考虑变井阻的增压式真空预压固结解析模型及解答

doi:10.13722/j.cnki.jrme.2022.1040

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Abstract Air-boosted vacuum preloading(AVP) is a newly emerging soft soil improving technology. The studies on the analytical theories of the consolidation with AVP are at the starting stage for few related reports in the literature. To fill this gap，an analytical model for the consolidation of soft ground improved by AVP is proposed based on the assumptions of equal volumetric strain and Darcy?s law. Firstly，the varied well resistance effect of the prefabricated vertical drains(PVDs) is considered based on an assumption that its permeability coefficient decays exponentially with elapsed time and linearly with depth simultaneously. In addition，the smear effect of PVDs and the coupled radial-vertical seepage within soil are also considered to obtain analytical solutions. Then，the reasonability of the present analytical model is verified by degeneration and comparing it to the existing solution and applying it to analyze two field tests. Finally，the present solution with instantaneously loading is adopted to investigate the influence of several parameters on the consolidation behavior. The results show that the AVP can accelerate the consolidation rate more effectively，comparing to the conventional vacuum consolidation technique. The consolidation process of the ground will be retarded with consideration of the clogging effect of PVDs. Moreover，the time well resistance factor ?b has a great influence on the consolidation rate in the later stage. The following factors will lead to a faster consolidation of soft ground，such as a denser layout of PVDs，or a larger Poisson?s ratio of soil，or a smaller influence area of air-boosted pipes or a larger pressurized pressure.

Key words： soil mechanics air-boosted vacuum preloading clogging effect varied well resistance prefabricated vertical drains(PVDs) consolidation

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	Articles by authors
	LU Mengmeng1
	2
	SUN Jinxin1
	2
	LI Chuanxun3
	GAO Lang4

Cite this article:

LU Mengmeng1,2,SUN Jinxin1, et al. Analytical solutions for consolidation of soft soil improved by air-boosted vacuum preloading considering the varied well resistance of PVDs[J]. , 2023, 42(5): 1259-1272.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1040 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I5/1259

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