E3S Web Conf.
Volume 248, 20212021 3rd International Conference on Civil Architecture and Energy Science (CAES 2021)
|Number of page(s)||5|
|Section||Chemical Performance Structure Research and Environmental Pollution Control|
|Published online||12 April 2021|
Back analysis of pile and anchor retaining structure based on BOTDA distributed optical fiber sensing technology
1 Urban Rail Transit Group CO.LTD, Guiyang, 550081 ;
2 Metro Real Estate Co Ltd, Guiyang, 550081 ;
3 Guizhou Transportation Planning Survey and Design Academe CO., LTD., Guiyang, 550001
* Corresponding author: Bo Jiang, email: firstname.lastname@example.org
In order to understand the deformation law and internal force distribution characteristics of the pile-anchor retaining structure in deep foundation pit engineering, the stress of the pile-anchor retaining system in the process of foundation pit excavation was tested by using the distributed optical fiber sensing technology of BOTDA. It uses the supporting pile cloth to set up the strain cable to collect the strain from the excavation process to the stability of the foundation pit, which analyzes the stress and internal force distribution. The results show that the overall deformation of the foundation pit is small and in a stable state. It uses the monitoring strain energy to truly reflect the distribution and transmission law of the pile internal force. It is shown that the bending moment is the maximum at the action position of the anchor cable on the pile anchor structure and 2.5m below the bottom of the pit. The design needs to reinforce the construction of such locations. At the same time, the distribution form of earth pressure calculated in reverse is different from the conventional one. When there are multiple rows of prestressed anchor cables, the earth pressure applied on the support is less than the calculated value of classical earth pressure theory. This pile anchor structure design theory and engineering application has reference value.
© The Authors, published by EDP Sciences, 2021
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