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| Computational research on longitudinal deformation of subway tunnels caused by steel casing construction of bridge piles |
| DING Zhi1，ZHANG Xiao1，2，ZHANG Mobao3，DONG Yuqing1，LIU Kuntao4，XIA Nengwu4 |
(1. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China；2. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；
4. Shanghai Tunnel Engineering Co.，Ltd.，Shanghai 200082，China) |
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Abstract Relying on the construction project of a test bridge pile adjacent to a subway tunnel in Hangzhou，a simplified mechanical model of the steel casing construction of bridge piles is established，and a revised calculation formula for the additional force resulted from the construction of the full-pipe cast-in-place piles considering the construction characteristics of casing sections and the effect of soil squeezing is proposed. At the same time，based on the Mindlin stress solution and two-stage analysis method，the additional stress and longitudinal vertical deformation of the existing tunnel caused by the construction of the bridge piles are calculated，and the dynamic influence law of the whole process of construction of the bridge piles is further analyzed. The following conclusions are drawn：(1) The application of the reduction factor of the soil plug height and the section correction to respectively calculate the pile tip pressure，the pile side radial pressure and the pile side vertical friction is more in line with the distribution law of the additional force due to bridge pile steel casing construction. (2) The theoretical calculation results of the longitudinal deformation of the subway tunnel caused by the construction of the bridge pile steel casing are more consistent with the actual measurement data. (3) With continuously increasing the construction depth of the bridge pile steel casing，the existing tunnels first uplift slightly，then subside and finally tend to be stable，accompanied by the longitudinal settlement area further expanding. When the construction reaches near the buried depth of the tunnel，the tunnel reaches the maximum uplift，and the junction of uplift and settlement is located at the depth of 1.5D at the bottom of the tunnel. (4) The pile side vertical friction is a key factor that causes the deformation of the existing tunnel，and the influence will expand with the construction depth. The influence of the pile tip pressure will weaken after the construction is far away from the tunnel buried depth for a certain range, and the pile side radial pressure has little effect on the vertical deformation of the tunnel. (5) During the whole process of construction of bridge piles，attention should be paid not only to the development of the maximum vertical deformation of the tunnel，but also to the longitudinal heave change of the tunnel and the longitudinal dislocated deformation of the segments due to changes in the construction depth.
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2022, Vol. 41 
