Answered: Sand Clay H Hj fill fill L Neutral Sand…

Engineering

Civil Engineering

Sand Clay H Hj fill fill L Neutral Sand plane Clay (b) (a) Figure 9.42 Negative skin friction

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter3: The Structure Of Real Materials

Section: Chapter Questions

Problem 3.12P

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Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

Refer to Figure 9.42b. Let L = 18 m, γ_fill = 17 kN/m³, γ_sat(clay) = 19.8 kN/m³, Φ'_clay = 20°, H_f = 3.5 m, and D (pile diameter) = 406 mm. The water table coincides with the top of the clay layer. Determine the total downward drag force on the pile. Assume ẟ' = 0.6 Φ'_clay.

Sand
Clay H
Hj
fill
fill
L
Neutral
Sand
plane
Clay
(b)
(a)
Figure 9.42 Negative skin friction

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