Testing and theoretical studies on the interaction between soil and shaft wall during deep soil compression due to losing water

A method for testing the interaction between soil and shaft wall by high pressure direct shear apparatus and triaxial servo test system has been presented. The shear stress-displacement curves, coefficient of unit stiffness and strength parameters of the interaction between soil and shaft wall are obtained. Combining the tested results, it is analyzed for the deformation characteristics of the interaction on the interface zone between soil and shaft wall during the compression of the deep soils due to losing water, which is plastic and elastic in the deep and shallow part respectively.An elastic perfectly plastic analysis model of the interaction between soil and shaft wall has been set up. Some analytic formulae to calculate the additional vertical displacement, strain and stress of the shaft lining are obtained. The variation law of these values of the shaft lining with the depth, compression value of the deep soils and so on are discussed. Finally presented are two cases with calculated results to show the practicability of the theoretic research.