Foundations Open and Braced Excavations.

An open excavation is defined as an excavation that has stable and unsupported side slopes. Table 16.1 presents a discussion of the general factors that control the excavation stability and Table 16.2 The A and B coefficients as obtained by Reese and Matlock lists factors that control the stability of excavation slopes in some problem soils.

A braced excavation is defined as an excavation where the sides are supported by retaining structures. Figure 11.17 shows common types of retaining systems for braced excavations. Table 16.3 lists the design considerations for braced excavations and Table 16.4 indicates factors that are involved in the choice of a support system for a deep excavation.


Mass pier criteria
Fig. 11.17 Mass pier criteria.


Typical values of n, for cohesive soils
Table 16.1 Typical values of n, for cohesive soils (Taken from Poulos and Davis, 1980)Añadir leyenda



TABLE 16.3 Design Considerations for Braced Excavations
Design Considerations for Braced Excavations





TABLE 16.4 Factors that are Involved in the Choice of a Support System for a Deep Excavation
Factors that are Involved in the Choice of a Support System for a Deep Excavation

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