Study on the Flexural Resistance of Artificial Frozen Soil in Ningbo Area

Based on the Jintang undersea tunnel project in Ningbo area, to study the laws and characteristics of the flexural strength of artificial frozen soil, the flexural strength tests of silty soil and silty clay in the tunnel were carried out under different temperatures and water content. The results show that the flexure strength of silty soil and silty clay increases with the decrease of freezing temperature, and the flexure strength of frozen soil is obviously affected by freezing temperature. Different water content has a certain effect on the flexural strength of silt and silty clay. The flexural strength of silty soil samples reaches maximum when the water content is 30%. When the water content is 34%, the flexural strength of silty clay is the highest. When the soil moisture content exceeds the optimal saturated moisture content, the flexural strength of frozen soil decreases. The experimental results can provide scientific guidance for the design and construction of freezing method of Jintang submarine tunnel.