土压平衡盾构施工中泡沫和膨润土改良土体的微观机理分析

Micro-mechanism analysis for the soil improvement by foam and bentonite in EPB shield tunneling

由于缺乏外加剂和土体相互作用内在机理的研究,导致何种土体使用何种外加剂,如何调整比例,如何评价外加剂的使用效果等方面的研究相对滞后,在工程实践中往往依靠经验使用外加剂。作者通过三年的室内土体改良试验研究,提出了国内常用的两种外加剂和土体相互作用的内在机理,尤其对于盾构掘进中不同土质和土性应该使用何种类型的外加剂,文章基于微观试验给出了具有说服力的结论。

In order to improve the soils encountered in shield tunneling additives are applied according to experi- ence at present time. Through soil - improving research for three years, author of the paper revealed the interaction mechanism of the soil and two kinds of conventional additives. As for how to choose the additives in different soils in shield tunneling, this text gives persuasive conclusions according to the micro- experiment.