TITLE:
Numerical Evaluation of Symmetric Prism Method to Analyze the Splitting Forces Due to TBM Jack Loads
AUTHORS:
Hamid Saberi, Vahid Saberi, Ali Kheyroddin, Ashkan Firouzi
KEYWORDS:
Tunnel; Concrete Segment; TBM Jack Loads; Symmetric Prism Method; Numerical Solutions
JOURNAL NAME:
Open Journal of Safety Science and Technology,
Vol.3 No.3,
September
20,
2013
ABSTRACT: Final lining in mechanized excavation includes the precast concrete
segments. These segments are designed for applied loads during construction,
moving, depot, assembling in the tunnel and service loads that are affected by
earth conditions. One of these loads that are applied to the segments after
assembling in the ring, are TBM jack loads especially when the TBM should
excavate squeeze zones with single mode. As the jack pad section is smaller
than the segment section, it causes splitting loads in the segment. Symmetric
prism method is an approximate solution to evaluate these forces. In this
paper, calculated results by this method are compared to that of numerical
solution by ANSYS software. It shows 10 - 20
percent difference between numerical and analytical results.