黄土地层盾构隧道施工的掘进试验研究

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Abstract Loess is a typical structured soil，and its strength is closely related to the characteristics of soil structure. The stability of working face is significantly affected by the shield construction parameters in loess strata. Soils around the working face tend to become loose and even collapse if the earth pressure is not properly controlled，which would lead to problems of tunnel structure safety and surrounding environments. Focusing on Xi?an metro line 2(the first metro constructed in loess strata in China)，the paper carried out laboratory test to study ground disturbance induced by shield tunneling and the relationship of the shield construction key parameters in loess strata using the independently designed earth pressure balanced model shield machine. Also，the ground loss ratio K and width parameter of surface settlement trough i in loess strata are obtained. The results show that the shape of settlement curve in transverse section caused by shield tunneling in loess strata is different from that in cohesive soil，which shows the curve is deep V-shaped in lower part and palliative peviform in upper part. The development of surface settlement is mutable and three stages can be observed. The change of thrust force leads to the change in earth pressure directly，and the earth pressure and unearthed rate are somewhat randomly distributed. The unearthed rate has a decrease trend with the increase of thrust force，whilst there is an inversely-proportional relationship between advance speed and unearthed rate.

Key words： tunneling engineering shield tunnel loess strata soil disturbance construction parameters laboratory test

Received: 02 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I9/1736

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