可控通气真空预压室内模型试验及其机制分析

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摘要随着滨海新区的开发建设，围海造陆形成越来越多的土地，它是由含水量高达80%以上的吹填土形成的，在进行真空预压处理过程中如何控制投资成为现在亟待解决的问题。为探索更为经济的真空预压工艺，根据真空预压加固机制首次提出可控通气真空预压的概念，并设计可控通气真空预压室内模型试验。通过试验对相同条件下可控通气和常规真空预压进行对比研究，得出相同条件下2个模型的沉降、孔压变化和土体内真空压力随时间变化曲线。试验结果表明，在相同的加固时间、真空荷载和模型尺寸条件下，可控通气真空预压比常规真空预压加固效果好，说明可控通气真空预压加固高含水量软土地能够缩短加固时间，节省资金。最后，对可控通气真空预压工作机制进行研究，为可控通气真空预压的应用和发展提供理论依据。

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关键词 ：土力学, 吹填土, 真空预压, 可控通气, 模型试验, 沉降, 孔压

Abstract：With the development and construction of Binhai New Area，more and more lands are formed by the reclaimed soil with a water content of more than 80%. The vacuum preloading method is the conventional used method to improve the reclaimed soil. Therefore，how to reduce the cost for soil improvement has become an urgent problem to be solved. An improved vacuum preloading method in which the air is introduced at some stages during the period of vacuum preloading. The model test is designed and performed according to the concept of this method. A parallel model test with the conventional used vacuum preloading method is also carried out for comparison. During the tests，the settlement，pore pressure and vacuum pressure in the soil are obtained. The results show that the proposed method is more effective than the conventional vacuum preloading and it can reduce the reinforced time and is cost-effective. Finally，the mechanism of the proposed method is also studied.

Key words： soil mechanics reclaimed soil vacuum preloading controlled ventilation model test settlement pore pressure

收稿日期: 2010-03-04

引用本文:

朱平，孙立强，闫澍旺，纪玉诚. 可控通气真空预压室内模型试验及其机制分析[J]. 岩石力学与工程学报, 2011, 30(S1): 3141-3148.
ZHU Ping，SUN Liqiang，YAN Shuwang，JI Yucheng. MODEL TEST OF VACUUM PRELOADING WITH CONTROLLED VENTILATION AND ITS MECHANISM ANALYSIS. , 2011, 30(S1): 3141-3148.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS1/3141

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