Influence factor IpInfluence factor IpInfluence factor IpIpBase of equivalent raft foundationAssumed incompressibleSettlement at corner of loaded areaPoisson's ratio 0.2
(Ed–Ef) B
Ef Hri
EfEd EfEfEo
qHDq×B×B×LkDiagrams applicable for H/B >10Influence factor IpInfluence factor Ip0
0
2
4
H/B 6H/BH/BH/BH/BUse for L/B>108
100
2
4
6
8
100
2
4
6
8
100
2
4
6
8
100
2
4
6
8
100.1 0.2 0.3 0.4 0.5 0.6 0.70 0.1 0.2 0.3 0.4 0.5 0.6 0.70 0.1 0.2 0.3 0.4 0.5 0.6 0.70 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9L/B 1L/B 2L/B 3k 10 k 5k 2k 1k 0.5 k 0.25 k 0.125 k 0k 10 k 5k 2k 1k 0.5 k 0.25 k 0.125 k 0k 10 k 5k 2k 1k 0.5 k 0.25 k 0.125 k 0k 10 k 5k 2k 1k 0.5k 0.25 k 0.125 k 0k 10 k 5k 2k 1k 0.5 k 0.25 k 0.125 k 0L/B 5L/B 10×(1 + )kHBFigure 5.33Values of influence factor for deformation modulus increasing linearly with depth and
modular ratio of 0.2 in rock (after Meigh(5.23)).