip to occur, spatially structured “contact spots” characterized by low fractal dimension must be formed; slow slip events can exist only in a certain parametric domain called the “dome of slow events”. It is found that the probability of slow slip occurrence is higher on fault regions characterized by maximum fractal dimension values: fault tips, fault branching and fault intersection zones.

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Authors and Affiliations

  1. Institute of Geosphere Dynamics, Russian Academy of Sciences, Moscow, 119334, Russia

    G. G. Kocharyan, A. A. Ostapchuk, D. V. Pavlov, I. V. Batukhtin, E. A. Vinogradov & V. K. Markov

  2. Moscow Institute of Physics and Technology (State University), Moscow, 117303, Russia

    G. G. Kocharyan, I. V. Batukhtin & A. M. Kamai

  3. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, 664033, Russia

    V. V. Ruzhich

Authors
  1. G. G. Kocharyan
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  2. A. A. Ostapchuk
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  3. D. V. Pavlov
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  4. V. V. Ruzhich
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  5. I. V. Batukhtin
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  6. E. A. Vinogradov
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  7. A. M. Kamai
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  8. V. K. Markov
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Correspondence to G. G. Kocharyan.

Additional information

Original Russian Text © G.G. Kocharyan, A.A. Ostapchuk, D.V. Pavlov, V.V. Ruzhich, I.V. Batukhtin, E.A. Vinogradov, A.M. Kamai, V.K. Markov, 2015, published in Fizicheskaya Mezomekhanika, 2015, Vol. 18, No. 6, pp. 75-85.

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Kocharyan, G.G., Ostapchuk, A.A., Pavlov, D.V. et al. Experimental study of different modes of block sliding along interface. Part 2. Field experiments and phenomenological model of the phenomenon. Phys Mesomech 20, 193–202 (2017). https://doi.org/10.1134/S1029959917020096

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  • DOI: https://doi.org/10.1134/S1029959917020096

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