ВЛИЯНИЕ ЦИКЛОВ ВЫСУШИВАНИЯ-УВЛАЖНЕНИЯ НА МИКРОСТРУКТУРУ И МЕХАНИЧЕСКИЕ СВОЙСТВА ВЫВЕТРЕЛЫХ ГРАНИТНЫХ ПОРОД Effects of drying-wetting cycles on microstructure and mechanical property of granite residual soils

Ran An, Lingwei KONG, Chengsheng LI

Аннотация


Для изучения влияния циклов высушивания-увлажнения на микроструктуру и механические свойств выветрелых гранитных пород были проведены испытания на трехосный сдвиг и магнитно-резонансное сканирование. Выявлена взаимосвязь между распределением пор и параметрами прочности на сдвиг, а также микроскопический механизм воздействия циклов сушки-увлажнения.
Кривая объемного распределения пор выветрелого гранита показала основной и вторичный пики, которые соответствуют микро- и макропорам соответственно. По мере увеличения числа циклов высушивания-увлажнения пропорции распределения микропор оставались почти постоянными, в то время как макропор – резко изменялись. Исследования показали, что пористость нелинейно возрастала с увеличением числа циклов высушивания-увлажнения. Тенденция к ослаблению механических свойств развивалась синхронно с развитием повреждений микроструктуры, что обусловлено воздействием сил набухания на стенки пор и потерями мелких частиц глины.

Полный текст статьи публикуется в английской версии журнала «Soil Mechanics and
Foundation Engineering” vol.58, No.6


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