The topgraphical and climatic conditions and the problematic characteristics of road construction in Japan are reviewed, and features of road earth works are discussed. Soil investigation and quality control are described. A soil profile is usually prepared by means of simple soundings, and detailed investigations are conducted by mechanical boring and sampling. Some typical field measurement methods have been developed to determine the bearing capacity of the subgrade and subbases. Problems of earth works with cohesive soil of high water content (especially volcanic ash) are discussed. Effort has been made to reduce the contact pressure of machines by increasing the width of caterpillars etc., or decreasing the air pressure of tires. It has been observed that the sticky soil which was remolded during operation of works may have a considerable thixotropic regain and restoration of bearing capacity is considerable. It is accompanied by the effect of drying with the lapse of time. Counter measures for soft ground are considered. Several ways have been tried for the prevention of embankment settlement displacement of press-in compacted sand column for the soft soil after placing compacted sand pile on the foundation of embankment; forced consolidation; and concentration of the loads of embankment on the sand column. This compacted sand pile also serves for preventing slips of foundations of the embankment and other structures on the soft ground.

  • Corporate Authors:

    Japan Commercial Gazette

    2-Chome, Naka-Cho, Kanda, Chiyodaku
    Tokyo,   Japan 
  • Publication Date: 1966-2

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00083780
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM