Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.3P
To determine
Find the height at which the concrete cube should be raised and dropped for densifying the granular soil of 10-m depth.
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As shown in the figure given below, a 5 m thick layer of silty sand overlies a clay layer 3 m in
thickness. Below the clay layer, there lies a 4 m thick gravelly sand layer underlain by pervious
bedrock. The ground water table is at the ground surface.
GWT
Silty Sand
5 m
Ya = 18 kN/m³
Ys = 19 kN/m3
Clay
1.5 m
3 m
Ys = 18 kN/m3
x A
Gravelly Sand
Ys = 20 kN/m3
2 m
4 m
x B
WXXX
a) Calculate the total stress (0), pore water pressure (u) and effective stress (o') at points "A"
and “B". Show your work and tabulate the results in the following form.
Point A
Point B
o (kPa)
u (kPa)
o' (kPa)
b) If ground water table is lowered by 2 m for foundation excavation purposes, calculate the
total stress, pore water pressure and effective stress at points "A" and "B" (i) immediately after,
(ii) long time after lowering the water table. Show your work and tabulate the results in the
following form.
The soil profile shown in the figure consist of a 9m layer of sand underlain by a 6m layer of clay. The location of water table is 3m from the ground level. The building to be constructed will cause an additional an additional pressure of 60 kPa on the ground. What is the primary settlement of the clay layer if:
a. Clay is normally consolidated
b. Preconsolidated pressure Pc=200 kPa
c. Preconsolidated pressure Pc= 160 kPa
Please help me with homework help. I’m struggling and can’t find how to resolve this. Show all work so i may learn! Thank you!
Chapter 11 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- A structure is built on a normally consolidated clay of thickness of H(m), where H is the last digit of your student identity number (SID). If the last digit of your SID is zero, take H = 10m. The normally consolidated clay has a natural moisture content of 45% and a Liquid limit of 50%. Ground investigation results show that the clay is overlain by a 15m layer of sand, and the ground water table is at 10m below ground level. The submerged unit weight and bulk unit weight of the sand layer are 15 kN/m³ and 20 kN/m³ respectively. The vertical stress increase at the centre of the clay layer is 100kPa due to the weight of the structure. Calculate the settlement of the structure due to primary consolidation. Take G =2.7.arrow_forwardI need help on this soil problem.Thank You Calculate the permeability, K, for Bay mud after solving the following equation (gw is the specific weight of water and mv is the volume compression coefficient, which is about 0.001 1/kPa for Bay mud). Keep track of unitsarrow_forwardX1arrow_forward
- A container of volume 3 × 10-³ m³ weighs 10 N. Dry sand was poured to fill the container. The container and the sand together weighs 53 N. The porosity of the soil will be (Take G₂ = 2.7, Y = 9.81 kNm/³)arrow_forwardSITUATION 4: As soil profile shown below. The sand above the ground water table is dry. Other data pertaining to the table as follows: H₁ 4m, H₂= 3.2m, H₂ = 1marrow_forwarda) What are the typical permeability values for clay and sand, respectively? Discuss how the pore pressure in these soils would respond to loading, make use of schematic drawings when needed. b) A sample of silty clay is compacted into a mould 150 mm in diameter and 120 mm high. The mass of soil is 3.527 kg which reduces to 2.594 kg after drying in an oven. Calculate the bulk unit weight of the soil sample. Assuming the specific gravity of the soil grains, Gs = 2.72, calculate the degree of saturation and voids ratio of the soll. c) A site investigation is carried out in Northampton Square for a proposed five storey building. The ground is found to comprise 2 m of coarse gravel overlying London Clay. The gravel has a Gs = 2.65 and a specific volume of 1.573. The clay has a bulk unit weight = 17.9 kN/m³ and a coefficient of earth pressure, Ko= 1.1. The water table is at a depth of 2 m below the ground surface (i.e. level with the top of the London Clay strata). Calculate the vertical…arrow_forward
- I need the answer quicklyarrow_forwardin an earthen embankment under construction the bulk unit weight is 16.5 kN/m³ at water content of 11%. If the water content is to be raised to 15%, compute the quantity of water required to be added per cubic meter of soil? Assume no change in the void ratio.arrow_forwardUrgent need the solution. Kindly answer everthing. Please skip if you're not going to answer them. Thank you.arrow_forward
- Solve the following problems. Provide complete solutions and summary of answers. A 4-meter-thick sand overlies a thick layer of clay. The water table is 1.80 meters below the sand surface. The sand has a porosity of 34.64% and a degree of saturation is limited to 36.0% above the water table. The clay has a moisture content of 45.0% and the specific gravity of both sand and clay is 2.68. a. Total Stress at a point 12.0 meters below the sand surface. b. Total Effective Stress at a point 12.0 meters below the sand surface.arrow_forwardNote: Given all questions are subbarts.. Kindly give me all right solutions with clear calculations. Thank youarrow_forwardThe total density of sand in an embankment was found to be 1900kg/m^3 and the field water content was 12% . In the laboratory, the density of the solid was found to be 2660 kg.m^3, and the maximum and minimum voids ratio were 0.63 and 0.44, respectively What is the void ratio of the sand? Calculate the relative density of the sand in the field:arrow_forward
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