添加剂对土体的加固作用及冻胀防治研究

将研制的高分子有机材料作为添加剂，加入到土体中，经过拌和夯实、干燥固结，能够起到稳定和提高土体的强度，并具有低渗透和低吸水等特性．冻胀试验表明：加入添加剂不仅能阻止土体冻胀的产生、外来水源的入侵及水分的迁移，还能隔断土体孔隙之间的联系，使水分在土体孔隙中不能运移，从而达到了防治冻胀的目的。

Study of Soil-reinforce Effect and Frost-heaving Prevention Effect of Additive

The authors invent a macromolecule organic material as an additive. It mixes with soil in optimum moisture content and then compacted, desiccated and concreted. The material not only increase the groundwork soil strength, but also make the soil have many favorable features, such as low penetrability and low absorbability etc. Application of this material in pavement engineering is very favorable for environment conservation and cost reducing. So the macromolecule material is looked as a new kind of pavement materials. In laboratory, soil mixed with the additive is tested to verify the property of frost heave. The test results show: 1) When the test finished, there was no or less frost heaving (less than 1%) in the sample, no matter in a close system or in an open system; 2) When samples are tested in an open system that the sample is supplied with water during experimental processing, no water enters into the sample; 3) When the test finished, moisture content of frozen soil and unfrozen soil do not change clearly. The reason is that in the freezing process, the additive mixed with soil will change from liquid to colloid in the soil pore along with temperature decreasing. The change prevents the soil from frost heaving, water penetration, but also interdicts from the contact of soil pore, reducing water migration in pore. Thus frost heaving is prevented. This material used for preventing frost heaving in cold region engineering will have the significance of further popularizing and using.