酸性环境下胶结充填体渗透性研究

Permeability of Cemented Backfill in Acidic Water Environment

为研究酸性环境下胶结充填体的渗透性能,开展变水头渗流试验及强度试验,测试充填体在不同灰砂比、养护条件下的强度和渗透性指标。试验结果表明,灰砂比1∶6时,胶结充填体的渗透系数为(0.83~1.15)×10^(-6) cm/s;灰砂比1∶20时,胶结充填体的渗透系数在(3.85~3.9)×10^(-4) cm/s;灰砂比越大,充填体的强度越大,渗透系数越小,渗透性越差。酸性溶液对胶结充填体的内部结构造成了腐蚀损害,使充填体的渗透性增强,且酸性水浸泡条件下的充填体渗透系数普遍大于自然养护状态下的渗透系数。

In order to study the permeability of cemented backfill under acid water environment,variable water head seepage test and strength test were carried out to test the strength and permeability coefficient of backfill under different lime sand ratio and curing conditions.The test results show that the permeability coefficient of cemented backfill is(0.83~1.15)×10^(-6) cm/s when the ratio of lime to sand is 1∶6.When the cement-sand ratio is 1∶20,the permeability coefficient of cemented backfill is(3.85~3.9)×10^(-4) cm/s.The higher the ratio of lime to sand,the stronger the filling body,the smaller the permeability coefficient and the worse the permeability.The acid solution causes corrosion damage to the internal structure of the cemented backfill,which enhances the permeability of the backfill,and the permeability coefficient of the backfill in the natural curing state under the condition of acid water immersion is generally greater than that under the natural curing state.