1991 Volume 53 Issue 3 Pages 93-102
Agricultural soils are exposed to transient machinery loads during traction or soil working processes. Mechanically induced soil compaction is dynamic in behavior and its major cause is vehicular load. This paper presents an experimental study on the dynamic response of unsaturated sandy loam soil to confined undrained impact compression that characterizes mechanism of dynamics of soil compaction. A 5∅×10cm cylindrical soil specimen was confined with 50kPa and compacted with a falling of mass, generating impact speed of 1.5-2.8m/s and impact stress of 50-150kPa, The stress wave propagation and the duration of the resistance of soil to impact compression were about 200μs and 2ms, respectively. The volumetric strain of 4-9% was attained as the result of confined impact compression.
