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Analysis of earth pressure distribution on deep circular shafts in composite geological strata using centrifuge modelling

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Abstract

With the rapid development of urban underground space, the depth of working shaft has been gradually becoming deeper to accommodate the underground construction needs. The existing studies for earth pressure distribution of shafts are mainly focused on sandy soils within 30 m. There is a strong need to investigate the earth pressure distribution on deep shafts (more than 30 m) in complicated soil conditions using centrifuge modelling to fill the knowledge gap and provide experimental basis for design. In this paper, geotechnical centrifuge modelling was used to investigate the earth pressure distribution along deep circular shaft structures (with a depth of 100 m) in composite geological strata. Three centrifuge tests on model shafts in layered ground with different thickness of clay and sand were carried out, respectively. Drainage method was used in the experiment to simulate the unloading effect caused by excavation of soils inside the shaft model. The earth pressure distributions along the shaft lining before and after the excavation were investigated. The results were analysed and compared with other existing earth pressure theories. This research provides valuable insights for earth pressure distribution for design of circular deep shafts (e.g. 100 m) in composite geological strata.

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Correspondence to Lei Wang.

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Ma, X., Liu, C., Wang, L. et al. Analysis of earth pressure distribution on deep circular shafts in composite geological strata using centrifuge modelling. Bull Eng Geol Environ 80, 4089–4096 (2021). https://doi.org/10.1007/s10064-021-02178-6

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  • DOI: https://doi.org/10.1007/s10064-021-02178-6

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