Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Question
Chapter 17, Problem 17.5P
To determine
Find the factor of safety with respect to sliding and overturning of the gravity retaining wall.
Check the design for eccentricity.
Determine the soil pressures at the toe and the heel.
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Refer to Figure 12.3a. Given: H = 12 ft, q = 0, γ = 108 lb/ft3, c' = 0, and Φ' = 30º. Determine the at-rest lateral earth force per foot length of the wall. Also, find the location of the resultant. Use Eq. (12.4) and OCR = 2.
A concrete retaining wall 8 m high is supporting a horizontal backfill having a dry unit weight of 16.25kN/m3. The cohesionless soil has an angle of internal friction of 33 degrees and a void ratio 0f 0.65. (Use four decimal places)
A. Compute the rankine active force on the wall.
B. Compute the rankine active force on the wall if water logging occurs at a depth of 3.5 from the ground surface.
C. Compute the location of the resultant active force from the bottom.
For the dam retaining water as shown, find (A) the factor of safety against sliding if µ=0.48,
(B) the factor of safety against overturning and (C) the stress intensity at the base of the
dam. The foundation soil is permeable; assume hydrostatic uplift varies from full
hydrostatic head at the heel of the dam to zero at the toe. Use unit weight of concrete
equal to 23.5kN/m?.
3 m
4 m
8 m
3 m
to
W.S
12 m
14 m
3 m
3 m
O O
Chapter 17 Solutions
Principles of Foundation Engineering
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- ANSWER SHOULD BE ANSWER KEY: 43) 14.2 MPa 44) 90 mm 45) 0.33 MPaarrow_forward3. Compute the resultant lateral force for the soil-wall system shown in Figure 3. You may ignore tensile cracks. Use • A- Coloumb • B - Rankine 0=30°, y=20kN/m³ 4m Ground water table 7m c=50KN/m², p=10°, y=18KN/m³ 0=25°, y=20KN/m³ 8 m Gravity wall Figure 3arrow_forwardRead the question carefully and give me right solution according to the question.arrow_forward
- Q3) A retaining structure is given in figure. Calculate the factor of safety against sliding. (Ignore tensile crack behavior inside active part and ground water condition. Take 1.0 m interval step for point load calculation. k₁= k₂= 0.9). 3.B m 2.C m Yn: 20.0 kN/m² D: 2Eº c: 30 kN/m² 0.5 m 0.5 m 1 3.0 m 5.0 m Y cone ➜ 5A0 KN Yn: 18.5 kN/m³ c: 18 kN/m² $: ID º 24.0 kN/m³arrow_forwardAnswer with FOUR decimal placesarrow_forwardAnswer with FOUR decimal placesarrow_forward
- A 300 mm thick, 2.0 m wide footing slab supports a 200 mm thick concrete wall carrying uniform service dead load of 215 kN/m and service live load of 145 kN/m. Using f’c = 21 MPa and fy = 420 MPa. use flexure bar = 16mm. 1. calculate the ultimate shear force per 1-m-strip of footing slab at critical section 2. calculate the design shear strength of 1-m strip concrete footing slab 3. calculate the maximum factored wall wall that can be sustained by the footing slab based on shear strength onlyarrow_forwardUsing the Coulomb analysis approach, determine the active force on the retaining wall shown below. Q is a line load (out of plane) with Q=10*X kN/m (where X is the last digit of your student ID). Express Pa as a function of 0, and obtain the critical and the corresponding maximum På by trial and error of 0 values from 40° to 70°. 10.0m 20 Pa 2.0m 3.0m y=20kN/m³ $'=35° 1arrow_forwardConsider the wall shown below. Dimensions are in meters. sand O' = 30 0.5 0.5 > 1 K Determine the active force acting on the wall. Circle your answer. b. а. Determine the FS for sliding. Circle your answer. Determine the FS for overturning. Circle your answer. d. Determine the FS for overturning if a row of tiebacks is placed 2 meters below the backfill's ground surface. Tieback spacing is 2 meters. The capacity of each tieback is 50 kN. Circle your answer. C.arrow_forward
- UPVOTE WILL BE GIVEN. WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATION NEEDED. BOX THE FINAL ANSWER.arrow_forwardQ-A hollow rectangular masonry pier 600 mm x 900 mm and 150 mm thick transmits a vertical load of 500 KN in a vertical plane bisecting the 900 mm side and at an eccentricity of 100 mm from the geometrical axes of the section. Determine the maximum and minimum stress intensity in the section.arrow_forward4.17. A rectangular beam made using concrete with f c ′ = 6000 psi and steel with f y = 60,000 psi has a width b = 20 in., an effective depth of d = 17.5 in., and a total depth of h = 20 in. The concrete modulus of rupture f r = 530 psi. The elastic moduli of the concrete and steel are, respectively, E c = 4,030,000 psi and E s = 29,000,000 psi. The tensile steel consists of four No. 11 (No. 36) bars. ( a ) Find the maximum service load moment that can be resisted without stressing the concrete above 0 .45 f c′ or the steel above 0.40 f y . ( b ) Determine whether the beam will crack before reaching the service load. ( c ) Compute the nominal flexural strength of the beam. ( d ) Compute the ratio of the nominal flexural strength of the beam to the maximum service load moment, and compare your findings to the ACI load factors and strength reduction factor.arrow_forward
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