Many studies have emphasized that the structure or fabric of deeply weathered tropical soils has important influences on their engineering behavior. This study attempts to characterize the structure of five soils from the island of Oahu, Hawaii, by mercury injection porosimetry. All the soils were derived from basalt, but each had weathered under a different mean annual rainfall. A comparison of air-dried, oven-dried, and freeze-dried samples showed that the method of drying has little effect on the pore size distribution and is interpreted as evidence that the structure of these soils is more stable than that of soils in which the main bonding material is clay. From 89 to 72 percent of the voids in these soils fall within a size range greater than 0.004 mu m. Although the void ratio variations between these soils do not show any systematic trends, the pore size distributions do. The soils that had developed under wetter climates have higher percentages of pores smaller than 2 mu m in diameter and a more uniform pore size distribution. The pore size distributions can be related to the mineral and chemical contents of the soils in that soils weathered in wetter environments are higher in Sesquioxide content and lower in kaolinite content. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 76-79
  • Monograph Title: Subsidence over mines and caverns, moisture and frost actions, and classification
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00158155
  • Record Type: Publication
  • ISBN: 0309025885
  • Files: TRIS, TRB
  • Created Date: Sep 28 1977 12:00AM