A 1.2 m height highway embankment oflarge lateral extent is to be placed overa surface clay deposit of 10 m thicknesswhich is underlain by sand as shown inthe figure below.A- Compute the ultimate settlementexpected under the embankment.Embankment of large extent (y = 16.1 KN/m')B- If the maximum tolerable settlementG.W.Tof the embankment surface pavement is3cm, when should the pavement beplaced after completion of embankmentplacement?C- What is the average excess poreClay= 18.1 KN/m"satР. 3 50 Кра , е, %3D1.01C. = 0.17, C, = 0.04C, = 13 m lyrwater pressure at the completion ofembankment placement?D- What is the total effective stress (atmid of clay layer) at the time of paving?Sand (Y = 18.1 KN/m)sat10m| 1.2 m

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Answered: 1.2 m height highway embankment of rge…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A developer plans to extend Bayview Haven residential estate in Darwin by constructing a 3.5mm fill platform over very soft mangrove silty clay soils. Borehole drilling indicates the very soft clay soils are 5m thick and underlain by rock of extremely low permeability, with the water table at the ground surface. Laboratory testing indicates the following geotechnical properties of the soils: • Very Soft Silty Clay: Degree of saturation - 100%, Coefficient of Volume Compressibility (m.) - 0.85 MPa', coefficient of consolidation of clay (c.) = 2.5 m/yr; dry unit weight - 13 kN/m', moisture content - 38%. Compacted fill: bulk unit weight = 22 kN/m'. (a) Estimate the final consolidation settlement (s.) of the clay layer AM (b) Estimate the consolidation settlement after 14.5 months (c) How long will it take the silty clay layer to reach 90% consolidation, in years. (d) If the silty clay has an overconsolidation ratio (OCR) of 1.5, what is the preconsolidation pressure at the midpoint of…
In a separate region of the new E-W highway proposed by the Maine DOT an 18 ft. highway embankment will be constructed and overly a 10 ft thick layer of soft clay. The embankment will be compacted with an undrained strength of 800 psf and the soft clay has a measured strength of 450 psf. The DOT would like to maintain a factor of safety of at least 1.5. a. Draw the critical failure service and compute the factor of safety using the Swedish method and solution charts from DM7.1 (handouts in class) H= 18 ft Soft Clay Su = 450 psf 7 = 120 pcf Hard, competent material N.T.S Roadway Clay Fill Su = 800 psf 7 = 120 pcf D = 10 ft
a dry density of 17 kN m3 will A borrow pit soil has How many cubic meters of this soil be required to construct an embankment of 120 m³ volume with a dry density of 16 KN/m3.
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.
Soil k (mm/s) 0.10 300 тm B 0.03 0.0049 a.Compute the equivalent k in cm/s. A C b.Compute the rate of flow in cm³ /hr. 15 cm15 cm15 cm» Given: Cross-sectional area of the soils A, B and C is 100 mm x 100 mm
Soil Settlement Situation 3. See figure GEOD 23.0. The soil is acted upon by a uniformly distributed lload of 60 kPaat the ground surface. > Compute the settlement of the clay layer caused by primaryconsolidation if the soil is normally consolidated. > > Compute the settlement of the clay layer caused by primaryconsolidation pressure of clay is 230 kPa. o Use Cs=cc/5. Compute the settlement of the clay layer caused by primary consolidation if the pre-consolidation pressure of clay is 200 kPa. Use cs=cc/5. 4 m 8 m II Sand Sand 6 m Clay eu/w 60 kPa Ydry = 16.5 kN/m^3 VGWT Ysat 18.0 kN/m^3 Ysat 20.0 kN/m^3 e = 0.85 LL = 48% Fig. GEOD 23.0
A soil profile consists of 3m of clean sand (γ=18kN/m³) over 10m of silt (γ=17kN/m³, kv=1 x 10-8m/s) over 12m of clay (γ=17kN/m³, kv=4 x 10-9m/s) over gravel. Piezometers installed at middepth of the sult later and at the top of the gravel layer measure, respectively, piezometric heads of 4m and 3m. Assuming one-dimensional flow in the vertical direction, compute the flow rate in m³/year/10,000m². Also, compute at 16m below the ground surface the total veritcal stress, effective stress, and porewater pressure.
What is the area of cut in square metre? what is the average cut in metres? what is the volume of cut in cubic metres? what is the area of the fill in metre square? what is the average fill? what is volume of full in cubic metres? QUESTION 3. Determine the fill and cut volumes of the 10 m by 10 m grid below. A B 0.7 F 0.7 C 0.8 F 0.8 C 2 1 2
A road section is 600 m long (20 Stations). The cut and fill volumes are to be computed between each station. The table below lists the station numbers, the end area values (m:) between each station that are in cut (column 2) and that are in fill (column 3). Material in a fill section will consolidate (known shrinkage), and for this road section, is 10 as percent. Determine the accumulated volumes? End Area (m?) 1 Station 3 Cut Fill 3 18 2 50 2 97 4 130 8 51 40 45 45 20 80 122 2 6. 130 10 140 11 100 12 80 30 13 75 20 14 50 50 15 20 80 16 10 100 17 120 18 120 19 40 50 20 30 30 012345678
Refer to Figure 2. Embankments are generally constructed in several layers that are compacted according to geotechnical specifications.layers that are compacted according to geotechnical specifications. The thickness of eachof each layer is 3ft and should have a dry unit weight of 118 lb/ft3 .. It is known that theThe soil used in the embankment has a wet unit weight of 111 lb/ft3, moisture contentmoisture content of 23%, and Gs = 2.67. Complete the following tasks:(a) Determine the wet weight of the soil required to construct the first layer.(closest to the foundation soil) per foot (ft) of the embankment.b) On the day of construction there was a heavy rain that caused the soil used to reach a nearly saturated condition.used to reach a near saturated condition. Recalculate the wet weightwet weight of soil required to construct the first layer.
An earth embankment requires 2000 m of soil for construction at a target dry density of 17 kN/m. Quotations from three different vendors are shown in the table below along with their distances from site. Assume cost of transportation = 10 per km, G= 2.7 and y = 10 kN/m³. %3D S.No. Vendor Name Void ratio of soil Rate (/m') Distance from site 1. A 0.6 6.0 99.5 km 2. B 0.7 5.5 131 km 3. C 0.8 5.0 175 km Which vendor would you choose as the most economic solution? (a) Vendor A (c) Vendor C (b) Vendor B (d) Any of these

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