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An Analytical Solution of Shield Tunnel based on Force Method

An Analytical Solution of Shield Tunnel based on Force Method. Xiaomin You Zixin Zhang Yongsheng Li Dept. of Geotechnical Engineering Tongji University. 3nd Sino-Japan Joint Seminar for the Graduate Students. ITA （ 2000 ） Guidelines for the Design of Shield Tunnel Lining.

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An Analytical Solution of Shield Tunnel based on Force Method

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  1. An Analytical Solution of Shield Tunnel based on Force Method Xiaomin You Zixin Zhang Yongsheng Li Dept. of Geotechnical Engineering Tongji University 3nd Sino-Japan Joint Seminar for the Graduate Students

  2. ITA（2000） Guidelines for the Design of Shield Tunnel Lining

  3. Tunnel projects constructed in Shanghai in recent years • Large section → low ratio of thickness vs. diameter • Large section → shallow embedded depth

  4. Conventional Model

  5. STEP 1 STEP 2 β1 β2 STEP 3 Soil resistant pressure .

  6. Deduction based on Force-Method • 1st step: Force method equation

  7. 2nd step: to solve β1 and β2

  8. 2nd step: to solve β1 and β2 • 3rd step: Internal force

  9. Comparison • Analysis of the parameters • Effect of horizontal soil pressure coefficient • Effect of soil resistance coefficient • Comparison with different solutions Detailed information about cases adopted in analysis

  10. Effect of horizontal soil pressure coefficient

  11. Effect of horizontal soil pressure coefficient

  12. Effect of soil resistance coefficient

  13. Effect of soil resistance coefficient

  14. Comparison with different solutions

  15. CONCLUSION • For a given soil resistance coefficient and a shallow embedded depth, the distribution of soil resistant pressure is significantly effected by the value of horizontal soil pressure coefficient, and also the ratio of thickness versus diameter is a influencing factor. • For a given horizontal soil pressure coefficient and a shallow embedded depth, the distribution of soil resistant pressure is significantly effected by the value of soil resistance coefficient, and also the ratio of thickness versus diameter is a influencing factor. • The results predicted by the proposed analytical solution are compared with those of numerical simulation and the conventional model solution. The comparison indicates that the proposed solution agrees more reasonably, and it provides a new approach to better predict and make the preliminary design of shield tunnel lining

  16. ThankYou!

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