滨海地区改良软土会受到海水的长期浸泡作用，为获得其力学性能随时间的演化规律，依据海水的主要物质成分和含量制备了盐水溶液。选取天津滨海新区的软土，掺入15%的水泥进行养护，为便于对比分析，选用有机质含量低的粉土作比较。为了说明盐溶液浸泡的作用，进行了盐水和淡水两种浸泡方式的对比试验。无侧限抗压强度试验结果表明，改良软土历经淡水溶液和盐溶液浸泡3 d后其强度差值达到最大，7 d和28 d养护龄期试样分别相差0.40、1.28 MPa，建议利用28 d的标准养护龄期强度作为设计参考值。利用Geo-Studio中的Seep/W和CTRAN模块模拟了盐溶液离子浸入试样的过程，发现离子在试样内部迁移2～3 d趋于平稳，主要迁移至离试样表层5 mm的区域范围内，数值计算结果与宏观力学试验结果相一致。

The soft soil in coastal area will be affected by the long-term immersion of the brine, in order to obtain the evolution law of mechanical properties with time, on the basis of the main composition of the brine content and preparation of the brine solution. Selection of Tianjin binhai new area of soft soil, mixed with 15% cement for maintenance. In order to illustrate the effect of salt solution immersion, the salt water and fresh water soaking two way contrast test are carried out. Unconfined compressive strength test results show that the improvement of soft clay after fresh water solution and salt solution immersion in 3 days, reached its maximum intensity difference; 7 d and 28 d curing age sample are respectively 0.40, 1.28 MPa. Then, using the Seep/W and GEOSTUDIO CTRAN module to simulate the process of salt ion in brine immersed specimens, it is found that salt solution ion in sample 2-3 days after, internal migration into the 5 mm under sample surface area, tends to steady. The results of numerical calculation is consistent with the experimental phenomena.