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The influence of the tamping mode on the clogging effect of the vacuum-dynamic drainage consolidation method

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Abstract

During a vacuum consolidation, due to the faster consolidation rate at the zone near the prefabricated vertical drain (PVD), a lower-permeability zone will be formed around the PVD, reducing the radial propagation rate of the vacuum pressure. Thus, a vacuum-dynamic drainage consolidation method was proposed to alleviate the clogging effect of a “soil column” produced in the vacuum preloading process. A series of model tests for different tamping modes (a combination of tamping sequence and energy) are conducted in this study. The vacuum pressure, water discharge, excess pore water pressure, surface settlement, intergranular pore, and soil shear strength changes were also analyzed. The results indicate that, under the vacuum-dynamic drainage consolidation, which uses low energy to tamp the soil near the PVD after using high energy to tamp the ground near the periphery of the model, the water discharge amount increased faster, and the final discharge volume was more significant than that obtained under the other methods. The relative settlement of the vacuum-dynamic drainage consolidation method is about 1.47 times that of the traditional vacuum preloading method. At the same time, the pore size results between the soil particles prove that the relatively high-energy tamping energy is used to ram the soil around the model barrel, and then the low-energy tamping energy is used to ram the soil near the PVD unit, which can be more effective in strengthening. Wenzhou hydraulic fills the ground to make it suitable for a broader range of construction land requirements.

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Funding

This research was supported by the National Key R&D Program of China (2016YFC0800200), the National Natural Science Foundation of China (grant nos. 51778500, 51778501, 51878512), the Zhejiang Province Natural Foundation Projects of China (grant nos. LR18E080001, LY20E080029), and the Key Research and Development Program of Zhejiang Province (grant no. 2018C03038). This financial support is gratefully acknowledged.

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Authors and Affiliations

  1. Architecture and Civil Engineering College, Wenzhou University, Wenzhou, 325025, Zhejiang, China

    Xiaobing Li, Jun Li, Guohui Yuan & Hongtao Fu

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  1. Xiaobing Li
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  2. Jun Li
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  3. Guohui Yuan
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  4. Hongtao Fu
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Correspondence to Hongtao Fu.

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Responsible Editor: Zeynal Abiddin Erguler

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Li, X., Li, J., Yuan, G. et al. The influence of the tamping mode on the clogging effect of the vacuum-dynamic drainage consolidation method. Arab J Geosci 15, 148 (2022). https://doi.org/10.1007/s12517-021-09421-0

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  • DOI: https://doi.org/10.1007/s12517-021-09421-0

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