Abstract
This paper is intended as an investigation of water resistance on Kanto loam with rainfall. A great deal of effort has been made on the study of erosion since old times. What seems to be lacking, however, are studies about the dispersion of soil aggregation and the permeability for ground water. The purpose of this paper is to show how to decide the value of man — made slope design against erosion control. Permeability test,pF test,pinhole test were made to carry out the purpose. The tested samples were the undisturbed and the compacted samples of Kanto loam which were obtained from experimental fields of ROLLING LAND LABORATORY, Tokyo University of Agriculture and Technology. The pF test was carried out using the pressure plate apparatus to obtain to soil moisture characteristics curves .Pinhole test was made to the pinhole test apparatus that was improved the J.L.Sherard’s model. The conclusion are as follows ；
(1）Kanto loam is easily eroded with rainfall because it has the pores in 15〜17% of the soil volume,which is called “mesovoid” by Brewer s pore size classification system.
(2) Kanto loam compacted greater than 0.6g/cm3 in dry density has high water resistance of soil.
(3) The Water resistance of the undistubed Kanto loam is evidently different from that of the compacted soil.
