Foru=0 Ny=0,N=1,Ne=5.14 (From Terzaghi's chart) For=0 values can be more accurately read from Skempton's chart also on p28 in Data Sheets,and this is discussed further below. 4r g.N,T,+eN. qr =30x1 +0+25x5.14 =158.5kPa (Bearingcapacity) Q qrx B 158.5x5 792.5 kN/m (Bearing Force) 2.Long term-Effective stress analysis qs=30kPa =2×9.8=19.6kPa q's=10.4 kPa y=15-9.8=5.2kPa For'=250 Ng=13,Ne=24.5,N=10 (From Terzaghi's chart) iNN,e'N, qr=10.4×13+0.5×5.2x5×10+2×24.5=314.2kPa qf=314.2+19.6=333.8kPa Q =1669kN/m 4.2.2 Total stress analysis for=0 The analysis is more straightforward for=0soil.The bearing capacity formula reduces to gr Ne cu qs Values of Ne can be obtained from the chart produced by Skempton shown below(p28 in Data Sheets).It can be seen that Ne varies with the depth to width ratio D/B and with the shape of the footing.This chart is also applicable to deep foundations,that is with D/B>1. It is often assumed that the stress due to the weight of the footing.and any soil used to bury the footing,is equivalent to the soil stress qs and thus the net bearing capacity can be written qult Cu Ne For u = 0 N =  q = 1, Nc = 5.14 (From Terzaghi’s chart) For u = 0 values can be more accurately read from Skempton’s chart also on p28 in Data Sheets, and this is discussed further below. q q N B f = s q + N + cNc   2 qf = 30  1 + 0 + 25  5.14 = 158.5 kPa (Bearing capacity) Q = qf  B = 158.5  5 = 792.5 kN/m (Bearing Force) 2. Long term - Effective stress analysis qs = 30 kPa uo = 2  9.8 = 19.6 kPa q’s = 10.4 kPa ’ = 15 - 9.8 = 5.2 kPa For ’ = 25o Nq = 13, Nc = 24.5, N = 10 (From Terzaghi’s chart)  =  +  q q N +  B f s q N c Nc   2 q’f = 10.4  13 + 0.5  5.2  5  10 + 2  24.5 = 314.2 kPa qf = 314.2 + 19.6 = 333.8 kPa Q = 1669 kN/m 4.2.2 Total stress analysis for u = 0 The analysis is more straightforward for u = 0 soil. The bearing capacity formula reduces to Values of Nc can be obtained from the chart produced by Skempton shown below (p28 in Data Sheets). It can be seen that Nc varies with the depth to width ratio D/B and with the shape of the footing. This chart is also applicable to deep foundations, that is with D/B > 1. It is often assumed that the stress due to the weight of the footing, and any soil used to bury the footing, is equivalent to the soil stress qs and thus the net bearing capacity can be written qult = cu Nc f c u s q = N c + q