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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

The cone penetration resistance (qc) and sleeve-frictional resistance (fc) obtained during a subsoil exploration program are shown in Figure 17.17. A square footing (B = 1.5 m) is to be constructed at a depth of 1 m. Estimate the type of soil within a distance of 2B below the footing. Use the Robertson et al. correlation chart (Figure 17.13)

images

Figure 17.17

To determine

Find the type of soil within a distance of 2B footing.

Explanation

Given information:

The square footing B is 1.5m.

The depth of footing 1m.

Calculation:

Find the distance B of the footing as follows:

Substitute 1.5m for B.

2B=2×1.5B=3m

  • Cone penetration resistance and sleeve friction area averaged up to 3m footing.(depth of 4m from the surface).

Refer to Figure 17.17 in the textbook.

Take the value of (qc)  and sleeve friction (fc) resistance using figure 17.17 as shown in Table 1.

Depth (m)qc(kN/m2)(fc)kN/m2
14,20090
23,50070
34,50050
44,800100

Find the average value of cone penetration resistance using Table 1.

qc=4,200+3,500+4,500+4,8004=17,0004=4,250kN/m2

Find the average value of friction area averaged using Table 1

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