Numerical Evaluation of Symmetric Prism Method to Analyze the Splitting Forces Due to TBM Jack Loads
- 1 Civil Engineering Department, Eyvanekey Institute of Higher Education, Semnan, Iran
- 2 Civil Engineering Department, Eyvanekey Institute of Higher Education, Semnan, Iran
- 3 Civil Engineering Department, Semnan University, Semnan, Iran
- 4 Civil Engineering Department, Islamic Azad University, Fars Science and Research Branch, Shiraz, Iran
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 condi tions. 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.
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