Evaluation of Building Displacement Induced By EPB Tunneling Through GPS-GNSS Monitoring System and Back Analysis Technique (Tabriz Subway Twin Tunnels)
Abstract: One of the main
aspects of tunneling in urban areas is controlling the amount of settlement
that might cause some damage to the structures and infrastructures. In this
paper, the novel displacement monitoring system called Global Positioning
System - Global Navigation Satellite System (GPS-GNSS) has been applied to
monitor the building displacement .One of the most important features of this
approach is that this system provides three dimensional displacement behavior
of the building. Besides, in order to fulfill the purpose of accuracy, the
amount of settlement induced by Earth Pressure Balance (EPB) tunneling was
calculated by numerical, empirical and analytical methods. In order to achieve
this purpose, the back analysis technique was considered. The order in which
the geotechnical parameters are optimized depends on the amount of sensitivity
function. That is, the parameter of high sensitivity function is optimized
first. According to the calculations, the sensitivity analysis results show
that the maximum amount of sensitivity function with the volume loss of more
than 1% in respect to the internal friction angle is about 0.5, which is
greater than other geotechnical properties. According to the results of back
analysis technique, the optimized geotechnical properties were elastic modulus
(), internal friction angle () and cohesion () found on the volume loss of 1.5%
with less than 0.02% error. The maximum settlement of the building at the
studied area, explored by the optimized numerical method, is about 4 mm, which
is in the range of monitored data (3mm-13mm) obtained through GPS-GNSS
procedure.
Keywords: Settlement;
Geotechnical Properties; Tabriz Subway; GPS-GNSS Displacement Monitoring
System; Back Analysis
Author: Seyed Morteza
Davarpanah, Mostafa Sharifzadeh, Javad Sattarvand, Samad Narimani
Journal Code: jptsipilgg160030
