機械化施工と水田基盤特性 粘質土傾斜地水田のホ場整備に関する農地工学的研究(II)

In case of consolidating clayey paddy field in the sloped area, there usually a great deal of the earth work is requied ―　cutting and banking and the soil is highly moistened. To clarify the effect of such working conditions on the properties of the field after consolidation, investigations are made of the number of times of pass of bulldozer, soil moisture and density, corn index, and settlement of the field. The results that obtained are : a) There are considerable variations of the properties of field soil in one lot after consolidation. b) The soil moisture conditions at the earth work so significantly affect the properties of soil as to show such variable conditions. c) Non-uniformity of soil density and bearing characteristic, and large pores in subsoil cause heterogenious settlement of the field, and partial subsidence. These results especially show the significant importance of soil moisture control at the earth work.