Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 15, Problem 15.24P
(a)
To determine
Calculate the required depth of sheet pile to be driven from the top.
(b)
To determine
Calculate the load on the tie rods.
(c)
To determine
Design a continuous anchor and show a sketch with dimensions.
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A proposed building is to have three levels of underground parking, as shown in the figure below. To
construct this building, it will be necessary to make a 10.0 m excavation, which will need to be
temporarily dewatered. The natural and dewatered groundwater tables are shown, and the medium
clay is normally consolidated. The dewatering of the area under the existing building caused an increase
in vertical effective stress.
- 28 m -
Existing building
A
B
Proposed
1.5 m building
Natural y.
Dewatered
y = 19.5 kN/mª
5 m
1.51
8.5 m
10 m
12.5 m
Sand-
(assume imcompressible)
2.5 m
Fy= 20:0 kN/m.
Medium clay C(1+ eo) = 0.26
y = 16.5 kN/m³
10.3 m
Stiff soils (assume imcompressible)
Unit weight of SAND above the water table is 19.5 KN/cum while that below the water table is 20
KN/cuM. The unit weight of CLAY is 16.5 KN/cyM.
The chief engineer is concerned that this dewatering operation may cause excessive settlement in the
adjacent building and has asked you to:
Compute for the anticipated…
The soil profile at a road construction site is as
shown in figure (not to scale). A large embankment
is to be constructed at the site. The ground water
table (GWT) is located at the surface of the clay
layers, and the capillary rise in the sandy soil is
negligible. The effective stress at the middle of
the clay layer after the application of the
embankment loading is 180 kN/m². Take unit
weight of water, Yw =
9.81 kN/m3.
Embankment load
boudi
Sand
GWT 2m
y = 18.5 kN°
it enit
Clay
Specific gravity, G̟ = 2.65
Water content, w = 45%
Compession index, C. = 0.25
6m
%3D
%3D
Impermeable layer
The primary consolidation settlement (in m, round
off to two decimal places) of the clay layer resulting
from this loading will be
A footing of size 2m×2m transferring a
pressure of 200 kN/m², is placed at a
depth of 1.5 m below the ground as
shown in the figure (not drawn to the
scale). The clay stratum is normally
consolidated. The clay has specific
gravity of 2.65 and compression index
of 0.3.
1.5m
1m
1.5 m
200 kN/m²
Silty sand
Clay
Ya =15kN/m³
Y sat = 18kN/m³
Y sat = 17 kN/m³
GWT
$0.5 m
Dense sand
Considering 2:1 (vertical to horizontal)
method of load distribution and
Y₁ = 10kN/m³, the primary consolida-
tion settlement (in mm, round off to two
decimal places) of the clay stratum is
Chapter 15 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 15 - Prob. 15.1PCh. 15 - Prob. 15.2PCh. 15 - Prob. 15.3PCh. 15 - Prob. 15.4PCh. 15 - Prob. 15.5PCh. 15 - Prob. 15.6PCh. 15 - Prob. 15.7PCh. 15 - Prob. 15.8PCh. 15 - Prob. 15.9PCh. 15 - Prob. 15.10P
Ch. 15 - Prob. 15.11PCh. 15 - Prob. 15.12PCh. 15 - Prob. 15.13PCh. 15 - Prob. 15.14PCh. 15 - Prob. 15.15PCh. 15 - Refer to the braced cut in Figure 15.50, for which...Ch. 15 - For the braced cut described in Problem 15.16,...Ch. 15 - Refer to Figure 15.51 in which = 17.5 kN/m3, c =...Ch. 15 - Refer to Figure 15.27a. For the braced cut, H = 6...Ch. 15 - Prob. 15.20PCh. 15 - Determine the factor of safety against bottom...Ch. 15 - Prob. 15.22PCh. 15 - The water table at a site is at 5 m below the...Ch. 15 - Prob. 15.24PCh. 15 - Prob. 15.25CTPCh. 15 - Figure 15.53 below shows a cantilever sheet pile...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- As soon as possible please.arrow_forwardA vane 100 mm in diameter and 200 mm in heights was pressed into soft clay in a borehole. The torque was applied and gradually increased to 100 N-m when failure took place. Determine the undrain shear strength.arrow_forwardThe plan of a flexiblerectangular loaded area is shown with a uniformly distributed load q =100 KN/m2. Determine the increasein the vertical stress (A6z) at Z= 2.0 meters bel ow (a) Point A = (b) Point B= (c) Point C= 4 m 1.6 m- 2 m 0.8 m q = 100 kN/m? C 1.2 m-arrow_forward
- Answers a) 0.917 b) 9.17 cm c) 1.08 Narrow_forwardQuestion attachedarrow_forwardIn a site consisting entirely of clays, an electric friction conepenetrometer measures the cone resistance qc at a depth of8.0 m as 0.75 MN/m2. The water table is at 3.0 m below theground level. The unit weights of the clay above and belowthe water table are 16.5 kN/m3 and 19.0 kN/m3, respectively.Estimate the undrained shear strength, preconsolidationpressure, and overconsolidation ratio at this depth.arrow_forward
- Plz give the correct answer. Compute the intensities of active and passive earth pressure at depth of 8 m in dry cohesionless sand with an angle of internal friction of 30 degrees , and unit weight of 18kN / (m ^ 3) What will be the intensities of active and passive pressure if the water level rises to the level? Take the saturated unit weight of sand as 22kN / (m ^ 3) .arrow_forwardUse 10 kN/m³ for the unit weight of water. Question 3 A project with excavation and construction stages will take place at your site (below which lies a saturated clay layer). On March 1, the effective stress at point A (in the middle of the clay layer) is 65 kPa, and the overconsolidation ratio is 1.3. On April 1, the effective stress at point A is 40 kPa. On May 1, the effective stress at point A is 60 kPa. What is the overconsolidation ratio on May 1?arrow_forwardI need the answer as soon as possiblearrow_forward
- Q1 The lower sand layer in the soil profile shown below is in an artesian condition. Calculate: 2 a) The effective stress () at the top and base of the clay layer. b) The height of water in the piezometer for = 0 at the base of the clay layer. > c) The maximum depth (Z) of the proposed excavation (Figure Q1 (b)). (Assume Z>2 m). 2.0 m 2.0 m 4.0 m Sand Tary' Ground water table Sand Clay Sand 4.0 m - 16.6 kN/m³ Ys20.6 kN/m³ You 20.6 kN/m² You 20.5 kN/m³ Figure Q1 (a) Sand Clay Sand Z Figure Q1 (b) W.T.arrow_forwardAnd the void ratio for each load increment is shown in the table below. σ₂ (kPa) Void ratio 15 1.66 30 1.65 60 1.64 120 1.52 2- Find Preconsolidation pressure (oc) and compression index (Cc). 240 1.38 480 1.25arrow_forwardQ2/ The load intensity applied by the footing (in the figure below)is 170 kN/m , determine the consolidation settlement for the following cases. (TW = 10 kN kN/m', o, = 64.35), divided the clay layer into three sub layers. m2 :1.0 m (1.5 x3.0) m Sand 1.5 m Y = 16.5 kN/m %3! Sand 1.5 m Ysat = 17.8 kN/m %3D Clay Ysat 18.2 kN/m e, = 0.92 Cc = 0.27 Cr 0.12 %3! 4.0 marrow_forward
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