Agricultural Engineering Exam  >  Agricultural Engineering Notes  >  Soil Mechanics Notes- Agricultural Engineering  >  Introduction to Bore Hole Spacing and Depth, Soil Mechanics

Introduction to Bore Hole Spacing and Depth, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering PDF Download

The number of bore holes depends on:

(i) Type and size of the project

(ii) Budget for site investigation

(iii) Soil variability

The bore holes have to be located where the loads are expected.


SPACING OF BORINGS (Das, 1999)

Introduction to Bore Hole Spacing and Depth, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering 


Minimum depth of boring (ASCE, 1972)

  • Determine the net increase of stress, Δσ, under the foundation (as shown in Figure 1) 
  • Estimate the variation of the vertical effective stress, σ'v , with depth
  • Determine the depth D = D1, at which stress increase Δσ  = q/10, where q = estimated net stress on the foundation
  • Determine the depth D = D2, at which Δσ/ σ'v = 0.05.
  • Unless bedrock is encountered, the smaller of the two depths, D1 and D2 will be the approximate minimum depth of boring required.

Introduction to Bore Hole Spacing and Depth, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

Fig. 32.1.

The minimum depth of boring for a building with a width of 30.5 m (100 ft) will be as follows (Sowers and Sowers, 1970)

Introduction to Bore Hole Spacing and Depth, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering

The document Introduction to Bore Hole Spacing and Depth, Soil Mechanics | Soil Mechanics Notes- Agricultural Engineering is a part of the Agricultural Engineering Course Soil Mechanics Notes- Agricultural Engineering.
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