Question 1) For a shallow foundation measuring (1.7 m x 2.2 m) as shown below: ,C. Estimate the primary consolidation settlement; when the bottom sandy layer is replacingwith a 5 m thickness of a clay layer. Noting that, the propertiės of the clay are the samefor the bottom sandy soil. Use yw=10 kN/m³qnet= 1.2 MN/m2G.S1.5 mSandYa=16 kN/m³ Ysat= 17 kN/m3%3D2.5 mN60=52V W.T.Silty Sand Yd=18 kN/m³ Ysat = 18.5 kN/m?N60=523.5 mSandYa=19 kN/m3Ysat = 22 kN/m³e, = 0.4, Ae=0.04 , o'= 194 kN/m25 mCc= 0.3, Cs= 0.2 , Ca= 0.05 N60=60CS Scanned with CamScanner

Answered: Image /qna-images/answer/b2614766-68c6-4adc-9ec0-fb27039f6937.jpg

C. Estimate the primary consolidation settlement; when the bottom sandy layer is replacing with a 5 m thickness of a clay layer. Noting that, the properties of the clay are the same for the bottom sandy soil. Use yw=10 kN/m³ qnet= 1.2 MN/m? G.S 1.5 m Sand Ya=16 kN/m3 Ysat = 17 kN/m³ 2.5 m N6o=52 VW.T. Silty Sand Ya=18 kN/m³ Ysat = 18.5 kN/m? N60=52 3.5 m Sand Ya=19 kN/m³ Ysat = 22 kN/m³ e. = 0.4 , Ae=0.04 , o'= 194 kN/m? 5 m Cc= 0.3, Cs= 0.2, Ca= 0.05 N60=60 Scanned with CamScanner

C. Estimate the primary consolidation settlement; when the bottom sandy layer is replacing with a 5 m thickness of a clay layer. Noting that, the properties of the clay are the same for the bottom sandy soil. Use yw=10 kN/m³ qnet= 1.2 MN/m? G.S 1.5 m Sand Ya=16 kN/m3 Ysat = 17 kN/m³ 2.5 m N6o=52 VW.T. Silty Sand Ya=18 kN/m³ Ysat = 18.5 kN/m? N60=52 3.5 m Sand Ya=19 kN/m³ Ysat = 22 kN/m³ e. = 0.4 , Ae=0.04 , o'= 194 kN/m? 5 m Cc= 0.3, Cs= 0.2, Ca= 0.05 N60=60 Scanned with CamScanner

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.8P

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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)
The figure below shows a proposed foundation site, with 10 ft of sand overlying 20 ft of clay with consolidation properties shown. The clay is normally consolidated. Assume 1-D conditions.a. Compute the initial σ′v at the middle of the clay layer prior to excavation and constructionb. After excavation and during construction, the foundation area will be heavily loaded with the structure and equipment so that σ′v at the middle of the clay layer will be increased to 3900 psf. Determine the settlement that will occur under these conditionsc. After construction is completed, the equipment will be removed and the final σ′v at the middle of the clay layer will be 3200 psf. Compute the swell that occurs after the equipment is removed
= Figure 2 shows a rectangular shallow foundation. The foundation measures 1.5 m x3 m (B x L) in plan. The clay layer is normally consolidated with: Ce=0.27; He 3 m; e 0.92; average effective stress on the clay layer due to applied foundation load Ao=24 kN/m². Determine the primary consolidation settlement of the foundation. Sand Y = 16.5 kN/m³ Sand Yat 17.8 kN/m³ Normally consolidated clay Ysat 18.2 kN/m³ = 0.92; C = 0.27 170 kN/m² 1m 1.5 m Ground water table --- --- 15 m 3 m
With the same load acting on the same size of foundation, calculate the settlement (in.) that will occur in the clay layer as shown below, using Factor of Safety of 1.5 Please use 2:1 method to find stress increase under a foundation Assume: OCR = 1 EL.+450 FT. Sand Y = 110 pcf EL. +445 FT. GWT: +442 FT. Y = 120 pcf %3D Clay eo = 0.3 Cc = 0.250 Cr = 0.025 EL. +435 FT. ROCK (Picture is not in scale)
8.4 A rectangular foundation is shown in Figure P8.2, given B= 2 m, L=4m q=240 kN/m², H=6m, and D; =2 m. (a) Assuming E = 3800KN/m², calculate the average elastic settlement. Use Eq. (8.24). (b) If the clay is normally consolidated, calculate the consolidation settlement. Use Eq. (8.35) and yat = 17.5 kN/m², C¸ = 0.12, and e, = 1.1.
Question 1) For a shallow foundation measuring (1.7 m × 2.2 m) as shown below: , A. Estimate the elastic settlement proposed by Mayerhof. Then, B. Estimate the elastic settlement proposed by Bowles, if the water table rises 1.5 m. Then, C. Estimate the primary consolidation settlement; when the bottom sandy layer is replacing with a 5 m thickness of a clay layer. Noting that, the properties of the clay are the same for the bottom sandy soil. Use Yw=10 kN/m³ qnet= 1.2 MN/m? G.S 1.5 m Sand Y=16 kN/m³ Ysat = 17 kN/m³ 2.5 m Neo=52 yW.T. Silty Sand Ya=18 kN/m² Ysat = 18.5 kN/m? Ngo=52 3.5 m Sand Ya=19 kN/m³ Ysat = 22 kN/m? e, = 0.4 , Ae=0.04 ,o'=194 kN/m² 5 m Cc= 0.3, Cs= 0.2, Ca= 0.05 Neo=60
Refer to Figure 5.12. For a rectangular foundation on layered sand, given:●● B = 4 ft, L = 6 ft, H = 2 ft, Df = 3 ft●● γ1 = 98 lb/ft3, Φ'1 = 30º, c'1 = 0●● γ2 = 108 lb/ft3, Φ'2 = 38º, c'2 = 0Using a factor of safety of 4, determine the gross allowable load the foundation can carry.
绘图编辑 3.12 For a strip foundation, the width is 1.2m, buried depth is 1.2m, the standard value of the load applied on the foundation F=155KN/m, the soil layer is distributed as follows: from the ground to the depth of 1.2m is the land fill, =18KN/m³; the depth in the range of 1.2~1.8m is silty clay, fak=155kPa, E,=8.1Mpa, y=19KN/m³; below the depth of 1.8m is the mucky clay, fak=102kPa, E,=2.7Mpa. Try to check the base pressure and the bearing capacity of the weak sub-layer. Ground F=155KN/m OLand fill 18KN/m³ 1.2m O Silty clay La-155kPa;E-8.1Mpa;y-19KN/m³ -0, 1.0 O Mucky clay -0, H1.0 Sak-102kPa;E,-2.7Mpa 1.2m
Q3. A mat foundation is shown in figure below. The design considerations are L 12 m, B -10 m, Df 2.2 m, Q = 30 MN, x1 =2 m, x2 2 m, x3 -5.2 m, and preconsolidation pressure oe = 180 kN/m?. Calculate the consolidation settlement: under the center of the mat. • Under the corner of the mat Size of mat = BXL Sand Dr y = 16.0 kN/m3 X1 Groundwater table Sand Yeat = 18.0 kN/m Clay = 17.5 kN/m3 EYsat e, = 0.88 C = 0.38 C; = 0.1
Two identical rigid foundations are given. Calculate the differential settlement ratio (8/L) after 100 days and long term after construction of the foundations. Hint: Average total final settlement of a rigid footing due to a clay layer can be found based on the following equation: Sy = 0.75 m, H dơ P = 600 kN P = 600 kN 15 m Foundation B 1.5 m x 1.5 m Foundation A 1.5 mx 1.5 m 0.8 m 0.8 m Sand 2 m 3.5 m = 18 kN/m E 20 MPa, v * 0.3 Clay 4.5 m Yeat = 19 kN/m2, m, = 0.2 m2/MN, C, = 107 m/s 3 m Highly permeable bedrock Not to Scale
Estimate the ultimate consolidation settlement under the centerline of a 25 x 25 meter mat foundation. The mat is 1.5 meter thick reinforced concrete (ϒconcrete = 23.6 kN / m3), and the average stress on the surface of the slab is 125 kPa. The soil profile is shown in the figure below. Lab testing on samples of the clay showed that the clay is normally consolidated and that Cc = 0.40, Cr = 0.03, and eo = 1.13. Neglect any settlements due to the sand layer. Divide the clay layer into four thinner layers of thickness 2.0, 2.0, 3.0, and 3.0 meters.
KINDLY GET THE REAL ANSWER WITH EXPLAIN STEP Given that B =1 m, L = 3 m, and Q = 110 kN, the soil characteristics given in the figure are Cs = 1/5 Cc, Ꝺ’c= 40 kN/m2. Field monitoring indicated that the foundation settlement was 19 mm during the first 12 months. Estimate the average stress increase in the clay layer due to the applied load. Estimate the primary consolidation settlement. What is the degree of consolidation after 12 months? Estimate the coefficient of consolidation for the pressure range. Estimate the settlement in 24 months.