Lesson 1/Learning Event 2
Learning Event 2
SUBGRADE, SUBBASE, AND BASE FACTORS
Subgrade Factors to be Considered
The information obtained from the exploration and tests previously referred to should be adequate to
enable full consideration of all factor affecting the suitability of the subgrade and subsoil. The primary
factors are as follows:
General characteristics of the subgrade soil
Depth to ledge rock
Depth to water table
Compaction that can be attained in the subgrade and the adequacy of the existing density in
layers below the zone of compaction requirements
CBR that the compacted subgrade, uncompacted subgrade, and subsoil will have under future
conditions
Presence of weak or soft layers in the subsoil
Susceptibility to detrimental frost action
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