Back analysis of pile and anchor retaining structure based on BOTDA distributed optical fiber sensing technology

In order to understand the deformation law and internal force distribution characteristics of pile-anchor retaining structure in deep foundation pit engineering, stress system process excavation was tested by using distributed optical fiber sensing technology BOTDA. It uses supporting pile cloth set up strain cable collect from stability pit, which analyzes distribution. The results show that overall is small a stable state. monitoring energy truly reflect transmission force. shown bending moment maximum at action position anchor on 2.5m below bottom pit. design needs reinforce construction such locations. At same time, form earth pressure calculated reverse different conventional one. When there are multiple rows prestressed cables, applied support less than value classical theory. This theory engineering application has reference value.