水物理化学效应下砂岩内变量蠕变本构模型研究

he creep behavior of sandstones were studied by performing a series of uniaxial compression creep tests on dry, saturated sandstones, and the sandstones with hydro-physico-chemical effect subject to the circulating flow of different hydro-chemical solutions. The circulating flow of hydro-chemical solution had both hydro-physical effect and hydro-chemical effects on the sandstones, which changed the internal constituent and structure, therefore, the creep behavior of sandstones were changed. The internal variable theory is based on the internal structure variable, i.e., interbal variable. Based on the creep data, using irreversible strain as internal variable, the internal variable creep constitutive model of sandstone with hydro-physico-chemical effects was proposed. The fitting of test data into the model shows that the internal variable creep model is capable of describing the creep behavior of sandstones under complicated hydro-physico-chemical effects.