长期渗漏水条件下海陆相浅埋盾构隧道隧顶水土荷载计算

doi:10.13722/j.cnki.jrme.2020.1053

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Abstract The long-term water leakage of shield tunnels seriously affects the water and soil loads on the outside of the segments. Through theoretical analysis，the expression of the vertical average permeability gradient over the tunnel roof and the calculation formula of the lateral earth pressure coefficient considering the arching effect of maximum principal stress were obtained，and the calculation model of the water and soil load on the top of the tunnels considering the effect of long-term water leakage was further constructed. Relying on the geological conditions of two typical sections of the Hengqin tunnel，the theoretical analysis results were compared with the field measurement results of the water and soil load under different calculation conditions. The following conclusions are that the model in this paper can reasonably and effectively evaluate the water and soil pressure on the top of shield tunnels in marine and land sections and has the smallest error compared with the Dimitrios Kolymbas effective stress method and the Terzaghi total stress method. With increasing the friction angle，the lateral earth pressure coefficient shows a slight decrease first and then increase trend，indicating that the soil arching effect can play a leading role in the lateral earth pressure coefficient when certain conditions are reached. The water and soil load on the top of the tunnel presents a non-linear positive correlation with the buried depth ratio of the tunnel，a linear positive correlation with the soil gravity and the water head outside the segment，while a linear negative correlation with the leakage of a single width. Related research results can provide theoretical basis for the rational design of underwater shield tunnels.

Key words： tunnelling engineering shield tunnel in marine and terrestrial sections water leakage water and soil load soil arching effect lateral earth pressure coefficient

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	Articles by authors
	LIU Shiwei1
	2
	3
	ZHAO Shuzheng1
	2
	FU Di1
	2
	ZHAO Qiang4
	ZHU Zeqi3

Cite this article:

LIU Shiwei1,2,3, et al. Calculation of water and earth pressures on the top of shallow shield tunnels in marine and terrestrial sections under the condition of long-term water leakage[J]. , 2021, 40(10): 2149-2160.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1053 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2149

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