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 3, Problem 3.24P
(a)
To determine
Calculate the moist weight of borrow soil needed to construct the first lift per ft of the embankment.
(b)
To determine
Calculate the moist weight of borrow soil needed to construct the first lift after heavy rain.
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An embankment will be constructed from borrowed
Soil. The cross section of the embankment is shown
in Exhibit 10.10. The soil in the embankment has to
be compacted to a dry unit weight of 108 lb/ft³ at
a moisture content of 14.5%. The borrowed soil will
be brought in 10 cubic-yard truck loads. The borrowed
Soil has a void ratio of 1.1. Given: specific gravity
Of Soil Solids, Gs=2.68. The volume of excavation
needed at the borrow site for construction of each
100' length of embankment is most nearly:
1
a) 4144 yd ³
b) 5260 yd3
c) 3550 yd3
d) 4890 yd³
25ft
15ft
Exhibit 10.10
An embankment for a highway 30 m wide and 1.3 m in compacted thickness is to be constructed from a sandy soil trucked from a borrow pit. The water content, w, of the sandy soil in the borrow pit is 17% and its void ratio, e, is 0.75. The specification requires the embankment be compacted to a dry unit weight of 19 kN/m^3. Determine, for 3 km length of embankment. Assume Gs = 2.7
a) Compute the volume (m³) of borrow material required
b) solve the cost of fill if the earth fill from borrow site costs Pho 150/m³
c) calculate the volume (m³) of borrow material required is the specification required a void ratio of 0.20
Solve with complete solutions and explain.
An embankment for a highway 30 m wide and 1.5 m in compacted thickness is to be constructed from a sandy soil trucked from a borrow pit. The water content of the sandy soil in the borrow pit is 15% and its void ratio is 0.69. The swell index is 1.2. The specification requires the em-bankment to be compacted to a dry unit weight of 18 kN/m3. Determine, for a 1 km stretch of embankment, the weight of sandy soil from the borrow pit required to construct the embankment, the number of truckloads of sandy soil required for the construction. The full capacity of each truck is 22.2 m3 and local government policies require a maximum loaded capacity of 90%, the weight of water per truckload of sandy soil and the degree of satu-ration of the sandy soil in situ.
Chapter 3 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - For a given sandy soil, emax = 0.75 and emin =...Ch. 3 - For a given sandy soil, the maximum and minimum...Ch. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.1CTPCh. 3 - Prob. 3.2CTPCh. 3 - Prob. 3.3CTP
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- Ql- An embankment is to be constructed over a layer of soft clay 16 m thick as shown in figure 1. Construction the embankment will increase the total vertical stress in the clay layer by 110 kPa. The design requirement is that all but 25 mm of the settlement due to consolidation of the clay layer will have taken place after 6 months. Determine: A. The spacing in best pattern of 500 mm diameter sand drains to achieve the above requirement. B. Which is the best, the use of sand drains or pre-fabricated drains? Why? (25%) Embankment Clay Cy = 4.7 m2/ year Ch = 7.9 m2/ year mv= 0.25 m2/ MN 16 m Sand Figure (1).arrow_forwardAn embankment for a highway is to be constructed from a soil compacted to a dry unit weight of 18kN/m3. The clay has to be trucked to the site from a borrow pit. The bulk unit weight of the soil in the borrow pit is 17kN/m3 and its natural water content is 12.3%. Calculate the volume of clay from the borrow pit required for 1m3 of embankment. Assume G=2.7.arrow_forwardAn embankment for a highway 30 m wide and 1.5 m in compacted thickness is to be constructed from sandy soil trucked from a borrow pit. The water content of the sandy soil in a borrow pit is 15% and its void ratio is 0.69. The swell index is 1.2. The specification requires the embankment to be compacted to a dry unit weight of 18kN/m^3. Determine, for a 1-km length of embankment, the following;(d) Volume of the borrow pit material required considering swell. (e) The number of truckloads of sandy soil required for the construction. The full capacity of each truck is 22.2m3, and local government regulations require a maximum capacity of 90%. (f) The weight of dry soil in one truckload.arrow_forward
- An embankment for a highway 30 m wide and 1.5 m in compacted thickness is to be constructed from sandy soil trucked from a borrow pit. The water content of the sandy soil in a borrow pit is 15% and its void ratio is 0.69. The swell index is 1.2. The specification requires the embankment to be compacted to a dry unit weight of 18kN/m^3. Determine, for a 1-km length of embankment, the ff; (g) The weight of water per truckload of sandy soil. (h) The degree of saturation of the sandy soil in situ. The dry density of sand with a porosity of 0.387 is 1600 kg/m3. Find the following; (i) The void ratio of the soil. (j) The specific gravity of the soil solids.arrow_forward2.1.Q.1: Determine the total vertical stress, pore water pressure, and the effective stress of the soil mass at the Centre of the clay layer and at the Centre of the sand layer for the conditions stated below when an embankment is to be constructed from a fill on ground surface. For more details, please find excel sheet Note: Clay layer follows sand layer a) Before the construction of the embankment. b) Immediately after the construction of the embankment. c) When ground water table lies at surface of ground level and below the foundation and discuss the change in the stresses values if any. Given data: Depth of Clay layer= 5 Depth of Sand layer= 5 Saturated unit weight of clay kN/m³ = 17 Saturated unit weight of sand kN/m³ = 18 Height of Embankment= 4 Unit weight of Embankment kN/m³= 17arrow_forwardAn embankment for a highway 30 m wide and 1.5 m in compacted thickness is to be constructed from sandy soil trucked from a borrow pit. The water content of the sandy soil in a borrow pit is 15% and its void ratio is 0.69. The swell index is 1.2. The specification requires the embankment to be compacted to a dry unit weight of 18kN/m^3. Determine, for a 1-km length of embankment, the ff;(d) Volume of the borrow pit material required considering swell. (e) The number of truckloads of sandy soil required for the construction. The full capacity of each truck is 22.2m3, and local government regulations require a maximum capacity of 90%. (f) The weight of dry soil in one truckload.arrow_forward
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- An embankment has a mass density of 1900 kg/m3. Laboratory test shows that the soil has a dry density of 1550 kg/m3 and the void ratio at its loosest and densest states were 0.85 and 0.42, respectively. The specific gravity of soil particles is 2.66. a. Determine the relative density of the embankment. b. Determine the moisture content of the embankment.arrow_forward(b) An earth embankment is to be constructed. The soil is to be compacted at maximum dry density of 18 kN/m³ at optimum moisture content = 15%. The in-situ bulk density and water content in borrow pit are 17 kN/m³ and 8% respectively. How much excavation should be carried out in the borrow pit for each cubic meter of embankment? Assume: G = 2.7; Y, 10 kN/m³.arrow_forwardSubject Geotechnical engineering : soil mechanics A layer soil shown has the following data H1= 3m. K1= 2x10^-2 cm/sec H2= 4m K2= 3.2x10^-2 cm/sec H3= 6m K3= 4.1 x 10^ -2 cm/sec Compute the equivalent coefficient of permeability in vertical direction. Compute the velocity if h= 4marrow_forward
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