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A 2.8 m wide reinforced concrete strip footing is situated at 2.5 m below ground level...

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Civil Engineering

A 2.8 m wide reinforced concrete strip footing is situated at2.5 m below ground level in a thick deposit of a saturated clay.The footing is loaded centrally, and the total vertical line loadincluding the weight of the concrete and backfill is 308 kN/m. Theclay has a bulk density (ρ) of 2250 kg/m3 and an undrained shearstrength (cu) of 42 kPa.

a) Calculate the factor of safety against bearing capacityfailure considering the short term response of the soil.

b) If the strip footing in part a) has to carry an additionalhorizontal line load of 50 kN/m, calculate the new factor of safetyagainst bearing
capacity failure.

c) Briefly define the terms compression, compaction andconsolidation and explain what are the resulting changes in voidratio and moisture content in each of the above cases, assuming aconstant total stress is applied onto the soil.

d) A normally consolidated and an over-consolidated clay aresubjectedto the same increment of effective stress. Which wouldresult in a higher settlement? Assume the initial void ratio andthe height of the soil layer to be the same for both cases. Justifyyour answers using appropriate plots and/or equations.

Answer & Explanation Solved by verified expert
4.4 Ratings (873 Votes)
aThe ultimate bearing capacity equation is as followsBut for So 2250 x 981 2207 kNm3q 2207 x 25 5518 kPac 42 kPaqu 42 x 514 5518 27106 kPaThe stress coming on to the soil qstress 110 kPaFactor of safety qu qstress 27106 110 246bqstress 127857 kPaFactor of safety qu qstress 27106 127857 212cCompaction is the densifying of soil by removing air throughcompactive    See Answer
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