云应盐矿盐岩蠕变特性试验研究

针对我国盐矿盐岩杂质多、泥岩夹层多的特点,通过对云应盐矿盐岩、含夹层盐岩两种不同盐岩试样进行不同围压、不同轴压下的蠕变试验,研究云应盐矿两种岩样的蠕变特性,通过试验数据建立其蠕变本构关系,并获得相应的蠕变参数。通过对两种岩样的蠕变参数比较发现,含夹层盐岩的稳态蠕变率对偏应力变化的的敏感性要略高于纯盐岩,而其对围压变化的敏感性要远低于纯盐岩。研究结论可用于盐岩体工程长期稳定性分析中。

EXPERIMENTAL STUDY ON CREEP BEHAVIORS OF ROCK SALT IN YUNYING SALT MINE

Considering the characters of rock salt that there are plentiful impurity and mudstone interlayers in the salt mines in China,the creep behaviors of rock salt samples and rock salt samples with mudstone interlayers in Yunying salt mine are studied by creep experiments under different confining pressures and deviatonic stresses.The steady creep constitutive law is established from the experimental data.The creep parameters are also obtained.Comparison of creep parameters between the rock salt and the rock salt with interlayers shows that the influence of deviatonic stresses on the steady creep strain velocity of rock salt with interlayers is more obvious than that of rock salt.The effect of confining pressure on the steady creep strain velocity of rock salt with interlayers is much lower than that of the rock salt.The presented conclusions can to be used in long-term stability analysis of rock salt projects.