Laboratory modeling of displacements of rock blocks: Low-amplitude fast movements in experiments on a slider model of fault

Kaznacheev, P.A.; Maibuk, Z.Y.; Ponomarev, A.V.; Patonin, A.V.; Sobolev, G.A.; Krayushkin, D.V.; Kokh, V.V.

Авторы: Kaznacheev Pavel A., Maibuk Zinovii-Yurii Ya, Ponomarev Alexander V., Patonin Andrei V., Sobolev Gennadii A., Krayushkin Denis V., Kokh Viktor V.
Журнал: Вестник Санкт-Петербургского университета. Науки о Земле
Том: 69
Номер: 2
Год издания: 2024
Издательство: Федеральное государственное бюджетное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет"
Местоположение издательства: Санкт-Петербург
DOI: 10.21638/spbu07.2024.201
Аннотация: Experimental modeling of physical processes associated with faults of the Earth's crust is important for studying earthquakes, rock burstand processes accompanying the deposit development. Laboratory experiments with the study of stick-slipsliding of rock blocks relative to each other on a fault slider model have become widespread. Stick-slip slidingmanifests itself in the form of episodes of rapid displacement when load increases to a critical value. The paper investigated the reaction of the model under conditions of different fault humidityafter increasing load to a subcritical value. After five days of fault wetting and three series of loads, small and fast displacements (microstick-slips) were detected by signals of a three-component high-frequency accelerometer. Microstick-slipsare two orders of magnitude smaller than displacements during episodes of the traditionally observed stick-slip. After time has elapsed since the loading stopped,intervals between microstick-slipsincrease faster than according to the power law. Magnitude of displacement, amplitude of accelerations and pulses of acoustic emission gradually decreases with reaching the plateau.Possible qualitative mechanisms of the occurrence of microstick-slipsare proposed, taking into account the gradual wettingand drying of the fault zone after water injection. The main hypothesis is competition of hardening and softening processes in the fault zone during the removal of water from the fault due to drying and action of capillary forces. Uneven propagation of these processes along the fault can create prerequisites for either small linear displacement on a limited section of the fault, or small displacement with rotation. These displacements manifest themselves as microstick-slips. General slow slippage along the fault and decrease in shear stress leads to decrease in frequency of microstick-slipsand in their characteristic parameters.
Добавил в систему: Краюшкин Денис Владиславович

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Laboratory modeling of displacements of rock blocks: Low-amplitude fast movements in experiments on a slider model of faultстатья

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