gscienceMining Science and Technology (Russia)Горные науки и технологии2500-0632The National University of Science and Technology MISiIS (NUST MISIS)10.17073/2500-0632-2022-12-36gscience-468Research ArticleMINING ROCK PROPERTIES. ROCK MECHANICS AND GEOPHYSICSСВОЙСТВА ГОРНЫХ ПОРОД. ГЕОМЕХАНИКА И ГЕОФИЗИКАEffect of strain amplitude and confining pressure on the velocity and attenuation of P and S waves in dry and water-saturated sandstone: an experimental studyВлияние амплитуды деформации и всестороннего давления на скорость и затухание P- и S-волн в сухом и водонасыщенном песчанике: экспериментальное исследованиеhttps://orcid.org/0000-0001-8621-0719МашинскийЭ. И.MashinskiiE. I.

Эдуард Иннокентьевич Машинский – доктор геолого-минералогических наук.

Новосибирск, Scopus ID 8886240600

Eduard I. Mashinskii – Dr. Sci. (Geol. and Min.).

Novosibirsk, Scopus ID 8886240600

MashinskiiEI@ipgg.sbras.ruИнститут нефтегазовой геологии и геофизики им. А.А. Трофимука Сибирского отделения Российской академии наукРоссияTrofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russian FederationRussian Federation202320042023812229Copyright © Mashinskii E.I., 20232023Машинский Э.И.Mashinskii E.I.This work is licensed under a Creative Commons Attribution 4.0 License.https://mst.misis.ru/jour/article/view/468

In rock physics, much attention has been paid to the study of the processes of strain of natural materials    at small strains. Experiments using high-precision measurements have allowed new knowledge at micro/nano level to be acquired. The microplasticity of solids is studied in materials science, but there is also data regarding some rocks. The property of microplasticity of natural materials is still little studied.  The study was carried out on rock samples. The effect of strain amplitude and confining pressure on the velocity and attenuation of P and S waves in dry and water-saturated sandstone has been studied. The method of reflected waves was used in the frequency range of 0.5–1.4 MHz at four strain amplitudes (0.5–1.67)·10−6 Amplitude cycling causes an open and closed hysteresis effect for wave velocity and attenuation. This has been observed for both dry and water-saturated sandstone. The hysteresis loop overlaps in both states. The amplitude changes in the velocity of P-wave in dry sandstone is 1.12 %, and the attenuation of P-wave in dry sandstone is 5.43 %. As for S-wave, its maximum attenuation in dry sandstone reaches 8.81 %. The behavior of a wave velocity and attenuation can be explained by the combined effect   of viscoelasticity and microplasticity. Elastoplastic transition strongly depends on the details of the microstructure, its defectiveness, and other parameters. The characteristics of the complications of wave parameters can be the signs of the internal structure of the subject.

В физике горных пород большое внимание уделяется изучению процессов деформирования природных материалов на малых деформациях. Эксперименты проводятся с помощью высокоточных измерений, которые позволяют получить новые знания на микро/нано уровне. Микропластичность твердых тел изучают в материаловедении, но имеются также данные, полученные для некоторых горных пород. Свойство микро-пластичности природных материалов пока мало изучено. Исследование проводилось на образцах пород. Изучено влияние амплитуды деформации и всестороннего давления на скорость и затухание Pи S-волн в сухом и водонасыщенном песчанике. Использовался метод отраженных волн в диапазоне частот (0,5–1,4) МГц при четырех амплитудах деформации (0,5–1,67)·10−6 Циклическое изменение амплитуды вызывает эффект открытого и закрытого гистерезиса для скорости волны и затухания. Это наблюдается как для сухого, так и водонасыщенного состояния песчаника. В обоих состояниях имеет место перехлест петлей гистерезиса. Амплитудное изменение скорости P-волны в сухом песчанике составляет 1,12 %, а для затухания P-волны в сухом песчанике – 5,43 %. На S-волне максимальное затухание в сухом песчанике достигает 8,81 %. Поведение скорости и затухания волны можно объяснить совместным действием процессов вязко-упругости и микро-пластичности. Упругопластический переход сильно зависит от деталей микроструктуры, ее дефектности и других параметров. Характеристики осложнений параметров волн могут являться признаками внутреннего строения исследуемого объекта.

физика горных породамплитудно-зависимые скорость волны и затуханиеоткрытый гистерезис скорости и затухания волнывлияние водонасыщения на скорость волны и затуханиемикропластическая деформацияскачкообразная неупругостьупругий модульrock physicsamplitude-dependent wave velocity and attenuationopen hysteresis of wave velocity and attenuationeffect of water saturation on wave velocity and attenuationmicroplastic strainstepwise inelasticityelastic modulusРабота выполнялась в рамках проекта НИР «Механизмы воздействия природных и техногенных факторов на процессы в геосферах по результатам мониторинга естественных геофизических полей». Номер проекта в ИСГЗ Минобрнауки FWZZ-2022-0019The study was carried out within the framework of the research project “Mechanisms of the impact of natural and man-made factors on processes in the geospheres based on the results of monitoring natural geophysical fields”. 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The authors declare that there are no conflicts of interest present.