Static instability criterion and safety factor of tunnels based on loading/unloading response ratio

TAN Xu-kai; GAO Feng; XU Wei

doi:10.11779/CJGE202209009

Volume 44 Issue 9

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Chinese Journal of Geotechnical Engineering > 2022 > 44(9): 1644-1653. > DOI: 10.11779/CJGE202209009

TAN Xu-kai, GAO Feng, XU Wei. Static instability criterion and safety factor of tunnels based on loading/unloading response ratio[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(9): 1644-1653. DOI: 10.11779/CJGE202209009

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Static instability criterion and safety factor of tunnels based on loading/unloading response ratio

TAN Xu-kai^{1, 2,},
GAO Feng^{1, 2, ,},
XU Wei²

1.
State Key Laboratory of Mountain Bridge and Tunnel Engineering (Chongqing Jiaotong University), Chongqing 400074, China
2.
School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

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Received Date: June 28, 2021
Available Online: September 22, 2022

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Abstract

Abstract

To obtain the method for static instability criterion of tunnels, the loading/unloading response ratio (LURR) theory is introduced into the analysis method. The nonlinear characteristics and the LURR variation laws of unlined circular tunnels under symmetrical loads are analyzed through the analytical method, and the results have proved their relevance. The research approach of LURR method is put forward based on the different loading characteristics of construction and operation tunnels. The critical conditions and the LURR variation laws of tunnels with and without linings are analyzed respectively through the finite element method. The results show that the nonlinear characteristics based on the LURR theory of tunnel deformation calculated by the analytical solution and the finite element solution are similar. The LURR variation laws of tunnel deformation are different in each loading and stability stages of tunnel system, the LURR variation rate in the weak area of the tunnel will be abnormal before its instability, and the abnormal variation trend is the precursor criterion of the instability of the tunnel system. Based on the determination of the ultimate bearing state of the tunnel system by the LURR method, the safety factor of the tunnel system is obtained by using the loading ratio. The static instability method based on the LURR theory of tunnels is proposed.
- tunnel engineering,
- loading/unloading response ratio,
- static instability criterion,
- safety factor,
- analytical method

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References

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