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Controlling subsidence caused by de-watering in a deep foundation pit

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Abstract

In China, more and more underground structures are being built close to buildings of architectural merit. When installing deep foundations, three ways of controlling seepage are suggested. In Mode III, an installed curtain extends partly into the confined aquifer so that the hydraulic connection between the excavated section and the water in the host material is partly isolated. The combined effects of pumping, curtain efficiency and recharge are discussed. Based on the engineering geological conditions of the deep foundation pit of the Yishan Road Station of Metro Line 9, Shanghai, China, in situ pumping and recharge tests were carried out. The combined effects are similar to the results obtained using a three-dimensional finite difference method (FDM) numerical simulation.

Résumé

En Chine, des structures souterraines de plus en plus nombreuses sont construites à proximité de bâtiments présentant un intérêt architectural. Trois moyens de contrôler les écoulements lors de la réalisation des fondations profondes sont suggérés. Dans le Mode III, un rideau d’injection est réalisé, pénétrant partiellement dans l’aquifère captif de sorte que la connexion hydraulique entre le volume excavé et l’eau de la formation hôte est partiellement coupée. Les effets combinés du pompage, du rideau d’injection et d’une recharge hydraulique sont discutés. Considérant les conditions géologiques et géotechniques de l’excavation profonde de la station Yishan Road de la ligne 9 à Shanghai (Chine), des essais de pompages in situ et des essais de recharge hydraulique ont été réalisés. Les effets obtenus sont semblables aux résultats issus d’une simulation numérique basée sur une méthode tridimensionnelle aux différences finies.

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Acknowledgments

This work presented in this paper was supported by the research grant (No. 41072205, No. 50579097) from National Natural Science Foundation of China, the research grant (No. 10ZR1431500) from Shanghai Natural Science Foundation of China.

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Authors and Affiliations

  1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, 200092, China

    Jianxiu Wang, Lingao Wu, Yiqun Tang & Ping Yang

  2. Department of Geotechnical Engineering, Tongji University, No.1239, Siping Road, Shanghai, 200092, China

    Jianxiu Wang, Bo Feng, Yan Liu, Lingao Wu, Xingsheng Zhang, Yiqun Tang & Ping Yang

  3. Shanghai Tunnel Engineering Corporation Ltd, Shanghai, 200082, China

    Yanfei Zhu

Authors
  1. Jianxiu Wang
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  2. Bo Feng
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  3. Yan Liu
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  4. Lingao Wu
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  5. Yanfei Zhu
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  6. Xingsheng Zhang
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  7. Yiqun Tang
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  8. Ping Yang
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Correspondence to Jianxiu Wang.

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Wang, J., Feng, B., Liu, Y. et al. Controlling subsidence caused by de-watering in a deep foundation pit. Bull Eng Geol Environ 71, 545–555 (2012). https://doi.org/10.1007/s10064-012-0420-0

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  • DOI: https://doi.org/10.1007/s10064-012-0420-0

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