The law of side wall soil pressure and settlement in the process of caisson sinking in soft soil area is obtained by field test,which is a reliable means to study the development law of side wall friction.In this paper,the side wall soil pressure and settlement of caisson in Ningbo area are monitored in real time.The influencing factors of soil pressure on caisson side wall are analyzed.The relationship between settlement and side wall soil pressure is obtained.The phenomenon of side wall soil pressure relaxation is found different from the existing research.Therefore,a new calculation model of side wall resistance of shallow subsidence of caisson in soft soil area is proposed.The total lateral wall resistance distribution curve calculated by the new model is close to the measured curve.And the calculated results of the side wall drag were validated through actual engineering.
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