Research on the effect of buried channels to the differential settlement of building

Shanghai has the representative soft ground in China. The stratum of Shanghai mainly made up of saturated clay, silty clay and sand. Most metro stations and tunnels of Shanghai lie about 20 m beneath the ground surface. Soil of such depth mostly is soft clay which characteristics such as water content, degree of sensitivity, compressibility and rheology are notable, and the unit mass, strength and permeability are bad. Except those, the adverse geological factors such as buried channel, shallow-buried methane, underground barrier etc. may be exist which will do harm to the constructing of deep excavation and adjacent buildings. So the adverse geological factors should be paid enough attention.