At a reclamation site for which the soil strata isshown in figure, a 3 m thick layer of a fill materialis to be laid instantaneously on the top surface.If the coefficient of volume compressibility m, forclay is 2.2 x 10-4 m2/kN, the consolidationsettlement of the clay layer due to placing of fillmaterial will beL3 m| Fill material Yeat = 21 kN/mGWT4 mSilty sand Ysat = 20 kN/m%3DYsat = 18 kN/m?10 m Claym, = 22 x 10 m/kNSandy Gravel

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Engineering

Civil Engineering

settlement of the clay layer due to placing of fill material will be

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter16: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 16.8P

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A soil strata can be described as 6 meters of sand underlain by 4 meters of clay withthe water table located 7 meters from the bottom of said strata. The sand has a dry andsaturated unit weight of 14 kN/m3and 18 kN/m3 resp. On the other hand, pertinent clayproperties are saturated unit weight of 19 kN/m3 , void ratio of 0.8 and liquid limit of 40.Compute the primary consolidation settlement considering the following conditions if auniform load of 100 kPa is acting on the soil. If necessary, assume a logical value of Cs.A. The clay is normally consolidated.B. The pre-consolidation pressure is 190 kN/m2C. The pre-consolidation pressure is 170 kN/m2.
Given: rw = 0.25 m, rs = 0.35 m, de =4.5 m, cv 5 cvr = 0.3 m2/month, kh/ks 5 2, and Hc = 9 m. Determine: The degree of consolidation for the clay layer causedonly by the sand drains after six months of surchargeapplication
Refer to Figure below. Estimate the primary consolidation settlement in the clay layer. Given: Δσ = 150 kN/m2; H1 = 3 m; H2 = 4 m; and H3= 5 m. Soil characteristics are as follows: • Sand: γdry = 15 kN/m3, γsat = 19 kN/m3 • Clay: LL = 65; e = 0.65; γsat = 18 kN/m3; ; Cs =1/6cc σʹc = 200 kN/m2
A clay layer in the field is 4.6 m and is drained at the top only. Under a given surcharge, the estimated max consolidation settlements 310 mm. What is the average degree of consolidation for the clay layer when the settlement is 76 mm? A.) 24.5% B.) 35.38% C.) 18.72% D.) 29.65% Pls answer asap
a. Calculate the degree of consolidation of a 6 m thick double drained clay layer after 4862 days since initial loading. The coefficient of consolidation is 1.06 X 10-6 m2/min. b. For the same clay layer, how much time would it take to reach 30% consolidation, if drainage existed on only one boundary?
A soil strata can be described as 6 metersof sandunderlain by 4 meters of clay with the water table located 7 metersfrom the bottom of said strata. The sand has a dry and saturated unit weight of 14 kN/m3and18 kN/m3resp. On the other hand, pertinent clay properties are saturated unit weight of 19 kN/m3 , void ratio of 0.8 and liquid limit of 40. Compute the primary consolidation settlement considering the following conditions if a uniform load of 100 kPa is acting on the soil. If necessary, assume a logical value of Cs. A. The clay is normally consolidated. B. The pre-consolidation pressure is 190 kN/m2 C. The pre-consolidation pressure is 170 kN/m2.
Refer to Figure Q3. Estimate the primary consolidation settlement in the clay layer. Given: Δ? = 85 ??/?2 ?1 = 2 ? ?2 = 4 ? ?3 = 6 ?. Soil characteristics are as follows (use appropriate relations):• Sand: ? = 0.65; ?? = 2.66• Clay: ?? = 54;? = 0.98; ?? = 2.74; ?'c = 150 ??/?2; ?? = 1/6 ?c
A site has 20 m of saturated clay (saturated density = 1.6 Mg/m3) over hard bedrock. The settlement analysis for the clay under a new structure forecast that the ultimate consolidation settlement will be about 0.2 m. After 9 months, 0.1 m of settlement has occurred. a) What will be the consolidation settlement after 3 years ( 1 yr = 365 days)? b) Estimate the time it will take for the ultimate consolidation settlement of 0.15m to occur? (Use T95 for your estimate) Provide your answer in years.
Refer to Figure 7.28. For the construction of an airport, a large fill operationis required. For the work, the average permanent load, (p), on the claylayer will increase by about 70 kN/m2. The average effective overburdenpressure on the clay layer before the fill operation is 95 kN/m2. For the claylayer, which is normally consolidated and drained at top and bottom, H = 5 m, Cc = 0.24, e0 = 0.81, and cv = 0.44 m2/mo.a. Determine the primary consolidation settlement of the clay layer causedby the additional permanent load, (p).b. What is the time required for 90% of primary consolidation settlementunder the additional permanent load only?c. What temporary surcharge, (f), will be required to eliminate the entireprimary consolidation settlement in 6 months by the precompressiontechnique?
Estimate the primary consolidation settlement in the claylayer. Given: Δσ = 100 kN/m2; H1 = 4.0 m; H2 =5.5 m; and H3 = 9.5m. Soil characteristics are as Sand, e = 0.60; Gs = 2.55 Clay, LL = 60; e = 0.85; Gs = 2.65; σ'c = 200 kN/m2, Cs = 0.2 Cc Is there any difference if σ'c = zero
A 3-m thick layer of saturated clay (two-way drainage) under a surcharge loadingunderwent 90% primary consolidation in 100 days. The laboratory test’s specimenwill have two-way drainage.a. Find the coefficient of consolidation of clay for the pressure range. b. For a 25 mm. thick undisturbed clay specimen, how long will it take to under-go 80% consolidation in the laboratory for a similar pressure range?
The uniformly distributed load on theground surface is Δσ. Estimate the primary consolidation settlement of theclay layer given these values:H1 1.5 m, H2 2 m, H3 2 mSand: e 0.55, Gs 2.67Clay: e 1.1, Gs 2.73, LL 45Δσ= 120 kN/m2