A cut is to be made in a soil for a canal having side slopes of 11/2: 1 to a depth of 8 m below the ground surface. The soil has cohesion of 15 kN/m², p' = 10°, void ratio of 0.86 and specific gravity of 2.67. If the Taylor's stability number is 0.17 and canal flows full then the factor of safety is
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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).A canal having side slopes 1:1 is proposed to be constructed in a cohesive soil to a depth of 10m below the ground surface. The soil properties are ϕu = 15⁰, Cu = 12 kPa, e = 1.00, Gs = 2.65. If Taylors stability number, Sn = 0.08 and if the canal flows full, the factor of safety with respect to cohesion failure against the failure of canal bank slopes will be most nearly equal to?A canal having side slopes 1: 1 is proposed to be constructed in a cohesive soil to a depth of 10 m below the ground surface. The soil properties are : 4, =15°, c, = 12 kPa , e =1.0, G, = 2.65. If there is a sudden drawdown of water in the canal and if Taylor's stability number for the reduced value of o, is 0.126, the factor of safety with respect to cohesion against the failure of bank slopes will be
- (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.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.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
- 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) 4mA 4 m high embankment with a top width of 5 m and side slopes of 1:1, has to be constructed by compacting soil from a nearby borrow pit. The unit weight and natural moisture content of the soil are 1.8 tons/m3 and 8% respectively. Determine the quantity of water to be added to it for every kilometer of finished embankment, if the required dry density and moisture content of the embankment soil be 1.82 g/cm3 and 18%. Given G= 2.70. a.2,248 b.6,552 c.39,304 d.30,504A 4 m high embankment with a top width of 5 m and side slopes of 1:1, has to be constructed by compacting soil from a nearby borrow pit. The unit weight and natural moisture content of the soil are 1.8 tons/m3 and 8% respectively. Determine the volume of earth in m3 to be excavated from the borrow for every kilometer of finished embankment, if the required dry density and moisture content of the embankment soil be 1.82 g/cm3 and 18%. Given G= 2.70 O a. 2,248 O b. 6,552 O c. 39,304 O d. 30,504
- A layer of fine sand exists over a stratum of impervious rock. The sand layer is 6.25m thick. The site is flooded and the water surface is 1.25m above the surface of the sand. It is proposed to excavate a very wide ditch through the site and to remove sand to a depth of 2.5m below the existing surface of the sand. One side of the excavation is to be supported by sheet piling driven to a depth of 4.4m below the existing surface of the sand. Draw a flow net and determine the seepage in m³/min per m length for the sand with a permeability of 0.18m/sec.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?Problem-7 A canal is proposed to be made in a soil having cohesion of 30 kN/m², Q' = 0 and void ratio of 0.86 and specific gravity of 2.67. If there is a sudden drawdown of water in the canal then find the maximum depth (in m) for cutting of side slope of 1:1. The factor of safety is to be 1.5. Take stability number = 0.119.