Semi-Empirical Method for Estimating Stiffness and Deformation of Cylindrical Retaining Diaphragm Wall

This study presents a semi-empirical method to estimate stiffness and deformation of cylindrical retaining diaphragm wall. Based on the concept of "arch-beam" method, the retaining structure is separated into two structural components: arch unit and supported beam unit. The stiffness of both units is computed by parameter analytical method and then combined to obtain the total retaining stiffness of cylindrical diaphragm wall. The proposed model incorporates major factors considered in design of cylindrical retaining structure such as soil condition, geometry of excavation, geometries and materials of diaphragm wall, spacing and stiffness of ring beam, joints in diaphragm wall. A statistical equation is developed to relate the stiffness and lateral wall deformation. The proposed stiffness and deformation model is validated by 24 cylindrical excavation cases in literature

Field measurement and numerical analysis of ground vibration caused by metro

This paper presents the field measurement of ground vibration at the section of Long-Yang station along the Metro line 2 in Pudong of Shanghai. With the loading data for calculation from the measurement, the ground vibration caused by metro is simulated by the finite element method (FEM). Then the characteristic of wave propagation is obtained along the ground. The influences of the embedded depth of tunnel on vibration are discussed. Finally, the main causes of the differences between calculation and measurement are analyzed