Question

For the retaining wall shown below: SOIL 18 ft 6 kips/ft 12 6 5' Area Weight (kips/ft of wall) Moment Arm (ft) Moment about point A (kip-ft per foot of wall) 6.75 3.33 22.50 10.80 7.00 75.60 2 Both areas 1 and 2 are concrete (part of the retaining wall). The earth pressure has already been determined as 6 kips/ft of wall. Use the information provided in the table for calculations.

a) What is the factor of safety against overturning?

b) What is the distance from A the normal for N acts? Is 100% of the base in contact with the soil based on this information?

c) If the foundation soil is sand and the interface friction angle is 37 degrees, what is the factor of safety against sliding

d) What is the factor of safety against bearing capacity failure (use Meyerhoffs Method) if the ultimate capacity of the foundation soil is 8 ksf (kips per square foot)?

Answer 1

EW blog z = EMR-mo EK æ EW = + Witha = 675 +10.80 = 17.55 kipslift Normal acting distance ( x ) = ? a = 9841-36 17:55 = 3.538 ft from 'Al point: if е <B • Soil is 100% contact with soil EN e= B 2 X 9-3:538 2 * = 0.964 <2 6 8-9 ez 0.964 < 1.5 - S01 18 100 y. contacted with base-

Clo's Boese = 37. (Fs) sliding C&w) tans+ Ca Bt pp Pa -xobese c=0i Ca=0; 8 = 24.67"; Dj = 0; pp=0 S +37= 94.67° 3 (Es soding (EW) tans Pa (17.55) tan( 24.67) 6 8.060967642 6 = 1,343 <lig unsafe); quit = 8 ksf; (given (18) quit qman

QS let us consider given retaining wall Continle.oves fooling with width (B)-aft EK man (1+ be B L aft & B er already Calculated po pert-b min Imaal + mas = 17.55 15:55 (1 + Excupce १ = 3.2006 > (Fs) Be 2.499 ~ 9.5 3.2006 Esbe 2.5 < 3; Unisefe )