Deformation Controlled Calculation Method for the Embedded Depth of Cantilever Retaining Structure

The development of urban construction in China during the past few decades resulted in the great development of excavation engineering design methods. The traditional design methods are undergoing a transition from bearing capacity based control to deformation based control. Based on the proposed displacement-dependent lateral earth pressure model, the anti-overturning stability governing equation was established and solved using moment equilibrium equation. Taking the deformation of retaining wall as the control variable, the critical anti-overturning embedded depth of rigid retaining wall was obtained. The influencing factors of the critical insertion ratio of retaining wall, including the external and internal friction angles, excavation depths and the control displacement of retaining wall, were investigated. Research indicates that, the greater the external and internal friction angles, the better the stability of retaining wall, and the smaller the critical insertion ratio. The insertion ratios obtained by traditional limit equilibrium method are unsafe, and the degree of insecurity is more serious when the internal friction angle is relatively small. The controlled displacement of retaining wall has a significant influence on the critical insertion ratio. The smaller the control displacement, the larger the critical insertion ratio and the faster the insertion ratio increases. The insertion ratio is more obviously effected by the control displacement while the excavation depth is relatively large. The proposed calculation method can be used for the design of rigid retaining structure based on deformation control. © 2022, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.