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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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

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	Articles by authors
	LEI Huayang1
	2
	LIU Anyi1
	LIU Jingjin1
	2
	LI Chenyuan1

Cite this article:

LEI Huayang1,2,LIU Anyi1, et al. Analysis of influence factors on reinforcement effect of alternate vacuum preloading method for ultra soft soil foundations[J]. , 2022, 41(2): 377-388.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0247 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I2/377

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