ПОЛЕВОЕ ИССЛЕДОВАНИЕ СВАЙ В СЛАБОМ ГРУНТЕ, УСИЛЕННЫХ ЦЕМЕНТАЦИЕЙ Field study on the uplift bearing characteristics of grouted micropiles in soft soil

Rui Zhu, Rongzhen Su, Feng Zhou

Аннотация


Представлены результаты экспериментальных исследований на выдергивающую нагрузку свай, усиленных путем инъекции в грунт вокруг сваи цементного раствора. Дается краткий обзор выполненных ранее другими авторами исследований. Утверждается, что для увеличения сил трения по боковой
поверхности свай целесообразно выполнять двукратную инъекцию цементного раствора в грунт вокруг сваи. Исследования выполнялись на опытных площадках, сложенных слабыми глинистыми грунтами. Показано, что при однократной инъекции сопротивление сваи выдергиванию за счет трения увеличивается на 31,4…51,3%, а при двукратной по сравнению с однократной - до 59,4…122%. Приводится анализ закономерностей изменения сил трения на боковой поверхности свай, изготовленных по различным технологиям. Показывается, что закрепление грунтов цементным раствором не влияет на распределение растягивающих усилий в свае по глубине. При этом с ростом длины свай увеличивается перемещение, при котором достигается предельное состояние по грунту.


Полный текст статей публикуется в английской версии журнала
«Soil Mechanics and Foundation Engineering”, vol.59, No.5


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