超软土地基交替式真空预压法加固效果影响因素分析

doi:10.13722/j.cnki.jrme.2021.0247

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摘要针对目前常规真空预压法处理超软土地基时常出现的排水板易淤堵、加固效果欠佳等工程问题，提出一种新型的交替式真空预压技术。为深入了解交替式真空预压技术处理超软土地基的加固效果及其影响因素，对天津滨海新区新近吹填淤泥进行室内模型试验。试验结果表明，与常规真空预压法相比，交替式真空预压法可以有效防止淤堵泥层的加剧，使得土体加固效果提升。其中交替式真空预压的真空压力大小、交替时机等因素对土体的加固效果有明显的影响，采用较小的真空压力，或者在淤堵泥层开始形成阶段进行交替，能有效提高土体的加固效果，结果显示可增大土体排水量6.25%～14.82%，增大沉降量4.28%～7.73%，提高十字板剪切强度4.53%～18.7%。

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	雷华阳1
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	刘安仪1
	刘景锦1
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	李宸元1

关键词 ：地基基础, 超软土, 地基处理, 交替式真空预压, 淤堵, 模型试验

Abstract：Conventional vacuum preloading technology has engineering problems such as easy clogging of drainage plates and poor reinforcement effect when strengthening ultra soft soil foundations. In view of these problems，a new type of vacuum preloading method，named as alternating vacuum preloading method，was proposed in which the vacuum pressure is alternately applied to the drain plate in time-sharing mode. In order to explore the reinforcement effect and the corresponding influencing factors of the alternate vacuum preloading method，laboratory model tests were carried out on the ultra soft soil in Tianjin Binhai New Area. The research results show that，compared with the conventional vacuum preloading method，the alternating vacuum preloading makes the soil particles move alternately，which can effectively prevent the formation of clogged mud layers and improve the reinforcement effect. The size of the vacuum pressure and the timing of alternation have a significant impact on the reinforcement effect of the soil. Using a smaller vacuum pressure，or carrying out alternation at the beginning of the formation of the silt mud layer，can effectively improve the reinforcement effect of the soil. It is revealed that the drainage，the settlement and the vane-shear strength can be increased by 6.25%–14.82%，4.28%–7.73% and 4.53%–18.7%，respectively.

Key words： foundations ultra soft soil foundation treatment alternative vacuum preloading clogging model test

引用本文:

雷华阳1，2，刘安仪1，刘景锦1，2，李宸元1. 超软土地基交替式真空预压法加固效果影响因素分析[J]. 岩石力学与工程学报, 2022, 41(2): 377-388.
LEI Huayang1，2，LIU Anyi1，LIU Jingjin1，2，LI Chenyuan1. Analysis of influence factors on reinforcement effect of alternate vacuum preloading method for ultra soft soil foundations. , 2022, 41(2): 377-388.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0247 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/377

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