FOUNDATIONS STRUCTURES: STABILIZATION OF SUBGRADE SOILS.

General.

a. The applicability and essential features of foundation soil treatments are summarized in tables 16-1
and 16-2 and in figure 16-1.  The depth of stabilization generally must be sufficient to absorb most of the foundation pressure bulb.

b. The relative benefits of vibrocompaction, vibrodisplacement compaction, and precompression
increase as load intensity decreases and size of loaded area increases.  Soft, cohesive soils treated in place are generally suitable only for low-intensity loadings.  Soil stabilization of wet, soft soils may be accomplished by addition of lime; grout to control water flow into excavations to reduce lateral support requirements or to reduce liquefaction or settlement caused by adjacent pile driving; seepage control by electroosmosis; and temporary stabilization by freezing.  The range of soil grain sizes for which each stabilization method is most applicable is shown in figure 16-1.

Applicable grain-size ranges for different stabilization methods.
Figure 16-1.  Applicable grain-size ranges for different stabilization methods.

Stabilization of Soils for Foundations of Structures
Table 16-1.  Stabilization of Soils for Foundations of Structures

Applicability of Foundation Soil Improvement for Different Structures and Soil Types
Table 16-2.  Applicability of Foundation Soil Improvement for Different Structures and Soil Types

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