(a)
Find the number of truckloads required to construct the fill.
(a)
Answer to Problem 3.21CTP
The number of truckloads required to construct the fill is
Explanation of Solution
Given information:
Borrow pit:
The water content of the undisturbed soil is
The unit weight of the undisturbed soil in the borrow pit is
The specific gravity of the undisturbed soil is
Loading truck:
The capacity of the truck is
The net weight of the soil and water when the truck is loaded with is
Compacted fill:
The dry unit weight of the compacted fill is
The finished volume of the compacted fill is
The moisture content of the fill is
Calculation:
Find the weight of the solids
Substitute 72.7 kN for W and 15% for
Find the weight of the solids in the compacted fill
Substitute
Find the number of truckloads required using the relation:
Substitute 666,050 kN for
Therefore, the number of truckloads required to construct the fill is
(b)
Find the volume of the pit that remains in the borrow area.
(b)
Answer to Problem 3.21CTP
The volume of the pit that remains in the borrow area is
Explanation of Solution
Given information:
Borrow pit:
The water content of the undisturbed soil is
The unit weight of the undisturbed soil in the borrow pit is
The specific gravity of the undisturbed soil is
Loading truck:
The capacity of the truck is
The net weight of the soil and water when the truck is loaded with is
Compacted fill:
The dry unit weight of the compacted fill is
The finished volume of the compacted fill is
The moisture content of the fill is
Calculation:
Find the weight of the soil
Substitute 666,050 kN for
Find the volume of the pit
Substitute 765,957.5 kN for
Therefore, the volume of the pit that remains in the borrow area is
(c)
Find the liters of water will have to be added per truck load.
(c)
Answer to Problem 3.21CTP
The liters of water will have to be added per truck load is
Explanation of Solution
Given information:
Borrow pit:
The water content of the undisturbed soil is
The unit weight of the undisturbed soil in the borrow pit is
The specific gravity of the undisturbed soil is
Loading truck:
The capacity of the truck is
The net weight of the soil and water when the truck is loaded with is
Compacted fill:
The dry unit weight of the compacted fill is
The finished volume of the compacted fill is
The moisture content of the fill is
Calculation:
Neglect the moisture lost by evaporation during excavation, haulage, and handling.
The moisture content increased from 15% to 18%.
Find the weight of the water
Substitute 63.2 kN for
Consider the unit weight of water as
Find the volume of water
Substitute 1.896 kN for
Therefore, the liters of water will have to be added per truck load is
(d)
Find the water content at saturation.
(d)
Answer to Problem 3.21CTP
The water content at saturation is
Explanation of Solution
Given information:
Borrow pit:
The water content of the undisturbed soil is
The unit weight of the undisturbed soil in the borrow pit is
The specific gravity of the undisturbed soil is
Loading truck:
The capacity of the truck is
The net weight of the soil and water when the truck is loaded with is
Compacted fill:
The dry unit weight of the compacted fill is
The finished volume of the compacted fill is
The moisture content of the fill is
Calculation:
Find the void ratio
Substitute
Find the water content (w) using the relation:
Substitute 1 for S, 0.531 for
Therefore, the water content at saturation is
Want to see more full solutions like this?
Chapter 3 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
- Two specimens of clay A and B are tested in a consolidated apparatus. If: (mv) A = 3.6 x 10-4 m²/kN (m₂) = 1.8 x 10-4 m²/kN B (C₂)A = 3.8 x 10-4 cm²/s (C₂) A = 1.9 x 10-4 cm²/s then the ratio KA / KB is equal toarrow_forwardQ2: Answer the following questions. 1- For the soil packing shown in the figure below, find the void ration of this soil Sphere Sphere Sphere Sphere 2- Discuss why illite clay is more stable than montmorillonite clay.arrow_forwardResults from liquid and plastic limit tests conducted on a soil are given below. Liquid limit tests: Number of blows, N Moisture content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Plastic limit tests: PL = 13.4% a. Draw the flow curve and obtain the liquid limit. b. What is the plasticity index of the soil? © Cengage Learning 2014arrow_forward
- From the following data, solve for the degree of compaction. If this is for Item 201, Aggregate Base Course, will it pass the specification? Field density test data: Weight of material taken from hole, kg. = Weight of sand to fill hole, kg. = 5.585 3.935 Volume of hole, cu.m = Wet unit weight, kg/cu.m = Dry unit weight, kg/cu.m = 0.0028 1995 1734 Laboratory Data: Maximum dry density, kg/cu.m. = 1750 Optimum Moisture Content, % = 8.00arrow_forwardQ1// A soil sample was taken from a pit and its total unit weight was equal to KN (17.17) and its water content was 12% and the specific gravity of m3 soil particles was (2.7) and then this pit was filled with compacted soil with a water content of 18% and the dry density is equal to (16.19 KN m3 Calculate the following for 1000 m³of fill soil? (yw: KN. = 9.81 m3 A)) The volume of soil to be extracted from the pit in cubic meters. B)) The weight of water that can be added to reach the new water content C)) The ratio of voids to the soil in the pitarrow_forwardSelect the best answer and show your solution 1. If a soil has specific yield of 5% ,how much water could be drained over an area Of 14,000 sq m if the water table drops 1.5 m a. 1050 cu m b. 1054 cu m 1052 cu m d. 1055 cu m c.arrow_forward
- For a given soil, derive the following relation by drawing the three-phase diagram: Given: Yt = Gs Yw (1 − n) (1 + w) W Yt = Gs Yw (1 − n) (1 + w) Required Derive the following Relationarrow_forward9- The bulk unit weight and water content of a soil at a borrow pit are 17.2 kN/ml and 8.2% respectively. A highway fill is being constructed using the soil from this borrow at a dry unit weight of 18.05 kN/m³ • Find the volume of the borrow pit that would make one cubic meter of the finished highway fill. Answer: 1.136 m3arrow_forwardIn constructing an earth dam 1600 m³ of earth are required. If the desired void ratio of the dam is 0.6, how many cubic meter will be removed from the borrow pit provided its void ratio is 1.1?arrow_forward
- a) 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_forwardA proposed earthen dam will contain 5,000,000 m3 of earth. Soil to be taken from a borrow pit will be compacted to a void ratio of 0.75. The void ratio of soil in the borrow pit is 1.15. Required: Estimate the volume of soil that must be excavated from the borrow pit, to the nearest whole number. Question 9' Listen Given: A soil sample has a degree of saturation of 50% and void ratio of 0.65. Required: Determine how much water must be added per cubic meter of soil to increase the degree of saturation to 100%? Answer in kN, to the nearest hundredth.arrow_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_forward
- Principles of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage LearningPrinciples of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781305081550Author:Braja M. DasPublisher:Cengage Learning