A proposed embankment till requires 50X0 m'of conmpacted soil. The void ratio of the compacted till is specified as 0.7. Four borrow pits are available as described in the follwing table, which lists the respective void ratios of the soil and the cost per cubic meter for moving the soil to the proposed con- struction site. Make the necessary calculations to select the pit from which the soil should be bought to minimmize the cost. Assume G, to be thc same at all pits. Borrow pit Void ratio Cost (S/m') O0.8.5 53 1.2 0.95 0,75

GEOTECHNICAL ENGINEERING: The Undisturbed soil at a given borrow pit is found to have the following parameters. The water content is 15%, the void ratio is 0.60 and the specific gravity of the solids is 2.70. The soil from this borrow pit is to be used to construct a rolled fill having a finished volume of 50,000 yd3 . The soil is excavated by means of a shovel and dumped on trucks. When loaded to capacity these trucks are found to contain, on average, a net weight of wet soil equal to 13,000 lbs. In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed by means of dicers (or other similar equipment) and then compacted until the dry unit weight γd=110 lbs/ft3. Helpful Conversions (3ft=1yd), (γw=62.4 lbs/ft3), (7.48gal/1ft3 ) a) If the fill should become saturated at some time subsequent to construction and does not change…

The soil in a borrow pit is at water content of 8.8% and bulk unit weight of 17.8 kN/m3. This soil is used in theconstruction of a compacted road base where the dry unit weight is 19.4 kN/m3 and the water content is 15%. Ifthe finished volume of the road base is 120,000 m3, (a) what would be the volume of the soil removed from theborrow pit? (b) How much water would be added to the soil from the borrow pit?

A fill having a volume of 15000 m³ is to be constructed at a void ratio of 0.5. The borrow pit solid has a void ratio of 1.5. The volume of soil required (in cubic meters) to be excavated from the borrow pit will be:

4.16 Plot the particle size distribution curve for each of the three soils the data for which are given below. All three curves should be on the same semi logarithmic diagram. Sieve Number 3/4 in ½ in #4 # 10 # 20 # 40 # 60 # 100 # 200 Particle Diameter from Hydrometer Analysis (mm) Lagoon Clay Beufort, SC 0.045 0.010 0.005 0.001 Data from Sowers (1979). 100 100 100 100 100 100 100 95 80 61 42 37 27 % Passing by Weight Beach Sand Daytona Beach, FL 100 100 100 100 100 98 90 10 2 Weathered Tuff Central America 100 98 95 93 88 82 75 72 68 66 33 21 10 4.17 Determine Cu and Ce for each of the three soils in Problem 4.17. Which of these soils is most well-graded? Why?

Embankment is to be built with 15 km length of proposed road with 2 m height of road embankment. The cross sectional area of embankment and distance of borrow pit from embankment are 30 m² and 10 km respectively. Soil is to be compacted to 97 % of the max dry density. Information given as follows: (a) Results from laboratory compaction test: Max dry density-1.80 Mg/m³ Optimum water content=12% (b) Borrow material: Dry density-1.70 Mg/m² Water content-8% Calculate volume of additional water required for the entire volume of the embankment Final answer should be = 27, 486 m³

The soil at a borrow area is at moisture content of 8.5%and unit weight of 17.5 kN/m3. This soil is used in the construction of a compacted road base where the dry unitweight is 19.5 kN/m3 and the moisture content is 14.0%. Ifthe finished volume of the road base is 120,000 m3, whatwould be the volume of the soil removed from the borrowpit? How much water would be added to the soil from theborrow pit?

Refer to Figure 2, estimate the primary consolidation settlement in the clay layer. Given: Ag = 85 kN/m²; Hi = 2 m; H2 = 4 m; and H3= 6 m. Soil characteristics are as follows: Sand: ydx 14 kN/m³, Ysat 18 kN/m³ Clay: LL = 54; e = 0.98; Ysat 19 kN/m'; Cs =- Cc 150 kN/m? H3 Sand Clay ョ→

Box 2.12 Calculating settlement. Worked example A large landfill is planned on 10 m of normally consoli- midpoint can be taken as representative of the whole dated clays with an underlying rock stratum. The water table is at ground surface. Clay samples extracted from the stratum at an intermediate point at a depth of 5 m provide the following soil properties: saturated unit weight, Kat = 20 kN/m3, void ratio, e, = 0.8, and compression index, ç = 0.15. Determine the settlement of the clay layer if stratum: Final void ratio: a+ Aơ ep -e =c log 50+ 80 the increase in vertical stress due to the landfill load is = 0.8 -e =0.15 log- 50 = e- 0.74 Aơ = 80 kPa. Vertical unit strain: Solution: eo - er Ho 1+eo 0.8-0.74 The hypothesis of uniform loading over an infinite lateral extent, allows one-dimensional conditions to be assumed. The figure shows the effective stress distribution corre- sponding to the initial and final situations (unit weight of water is , = 10 kN/m³). Taking that the…

Problem 2.1: The following values for a sand are given: D10 = 0.3 mm, D30 = 0.41 mm, and D60 = 0.77 mm.Determine Cu and Cc, and state if it is a well-graded or a poorly-graded soil.