土压平衡式盾构施工用泡沫混和土透水性试验研究  

Research on the permeability of the foamed-soil adopted in EPB shield tunneling

作　　者：魏康林[1] 

机构地区：[1]广州市地下铁道设计研究院,广州510010

出　　处：《现代隧道技术》2005年第5期17-21,共5页Modern Tunnelling Technology

摘　　要：文章从土力学角度研究了泡沫混和土这种多相介质的透水性,借助于改进的变水头试验方法,得出了泡沫掺入量、泡沫稳定性和土体性质对泡沫混和土透水性的影响规律。从进水量和出水量的变化,以及泡沫混和土的微观结构,分析了泡沫混和土透水性降低的机理。最后,对于泡沫掺入土体防治土压平衡式盾构施工中喷涌的效果作了简要的评价。The paper studies the permeability of the multi - phased foamed - soil from the point of view of soil mechanics. By means of the improved experiment approach by applying variable water pressure heads, some rules were revealed in the respect of the influence of the foam quantities added, the foam stability and the soil properties on the permeability of the foamed - soil. The mechanism of the reduced permeability is analyzed from the variation of the water inflow and discharge and the microstructure of the foamed - soil. In the end, the effect of the foam added in the soil to prevent the earth - pressure - balanced shield tunneling from outburst is evaluated concisely.

关 键 词：泡沫混和土 渗透系数 喷涌防治 

分 类 号：TU4[建筑科学—土工工程] U455.43[建筑科学—桥梁与隧道工程]