(c) A stable underground wall, at rest, is subjected to lateral pressure and water pressure as shown in FIGURE Q4(c). The total depth of the underground wall is 10 m and the water table is at 5 m below the ground surface. The soil's yt is 19.5 kN/m³, and o' is 38° for this normally compacted sandy soil. (i) Compute and sketch the effective at-rest lateral earth pressure and water pressure distributions against the wall. (ii) Determine the resultant force against the wall and its point of application.

(c) A stable underground wall, at rest, is subjected to lateral pressure and water pressure as shown in FIGURE Q4(c). The total depth of the underground wall is 10 m and the water table is at 5 m below the ground surface. The soil's yt is 19.5 kN/m³, and o' is 38° for this normally compacted sandy soil. (i) Compute and sketch the effective at-rest lateral earth pressure and water pressure distributions against the wall. (ii) Determine the resultant force against the wall and its point of application.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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

(c) A stable underground wall, at rest, is subjected to lateral pressure and water
pressure as shown in FIGURE Q4(c). The total depth of the underground wall is
10 m and the water table is at 5 m below the ground surface. The soil's yt is 19.5
kN/m³, and o' is 38° for this normally compacted sandy soil.
(i)
Compute and sketch the effective at-rest lateral earth pressure and water
pressure distributions against the wall.
(ii)
Determine the resultant force against the wall and its point of application.

5 m
5 m
FIGURE Q4(c): Cross Sectional View of an Underground wall

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