Simplified Method for Calculating the Settlement of Existing Tunnel Induced by New Tunneling Based on Two Step Method
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Settlement induced by new tunneling is important in assessing the safety of existing tunnel. A simplified settlement calculation method for the existing tunnel was obtained based on the two-step method. Firstly, ground settlement induced by tunneling was calculated using experimental method and elastic method. Then the entire tunnel deformation can be calculated using elastic-foundation-beam model and the ground settlement obtained in the first step was applied on the existing tunnel as a passive settlement load. Finally, the simplified method was verified by the results from modal test. The results show that the simplified method is available for calculating settlement of existing tunnel induced by new tunneling. Parametric study also studied in the paper, it is found that the tunnel settlement induced by tunneling increases with the increasing ground loss and decreases with the increasing net distance between new tunnel and existing tunnel. The settlement of tunnel with larger depth and harder soil stiffness is larger than the one with lower depth and softer soil when the ground loss is same.
KeywordsTunnel settlement Two-step method Elastic foundation beam Tunnel-soil interaction
The authors would like to acknowledge the financial support of the National Natural Science Foundation of China (No. 51509017) and the Education department of Henan Province, China (No. 17B560013).
- Jin, J., Yang, M.: Ground subsidence caused by tunnel excavation in sand. In: Geo-Shanghai, pp. 174–183 (2014)Google Scholar
- Jacobsz, S.W.: The Effects of Tunnelling on Piled Foundations. University of Cambridge, Cambridge (2002)Google Scholar
- Kimmance, J.P., Lawrence, S., Hassan, O., Purchase, N.J., Tollinger, G.: Observations of deformations created in existing tunnels by adjacent and cross cutting excavations. In: Proceedings of the Geotechnical Aspects of Underground Construction in Soft Ground, pp. 707–712 (1996)Google Scholar
- Peck, R.B.: Deep excavations and tunnelling in soft ground. In: Proceedings of the International Conference on SMFE, pp. 225–290 (1969)Google Scholar
- Vesic, A.B.: Bending of beams resting on isotropic elastic solid. J. Eng. Mech. Div. 87(2), 35–54 (1961)Google Scholar
- Zhang, F., Ye, B., Ye, G.: A unified description of Toyoura sand. In: Constitutive Modeling of Geomaterials, pp. 663–674 (2013)Google Scholar