A soil profile is shown in the following figure. A new footing will be placed on the ground and the average vertical stress increment at the midpoint of the clay layer due to the new footing will be Ao, = 25.5 kPa. Estimate the final primary consolidation settlement of the clay layer. Assume that the clay is normally consolidated. New footing 2.8 m Ydry 18.0 kN/m³ W.T. 4.2 m Ywet = 18.6 kN/m³ 3.0 m = Ywet 18.2 kN/m³, e₁= 0.82 LL = 44, PL = 20 Sand Sand Clay Sand

A soil profile is shown in the following figure. A new footing will be placed on the ground and the average vertical stress increment at the midpoint of the clay layer due to the new footing will be Ao, = 25.5 kPa. Estimate the final primary consolidation settlement of the clay layer. Assume that the clay is normally consolidated. New footing 2.8 m Ydry 18.0 kN/m³ W.T. 4.2 m Ywet = 18.6 kN/m³ 3.0 m = Ywet 18.2 kN/m³, e₁= 0.82 LL = 44, PL = 20 Sand Sand Clay Sand

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter17: Subsoil Exploration

Section: Chapter Questions

Problem 17.14P

See similar textbooks

Similar questions

A 5-ft fill is to be placed over the following soil profile shown below. Determine if the clay is normally consolidated or over-consolidated. The pre-consolidation pressure (past maximum consolidation stress) of the clay is 1000 lb/ft3. 5 ft 2 ft 4 ft Proposed Fill, y = 120 lb/ft³ Sand Clay Rock 2 ft A Ydry = 100 lb/ft³ Ground water table Ysat 110 lb/ft³ = o'= Pc = 1000 lb/ft²
Calculate the primary consolidation settlement of the 3 m thick clay layer (Figure below) that will result from the load carried by a 1.5 m square footing. The clay is normally consolidated. Dry sand Ydry = 15.7 kN/m³ 3 m 1.5 m 3m 1.5 m, 890 KN Footing size 1.5 mx 1.5 m Groundwater table Ysat = 18.9 kN/m³ Clay Ysat = 17.3 kN/m³ Co=1.0 LL=40
2) A rectangular (5ft by 8ft) foundation will be built on the soil profile shown in the figure. Calculate the primary consolidation settlement below the center of the foundation. Assume the clay layer shown in the figure is normally consolidated. For simplicity, do not subdivide the clay into multiple sublayers. AG = 1500 lb/ft? Dry sand *120 pet Clay,Ce =0.28 e,= 0.55 Ya 125 pct Bedrock (Impermeable)
11.12 A 2-m clay layer in the field has a current effective stress, oó= 70 kN/m?. There is a net stress increase, Ao = 180 kN/m², due to a foundation load. Calculate the expected primary consolidation settlement. The results of a consolidation test on the clay are given below. o' (kN/m) 0.98 12 0.94 50 0.82 200 0.73 400 ©Cngage lamng 2014
A square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Based on the bulbs of pressure developed below the footing shown in the following figure, which of the following statements are correct (select all that apply)? A.Immediately after construction, the excess pore water pressure (∆u) developed at Point A remains lower than ∆u developed at Point B B.Immediately after construction, the excess pore water pressures (∆u) developed at Points B and C are the same C.Since the clay layer is homogeneous, one-dimensional Terzaghi’s theory of consolidation can be applied to provide an accurate estimate of the rate of consolidation at Points A, B, and C. D.After construction, three-dimensional seepage occurs below the foundation as the excess pore water pressures dissipate.
Question-3: A soil profile is shown in Figure 3.1. If a uniformly distributed load, Ao-100 kPa, is applied at the ground surface, Solve for the settlement of the clay layer caused by primary consolidation, if Ce = 0.27 and C, = 0.045 [Note: Prepare e-log(o') curve for all part b, and c cases and locate all values on them] a. The clay is normally consolidated. Divide the 4m layer into two sublayers. b. The preconsolidation pressure, o'c = 190 kN/m², assume single layer c. The preconsolidation pressure, o'c = 170 kN/m², assume single layer. [CLO2] [CLO 2] [CLO 2] Ao 100 kN/m² A 2 m Sand Layer Ydry 14 kN/m³ Groundwater table Sand Layer 4 m Ysat 18 kN/m³ Ysat 19 kN/m3 Clay Layer Void ratio, e = 0.8 D Sand Layer 4 m Sand Clay Fig. 3.1 Soil Profile
Scenario The wall footing at right is to be constructed to carry an inclined load at 85 degrees with the horizontal, as shown. Assume that there is impenetrable bedrock below the Sample point shown in the figure. Question #1: Calculate the expected primary settlement of the soil at the Sample point. Also, determine the time it will take for 60% of the expected primary settlement to occur. 2.5 m 0.5 m 120 kN/m 2 m y = 17.7 kN/m³ • Sample Cc = 0.190 Cv = 0.5 cm²/day eo = 0.83 Silty clay Question #2: Determine the factor of safety against bearing failure of the soil for the wall footing if qult of the soil is 160 kN/m².
Calculate the primary consolidation settlement of the 3-m thick clay layer, shown in the figure, that will result from the load carried by a 1.5 m square footing. The clay is normally consolidated. Use 2:1 method for calculation of Δσ.
The soil for backfilling comes from a borrow pit. The water content of the soil in the borrow pit is 15% and its void ratio is 0.69. The swell index index is 1.2. The specification requires the backfill material to be compacted to a dry unit weight of 16 kN/m^3 1. What is the number of truckloads of soil required for the footing foundation? 2. What is the weight of dry soil in one truck load? 3. What is the weight of water per truck load? 4. What is the degree of saturation of the soil in situation Please answer. Thank you! Guide in answering is in the picture. Thanks!
The soil for backfilling comes from a borrow pit. The water content of the soil in the borrow pit is 15% and its void ratio is 0.69. The swell index index is 1.2. The specification requires the backfill material to be compacted to a dry unit weight of 16 kN/m^3 1. What is the number of truckloads of soil required for the footing foundation? 2. What is the weight of dry soil in one truck load? Please answer. Thank you! Guide in answering is in the picture. Thanks!
The square footing shown in the figure carries a load of 3500 kN. Assume that the stress below the footing is distributed at a slope of 1H:2V. The clay layer is overconsolidated with OCR -2 Q - 3500 kN 4mx Sm 0.6 m Ya - 17.5 kN/m Sand 0.6 m GWT Sand 1.2 m 7'= 8.49 kN/m Yrat = 17.1 kN/m Clay e, = 1.4 C, = 0.06 = 0.38 1.2 m etermine the settlement of the clay layer.
A 3 ft square footing carries a sustained load of 10.6kips. It is placed on the surface of a 30 ft thick saturated overconsolidated clay underlain by dense sand. Based on laboratory tests, the clay can be adequately modeled using the e-log-p method. The laboratory tests provide the following compressibility information for the clay: y = 123.4lb/ft³ Cc = 0.064 1+eo Cr 1+eo Aom = 920lb/ft² The groundwater table is located at the ground surface. Estimate the primary consolidation occurred in the clay layer. Solution: Preliminary Calculations: 1). It should be adequate to compute the compressibility to a depth of = 0.0024 2). Layer thickness = ft; 2). Bearing pressure at the bottom of the footing: q = Primary consolidation for each layer: a). Layer 1: 1). depth to layer midpoint = 2). Total vertical stress at midpoint: Oz ft; 3). Pore water pressure at midpoint: u = 4). Effective vertical stress at minpoint: Oz! 6). Induced vertial stress: Az = = = 9). The type of this layer of soil is :…