黏土的蠕变特性试验研究

Experimental research on creep property of clay

研究了黏土的未扰动和重塑土样在三轴排水剪切试验条件下的蠕变特性。既进行了初始加载过程中的蠕变试验,也做了卸载与重复加载过程中的蠕变试验。试验结果表明:(1)在初始加载过程中,经过一定时间蠕变后黏土的强度有很大的提高;(2)在卸载过程中,随应力值下降黏土的蠕变表现出由正蠕变、中性蠕变到负蠕变的逐渐转化;(3)在重复加载过程中,随应力值增加黏土的蠕变表现出由负蠕变、中性蠕变到正蠕变的逐渐转化。

Creep property of undisturbed and reconstituted Japanese clay was presented based on drained triaxial compression tests. Creep tests were performed several times during monotonic primary loading, unloading and reloading. Test results show that： （1） the amount of creep deformation during monotonic primary loading depends on strain rate before creep, creep stress level, and creep time; （2） during monotonic primary loading, the stiffness increasing magnificently shortly after creep; （3） the direction of creep will change from positive creep; to neutral creep and negative creep during unloading, while during reloading, it will change from negative, to neutral and positive creep.