土体性质对Cl-迁移过程影响的试验研究

通过室内土柱试验模拟污染物迁移,分析了平均粒径、孔隙比、不均匀系数等土体性质对迁移规律的影响。试验结果表明:平均孔隙流速随着土样平均粒径的增大而增大,初始穿透时间随着土样孔隙比变大而缩短;弥散系数随着平均粒径、孔隙比的增大而增大。通过试验数据拟合得到符合试验土样的弥散系数经验公式。试验结果为污染土体及地下水体的防治工作提供依据。

Experimental Research of the effect of soil propertiesin migration process of Cl-

In order to clarify the specific impact of soil properties such as pore ratio, average particle diameter and coefficient of uniformity, soil column experiments were carried out to simulate the migration of contaminants and relationship between material nature and migration of NaCl solution in quartz sand were analyzed. The researches indicated under the same conditions of head and void ratio, bigger void ratio leads to shorter time of the initial penetration and greater dispersion coefficient. The average pore velocity and dispersion coefficient are found to increase with the increase in average particle diameter. The diffusion coefficient was calculated by test data and the experience formulas of diffusion coefficient were inferred. The results provide an evidence for the prevention and control of soil and underground water pollution.