No abstract

The vegetation method has been usually and widely used in order to control the erosion on slope surface. In sandy soil slopes, however, the vegitation often cannot be sufficiently carried out because in such soils, the erosion occurs within a short period after planting vegetation or seeding . Therefore, it is necessary to stabilize the slope surface temporarily until the vegitation has covered the surface .In this paper, a temporary stabilization method, in which the mixed solution of iron-salt and lime is sprayed on the slope surface, is proposed. To examine the validity of the proposed method , soml aboratory tests were carried out on sandy soils by adding the solution of iron-salt and lime mixed in various ratios.The results are summarized as follows: 1. The appropriate mixture ratio of iron-salt and lime is about 7:3. 2. The internal friction angle of soil is increased by mixing it with iron-salt and lime. 3. The strength increase is considered to be caused by the action of iron oxide as a cementing agent between the soil particles.