1991 Fiscal Year Final Research Report Summary

Soil structure and engineering properties of cohesive soils varied country rock and degrees of weathering related to fractal dimension

Research Project

Project/Area Number	02660240
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	農業土木
Research Institution	Ehime University
Principal Investigator	MIYAUCHI Sadaki Ehime University, Agriculture, Professor, 農学部, 教授 (40024583)
Co-Investigator(Kenkyū-buntansha)	SAKAI Toshinori Ehime University, Agriculture, Assistant, 農学部, 助手 (90215591)
Project Period (FY)	1990 – 1991
Keywords	Country Rock / Weathering / Soil Structure / Fractal Dimension / Compaction Curve / Soil Strength / Permeability / Land Slide
Research Abstract	1. We examined physical, chemical and mechanical properties of soils picked by depth from drainage well which have different country rock and land slide area in metamorphic rock and granite. As a result, there were hard weathered Layers where about 4m or 8m from the surface layer. 2. We treated a cohesive soil originated in sedimentary rock with repeated immersing, freezing and drying, and examined changes in physical and mechanical properties. (1) Water retentivity between pF1.0 and 1.5 fall with cyclic treatment. (2) With cyclic treatment, optimum moisture content fall down, but maximum dry density, unconfined compressive strength and stress relaxation time over optimum moisture content increase. (3) With cyclic treatment, soil aggregates remarkably change in quality and quantity. 3. The shape of soil aggregates and soil particle can be indicated on fractal demension.

(4 results)