Abstract
The post-peak response of elasto-plastic material is dependent upon the stress path it is subjected to. This paper analyses and compares the stress path and strain response of advancing tunnel, using two-dimension:1al plane strain (2D PS) and full three-dimensional step by step excavation and support (3D SBS) finite difference numerical model (FDM). Stress paths for 3D SBS model indicate higher stress relaxation and straining at unsupported spans as well as elastic recompression behind applied supports; these features are not evident in 2D PS models. Implications of these differences on tunnel response are discussed. The complex 3D stress evolution with tunnel construction is greatly simplified by considering major and minor principal stresses only, for the purpose of stress path generation. To verify that the formulation of stress path adopted here is sufficient to describe stress–strain evolution of 3D SBS tunnel model, a numerical simulation of “stress path following triaxial unloading test” is conducted using “simplified loading conditions.” Results show that the suggested test methodology has potential to map stress path of 3D SBS tunnel model for ideal geomaterial behavior. Also, improvement in measured strain response, as compared to 2D PS models, is observed.
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Abbreviations
- \(d\) :
-
Tunnel diameter (m)
- \(e\) :
-
Unsupported span (m)
- \(u\) :
-
Radial displacement of tunnel walls (m)
- \({\sigma }_{1}, {\sigma }_{2},{\sigma }_{3}\) :
-
Major, intermediate, and minor principal stress (MPa)
- \({e}_{1}\),\({e}_{2}\), \({e}_{3}\) :
-
Major, intermediate, and minor principal strains
- \({K}_{13}=\frac{{\sigma }_{1}}{{\sigma }_{3}}\) :
-
Stress ratio; ratio of major and minor principal stress
- \({e}_{max}= \sqrt{{\left({e}_{xx}-{e}_{yy}\right)}^{2}+ {\left({e}_{yy}-{e}_{zz}\right)}^{2}+ {\left({e}_{zz}-{e}_{xx}\right)}^{2}+{{\tau }_{xy}}^{2}+{{\tau }_{yz}}^{2}+{{\tau }_{zx}}^{2}}\) :
-
= Maximum shear strain invariant.
- \({e}_{vol}= {e}_{xx}+{e}_{yy}+{e}_{zz}\) :
-
Volumetric strain invariant
- \({{e}_{max}}^{p}\) :
-
Plastic component of shear strain invariant
- \({{e}_{vol}}^{p}\) :
-
Plastic component of volumetric strain invariant
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Sharma, S., Muthreja, I.L. & Yerpude, R.R. Stress path analysis of advancing tunnel with supports installed close to face. Bull Eng Geol Environ 80, 6221–6244 (2021). https://doi.org/10.1007/s10064-021-02309-z
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DOI: https://doi.org/10.1007/s10064-021-02309-z