Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 13, Problem 13.24P
a)
To determine
Draw the variation of Rankine’s active pressure on the wall with depth.
b)
To determine
Find the depth
c)
To determine
Find the total active force
d)
To determine
Find the total active force
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Answer d and e
A fixed retaining wall is backfilled to height of 10m with dry cohesionless sand. The resulting backfill has
a unit weight of 18kN/m³ and a drained angle of internal friction of 36°.
a.
Prior to backfilling, what is the horizontal stress (kPa) at a depth of 10m below the final
elevation of the finished backfill?
b. Assuming that the overconsolidation ratio of the soil in the backfill at a depth 10m below the
surface is equal to 2.0, what is the corresponding effective horizontal stress at a depth of 10m
below the top of the backfill?
c. If a 200kN/m² surcharge is then applied to the surface of the backfill in the previous item (b),
what will be the effective horizontals stress (kPa) at a depth of 10m below the top of the
backfill?
d.
If the surcharge in the previous item (c) is reduced to 25kPa, what will be the effective
horizontal stress at a depth of 10m below the top of the backfill?
e.
If the surcharge in the previous item (d) is increased to 100kPa, what will be the effective…
Determine the stability of the cantilever gravity retaining wall shown in figure below.
The existing soil is a clay and the backfill is a coarse-grained soil. The base of the wall
will rest on a 50-mm-thick, compacted layer of the backfill. The interface friction between
the base and the compacted layer of backfill is 25.0°. Groundwater level is 8 m below the
base.
1.0 m
Batter
1:20
0.4 m
1.8 m
9, = 20 kPa
8⁰
Ysat = 18 kN/m³
cs = 25°
8 = 15⁰
Backfill
Drainage blanket
Y = 23.5 kN/m³
3 m
Existing
soil
6.1 m
0.9 mi
Ysat = 19 kN/m³
= 35°
% = 25°
Chapter 13 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 13 - Prob. 13.1PCh. 13 - Prob. 13.2PCh. 13 - Prob. 13.3PCh. 13 - Prob. 13.4PCh. 13 - Prob. 13.5PCh. 13 - Prob. 13.6PCh. 13 - Prob. 13.7PCh. 13 - Prob. 13.8PCh. 13 - Prob. 13.9PCh. 13 - Prob. 13.10P
Ch. 13 - Prob. 13.11PCh. 13 - Prob. 13.12PCh. 13 - Prob. 13.13PCh. 13 - Prob. 13.14PCh. 13 - Prob. 13.15PCh. 13 - Prob. 13.16PCh. 13 - Prob. 13.17PCh. 13 - Prob. 13.18PCh. 13 - Prob. 13.19PCh. 13 - Prob. 13.20PCh. 13 - Prob. 13.21PCh. 13 - Prob. 13.22PCh. 13 - Prob. 13.23PCh. 13 - Prob. 13.24PCh. 13 - Prob. 13.25PCh. 13 - Prob. 13.26PCh. 13 - Prob. 13.27PCh. 13 - Prob. 13.1CTP
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