膨润土膨胀特性试验研究

Experimental study on the expansion properties of bentonite

膨润土在我国分布广泛,了解膨润土的膨胀特性至关重要。本文通过开展室内试验,探讨了膨润土的膨胀量和膨胀力随初始含水率、固结压力等的变化规律。结果表明,膨润土膨胀量随时间的变化分为快速直线膨胀阶段和慢速膨胀阶段,膨胀力、膨胀量等均随初始含水率的增加呈幂函数规律降低,膨胀量随固结压力的增加同样呈幂函数规律降低。最后,提出了膨胀力及膨胀量的预测方法,为膨润土膨胀特性研究提供了参考。

Bentonite are widely distributed in our country,it is very important to understand the expansion characteristics of bentonite.It discussed the expansion capacity and force changing with the initial moisture content and consolidation pressure by the method of laboratory test.The results show the expansion amount of bentonite is divided into fast linear expansion stage and slow swelling phase along with the change of time.At the same time,the expansion force and expansion capacity decrease along with the increase of initial moisture content of the law of power function,the expansion capacity also decreases along with the increase of consolidation pressure of the law of power function.At last,the prediction method of expansion force and expansion capacity is proposed,providing reference for expansion properties of bentonite.