ЭКСПЕРИМЕНТАЛЬНОЕ ИССЛЕДОВАНИЕ МЕХАНИЧЕСКИХ СВОЙСТВ И ПРОНИЦАЕМОСТИ ПЕСЧАНИКА ПОСЛЕ ВЫСОКОТЕМПЕРАТУРНОЙ ОБРАБОТКИ Experimental study on the mechanical permeability characteristics of sandstone after high-temperature treatment

Zhinan Lin, Husheng Xiao, Jiaquan Wang, Yue Li

Аннотация


Исследованы механические свойства и проницаемость песчаника, подвергнутого воздействию высоких температур. Проведена серия экспериментов с использованием трехосной испытательной системы Rock Top 50HT для анализа влияния различных температурных режимов и всестороннего давления на механические характеристики и проницаемость песчаника. Для термически обработанных образцов изучено изменение пористости и скорости распространения волн, выполнены исследования на сканирующем электронном микроскопе, проведен термогравиметрический анализ и оценка проницаемости.
В результате эксперимента установлено, что повышение температуры увеличивает количество микро- и мелких пор в песчанике, при одновременном снижении доли средних и крупных пор. Однако при росте температуры выше 300°C, наблюдается обратная тенденция. В условиях высокого всестороннего давления в песчанике наблюдается снижение проницаемости. Снижение обжимающего давления приводит к увеличению проницаемости. При испытаниях на трехосное сжатие происходит сдвиговое разрушение образца песчаника; по мере роста температуры степень дробления на поверхности сдвига становится
более выраженной. При росте температуры первоначально наблюдается значительное снижение пиковой прочности песчаника, однако при температуре выше 500°C прочность грунта заметно возрастает. Температура оказывает наиболее значительное влияние на порог образования трещин.

Полный текст статьи публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering”, vol.63, No.3


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