防渗土体掺盐后工程特性试验

Test of engineering properties of impervious soil with salt

为研究防渗土体在掺入食盐后的工程特性变化，测定符合设计规范要求的掺盐量，分别在水库大坝和河道堤防的防渗土样中掺入不同类型、不同掺量的食盐，进行土样物理化学及力学特性试验。试验结果表明：低液限黏土在精盐掺量不大于3．29％，混合盐掺量不大于2．99％时，水溶盐质量分数均符合规范要求；在试验的掺盐范围内，渗透系数均在1×10^-7 -7．9×10^-7cm／S之间，满足规范要求，其他指标虽有变化，但变幅不大。

In order to study changes in engineering properties of impervious soil with salt and to determine the critical value of salt content that conforms to design criterion, experiments were performed for testing physical, chemical, and mechanical properties of samples. These impervious soil samples were taken from river embankment and reservoir dam, and then they were mixed with various kinds and amounts of salt. The results show that the salt contents, in low liquid limit clay, all conform to the criterion with refined salt no more than 3. 29% and mixed salt no more than 2. 99%. Within the tested salt content range, the permeability coefficients are all between 1 × 10-7 cm/s and 7. 9 × 10-7 cm/s, which satisfy the criterion. Moreover, other indicators in experiments do change, but not much.