Particle breakage and erodibility of compacted soil
1990
Takuma, K. (Tottori Univ. (Japan). Faculty of Agriculture) | Kono, H. | Hiyama, H.
Weathered soils of granite (decomposed granite soil) which were found in the northern part of Kyushu were investigated from the viewpoints of grain size distribution and splash erosion, considering some nature of decomposed granite soil and breaking characteristics of particles of weathered granite by external force such as compaction. Value of ignition loss of decomposed granite soils is effective for determining degree of weathering, and effective also for evaluating the characteristics of decomposed granite soils. By the breaking of particles of decomposed granite soil, gravel fraction in sandy soil which contains fine-grained fraction, shows decrease and also increase of sand fraction, and sandy soil shows decrease of sand fraction and increase of fine-grained fraction. In either way, tendencies of change are directed to increase of fine particles. Moreover, by the breaking of particles, a tendency of concentration in direction to certain fine-grained fraction was observed. This tendency was observed also in specific surface area, and the existence of certain limiting region of particle breakage by compaction is estimated. In the second place, in the case of splash erosion, rate of splashing shows increase following particle breakage, and showed decrease of coefficient of permeability
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