既有上部建筑荷载下盾构施工引起土体附加应力分析

doi:10.13722/j.cnki.jrme.2017.1660

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Abstract Considering the influence of the building load on the additional stress of the soil，the building load is changed into the covered soil with a certain thickness according to the effective gravity of the soil. In terms of the Mindlin solution of elastic mechanics，the analytical solution to the additional stress of the surrounding soil is given，which is caused by the front thrust of the cutter head as well as the frictional force between the shield and the soil under the load construction of the upper structure. Simultaneously，the analytical solution to the additional stress of the surrounding soil resulting from the friction force between the cutter and the soil is derived. Combined with specific calculation cases，the distribution of the additional stress of soil caused by the front thrust，shield shell friction and cutter friction force is analyzed，and the influence on the surrounding environment is also taken into account. Moreover，the effects of different superstructure loads on the additional stress and distribution law of the soil are analyzed，in which the additional stress is original from the front thrust of the cutter head and the friction force of the shield. The result shows that both the positive thrust and cutter friction between shields have an important impact on the additional stress of surrounding soil in the shield construction with superstructure loads. As the main influencing factors，they have certain degrees of diffusion，and in which the additional stress component along the propelled direction is more obvious. However，the friction force of the cutter disk has little influence on the additional stress of the surrounding soil but has a certain degree of fluctuation，and the additional stress has approximately an antisymmetric distribution on axis. Especially，the fluctuation of additional stress caused by the friction between the cutting tool and the soil body is particularly significant. Different building loads have obvious impacts on the amplitude and law of additional stress and which caused by shield friction，and the effect of is most significant. The above research is of fundamental significance to guide the design and construction of the shield tunnel.

Key words： soil mechanics Mindlin solution additional stress positive thrust friction

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	Articles by authors
	WU Chongfu1
	WEI Chao1
	QIAO Feifei2

Cite this article:

WU Chongfu1,WEI Chao1,QIAO Feifei2. Analysis of additional soil stress caused by shield construction under existing superstructure loads[J]. , 2018, 37(7): 1708-1721.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1660 OR http://www.rockmech.org/EN/Y2018/V37/I7/1708

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