11. An embankment for a highway 30 m wide and 1.5 m thick is to be constructed from sandy soil, trucked in from a borrow pit. The water content of the sandy soil i the borrow pit is 15% and its void ratio is 0.69. Specifications require the embankment to compact to dry weight of 18 kN/m³. The length of the embankment is 1 km. a. What is the dry unit weight (in kN/m³) of sandy soil from the borrow pit to construct the embankment? Assume that Gs=2.7. b. What is the number of 10 m³ of truckloads of sandy soil required to construct the embankment? c. What is the weight (in kN) of water per truck load of sandy soil?

11. An embankment for a highway 30 m wide and 1.5 m thick is to be constructed from sandy soil, trucked in from a borrow pit. The water content of the sandy soil i the borrow pit is 15% and its void ratio is 0.69. Specifications require the embankment to compact to dry weight of 18 kN/m³. The length of the embankment is 1 km. a. What is the dry unit weight (in kN/m³) of sandy soil from the borrow pit to construct the embankment? Assume that Gs=2.7. b. What is the number of 10 m³ of truckloads of sandy soil required to construct the embankment? c. What is the weight (in kN) of water per truck load of sandy soil?

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter3: Weight–volume Relationships

Section: Chapter Questions

Problem 3.24P

See similar textbooks

Similar questions

An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is athick layer of stiff clay. It was decided that a circular embankment, 10 m diameter,with wick drains inserted into the soft clay would be constructed to preconsolidateit. The height of the embankment is 6 m and the unit weight of the soil comprisingthe embankment is 18 kN/m3. The following data are available: thickness of softclay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree ofconsolidation is 90% in 12 months. Determine the spacing of a square grid of thewick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s.The flow point distance is 4 m. Assume a half-closed system.
5. An embankment for a highway will be constructed from a soil. To construct the embankment, the total weight of the soil from the borrow pit is 500000 kN. The water content of the soil in the borrow area of 14% and the bulk unit weight is 16 kN/m³. The soil in the embankment will be compacted to a dry unit weight of 17.5 kN/m³. The specific gravity of the sandy soil is 2.67. (a) Determine the volume and weight of the soil in the embankment. (b) If the soil in the embankment becomes saturated after construction, what is the new water content of the soil?
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).
An earthdam has a crest width of 15 feet , total height of 40 feet and the inclinations at heel and at toe both at 45 degrees w.r.t. the horizontal. If the coefficient of permeability of the earthdam material is 0.00042 ft/min, determine the seepage rate in cubic feet/day/ft of dam. Height of water at upstream is 30 feet. Use Dupuit's method. O 3.8428 O.00277 O 3.5873 O.00267 |oooo
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
5. The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. Estimate the coefficient of permeability at a void ratio of 0.48. Using Casagandre equation Using Kozeny-Carman equation Find the difference in the rate of flow using the results of “a” and “b” if i = 0.70 and A = 0.6 m2.
An embankment for a highway 30 m wide and 1.5 m thick is to be constructed from sandy soil, trucked in from a borrow pit. The water content of the sandy soil in the borrow pit is 17% and its void ratio is 0.73. Specifications require the embankment to compact to dry unit weight of 17.5 kN/m3. The length of the embankment is 1 km. What is the weight (in kN) of water per truck load of sandy soil? Assume that Gs=2.76 and total volume of soil per truckload is 7 m³. O 23.5 kN O 18.6 kN O 25.0 kN O 16.5 kN
3.A half-closed clay layer is 8 m thick and it can be assumed that cv ¼ ch. Verticalsand drains 300 mm in diameter, spaced at 3 m centres in a square pattern, areto be used to increase the rate of consolidation of the clay under the increasedvertical stress due to the construction of an embankment. Without sand drainsthe degree of consolidation at the time the embankment is due to come into usehas been calculated as 25%. What degree of consolidation would be reachedwith the sand drains at the same time?
An embankment for a highway 30 m wide and 1.5 m thick is to be constructed from sandy soil, trucked in from a borrow pit. The water content of the sandy soil in the borrow pit is 15% and its void ratio is 0.69. Specifications require the embankment to compact to dry weight of 18 kN/m3. The length of the embankment is 1 km. What is the number of 10 m³ of truckloads of sandy soil required to construct the embankment? Assume that Gs=2.7. 617 O 1584 O 5169 O 8671
Qi/ A 5m deep deposit of silty sand lies above a 4m deep deposit of gravel. The gravel is under- lain by a deep layer of stiff clay. The ground water table is found 2m below the ground surlace. The Soil properties are :- of sand below GWT = 1.75 Mg/m³ Isat of gravel 2.05 Mg/m ³ Isat of sand above G.WT = 1.7 Mg/m²³ 2 Draw The distribution of vertical total stress, Pore water pressure, and vertical effective stress with depth down to the clay layer. P = 1.7 My/m²³- $t1 = 1.95 Mg/m³, silty sand Seat - 2.05 Mg/m²/ G.L G.WT I gravel still clay) 4m
4. An embankment for a highway will be constructed from a soil. The total volume of the embankment is 20,000 m³. The soil in the embankment will be compacted to a dry unit weight of 18 kN/m³. The sandy soil will be obtained from a borrow pit. The water content of the soil in the borrow area of 16% and the bulk unit weight is 17.5 kN/m³. The specific gravity of the sandy soil is 2.7. (a) Determine the volume and weight of the soil from the borrow pit required to construct the embankment. (b) If the soil in the embankment becomes saturated after construction, what is the new water content of the soil?
Situation 5: 12. 13. 14. 15. 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 of the sandy soil in the borrow pit is 17% and its void ratio is 0.75. The specification requires the embankment to be compacted to a dry unit weight of 19 kN/m³. The length of embankment is 3 km. Use G = 2.7. Compute the volume of borrow material required. Solve the total cost of fill if the earth fill from borrow site costs P200/m³ Calculate the volume of borrow material required if the specification requires a void ratio of 0.20. The moist unit weight of 0.00283 m³ of soil is 65 N. The water content is 13% and the specific gravity is 2.73. Solve the volume occupied by the water. The saturated unit weight and the water content in the field are found to be 18.55 kN/m³ and 33%, respectively. Determine the specific gravity of the soil solids.