Abstract
Pre-excavation dewatering (PED) can cause a significant wall deflection. How to predict this deformation is an urgent problem to be solved. The elastic foundation beam method is widely adopted to predict the wall deflection. A key issue that need to be addressed in the use of this method is to obtain the distribution of the horizontal foundation modulus. However, the distribution pattern of horizontal foundation modulus under PED is not clear. In this study, a numerical model is established and verified, and a series of numerical simulations are carried out to investigate the distribution of horizontal foundation modulus along depth under conditions of different excavation width and depth. The numerical results are compared with those computed by the ‘m method’, which is a traditional excavation design method recommended in the Chinese Code. The results indicate that under the common conditions of PED, the horizontal foundation modulus decreases greatly compared with the values determined by m method, and the larger the excavation width and dewatering depth, the greater the decrease extent. When using the elastic foundation beam method to predict the PED-induced wall deflection, the deflection will be underestimated if the m method is used to determine the horizontal foundation modulus.
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Acknowledgements
The research is funded by the National Natural Science Foundation of China under Grant No. 51708206 and 11602083, the Natural Science Foundation of Hunan Province under Grant No. 2016JJ6044, the China Postdoctoral Science Foundation under grant No. 2018M633298, and the Special Funding Project for Postdoctoral Research in Guangxi under grant No. BH2018054. These financial supports are gratefully acknowledged.
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Xue, XL., Li, MK., Zeng, CF. (2018). Distribution Patterns of Horizontal Foundation Modulus Under Pre-excavation Dewatering. In: Wu, W., Yu, HS. (eds) Proceedings of China-Europe Conference on Geotechnical Engineering. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-97115-5_38
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DOI: https://doi.org/10.1007/978-3-319-97115-5_38
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