REAL-TIME CONTROL OF INTERNAL FORCE OF RETAINING STRUCTURE FOR THE DEEP PIT

摘要

The diameter of the south anchor pit of Yangluo Yangtze river bridge is about 70m and the depth of it is 45m. During the process of construction, the internal force of the support for this pit must be controlled strictly. Informational construction technology such as numerical method and observation system is used to control excavation process. Based on the appropriate material constitutive equation, failure criterion and model of cracking, a nonlinear FEM model of retaining structure is presented. The stress of diaphragm wall is presented by back analysis based on in-situ displacement of retaining structure. The result fit the in-situ data well and provide theoretical basis for the safety evaluation of the retaining structure.