Shaking Table Test of Composite Foundation Reinforcement of Saturated Silty Soil Ground for High Speed Railway

Three shaking table model tests were conducted with a geometrical scale of 1:10 using a large-scale laminar shear box to investigate the reinforcement effects of compacted gravel column-net composite foundation and cement fly-ash gravel (CFG)column-net composite foundation on the saturated silty soil ground along the Beijing-Shanghai high speed railway.The research results indicate that the increase of excess pore water pressure can be restrained effectively by the compacted gravel column-net composite foundation to improve the anti-liquefaction ability of ground,and that shear displacement of ground can be reduced greatly by the compacted gravel column-net and CFG column-net composite foundations to improve the anti-shear displacement ability of ground.Furthermore,the amplifying of response acceleration,induced by foundation liquefaction,and the settlement of foundation and subgrade can be reduced greatly by the compacted gravel column-net and CFG column-net composite foundations to improve the aseismatic property of foundation and subgrade.