Three mechanical models of diaphragm wall joint

i. e. flexible joint without resistance to shearing and bending

relative rigid joint with resistance to shearing and absolute rigid joint with resistance to shearing and bending

are established based on different effects of transverse stress transferring. In order to choose a reasonable joint for shield working well of Nanjing Weisan-road Yangtze River tunnel

the deformation and mechanical properties of diaphragm wall are analyzed by using above models. The results show that: flexible joint is easy to cause the increase in displacement of diaphragm wall and soil; and finally

leads to increase internal force of supports. Relative rigid joint are able to not only resist the displacement of diaphragm wall

but also decrease stress of diaphragm wall by transferring the stress to the temporary supports and ring beams; Absolute rigid joint may result in diaphragm wall undertake significant transverse and longitudinal moment. By comprehensive consideration

the relative rigid joint is chosen for the working well.