盾构施工对上部地层受荷变形影响试验研究

doi:10.3724/1000-6915.jrme.2024.0283

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Abstract In order to explore the mechanism of the influence of shield construction on the load deformation of the upper stratum，a model shield machine with a similarity ratio of 1∶10 was independently designed to simulate the shield construction. Only the influence of the shield excavation process on the load deformation of the upper soil was considered. At the same time，the settlement and soil pressure changes of the upper stratum were monitored and analyzed in real time. The results show that：(1) for the loose and weak stratum，the settlement of the upper stratum is not obvious in the initial stage of shield construction. With the increase of the excavation distance，the settlement of the soil gradually increases，and reaches the peak when the excavation exceeds about 0.7 times the excavation diameter of the corresponding section. (2) In the process of shield excavation，the soil pressure on the excavation face and on both sides shows a decreasing trend in a certain range. At the same depth，the soil pressure near the excavation face decreases more，and the soil pressure increases more in the later period. (3) There is an obvious soil arching phenomenon at the position of about 0.2 times the excavation diameter from the horizontal net distance of the excavation face，and the soil pressure increases obviously. (4) In the actual construction process，for the weak loose stratum，in order to reduce the formation loss，it is recommended to design the cutterhead diameter as the same as the shield shell diameter.

Key words： tunnelling engineering shield construction model test soil settlement formation deformation

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	Articles by authors
	HUANG Dawei
	LU Wenjian
	LUO Wenjun
	CHEN Kai
	CHEN Houhong

Cite this article:

HUANG Dawei,LU Wenjian,LUO Wenjun, et al. Experimental study on the influence of shield construction on the deformation of upper strata under load[J]. , 2025, 44(S1): 51-60.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0283 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/51

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