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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摘要增压式真空预压法是一种新兴的软土改良技术，目前对其固结理论的研究成果相对较少，基本处于起步阶段。基于等体积应变假设和达西定律，提出一种包含增压管和排水板的新型等效固结解析模型。首先，针对地基固结过程中排水板出现的淤堵问题，考虑排水板的变井阻效应，假定其渗透系数随时间指数衰减并随深度线性衰减；另外，考虑排水板涂抹作用以及土体内径–竖向渗流，推导了该模型的固结控制方程及其解析解。通过理论退化和比较研究，并与实际工程案例进行对比分析，验证了该解答的合理性。最后，通过参数敏感性分析对增压式真空预压固结特性进行研究，分析各种参数对固结性状的影响。结果表明：与传统真空固结解析模型相比，增压法能更有效地促进土体固结；考虑排水板的变井阻效应时，地基的固结进程将会减缓，且时间井阻因子?b的变化对地基后期固结速率的影响很大；单元内排水板布置越密集、土体泊松比越大、增压管影响区域越小或增压压力越大，均会导致地基固结加快。

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	卢萌盟1
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	孙锦鑫1
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	李传勋3
	高浪4

关键词 ：土力学, 增压式真空预压, 淤堵效应, 变井阻, 排水板, 固结

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

引用本文:

卢萌盟1，2，孙锦鑫1，2，李传勋3，高浪4. 考虑变井阻的增压式真空预压固结解析模型及解答[J]. 岩石力学与工程学报, 2023, 42(5): 1259-1272.
LU Mengmeng1，2，SUN Jinxin1，2，LI Chuanxun3，GAO Lang4. Analytical solutions for consolidation of soft soil improved by air-boosted vacuum preloading considering the varied well resistance of PVDs. , 2023, 42(5): 1259-1272.

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

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